Add standalone Schnorr signature verification and utility functions
This commit introduces a new file, `verify.go`, which implements the Schnorr signature verification logic, ensuring compliance with BIP-340. It includes utility functions for memory operations and big-endian read/write, enhancing the overall functionality of the Schnorr signature implementation. Additionally, a new test file, `verify_test.go`, is added to validate the correctness of the verification process against existing implementations, covering various scenarios including valid and invalid signatures. These additions improve the robustness and reliability of the Schnorr signature features in the library.
This commit is contained in:
940
verify.go
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940
verify.go
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package p256k1
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import (
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"unsafe"
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)
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// ============================================================================
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// UTILITY FUNCTIONS
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// ============================================================================
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// secp256k1_read_be32 reads a uint32_t in big endian
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func secp256k1_read_be32(p []byte) uint32 {
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if len(p) < 4 {
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panic("buffer too small")
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}
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return uint32(p[0])<<24 | uint32(p[1])<<16 | uint32(p[2])<<8 | uint32(p[3])
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}
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// secp256k1_write_be32 writes a uint32_t in big endian
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func secp256k1_write_be32(p []byte, x uint32) {
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if len(p) < 4 {
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panic("buffer too small")
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}
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p[3] = byte(x)
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p[2] = byte(x >> 8)
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p[1] = byte(x >> 16)
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p[0] = byte(x >> 24)
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}
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// secp256k1_read_be64 reads a uint64_t in big endian
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func secp256k1_read_be64(p []byte) uint64 {
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if len(p) < 8 {
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panic("buffer too small")
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}
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return uint64(p[0])<<56 | uint64(p[1])<<48 | uint64(p[2])<<40 | uint64(p[3])<<32 |
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uint64(p[4])<<24 | uint64(p[5])<<16 | uint64(p[6])<<8 | uint64(p[7])
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}
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// secp256k1_write_be64 writes a uint64_t in big endian
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func secp256k1_write_be64(p []byte, x uint64) {
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if len(p) < 8 {
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panic("buffer too small")
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}
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p[7] = byte(x)
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p[6] = byte(x >> 8)
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p[5] = byte(x >> 16)
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p[4] = byte(x >> 24)
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p[3] = byte(x >> 32)
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p[2] = byte(x >> 40)
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p[1] = byte(x >> 48)
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p[0] = byte(x >> 56)
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}
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// secp256k1_memczero zeroes memory if flag == 1. Flag must be 0 or 1. Constant time.
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func secp256k1_memczero(s []byte, flag int) {
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if flag == 0 {
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return
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}
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for i := range s {
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s[i] = 0
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}
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}
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// secp256k1_memzero_explicit zeroes memory to prevent leaking sensitive info. Won't be optimized out.
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func secp256k1_memzero_explicit(ptr unsafe.Pointer, len uintptr) {
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memclear(ptr, len)
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}
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// secp256k1_memclear_explicit cleanses memory to prevent leaking sensitive info. Won't be optimized out.
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func secp256k1_memclear_explicit(ptr unsafe.Pointer, len uintptr) {
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memclear(ptr, len)
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}
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// secp256k1_memcmp_var semantics like memcmp. Variable-time.
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func secp256k1_memcmp_var(s1, s2 []byte) int {
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n := len(s1)
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if len(s2) < n {
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n = len(s2)
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}
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for i := 0; i < n; i++ {
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diff := int(s1[i]) - int(s2[i])
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if diff != 0 {
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return diff
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}
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}
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return len(s1) - len(s2)
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}
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// ============================================================================
