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Improve testrand: add extra random functions

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This commit adds functions:
* secp256k1_rand_bits, which works like secp256k1_rand32, but consumes
  less randomness
* secp256k1_rand_int, which produces a uniform integer over any range
* secp256k1_rand_bytes_test, which works like secp256k1_rand256_test
  but for arbitrary byte array
This commit is contained in:
Pieter Wuille
2015-10-17 20:56:53 +02:00
parent 31994c8e5b
commit 251b1a62d3
2 changed files with 57 additions and 18 deletions
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12
src/testrand.h
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@@ -16,13 +16,23 @@
/** Seed the pseudorandom number generator for testing. */
SECP256K1_INLINE static void secp256k1_rand_seed(const unsigned char *seed16);
/** Generate a pseudorandom 32-bit number. */
/** Generate a pseudorandom number in the range [0..2**32-1]. */
static uint32_t secp256k1_rand32(void);
/** Generate a pseudorandom number in the range [0..2**bits-1]. Bits must be 1 or
* more. */
static uint32_t secp256k1_rand_bits(int bits);
/** Generate a pseudorandom number in the range [0..range-1]. */
static uint32_t secp256k1_rand_int(uint32_t range);
/** Generate a pseudorandom 32-byte array. */
static void secp256k1_rand256(unsigned char *b32);
/** Generate a pseudorandom 32-byte array with long sequences of zero and one bits. */
static void secp256k1_rand256_test(unsigned char *b32);
/** Generate pseudorandom bytes with long sequences of zero and one bits. */
static void secp256k1_rand_bytes_test(unsigned char *bytes, size_t len);
#endif