58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#ifdef LTC_MECC
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/**
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Sign a message digest (Ethereum format with recovery_id+27)
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@param in The message digest to sign
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@param inlen The length of the digest
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@param out [out] The destination for the signature
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@param outlen [in/out] The max size and resulting size of the signature
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@param prng An active PRNG state
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@param wprng The index of the PRNG you wish to use
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@param key A private ECC key
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@return CRYPT_OK if successful
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*/
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int ecc_sign_hash_eth27(const unsigned char *in, unsigned long inlen,
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unsigned char *out, unsigned long *outlen,
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prng_state *prng, int wprng, const ecc_key *key)
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{
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int err, recid;
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void *r, *s;
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unsigned long i;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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/* Only valid for secp256k1 - OID 1.3.132.0.10 */
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if (pk_oid_cmp_with_ulong("1.3.132.0.10", key->dp.oid, key->dp.oidlen) != CRYPT_OK) {
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return CRYPT_ERROR;
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}
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if (*outlen < 65) {
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*outlen = 65;
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return CRYPT_BUFFER_OVERFLOW;
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}
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if ((err = ltc_mp_init_multi(&r, &s, LTC_NULL)) != CRYPT_OK) return err;
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if ((err = ecc_sign_hash_internal(in, inlen, r, s, prng, wprng, &recid, key)) != CRYPT_OK) goto error;
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zeromem(out, 65);
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*outlen = 65;
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i = ltc_mp_unsigned_bin_size(r);
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if ((err = ltc_mp_to_unsigned_bin(r, out + 32 - i)) != CRYPT_OK) goto error;
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i = ltc_mp_unsigned_bin_size(s);
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if ((err = ltc_mp_to_unsigned_bin(s, out + 64 - i)) != CRYPT_OK) goto error;
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out[64] = (unsigned char)(recid + 27); /* Recovery ID is 27/28 for Ethereum */
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err = CRYPT_OK;
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error:
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ltc_mp_deinit_multi(r, s, LTC_NULL);
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return err;
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}
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#endif
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