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// SHA256 IMPLEMENTATION
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// ============================================================================
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// secp256k1_sha256 represents a SHA-256 hash context
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type secp256k1_sha256 struct {
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s [8]uint32
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buf [64]byte
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bytes uint64
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}
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// secp256k1_sha256_initialize initializes a SHA-256 hash context
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func secp256k1_sha256_initialize(hash *secp256k1_sha256) {
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hash.s[0] = 0x6a09e667
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hash.s[1] = 0xbb67ae85
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hash.s[2] = 0x3c6ef372
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hash.s[3] = 0xa54ff53a
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hash.s[4] = 0x510e527f
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hash.s[5] = 0x9b05688c
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hash.s[6] = 0x1f83d9ab
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hash.s[7] = 0x5be0cd19
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hash.bytes = 0
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}
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// secp256k1_sha256_transform performs one SHA-256 transformation
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func secp256k1_sha256_transform(s *[8]uint32, buf []byte) {
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// Use standard library SHA256 for transformation
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// This is a simplified implementation - full implementation would include
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// the exact transformation from the C code
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hasher := NewSHA256()
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hasher.Write(buf)
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var tmp [32]byte
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hasher.Finalize(tmp[:])
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// Convert back to state format (simplified)
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for i := 0; i < 8; i++ {
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s[i] = secp256k1_read_be32(tmp[i*4:])
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}
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}
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// secp256k1_sha256_write writes data to the hash
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func secp256k1_sha256_write(hash *secp256k1_sha256, data []byte, len int) {
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// Simplified implementation using standard library
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// Full implementation would match C code exactly
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if len == 0 {
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return
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}
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bufsize := int(hash.bytes & 0x3F)
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hash.bytes += uint64(len)
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// Process full blocks
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i := 0
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for len >= 64-bufsize {
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chunkLen := 64 - bufsize
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copy(hash.buf[bufsize:], data[i:i+chunkLen])
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i += chunkLen
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len -= chunkLen
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secp256k1_sha256_transform(&hash.s, hash.buf[:])
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bufsize = 0
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}
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// Copy remaining data
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if len > 0 {
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copy(hash.buf[bufsize:], data[i:i+len])
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}
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}
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// secp256k1_sha256_finalize finalizes the hash
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func secp256k1_sha256_finalize(hash *secp256k1_sha256, out32 []byte) {
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if len(out32) < 32 {
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panic("output buffer too small")
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}
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// Use standard library for finalization
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hasher := NewSHA256()
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// Write all buffered data
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bufsize := int(hash.bytes & 0x3F)
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if bufsize > 0 {
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hasher.Write(hash.buf[:bufsize])
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}
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// Finalize
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hasher.Finalize(out32)
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// Clear hash state
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hash.bytes = 0
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for i := range hash.s {
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hash.s[i] = 0
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}
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}
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// secp256k1_sha256_initialize_tagged initializes SHA256 with tagged hash
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func secp256k1_sha256_initialize_tagged(hash *secp256k1_sha256, tag []byte, taglen int) {
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var buf [32]byte
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secp256k1_sha256_initialize(hash)
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secp256k1_sha256_write(hash, tag, taglen)
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secp256k1_sha256_finalize(hash, buf[:])
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secp256k1_sha256_initialize(hash)
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secp256k1_sha256_write(hash, buf[:], 32)
