49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/*
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* Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "inner.h"
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#define FIELD_LEN ((BR_MAX_EC_SIZE + 7) >> 3)
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/* see bearssl_ec.h */
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uint32_t
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br_ecdsa_i15_vrfy_asn1(const br_ec_impl *impl,
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const void *hash, size_t hash_len,
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const br_ec_public_key *pk,
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const void *sig, size_t sig_len)
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{
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/*
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* We use a double-sized buffer because a malformed ASN.1 signature
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* may trigger a size expansion when converting to "raw" format.
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*/
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unsigned char rsig[(FIELD_LEN << 2) + 24];
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if (sig_len > ((sizeof rsig) >> 1)) {
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return 0;
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}
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memcpy(rsig, sig, sig_len);
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sig_len = br_ecdsa_asn1_to_raw(rsig, sig_len);
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return br_ecdsa_i15_vrfy_raw(impl, hash, hash_len, pk, rsig, sig_len);
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}
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