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secp256k1_nonce_function_bipschnorr

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jl777
2019-02-20 08:17:34 -11:00
parent fb69ddb0c6
commit 88d08c07fa
1 changed files with 21 additions and 0 deletions
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21
src/secp256k1/src/secp256k1.c
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@@ -340,6 +340,27 @@ static int nonce_function_rfc6979(unsigned char *nonce32, const unsigned char *m
return 1;
}
/* This nonce function is described in BIP-schnorr
* (https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki) */
static int secp256k1_nonce_function_bipschnorr(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter) {
secp256k1_sha256 sha;
(void) data;
(void) counter;
VERIFY_CHECK(counter == 0);
/* Hash x||msg as per the spec */
secp256k1_sha256_initialize(&sha);
secp256k1_sha256_write(&sha, key32, 32);
secp256k1_sha256_write(&sha, msg32, 32);
/* Hash in algorithm, which is not in the spec, but may be critical to
* users depending on it to avoid nonce reuse across algorithms. */
if (algo16 != NULL) {
secp256k1_sha256_write(&sha, algo16, 16);
}
secp256k1_sha256_finalize(&sha, nonce32);
return 1;
}
const secp256k1_nonce_function secp256k1_nonce_function_rfc6979 = nonce_function_rfc6979;
const secp256k1_nonce_function secp256k1_nonce_function_default = nonce_function_rfc6979;