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secp256k1_sha256_write(hash, buf[:], 32)
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}
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// secp256k1_sha256_clear clears the hash context
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func secp256k1_sha256_clear(hash *secp256k1_sha256) {
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secp256k1_memclear_explicit(unsafe.Pointer(hash), unsafe.Sizeof(*hash))
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}
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// ============================================================================
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// SCALAR OPERATIONS
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// ============================================================================
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// secp256k1_scalar represents a scalar value
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type secp256k1_scalar struct {
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d [4]uint64
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}
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// secp256k1_scalar_check_overflow checks if scalar overflows
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func secp256k1_scalar_check_overflow(a *secp256k1_scalar) bool {
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yes := 0
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no := 0
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no |= boolToInt(a.d[3] < scalarN3)
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yes |= boolToInt(a.d[2] > scalarN2) & (^no)
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no |= boolToInt(a.d[2] < scalarN2)
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yes |= boolToInt(a.d[1] > scalarN1) & (^no)
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no |= boolToInt(a.d[1] < scalarN1)
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yes |= boolToInt(a.d[0] >= scalarN0) & (^no)
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return yes != 0
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}
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// secp256k1_scalar_reduce reduces scalar modulo order
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func secp256k1_scalar_reduce(r *secp256k1_scalar, overflow int) {
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if overflow < 0 || overflow > 1 {
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panic("overflow must be 0 or 1")
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}
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var s Scalar
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s.d = r.d
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s.reduce(overflow)
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r.d = s.d
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}
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// secp256k1_scalar_set_b32 sets scalar from 32 bytes
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func secp256k1_scalar_set_b32(r *secp256k1_scalar, b32 []byte, overflow *int) {
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var s Scalar
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over := s.setB32(b32)
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r.d = s.d
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if overflow != nil {
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*overflow = boolToInt(over)
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}
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}
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// secp256k1_scalar_get_b32 gets scalar to 32 bytes
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func secp256k1_scalar_get_b32(bin []byte, a *secp256k1_scalar) {
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var s Scalar
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s.d = a.d
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s.getB32(bin)
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}
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// secp256k1_scalar_is_zero checks if scalar is zero
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func secp256k1_scalar_is_zero(a *secp256k1_scalar) bool {
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return (a.d[0] | a.d[1] | a.d[2] | a.d[3]) == 0
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}
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// secp256k1_scalar_negate negates scalar
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func secp256k1_scalar_negate(r *secp256k1_scalar, a *secp256k1_scalar) {
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var s Scalar
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s.d = a.d
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var sa Scalar
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sa.d = a.d
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s.negate(&sa)
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r.d = s.d
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}
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// secp256k1_scalar_add adds two scalars
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func secp256k1_scalar_add(r *secp256k1_scalar, a *secp256k1_scalar, b *secp256k1_scalar) bool {
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var sa, sb Scalar
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sa.d = a.d
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sb.d = b.d
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var sr Scalar
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overflow := sr.add(&sa, &sb)
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r.d = sr.d
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return overflow
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}
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// secp256k1_scalar_mul multiplies two scalars
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func secp256k1_scalar_mul(r *secp256k1_scalar, a *secp256k1_scalar, b *secp256k1_scalar) {
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var sa, sb Scalar
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sa.d = a.d
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sb.d = b.d
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var sr Scalar
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sr.mul(&sa, &sb)
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r.d = sr.d
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}
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// secp256k1_scalar_clear clears scalar
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func secp256k1_scalar_clear(r *secp256k1_scalar) {
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secp256k1_memclear_explicit(unsafe.Pointer(r), unsafe.Sizeof(*r))
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}
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// secp256k1_scalar_set_b32_seckey sets scalar from seckey
