diff options
Diffstat (limited to 'src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c')
| -rw-r--r-- | src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c | 75 |
1 files changed, 61 insertions, 14 deletions
diff --git a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c index 90829e052..9e2ac1287 100644 --- a/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c +++ b/src/libstrongswan/plugins/gcrypt/gcrypt_rsa_public_key.c @@ -1,6 +1,7 @@ /* + * Copyright (C) 2017 Tobias Brunner * Copyright (C) 2005-2009 Martin Willi - * Hochschule fuer Technik Rapperswil + * HSR Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -22,6 +23,7 @@ #include <asn1/asn1.h> #include <asn1/asn1_parser.h> #include <crypto/hashers/hasher.h> +#include <credentials/keys/signature_params.h> typedef struct private_gcrypt_rsa_public_key_t private_gcrypt_rsa_public_key_t; @@ -109,27 +111,48 @@ static bool verify_raw(private_gcrypt_rsa_public_key_t *this, } /** - * Verification of an EMSA PKCS1 signature described in PKCS#1 + * Verification of an EMSA PKCS1v1.5 / EMSA-PSS signature described in PKCS#1 */ static bool verify_pkcs1(private_gcrypt_rsa_public_key_t *this, - hash_algorithm_t algorithm, char *hash_name, + hash_algorithm_t algorithm, rsa_pss_params_t *pss, chunk_t data, chunk_t signature) { hasher_t *hasher; chunk_t hash; gcry_error_t err; gcry_sexp_t in, sig; + char *hash_name = enum_to_name(hash_algorithm_short_names, algorithm); hasher = lib->crypto->create_hasher(lib->crypto, algorithm); - if (!hasher || !hasher->allocate_hash(hasher, data, &hash)) + if (!hasher) { - DESTROY_IF(hasher); + DBG1(DBG_LIB, "hash algorithm %N not supported", + hash_algorithm_names, algorithm); + return FALSE; + } + if (!hasher->allocate_hash(hasher, data, &hash)) + { + hasher->destroy(hasher); return FALSE; } hasher->destroy(hasher); - err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(hash %s %b))", - hash_name, hash.len, hash.ptr); + if (pss) + { + u_int slen = hasher_hash_size(algorithm); + if (pss->salt_len > RSA_PSS_SALT_LEN_DEFAULT) + { + slen = pss->salt_len; + } + err = gcry_sexp_build(&in, NULL, + "(data(flags pss)(salt-length %u)(hash %s %b))", + slen, hash_name, hash.len, hash.ptr); + } + else + { + err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(hash %s %b))", + hash_name, hash.len, hash.ptr); + } chunk_free(&hash); if (err) { @@ -159,6 +182,26 @@ static bool verify_pkcs1(private_gcrypt_rsa_public_key_t *this, return TRUE; } +#if GCRYPT_VERSION_NUMBER >= 0x010700 +/** + * Verification of an EMSA-PSS signature described in PKCS#1 + */ +static bool verify_pss(private_gcrypt_rsa_public_key_t *this, + rsa_pss_params_t *params, chunk_t data, chunk_t sig) +{ + if (!params) + { + return FALSE; + } + if (params->mgf1_hash != params->hash) + { + DBG1(DBG_LIB, "unable to use a different MGF1 hash for RSA-PSS"); + return FALSE; + } + return verify_pkcs1(this, params->hash, params, data, sig); +} +#endif + METHOD(public_key_t, get_type, key_type_t, private_gcrypt_rsa_public_key_t *this) { @@ -167,24 +210,28 @@ METHOD(public_key_t, get_type, key_type_t, METHOD(public_key_t, verify, bool, private_gcrypt_rsa_public_key_t *this, signature_scheme_t scheme, - chunk_t data, chunk_t signature) + void *params, chunk_t data, chunk_t signature) { switch (scheme) { case SIGN_RSA_EMSA_PKCS1_NULL: return verify_raw(this, data, signature); case SIGN_RSA_EMSA_PKCS1_SHA2_224: - return verify_pkcs1(this, HASH_SHA224, "sha224", data, signature); + return verify_pkcs1(this, HASH_SHA224, NULL, data, signature); case SIGN_RSA_EMSA_PKCS1_SHA2_256: - return verify_pkcs1(this, HASH_SHA256, "sha256", data, signature); + return verify_pkcs1(this, HASH_SHA256, NULL, data, signature); case SIGN_RSA_EMSA_PKCS1_SHA2_384: - return verify_pkcs1(this, HASH_SHA384, "sha384", data, signature); + return verify_pkcs1(this, HASH_SHA384, NULL, data, signature); case SIGN_RSA_EMSA_PKCS1_SHA2_512: - return verify_pkcs1(this, HASH_SHA512, "sha512", data, signature); + return verify_pkcs1(this, HASH_SHA512, NULL, data, signature); case SIGN_RSA_EMSA_PKCS1_SHA1: - return verify_pkcs1(this, HASH_SHA1, "sha1", data, signature); + return verify_pkcs1(this, HASH_SHA1, NULL, data, signature); case SIGN_RSA_EMSA_PKCS1_MD5: - return verify_pkcs1(this, HASH_MD5, "md5", data, signature); + return verify_pkcs1(this, HASH_MD5, NULL, data, signature); +#if GCRYPT_VERSION_NUMBER >= 0x010700 + case SIGN_RSA_EMSA_PSS: + return verify_pss(this, params, data, signature); +#endif default: DBG1(DBG_LIB, "signature scheme %N not supported in RSA", signature_scheme_names, scheme); |