379 lines
12 KiB
C
379 lines
12 KiB
C
/* signature.c
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*
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* Copyright (C) 2006-2017 wolfSSL Inc.
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*
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* This file is part of wolfSSL.
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*
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* wolfSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* wolfSSL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/signature.h>
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#include <wolfssl/wolfcrypt/error-crypt.h>
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#include <wolfssl/wolfcrypt/logging.h>
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#ifndef NO_ASN
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#include <wolfssl/wolfcrypt/asn.h>
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#endif
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#ifdef HAVE_ECC
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#include <wolfssl/wolfcrypt/ecc.h>
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#endif
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#ifndef NO_RSA
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#include <wolfssl/wolfcrypt/rsa.h>
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#endif
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/* If ECC and RSA are disabled then disable signature wrapper */
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#if (!defined(HAVE_ECC) || (defined(HAVE_ECC) && !defined(HAVE_ECC_SIGN) \
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&& !defined(HAVE_ECC_VERIFY))) && defined(NO_RSA)
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#undef NO_SIG_WRAPPER
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#define NO_SIG_WRAPPER
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#endif
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/* Signature wrapper disabled check */
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#ifndef NO_SIG_WRAPPER
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#if !defined(NO_RSA) && !defined(NO_ASN)
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static int wc_SignatureDerEncode(enum wc_HashType hash_type, byte** hash_data,
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word32* hash_len)
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{
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int ret = wc_HashGetOID(hash_type);
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if (ret > 0) {
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int oid = ret;
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/* Allocate buffer for hash and max DER encoded */
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word32 digest_len = *hash_len + MAX_DER_DIGEST_SZ;
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byte *digest_buf = (byte*)XMALLOC(digest_len, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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if (digest_buf) {
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ret = wc_EncodeSignature(digest_buf, *hash_data, *hash_len, oid);
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if (ret > 0) {
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digest_len = ret;
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/* Replace hash with digest (DER encoding + hash) */
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XFREE(*hash_data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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*hash_data = digest_buf;
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*hash_len = digest_len;
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}
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else {
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XFREE(digest_buf, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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}
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}
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else {
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ret = MEMORY_E;
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}
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}
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return ret;
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}
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#endif /* !NO_RSA && !NO_ASN */
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int wc_SignatureGetSize(enum wc_SignatureType sig_type,
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const void* key, word32 key_len)
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{
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int sig_len = BAD_FUNC_ARG;
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/* Suppress possible unused args if all signature types are disabled */
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(void)key;
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(void)key_len;
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switch(sig_type) {
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case WC_SIGNATURE_TYPE_ECC:
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#ifdef HAVE_ECC
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/* Santity check that void* key is at least ecc_key in size */
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if (key_len >= sizeof(ecc_key)) {
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sig_len = wc_ecc_sig_size((ecc_key*)key);
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}
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else {
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WOLFSSL_MSG("wc_SignatureGetSize: Invalid ECC key size");
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}
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#else
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sig_len = SIG_TYPE_E;
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#endif
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break;
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case WC_SIGNATURE_TYPE_RSA_W_ENC:
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case WC_SIGNATURE_TYPE_RSA:
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#ifndef NO_RSA
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/* Santity check that void* key is at least RsaKey in size */
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if (key_len >= sizeof(RsaKey)) {
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sig_len = wc_RsaEncryptSize((RsaKey*)key);
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}
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else {
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WOLFSSL_MSG("wc_SignatureGetSize: Invalid RsaKey key size");
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}
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#else
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sig_len = SIG_TYPE_E;
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#endif
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break;
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case WC_SIGNATURE_TYPE_NONE:
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default:
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sig_len = BAD_FUNC_ARG;
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break;
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}
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return sig_len;
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}
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int wc_SignatureVerify(
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enum wc_HashType hash_type, enum wc_SignatureType sig_type,
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const byte* data, word32 data_len,
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const byte* sig, word32 sig_len,
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const void* key, word32 key_len)
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{
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int ret;