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func secp256k1_scalar_set_b32_seckey(r *secp256k1_scalar, bin []byte) bool {
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var s Scalar
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ret := s.setB32Seckey(bin)
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r.d = s.d
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return ret
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}
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// secp256k1_scalar_cmov conditionally moves scalar
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func secp256k1_scalar_cmov(r *secp256k1_scalar, a *secp256k1_scalar, flag int) {
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var sr, sa Scalar
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sr.d = r.d
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sa.d = a.d
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sr.cmov(&sa, flag)
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r.d = sr.d
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}
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// secp256k1_scalar_get_bits_limb32 gets bits from scalar
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func secp256k1_scalar_get_bits_limb32(a *secp256k1_scalar, offset, count uint) uint32 {
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var s Scalar
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s.d = a.d
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return s.getBits(offset, count)
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}
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// secp256k1_scalar constants
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var (
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secp256k1_scalar_one = secp256k1_scalar{d: [4]uint64{1, 0, 0, 0}}
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secp256k1_scalar_zero = secp256k1_scalar{d: [4]uint64{0, 0, 0, 0}}
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)
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// ============================================================================
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// FIELD OPERATIONS
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// ============================================================================
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// secp256k1_fe represents a field element
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type secp256k1_fe struct {
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n [5]uint64
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}
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// secp256k1_fe_clear clears field element
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func secp256k1_fe_clear(a *secp256k1_fe) {
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secp256k1_memclear_explicit(unsafe.Pointer(a), unsafe.Sizeof(*a))
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}
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// secp256k1_fe_set_int sets field element to int
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func secp256k1_fe_set_int(r *secp256k1_fe, a int) {
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var fe FieldElement
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fe.setInt(a)
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r.n = fe.n
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}
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// secp256k1_fe_is_zero checks if field element is zero
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func secp256k1_fe_is_zero(a *secp256k1_fe) bool {
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return (a.n[0] | a.n[1] | a.n[2] | a.n[3] | a.n[4]) == 0
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}
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// secp256k1_fe_is_odd checks if field element is odd
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func secp256k1_fe_is_odd(a *secp256k1_fe) bool {
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return a.n[0]&1 == 1
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}
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// secp256k1_fe_normalize_var normalizes field element
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func secp256k1_fe_normalize_var(r *secp256k1_fe) {
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var fe FieldElement
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fe.n = r.n
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fe.normalize()
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r.n = fe.n
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}
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// secp256k1_fe_normalize_weak normalizes field element weakly
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func secp256k1_fe_normalize_weak(r *secp256k1_fe) {
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var fe FieldElement
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fe.n = r.n
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fe.normalizeWeak()
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r.n = fe.n
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}
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// secp256k1_fe_normalizes_to_zero checks if field element normalizes to zero
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func secp256k1_fe_normalizes_to_zero(r *secp256k1_fe) bool {
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var fe FieldElement
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fe.n = r.n
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return fe.normalizesToZeroVar()
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}
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// secp256k1_fe_negate negates field element
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func secp256k1_fe_negate(r *secp256k1_fe, a *secp256k1_fe, m int) {
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var fe FieldElement
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fe.n = a.n
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var fea FieldElement
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fea.n = a.n
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fe.negate(&fea, m)
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r.n = fe.n
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}
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// secp256k1_fe_add adds field element
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func secp256k1_fe_add(r *secp256k1_fe, a *secp256k1_fe) {
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var fe FieldElement
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fe.n = r.n
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var fea FieldElement
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fea.n = a.n
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fe.add(&fea)
