frost/secp256k1-zkp
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Add secp256k1_tagged_sha256 as defined in BIP-340

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Gives users the ability to hash messages to 32 byte before they are signed while
allowing efficient domain separation through the tag.
This commit is contained in:
Jonas Nick
2021-01-15 20:58:01 +00:00
parent b6c0b72fb0
commit 5a8e4991ad
3 changed files with 71 additions and 0 deletions
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13
src/secp256k1.c
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@@ -790,6 +790,19 @@ int secp256k1_ec_pubkey_combine(const secp256k1_context* ctx, secp256k1_pubkey *
return 1;
}
int secp256k1_tagged_sha256(const secp256k1_context* ctx, unsigned char *hash32, const unsigned char *tag, size_t taglen, const unsigned char *msg, size_t msglen) {
secp256k1_sha256 sha;
VERIFY_CHECK(ctx != NULL);
ARG_CHECK(hash32 != NULL);
ARG_CHECK(tag != NULL);
ARG_CHECK(msg != NULL);
secp256k1_sha256_initialize_tagged(&sha, tag, taglen);
secp256k1_sha256_write(&sha, msg, msglen);
secp256k1_sha256_finalize(&sha, hash32);
return 1;
}
#ifdef ENABLE_MODULE_ECDH
# include "modules/ecdh/main_impl.h"
#endif