| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| @file ed25519_verify.c |
| Verify an Ed25519 signature, Steffen Jaeckel |
| */ |
| |
| #ifdef LTC_CURVE25519 |
| |
| /** |
| Verify an Ed25519 signature. |
| @param private_key The private Ed25519 key in the pair |
| @param public_key The public Ed25519 key in the pair |
| @param out [out] The destination of the shared data |
| @param outlen [in/out] The max size and resulting size of the shared data. |
| @param stat [out] The result of the signature verification, 1==valid, 0==invalid |
| @return CRYPT_OK if successful |
| */ |
| int ed25519_verify(const unsigned char *msg, unsigned long msglen, |
| const unsigned char *sig, unsigned long siglen, |
| int *stat, const curve25519_key *public_key) |
| { |
| unsigned char* m; |
| unsigned long long mlen; |
| int err; |
| |
| LTC_ARGCHK(msg != NULL); |
| LTC_ARGCHK(sig != NULL); |
| LTC_ARGCHK(stat != NULL); |
| LTC_ARGCHK(public_key != NULL); |
| |
| *stat = 0; |
| |
| if (siglen != 64uL) return CRYPT_INVALID_ARG; |
| if (public_key->algo != PKA_ED25519) return CRYPT_PK_INVALID_TYPE; |
| |
| mlen = msglen + siglen; |
| if ((mlen < msglen) || (mlen < siglen)) return CRYPT_OVERFLOW; |
| |
| m = XMALLOC(mlen); |
| if (m == NULL) return CRYPT_MEM; |
| |
| XMEMCPY(m, sig, siglen); |
| XMEMCPY(m + siglen, msg, msglen); |
| |
| err = tweetnacl_crypto_sign_open(stat, |
| m, &mlen, |
| m, mlen, |
| public_key->pub); |
| |
| #ifdef LTC_CLEAN_STACK |
| zeromem(m, mlen); |
| #endif |
| XFREE(m); |
| |
| return err; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |