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57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* Copyright (c) 2018 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 inner.h */
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void
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br_mgf1_xor(void *data, size_t len,
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const br_hash_class *dig, const void *seed, size_t seed_len)
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{
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unsigned char *buf;
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size_t u, hlen;
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uint32_t c;
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buf = data;
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hlen = br_digest_size(dig);
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for (u = 0, c = 0; u < len; u += hlen, c ++) {
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br_hash_compat_context hc;
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unsigned char tmp[64];
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size_t v;
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hc.vtable = dig;
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dig->init(&hc.vtable);
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dig->update(&hc.vtable, seed, seed_len);
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br_enc32be(tmp, c);
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dig->update(&hc.vtable, tmp, 4);
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dig->out(&hc.vtable, tmp);
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for (v = 0; v < hlen; v ++) {
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if ((u + v) >= len) {
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break;
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}
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buf[u + v] ^= tmp[v];
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}
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}
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}
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