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Diffstat (limited to 'rsa-pss-sha256-verify.c')
-rw-r--r-- | rsa-pss-sha256-verify.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/rsa-pss-sha256-verify.c b/rsa-pss-sha256-verify.c new file mode 100644 index 00000000..81bc4e68 --- /dev/null +++ b/rsa-pss-sha256-verify.c @@ -0,0 +1,60 @@ +/* rsa-pss-sha256-verify.c + + Verifying signatures created with RSA and SHA-256, with PSS padding. + + Copyright (C) 2017 Daiki Ueno + + This file is part of GNU Nettle. + + GNU Nettle is free software: you can redistribute it and/or + modify it under the terms of either: + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at your + option) any later version. + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at your + option) any later version. + + or both in parallel, as here. + + GNU Nettle is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see http://www.gnu.org/licenses/. +*/ + +#if HAVE_CONFIG_H +# include "config.h" +#endif + +#include "rsa.h" + +#include "bignum.h" +#include "pss.h" + +int +rsa_pss_sha256_verify_digest(const struct rsa_public_key *key, + size_t salt_length, + const uint8_t *digest, + const mpz_t signature) +{ + int res; + mpz_t m; + + mpz_init (m); + + res = (_rsa_verify_recover(key, m, signature) && + pss_verify_mgf1(m, mpz_sizeinbase(key->n, 2) - 1, &nettle_sha256, + salt_length, digest)); + + mpz_clear (m); + return res; +} |