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r.n = fe.n
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}
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// secp256k1_fe_add_int adds int to field element
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func secp256k1_fe_add_int(r *secp256k1_fe, a int) {
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var fe FieldElement
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fe.n = r.n
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fe.mulInt(a)
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r.n = fe.n
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}
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// secp256k1_fe_set_b32_mod sets field element from bytes mod
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func secp256k1_fe_set_b32_mod(r *secp256k1_fe, a []byte) {
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var fe FieldElement
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fe.setB32(a)
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r.n = fe.n
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}
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// secp256k1_fe_set_b32_limit sets field element from bytes limit
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func secp256k1_fe_set_b32_limit(r *secp256k1_fe, a []byte) bool {
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var fe FieldElement
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if err := fe.setB32(a); err != nil {
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return false
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}
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// Check if normalized value is within limit
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fe.normalize()
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r.n = fe.n
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// Check if r >= p (field modulus)
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// p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F
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// Check: r.n[4] == 0x0FFFFFFFFFFFF && r.n[3] == 0xFFFFFFFFFFFFF &&
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// r.n[2] == 0xFFFFFFFFFFFFF && r.n[1] == 0xFFFFFFFFFFFFF &&
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// r.n[0] >= 0xFFFFEFFFFFC2F
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limit := (r.n[4] == 0x0FFFFFFFFFFFF) &&
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((r.n[3] & r.n[2] & r.n[1]) == 0xFFFFFFFFFFFFF) &&
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(r.n[0] >= 0xFFFFEFFFFFC2F)
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return !limit
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}
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// secp256k1_fe_get_b32 gets field element to bytes
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func secp256k1_fe_get_b32(r []byte, a *secp256k1_fe) {
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var fe FieldElement
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fe.n = a.n
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fe.getB32(r)
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}
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// secp256k1_fe_equal checks if two field elements are equal
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func secp256k1_fe_equal(a *secp256k1_fe, b *secp256k1_fe) bool {
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var fea, feb FieldElement
|
||||
fea.n = a.n
|
||||
feb.n = b.n
|
||||
var na FieldElement
|
||||
na.negate(&fea, 1)
|
||||
na.add(&feb)
|
||||
return na.normalizesToZeroVar()
|
||||
}
|
||||
|
||||
// secp256k1_fe_sqrt computes square root
|
||||
func secp256k1_fe_sqrt(r *secp256k1_fe, a *secp256k1_fe) bool {
|
||||
var fea, fer FieldElement
|
||||
fea.n = a.n
|
||||
ret := fer.sqrt(&fea)
|
||||
r.n = fer.n
|
||||
return ret
|
||||
}
|
||||
|
||||
// secp256k1_fe_mul multiplies field elements
|
||||
func secp256k1_fe_mul(r *secp256k1_fe, a *secp256k1_fe, b *secp256k1_fe) {
|
||||
var fea, feb, fer FieldElement
|
||||
fea.n = a.n
|
||||
feb.n = b.n
|
||||
fer.mul(&fea, &feb)
|
||||
r.n = fer.n
|
||||
}
|
||||
|
||||
// secp256k1_fe_sqr squares field element
|
||||
func secp256k1_fe_sqr(r *secp256k1_fe, a *secp256k1_fe) {
|
||||
var fea, fer FieldElement
|
||||
fea.n = a.n
|
||||
fer.sqr(&fea)
|
||||
r.n = fer.n
|
||||
}
|
||||
|
||||
// secp256k1_fe_inv_var computes field element inverse
|
||||
func secp256k1_fe_inv_var(r *secp256k1_fe, x *secp256k1_fe) {
|
||||
var fex, fer FieldElement
|
||||
fex.n = x.n
|
||||
fer.inv(&fex)
|
||||
r.n = fer.n
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// GROUP OPERATIONS
|
||||
// ============================================================================
|
||||
|
||||
// secp256k1_ge represents a group element in affine coordinates
|
||||
type secp256k1_ge struct {
|
||||
x, y secp256k1_fe
|
||||
infinity int
|
||||
}
|
||||
|
||||
// secp256k1_gej represents a group element in Jacobian coordinates
|
||||
type secp256k1_gej struct {
|
||||
x, y, z secp256k1_fe
|
||||
infinity int
|
||||
}
|
||||
|
||||
// secp256k1_ge_set_infinity sets group element to infinity
|
||||
func secp256k1_ge_set_infinity(r *secp256k1_ge) {
|
||||
r.infinity = 1
|
||||
secp256k1_fe_set_int(&r.x, 0)
|
||||
secp256k1_fe_set_int(&r.y, 0)
|
||||
}
|
||||
|
||||
// secp256k1_ge_is_infinity checks if group element is infinity
|
||||
func secp256k1_ge_is_infinity(a *secp256k1_ge) bool {
|
||||
return a.infinity != 0
|
||||
}
|
||||
|
||||
// secp256k1_ge_set_xy sets group element from x, y
|
||||
func secp256k1_ge_set_xy(r *secp256k1_ge, x *secp256k1_fe, y *secp256k1_fe) {
|
||||
r.infinity = 0
|
||||
r.x = *x
|
||||
r.y = *y
|
||||
}
|
||||
|
||||
// secp256k1_ge_set_xo_var sets group element from x-only
|
||||
func secp256k1_ge_set_xo_var(r *secp256k1_ge, x *secp256k1_fe, odd int) bool {
|
||||
var fex FieldElement
|
||||
fex.n = x.n
|
||||
|
||||
var ge GroupElementAffine
|
||||
ret := ge.setXOVar(&fex, odd != 0)
|
||||
if ret {
|
||||
r.x.n = ge.x.n
|
||||
r.y.n = ge.y.n
|
||||
r.infinity = 0
|
||||
}
|
||||
return ret
|
||||
}
|
||||
|
||||
// secp256k1_gej_set_infinity sets Jacobian group element to infinity
|
||||
func secp256k1_gej_set_infinity(r *secp256k1_gej) {
|
||||
r.infinity = 1
|
||||
secp256k1_fe_set_int(&r.x, 0)
|
||||
secp256k1_fe_set_int(&r.y, 0)
|
||||
secp256k1_fe_set_int(&r.z, 0)
|
||||
}
|
||||
|
||||
// secp256k1_gej_is_infinity checks if Jacobian group element is infinity
|
||||
func secp256k1_gej_is_infinity(a *secp256k1_gej) bool {
|
||||
return a.infinity != 0
|
||||
}
|
||||
|
||||
// secp256k1_gej_set_ge sets Jacobian from affine
|
||||
func secp256k1_gej_set_ge(r *secp256k1_gej, a *secp256k1_ge) {
|
||||
r.infinity = a.infinity
|
||||
r.x = a.x
|
||||
r.y = a.y
|
||||
secp256k1_fe_set_int(&r.z, 1)
|
||||
}
|
||||
|
||||
// secp256k1_gej_clear clears Jacobian group element
|
||||
func secp256k1_gej_clear(r *secp256k1_gej) {
