74 lines
2.5 KiB
C
74 lines
2.5 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 (RFC7518 format + recovery_id)
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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 recid [out] Recovery ID
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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_rfc7518_ex(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,
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int *recid, const ecc_key *key)
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{
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int err;
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void *r, *s;
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unsigned long pbytes, 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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/* RFC7518 format - raw (r,s) */
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pbytes = ltc_mp_unsigned_bin_size(key->dp.order);
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if (*outlen < 2 * pbytes) {
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*outlen = 2 * pbytes;
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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, 2 * pbytes);
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*outlen = 2 * pbytes;
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i = ltc_mp_unsigned_bin_size(r);
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if ((err = ltc_mp_to_unsigned_bin(r, out + pbytes - i)) != CRYPT_OK) goto error;
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i = ltc_mp_unsigned_bin_size(s);
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err = ltc_mp_to_unsigned_bin(s, out + 2 * pbytes - i);
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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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/**
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Sign a message digest (RFC7518 format)
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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_rfc7518(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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return ecc_sign_hash_rfc7518_ex(in, inlen, out, outlen, prng, wprng, NULL, key);
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}
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#endif
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