53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/*
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* Copyright (c) 2016 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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/* see bearssl_rsa.h */
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uint32_t
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br_rsa_ssl_decrypt(br_rsa_private core, const br_rsa_private_key *sk,
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unsigned char *data, size_t len)
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{
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uint32_t x;
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size_t u;
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/*
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* A first check on length. Since this test works only on the
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* buffer length, it needs not (and cannot) be constant-time.
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*/
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if (len < 59 || len != (sk->n_bitlen + 7) >> 3) {
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return 0;
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}
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x = core(data, sk);
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x &= EQ(data[0], 0x00);
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x &= EQ(data[1], 0x02);
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for (u = 2; u < (len - 49); u ++) {
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x &= NEQ(data[u], 0);
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}
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x &= EQ(data[len - 49], 0x00);
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memmove(data, data + len - 48, 48);
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return x;
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}
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