|
||||
secp256k1_memclear_explicit(unsafe.Pointer(r), unsafe.Sizeof(*r))
|
||||
}
|
||||
|
||||
// secp256k1_ge_set_gej sets affine from Jacobian
|
||||
func secp256k1_ge_set_gej(r *secp256k1_ge, a *secp256k1_gej) {
|
||||
var gej GroupElementJacobian
|
||||
gej.x.n = a.x.n
|
||||
gej.y.n = a.y.n
|
||||
gej.z.n = a.z.n
|
||||
gej.infinity = a.infinity != 0
|
||||
|
||||
var ge GroupElementAffine
|
||||
ge.setGEJ(&gej)
|
||||
|
||||
r.x.n = ge.x.n
|
||||
r.y.n = ge.y.n
|
||||
r.infinity = boolToInt(ge.infinity)
|
||||
}
|
||||
|
||||
// secp256k1_ge_set_gej_var sets affine from Jacobian (variable time)
|
||||
func secp256k1_ge_set_gej_var(r *secp256k1_ge, a *secp256k1_gej) {
|
||||
if secp256k1_gej_is_infinity(a) {
|
||||
secp256k1_ge_set_infinity(r)
|
||||
return
|
||||
}
|
||||
|
||||
var gej GroupElementJacobian
|
||||
gej.x.n = a.x.n
|
||||
gej.y.n = a.y.n
|
||||
gej.z.n = a.z.n
|
||||
gej.infinity = false
|
||||
|
||||
var ge GroupElementAffine
|
||||
ge.setGEJ(&gej)
|
||||
|
||||
r.x.n = ge.x.n
|
||||
r.y.n = ge.y.n
|
||||
r.infinity = 0
|
||||
}
|
||||
|
||||
// secp256k1_gej_double_var doubles Jacobian point
|
||||
func secp256k1_gej_double_var(r *secp256k1_gej, a *secp256k1_gej, rzr *secp256k1_fe) {
|
||||
var geja, gejr GroupElementJacobian
|
||||
geja.x.n = a.x.n
|
||||
geja.y.n = a.y.n
|
||||
geja.z.n = a.z.n
|
||||
geja.infinity = a.infinity != 0
|
||||
|
||||
gejr.double(&geja)
|
||||
|
||||
r.x.n = gejr.x.n
|
||||
r.y.n = gejr.y.n
|
||||
r.z.n = gejr.z.n
|
||||
r.infinity = boolToInt(gejr.infinity)
|
||||
|
||||
if rzr != nil {
|
||||
// rzr = 2*a->y (from double logic)
|
||||
rzr.n = a.y.n
|
||||
secp256k1_fe_add(rzr, &a.y)
|
||||
}
|
||||
}
|
||||
|
||||
// secp256k1_gej_add_ge_var adds affine point to Jacobian point
|
||||
func secp256k1_gej_add_ge_var(r *secp256k1_gej, a *secp256k1_gej, b *secp256k1_ge, rzr *secp256k1_fe) {
|
||||
var geja GroupElementJacobian
|
||||
geja.x.n = a.x.n
|
||||
geja.y.n = a.y.n
|
||||
geja.z.n = a.z.n
|
||||
geja.infinity = a.infinity != 0
|
||||
|
||||
var geb GroupElementAffine
|
||||
geb.x.n = b.x.n
|
||||
geb.y.n = b.y.n
|
||||
geb.infinity = b.infinity != 0
|
||||
|
||||
var fezr *FieldElement
|
||||
if rzr != nil {
|
||||
var tmp FieldElement
|
||||
tmp.n = rzr.n
|
||||
fezr = &tmp
|
||||
}
|
||||
|
||||
var gejr GroupElementJacobian
|
||||
gejr.addGEWithZR(&geja, &geb, fezr)
|
||||
|
||||
r.x.n = gejr.x.n
|
||||
r.y.n = gejr.y.n
|
||||
r.z.n = gejr.z.n
|
||||
r.infinity = boolToInt(gejr.infinity)
|
||||
|
||||
if rzr != nil && fezr != nil {
|
||||
rzr.n = fezr.n
|
||||
}
|
||||
}
|
||||
|
||||
// secp256k1_gej_add_zinv_var adds affine point to Jacobian with z inverse
|
||||
func secp256k1_gej_add_zinv_var(r *secp256k1_gej, a *secp256k1_gej, b *secp256k1_ge, bzinv *secp256k1_fe) {
|
||||
// Simplified implementation - full implementation would use zinv optimization
|
||||
secp256k1_gej_add_ge_var(r, a, b, nil)
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// EC MULTIPLICATION OPERATIONS
|
||||
// ============================================================================
|
||||
|
||||
// secp256k1_ecmult_gen_context represents EC multiplication generator context
|
||||
type secp256k1_ecmult_gen_context struct {
|
||||
built int
|
||||
}
|
||||
|
||||
// secp256k1_ecmult_gen_context_is_built checks if context is built
|
||||
func secp256k1_ecmult_gen_context_is_built(ctx *secp256k1_ecmult_gen_context) bool {
|
||||
return ctx.built != 0
|
||||
}
|
||||
|
||||
// secp256k1_ecmult_gen computes generator multiplication
|
||||
func secp256k1_ecmult_gen(ctx *secp256k1_ecmult_gen_context, r *secp256k1_gej, gn *secp256k1_scalar) {
|
||||
var s Scalar
|
||||
s.d = gn.d
|
||||
|
||||
var gejr GroupElementJacobian
|
||||
EcmultGen(&gejr, &s)
|
||||
|
||||
r.x.n = gejr.x.n
|
||||
r.y.n = gejr.y.n
|
||||
r.z.n = gejr.z.n
|
||||
r.infinity = boolToInt(gejr.infinity)
|
||||
}
|
||||
|
||||
// secp256k1_ecmult computes EC multiplication
|
||||
func secp256k1_ecmult(r *secp256k1_gej, a *secp256k1_gej, na *secp256k1_scalar, ng *secp256k1_scalar) {
|
||||
// r = na * a + ng * G
|
||||
// First compute na * a
|
||||
var geja GroupElementJacobian
|
||||
geja.x.n = a.x.n
|
||||
geja.y.n = a.y.n
|
||||
geja.z.n = a.z.n
|
||||
geja.infinity = a.infinity != 0
|
||||
|
||||
var sna Scalar
|
||||
sna.d = na.d
|
||||
|
||||
var naa GroupElementJacobian
|
||||
Ecmult(&naa, &geja, &sna)
|
||||
|
||||
// Then compute ng * G
|
||||
var sng Scalar
|
||||
sng.d = ng.d
|
||||
|
||||
var ngg GroupElementJacobian
|
||||
EcmultGen(&ngg, &sng)
|
||||
|
||||
// Add them together
|
||||
var gejr GroupElementJacobian
|
||||
gejr.addVar(&naa, &ngg)
|
||||
|
||||
r.x.n = gejr.x.n
|
||||
r.y.n = gejr.y.n
|
||||
r.z.n = gejr.z.n
|
||||
r.infinity = boolToInt(gejr.infinity)
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// PUBKEY/KEYPAIR OPERATIONS
|
||||
// ============================================================================
|
||||
|
||||
// secp256k1_context represents a context
|
||||
type secp256k1_context struct {
|
||||
ecmult_gen_ctx secp256k1_ecmult_gen_context
|
||||
declassify int
|
||||
}
|
||||
|
||||
// secp256k1_declassify declassifies data (no-op in non-VERIFY builds)
|
||||
func secp256k1_declassify(ctx *secp256k1_context, p unsafe.Pointer, len uintptr) {
|
||||
// No-op
|
||||
}
|
||||
|
||||
// secp256k1_pubkey represents a public key
|
||||
type secp256k1_pubkey struct {
|
||||
data [64]byte
|
||||
}
|
||||
|
||||
// secp256k1_xonly_pubkey represents an x-only public key
|
||||
type secp256k1_xonly_pubkey struct {
|
||||
data [32]byte
|
||||
}
|
||||
|
||||
// secp256k1_keypair represents a keypair
|
||||
type secp256k1_keypair struct {
|
||||
data [96]byte
|
||||
}
|
||||
|
||||
// secp256k1_pubkey_load loads public key
|
||||
func secp256k1_pubkey_load(ctx *secp256k1_context, ge *secp256k1_ge, pubkey *secp256k1_pubkey) bool {
|
||||
var pub PublicKey
|
||||
copy(pub.data[:], pubkey.data[:])
|
||||
|
||||
var gep GroupElementAffine
|
||||
gep.fromBytes(pub.data[:])
|
||||
|
||||
if gep.isInfinity() {
|
||||
return false
|
||||
}
|
||||
|
||||
ge.x.n = gep.x.n
|
||||
ge.y.n = gep.y.n
|
||||
ge.infinity = boolToInt(gep.infinity)
|
||||
|
||||
var fex FieldElement
|
||||
fex.n = ge.x.n
|
||||
fex.normalize()
|
||||
return !fex.isZero()
|
||||
}
|
||||
|
||||
// secp256k1_pubkey_save saves public key
|
||||
func secp256k1_pubkey_save(pubkey *secp256k1_pubkey, ge *secp256k1_ge) {
|
||||
var gep GroupElementAffine
|
||||
gep.x.n = ge.x.n
|
||||
gep.y.n = ge.y.n
|
||||
gep.infinity = ge.infinity != 0
|
||||
|
||||
var pub PublicKey
|
||||
gep.toBytes(pub.data[:])
|
||||
copy(pubkey.data[:], pub.data[:])
|
||||
}
|
||||
|
||||
// secp256k1_xonly_pubkey_load loads x-only public key
|
||||
func secp256k1_xonly_pubkey_load(ctx *secp256k1_context, ge *secp256k1_ge, pubkey *secp256k1_xonly_pubkey) bool {
|
||||
// Reconstruct point from X coordinate (x-only pubkey only has X)
|
||||
var x FieldElement
|
||||
if err := x.setB32(pubkey.data[:]); err != nil {
|
||||
return false
|
||||
}
|
||||
|
||||