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word32 hash_len;
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byte *hash_data = NULL;
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/* Check arguments */
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if (data == NULL || data_len <= 0 || sig == NULL || sig_len <= 0 ||
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key == NULL || key_len <= 0) {
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return BAD_FUNC_ARG;
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}
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/* Validate signature len (1 to max is okay) */
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if ((int)sig_len > wc_SignatureGetSize(sig_type, key, key_len)) {
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WOLFSSL_MSG("wc_SignatureVerify: Invalid sig type/len");
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return BAD_FUNC_ARG;
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}
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/* Validate hash size */
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ret = wc_HashGetDigestSize(hash_type);
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if (ret < 0) {
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WOLFSSL_MSG("wc_SignatureVerify: Invalid hash type/len");
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return ret;
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}
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hash_len = ret;
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/* Allocate temporary buffer for hash data */
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hash_data = (byte*)XMALLOC(hash_len, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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if (hash_data == NULL) {
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return MEMORY_E;
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}
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/* Perform hash of data */
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ret = wc_Hash(hash_type, data, data_len, hash_data, hash_len);
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if(ret == 0) {
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/* Verify signature using hash as data */
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switch(sig_type) {
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case WC_SIGNATURE_TYPE_ECC:
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{
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#if defined(HAVE_ECC) && defined(HAVE_ECC_VERIFY)
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int is_valid_sig = 0;
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/* Perform verification of signature using provided ECC key */
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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ret = wc_AsyncWait(ret, &((ecc_key*)key)->asyncDev,
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WC_ASYNC_FLAG_CALL_AGAIN);
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#endif
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if (ret >= 0)
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ret = wc_ecc_verify_hash(sig, sig_len, hash_data, hash_len,
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&is_valid_sig, (ecc_key*)key);
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} while (ret == WC_PENDING_E);
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if (ret != 0 || is_valid_sig != 1) {
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ret = SIG_VERIFY_E;
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}
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#else
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ret = SIG_TYPE_E;
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#endif
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break;
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}
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case WC_SIGNATURE_TYPE_RSA_W_ENC:
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#if defined(NO_RSA) || defined(NO_ASN)
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ret = SIG_TYPE_E;
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break;
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#else
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ret = wc_SignatureDerEncode(hash_type, &hash_data, &hash_len);
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/* Check for error */
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if (ret < 0) {
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break;
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}
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/* Otherwise fall-through and perform normal RSA verify against updated
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* DER encoding + hash */
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#endif
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FALL_THROUGH;
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case WC_SIGNATURE_TYPE_RSA:
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{
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#ifndef NO_RSA
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word32 plain_len = hash_len;
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byte *plain_data;
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/* Make sure the plain text output is at least key size */
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if (plain_len < sig_len) {
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plain_len = sig_len;
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}
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plain_data = (byte*)XMALLOC(plain_len, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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if (plain_data) {
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/* Perform verification of signature using provided RSA key */
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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ret = wc_AsyncWait(ret, &((RsaKey*)key)->asyncDev,
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WC_ASYNC_FLAG_CALL_AGAIN);
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#endif
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if (ret >= 0)
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ret = wc_RsaSSL_Verify(sig, sig_len, plain_data,
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plain_len, (RsaKey*)key);
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} while (ret == WC_PENDING_E);
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if (ret >= 0) {
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if ((word32)ret == hash_len &&
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XMEMCMP(plain_data, hash_data, hash_len) == 0) {
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ret = 0; /* Success */
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}
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else {
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WOLFSSL_MSG("RSA Signature Verify difference!");
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ret = SIG_VERIFY_E;
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}
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}
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XFREE(plain_data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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}
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else {
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ret = MEMORY_E;
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}
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#else
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ret = SIG_TYPE_E;
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#endif
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break;
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}
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case WC_SIGNATURE_TYPE_NONE:
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default:
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ret = BAD_FUNC_ARG;
