49 lines
1.7 KiB
C
49 lines
1.7 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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#if defined(LTC_MECC) && defined(LTC_SSH)
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/**
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Sign a message digest (RFC5656 / SSH 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_rfc5656(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;
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void *r, *s;
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char name[64];
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unsigned long namelen = sizeof(name);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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/* Get identifier string */
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if ((err = ecc_ssh_ecdsa_encode_name(name, &namelen, key)) != CRYPT_OK) return err;
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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, NULL, key)) != CRYPT_OK) goto error;
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/* Store as SSH data sequence, per RFC4251 */
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err = ssh_encode_sequence_multi(out, outlen,
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LTC_SSHDATA_STRING, name, namelen,
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LTC_SSHDATA_MPINT, r,
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LTC_SSHDATA_MPINT, s,
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LTC_SSHDATA_EOL, LTC_NULL);
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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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