// Try to recover Y coordinate (use even Y for BIP-340)
|
||||
var gep GroupElementAffine
|
||||
if !gep.setXOVar(&x, false) {
|
||||
return false
|
||||
}
|
||||
|
||||
ge.x.n = gep.x.n
|
||||
ge.y.n = gep.y.n
|
||||
ge.infinity = boolToInt(gep.infinity)
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// secp256k1_keypair_load loads keypair
|
||||
func secp256k1_keypair_load(ctx *secp256k1_context, sk *secp256k1_scalar, pk *secp256k1_ge, keypair *secp256k1_keypair) bool {
|
||||
var pubkey secp256k1_pubkey
|
||||
copy(pubkey.data[:], keypair.data[32:])
|
||||
|
||||
secp256k1_declassify(ctx, unsafe.Pointer(&pubkey.data[0]), 64)
|
||||
|
||||
ret := secp256k1_pubkey_load(ctx, pk, &pubkey)
|
||||
if sk != nil {
|
||||
var s Scalar
|
||||
ret = ret && s.setB32Seckey(keypair.data[:32])
|
||||
if ret {
|
||||
sk.d = s.d
|
||||
}
|
||||
}
|
||||
|
||||
if !ret {
|
||||
// Set to default values
|
||||
if pk != nil {
|
||||
secp256k1_ge_set_infinity(pk)
|
||||
}
|
||||
if sk != nil {
|
||||
*sk = secp256k1_scalar_one
|
||||
}
|
||||
}
|
||||
|
||||
return ret
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// SCHNORR SIGNATURE OPERATIONS
|
||||
// ============================================================================
|
||||
|
||||
// secp256k1_schnorrsig_sha256_tagged initializes SHA256 with tagged hash
|
||||
func secp256k1_schnorrsig_sha256_tagged(sha *secp256k1_sha256) {
|
||||
secp256k1_sha256_initialize(sha)
|
||||
sha.s[0] = 0x9cecba11
|
||||
sha.s[1] = 0x23925381
|
||||
sha.s[2] = 0x11679112
|
||||
sha.s[3] = 0xd1627e0f
|
||||
sha.s[4] = 0x97c87550
|
||||
sha.s[5] = 0x003cc765
|
||||
sha.s[6] = 0x90f61164
|
||||
sha.s[7] = 0x33e9b66a
|
||||
sha.bytes = 64
|
||||
}
|
||||
|
||||
// secp256k1_schnorrsig_challenge computes challenge hash
|
||||
func secp256k1_schnorrsig_challenge(e *secp256k1_scalar, r32 []byte, msg []byte, msglen int, pubkey32 []byte) {
|
||||
// Use TaggedHash for BIP-340 compatibility
|
||||
var challengeInput []byte
|
||||
challengeInput = append(challengeInput, r32[:32]...)
|
||||
challengeInput = append(challengeInput, pubkey32[:32]...)
|
||||
challengeInput = append(challengeInput, msg[:msglen]...)
|
||||
|
||||
challengeHash := TaggedHash(bip340ChallengeTag, challengeInput)
|
||||
|
||||
var s Scalar
|
||||
s.setB32(challengeHash[:])
|
||||
e.d = s.d
|
||||
}
|
||||
|
||||
// secp256k1_schnorrsig_verify verifies a Schnorr signature
|
||||
func secp256k1_schnorrsig_verify(ctx *secp256k1_context, sig64 []byte, msg []byte, msglen int, pubkey *secp256k1_xonly_pubkey) int {
|
||||
var s secp256k1_scalar
|
||||
var e secp256k1_scalar
|
||||
var rj secp256k1_gej
|
||||
var pk secp256k1_ge
|
||||
var pkj secp256k1_gej
|
||||
var rx secp256k1_fe
|
||||
var r secp256k1_ge
|
||||
var buf [32]byte
|
||||
var overflow int
|
||||
|
||||
if ctx == nil {
|
||||
return 0
|
||||
}
|
||||
if sig64 == nil {
|
||||
return 0
|
||||
}
|
||||
if msg == nil && msglen != 0 {
|
||||
return 0
|
||||
}
|
||||
if pubkey == nil {
|
||||
return 0
|
||||
}
|
||||
|
||||
// Check signature length
|
||||
if len(sig64) < 64 {
|
||||
return 0
|
||||
}
|
||||
|
||||
if !secp256k1_fe_set_b32_limit(&rx, sig64[:32]) {
|
||||
return 0
|
||||
}
|
||||
|
||||
secp256k1_scalar_set_b32(&s, sig64[32:], &overflow)
|
||||
if overflow != 0 {
|
||||
return 0
|
||||
}
|
||||
|
||||
if !secp256k1_xonly_pubkey_load(ctx, &pk, pubkey) {
|
||||
return 0
|
||||
}
|
||||
|
||||
// Compute e
|
||||
secp256k1_fe_normalize_var(&pk.x)
|
||||
secp256k1_fe_get_b32(buf[:], &pk.x)
|
||||
secp256k1_schnorrsig_challenge(&e, sig64[:32], msg, msglen, buf[:])
|
||||
|
||||
// Compute rj = s*G + (-e)*pkj
|
||||
secp256k1_scalar_negate(&e, &e)
|
||||
secp256k1_gej_set_ge(&pkj, &pk)
|
||||
secp256k1_ecmult(&rj, &pkj, &e, &s)
|
||||
|
||||
secp256k1_ge_set_gej_var(&r, &rj)
|
||||
if secp256k1_ge_is_infinity(&r) {
|
||||
return 0
|
||||
}
|
||||
|
||||
secp256k1_fe_normalize_var(&r.y)
|
||||
if secp256k1_fe_is_odd(&r.y) {
|
||||
return 0
|
||||
}
|
||||
|
||||
secp256k1_fe_normalize_var(&r.x)
|
||||
secp256k1_fe_normalize_var(&rx)
|
||||
if !secp256k1_fe_equal(&rx, &r.x) {
|
||||
return 0
|
||||
}
|
||||
|
||||
return 1
|
||||
}
|
||||
370
verify_test.go
Normal file
370
verify_test.go
Normal file
@@ -0,0 +1,370 @@
|
||||
package p256k1
|
||||
|
||||
import (
|
||||
"testing"
|
||||
)
|
||||
|
||||
// TestSecp256k1SchnorrsigVerifyComparison tests that secp256k1_schnorrsig_verify
|
||||
// produces the same results as the existing SchnorrVerify function
|
||||
func TestSecp256k1SchnorrsigVerifyComparison(t *testing.T) {
|
||||
// Create a context (required by secp256k1_schnorrsig_verify)
|
||||
ctx := &secp256k1_context{
|
||||
ecmult_gen_ctx: secp256k1_ecmult_gen_context{built: 1},
|
||||
declassify: 0,
|
||||
}
|
||||
|
||||
// Test case 1: Valid signature
|
||||
t.Run("ValidSignature", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
// Create message
|
||||
msg := make([]byte, 32)
|
||||
for i := range msg {
|
||||
msg[i] = byte(i)
|
||||
}
|
||||
|
||||
// Sign
|
||||
var sig [64]byte
|
||||
if err := SchnorrSign(sig[:], msg, kp, nil); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Convert x-only pubkey to secp256k1_xonly_pubkey format
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
// Test existing implementation
|
||||
existingResult := SchnorrVerify(sig[:], msg, xonly)
|
||||
|
||||
// Test new implementation
|
||||
newResult := secp256k1_schnorrsig_verify(ctx, sig[:], msg, len(msg), &secp_xonly)
|
||||
|
||||
// Compare results
|
||||
if existingResult != (newResult != 0) {
|
||||
t.Errorf("results differ: existing=%v, new=%d", existingResult, newResult)
|
||||
}
|
||||
|
||||
if !existingResult {
|
||||
t.Error("signature verification failed (both implementations)")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 2: Invalid signature (wrong message)
|
||||
t.Run("InvalidSignature_WrongMessage", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
// Create message
|
||||
msg := make([]byte, 32)
|
||||
for i := range msg {
|
||||
msg[i] = byte(i)
|
||||
}
|
||||
|
||||
// Sign
|
||||
var sig [64]byte
|
||||
if err := SchnorrSign(sig[:], msg, kp, nil); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Create wrong message
|
||||
wrongMsg := make([]byte, 32)
|
||||
copy(wrongMsg, msg)
|
||||
wrongMsg[0] ^= 1
|
||||
|
||||
// Convert x-only pubkey to secp256k1_xonly_pubkey format
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
// Test existing implementation
|
||||
existingResult := SchnorrVerify(sig[:], wrongMsg, xonly)
|
||||
|
||||
// Test new implementation
|
||||
newResult := secp256k1_schnorrsig_verify(ctx, sig[:], wrongMsg, len(wrongMsg), &secp_xonly)
|
||||
|
||||
// Compare results
|
||||
if existingResult != (newResult != 0) {
|
||||
t.Errorf("results differ: existing=%v, new=%d", existingResult, newResult)
|
||||
}
|
||||
|
||||
if existingResult {
|
||||
t.Error("signature verification should fail with wrong message (both implementations)")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 3: Invalid signature (wrong signature)
|
||||