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break;
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}
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}
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if (hash_data) {
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XFREE(hash_data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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}
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return ret;
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}
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int wc_SignatureGenerate(
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enum wc_HashType hash_type, enum wc_SignatureType sig_type,
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const byte* data, word32 data_len,
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byte* sig, word32 *sig_len,
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const void* key, word32 key_len, WC_RNG* rng)
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{
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int ret;
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word32 hash_len;
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byte *hash_data = NULL;
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/* Suppress possible unused arg if all signature types are disabled */
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(void)rng;
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/* Check arguments */
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if (data == NULL || data_len <= 0 || sig == NULL || sig_len == NULL ||
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*sig_len <= 0 || key == NULL || key_len <= 0) {
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return BAD_FUNC_ARG;
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}
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/* Validate signature len (needs to be at least max) */
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if ((int)*sig_len < wc_SignatureGetSize(sig_type, key, key_len)) {
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WOLFSSL_MSG("wc_SignatureGenerate: Invalid sig type/len");
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return BAD_FUNC_ARG;
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}
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/* Validate hash size */
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ret = wc_HashGetDigestSize(hash_type);
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if (ret < 0) {
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WOLFSSL_MSG("wc_SignatureGenerate: Invalid hash type/len");
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return ret;
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}
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hash_len = ret;
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/* Allocate temporary buffer for hash data */
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hash_data = (byte*)XMALLOC(hash_len, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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if (hash_data == NULL) {
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return MEMORY_E;
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}
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/* Perform hash of data */
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ret = wc_Hash(hash_type, data, data_len, hash_data, hash_len);
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if (ret == 0) {
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/* Create signature using hash as data */
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switch(sig_type) {
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case WC_SIGNATURE_TYPE_ECC:
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#if defined(HAVE_ECC) && defined(HAVE_ECC_SIGN)
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/* Create signature using provided ECC key */
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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ret = wc_AsyncWait(ret, &((ecc_key*)key)->asyncDev,
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WC_ASYNC_FLAG_CALL_AGAIN);
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#endif
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if (ret >= 0)
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ret = wc_ecc_sign_hash(hash_data, hash_len, sig, sig_len,
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rng, (ecc_key*)key);
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} while (ret == WC_PENDING_E);
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#else
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ret = SIG_TYPE_E;
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#endif
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break;
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case WC_SIGNATURE_TYPE_RSA_W_ENC:
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#if defined(NO_RSA) || defined(NO_ASN)
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ret = SIG_TYPE_E;
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break;
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#else
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ret = wc_SignatureDerEncode(hash_type, &hash_data, &hash_len);
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/* Check for error */
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if (ret < 0) {
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break;
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}
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/* Otherwise fall-through and perform normal RSA sign against updated
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* DER encoding + hash */
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#endif
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FALL_THROUGH;
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case WC_SIGNATURE_TYPE_RSA:
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#ifndef NO_RSA
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/* Create signature using provided RSA key */
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do {
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#ifdef WOLFSSL_ASYNC_CRYPT
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ret = wc_AsyncWait(ret, &((RsaKey*)key)->asyncDev,
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WC_ASYNC_FLAG_CALL_AGAIN);
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#endif
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if (ret >= 0)
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ret = wc_RsaSSL_Sign(hash_data, hash_len, sig, *sig_len,
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(RsaKey*)key, rng);
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} while (ret == WC_PENDING_E);
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if (ret >= 0) {
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*sig_len = ret;
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ret = 0; /* Success */
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}
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#else
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ret = SIG_TYPE_E;
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#endif
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break;
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case WC_SIGNATURE_TYPE_NONE:
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default:
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ret = BAD_FUNC_ARG;
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break;
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}
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}
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if (hash_data) {
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XFREE(hash_data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
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}
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return ret;
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}
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#endif /* NO_SIG_WRAPPER */
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