87 lines
1.8 KiB
Go
87 lines
1.8 KiB
Go
package main
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import (
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"crypto/rand"
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"crypto/sha256"
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"fmt"
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"log"
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secp "p8k.mleku.dev"
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)
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func main() {
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// Create a context for signing and verification
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ctx, err := secp.NewContext(secp.ContextSign | secp.ContextVerify)
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if err != nil {
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log.Fatal(err)
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}
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defer ctx.Destroy()
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// Generate a private key (32 random bytes)
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privKey := make([]byte, 32)
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if _, err := rand.Read(privKey); err != nil {
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log.Fatal(err)
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}
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// Create public key from private key
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pubKey, err := ctx.CreatePublicKey(privKey)
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if err != nil {
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log.Fatal(err)
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}
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// Serialize public key (compressed)
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pubKeyBytes, err := ctx.SerializePublicKey(pubKey, true)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Public key: %x\n", pubKeyBytes)
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// Sign a message
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message := []byte("Hello, libsecp256k1!")
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msgHash := sha256.Sum256(message)
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sig, err := ctx.Sign(msgHash[:], privKey)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Signature: %x\n", sig)
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// Verify the signature
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valid, err := ctx.Verify(msgHash[:], sig, pubKey)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Signature valid: %v\n", valid)
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// Test with serialized/parsed public key
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parsedPubKey, err := ctx.ParsePublicKey(pubKeyBytes)
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if err != nil {
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log.Fatal(err)
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}
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valid2, err := ctx.Verify(msgHash[:], sig, parsedPubKey)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Signature valid (parsed key): %v\n", valid2)
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// Test DER encoding
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derSig, err := ctx.SerializeSignatureDER(sig)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("DER signature: %x\n", derSig)
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// Parse DER signature
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parsedSig, err := ctx.ParseSignatureDER(derSig)
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if err != nil {
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log.Fatal(err)
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}
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valid3, err := ctx.Verify(msgHash[:], parsedSig, pubKey)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Signature valid (DER): %v\n", valid3)
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}
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