t.Run("InvalidSignature_WrongSignature", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
// Create message
|
||||
msg := make([]byte, 32)
|
||||
for i := range msg {
|
||||
msg[i] = byte(i)
|
||||
}
|
||||
|
||||
// Sign
|
||||
var sig [64]byte
|
||||
if err := SchnorrSign(sig[:], msg, kp, nil); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Create wrong signature
|
||||
wrongSig := make([]byte, 64)
|
||||
copy(wrongSig, sig[:])
|
||||
wrongSig[0] ^= 1
|
||||
|
||||
// Convert x-only pubkey to secp256k1_xonly_pubkey format
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
// Test existing implementation
|
||||
existingResult := SchnorrVerify(wrongSig, msg, xonly)
|
||||
|
||||
// Test new implementation
|
||||
newResult := secp256k1_schnorrsig_verify(ctx, wrongSig, msg, len(msg), &secp_xonly)
|
||||
|
||||
// Compare results
|
||||
if existingResult != (newResult != 0) {
|
||||
t.Errorf("results differ: existing=%v, new=%d", existingResult, newResult)
|
||||
}
|
||||
|
||||
if existingResult {
|
||||
t.Error("signature verification should fail with wrong signature (both implementations)")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 4: Invalid signature (wrong pubkey)
|
||||
t.Run("InvalidSignature_WrongPubkey", func(t *testing.T) {
|
||||
// Generate two keypairs
|
||||
kp1, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair 1: %v", err)
|
||||
}
|
||||
defer kp1.Clear()
|
||||
|
||||
kp2, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair 2: %v", err)
|
||||
}
|
||||
defer kp2.Clear()
|
||||
|
||||
// Get x-only pubkey for kp2 (we sign with kp1, verify with kp2)
|
||||
xonly2, err := kp2.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey 2: %v", err)
|
||||
}
|
||||
|
||||
// Create message
|
||||
msg := make([]byte, 32)
|
||||
for i := range msg {
|
||||
msg[i] = byte(i)
|
||||
}
|
||||
|
||||
// Sign with keypair 1
|
||||
var sig [64]byte
|
||||
if err := SchnorrSign(sig[:], msg, kp1, nil); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Convert x-only pubkey 2 to secp256k1_xonly_pubkey format
|
||||
var secp_xonly2 secp256k1_xonly_pubkey
|
||||
copy(secp_xonly2.data[:], xonly2.data[:])
|
||||
|
||||
// Test existing implementation (verify with wrong pubkey)
|
||||
existingResult := SchnorrVerify(sig[:], msg, xonly2)
|
||||
|
||||
// Test new implementation (verify with wrong pubkey)
|
||||
newResult := secp256k1_schnorrsig_verify(ctx, sig[:], msg, len(msg), &secp_xonly2)
|
||||
|
||||
// Compare results
|
||||
if existingResult != (newResult != 0) {
|
||||
t.Errorf("results differ: existing=%v, new=%d", existingResult, newResult)
|
||||
}
|
||||
|
||||
if existingResult {
|
||||
t.Error("signature verification should fail with wrong pubkey (both implementations)")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 5: Edge cases - nil/invalid inputs
|
||||
t.Run("EdgeCases", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
msg := make([]byte, 32)
|
||||
var sig [64]byte
|
||||
|
||||
// Test with nil context
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
newResult := secp256k1_schnorrsig_verify(nil, sig[:], msg, len(msg), &secp_xonly)
|
||||
if newResult != 0 {
|
||||
t.Error("should return 0 with nil context")
|
||||
}
|
||||
|
||||
// Test with nil signature
|
||||
newResult = secp256k1_schnorrsig_verify(ctx, nil, msg, len(msg), &secp_xonly)
|
||||
if newResult != 0 {
|
||||
t.Error("should return 0 with nil signature")
|
||||
}
|
||||
|
||||
// Test with nil pubkey
|
||||
newResult = secp256k1_schnorrsig_verify(ctx, sig[:], msg, len(msg), nil)
|
||||
if newResult != 0 {
|
||||
t.Error("should return 0 with nil pubkey")
|
||||
}
|
||||
|
||||
// Test with invalid signature length
|
||||
if SchnorrVerify([]byte{1}, msg, xonly) {
|
||||
t.Error("existing: should fail with invalid signature length")
|
||||
}
|
||||
newResult = secp256k1_schnorrsig_verify(ctx, []byte{1}, msg, len(msg), &secp_xonly)
|
||||
if newResult != 0 {
|
||||
t.Error("new: should return 0 with invalid signature length")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 6: Multiple signatures with different aux_rand
|
||||
t.Run("MultipleSignatures_DifferentAuxRand", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
msg := make([]byte, 32)
|
||||
|
||||
// Sign with different aux_rand values
|
||||
auxRand1 := make([]byte, 32)
|
||||
auxRand2 := make([]byte, 32)
|
||||
for i := range auxRand1 {
|
||||
auxRand1[i] = byte(i)
|
||||
auxRand2[i] = byte(i + 1)
|
||||
}
|
||||
|
||||
var sig1, sig2 [64]byte
|
||||
if err := SchnorrSign(sig1[:], msg, kp, auxRand1); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
if err := SchnorrSign(sig2[:], msg, kp, auxRand2); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Convert x-only pubkey to secp256k1_xonly_pubkey format
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
// Test both signatures with existing implementation
|
||||
existingResult1 := SchnorrVerify(sig1[:], msg, xonly)
|
||||
existingResult2 := SchnorrVerify(sig2[:], msg, xonly)
|
||||
|
||||
// Test both signatures with new implementation
|
||||
newResult1 := secp256k1_schnorrsig_verify(ctx, sig1[:], msg, len(msg), &secp_xonly)
|
||||
newResult2 := secp256k1_schnorrsig_verify(ctx, sig2[:], msg, len(msg), &secp_xonly)
|
||||
|
||||
// Compare results
|
||||
if existingResult1 != (newResult1 != 0) {
|
||||
t.Errorf("signature 1 results differ: existing=%v, new=%d", existingResult1, newResult1)
|
||||
}
|
||||
if existingResult2 != (newResult2 != 0) {
|
||||
t.Errorf("signature 2 results differ: existing=%v, new=%d", existingResult2, newResult2)
|
||||
}
|
||||
|
||||
if !existingResult1 || !existingResult2 {
|
||||
t.Error("both signatures should verify")
|
||||
}
|
||||
})
|
||||
|
||||
// Test case 7: Empty message
|
||||
t.Run("EmptyMessage", func(t *testing.T) {
|
||||
// Generate keypair
|
||||
kp, err := KeyPairGenerate()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to generate keypair: %v", err)
|
||||
}
|
||||
defer kp.Clear()
|
||||
|
||||
// Get x-only pubkey
|
||||
xonly, err := kp.XOnlyPubkey()
|
||||
if err != nil {
|
||||
t.Fatalf("failed to get x-only pubkey: %v", err)
|
||||
}
|
||||
|
||||
// Create 32-byte message (all zeros)
|
||||
msg := make([]byte, 32)
|
||||
|
||||
// Sign
|
||||
var sig [64]byte
|
||||
if err := SchnorrSign(sig[:], msg, kp, nil); err != nil {
|
||||
t.Fatalf("failed to sign: %v", err)
|
||||
}
|
||||
|
||||
// Convert x-only pubkey to secp256k1_xonly_pubkey format
|
||||
var secp_xonly secp256k1_xonly_pubkey
|
||||
copy(secp_xonly.data[:], xonly.data[:])
|
||||
|
||||
// Test existing implementation
|
||||
existingResult := SchnorrVerify(sig[:], msg, xonly)
|
||||
|
||||
// Test new implementation
|
||||
newResult := secp256k1_schnorrsig_verify(ctx, sig[:], msg, len(msg), &secp_xonly)
|
||||
|
||||
// Compare results
|
||||
if existingResult != (newResult != 0) {
|
||||
t.Errorf("results differ: existing=%v, new=%d", existingResult, newResult)
|
||||
}
|
||||
|
||||
if !existingResult {
|
||||
t.Error("signature verification failed for empty message")
|
||||
}
|
||||
})
|
||||
}
|
||||
Reference in New Issue
Block a user