_ Git - BearSSL/blob - src/hash/md5sha1.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include "inner.h"
  26
  27 /* see bearssl.h */
  28 void
  29 br_md5sha1_init(br_md5sha1_context *cc)
  30 {
  31         cc->vtable = &br_md5sha1_vtable;
  32         memcpy(cc->val_md5, br_md5_IV, sizeof cc->val_md5);
  33         memcpy(cc->val_sha1, br_sha1_IV, sizeof cc->val_sha1);
  34         cc->count = 0;
  35 }
  36
  37 /* see bearssl.h */
  38 void
  39 br_md5sha1_update(br_md5sha1_context *cc, const void *data, size_t len)
  40 {
  41         const unsigned char *buf;
  42         size_t ptr;
  43
  44         buf = data;
  45         ptr = (size_t)cc->count & 63;
  46         while (len > 0) {
  47                 size_t clen;
  48
  49                 clen = 64 - ptr;
  50                 if (clen > len) {
  51                         clen = len;
  52                 }
  53                 memcpy(cc->buf + ptr, buf, clen);
  54                 ptr += clen;
  55                 buf += clen;
  56                 len -= clen;
  57                 cc->count += (uint64_t)clen;
  58                 if (ptr == 64) {
  59                         br_md5_round(cc->buf, cc->val_md5);
  60                         br_sha1_round(cc->buf, cc->val_sha1);
  61                         ptr = 0;
  62                 }
  63         }
  64 }
  65
  66 /* see bearssl.h */
  67 void
  68 br_md5sha1_out(const br_md5sha1_context *cc, void *dst)
  69 {
  70         unsigned char buf[64];
  71         uint32_t val_md5[4];
  72         uint32_t val_sha1[5];
  73         size_t ptr;
  74         unsigned char *out;
  75         uint64_t count;
  76
  77         count = cc->count;
  78         ptr = (size_t)count & 63;
  79         memcpy(buf, cc->buf, ptr);
  80         memcpy(val_md5, cc->val_md5, sizeof val_md5);
  81         memcpy(val_sha1, cc->val_sha1, sizeof val_sha1);
  82         buf[ptr ++] = 0x80;
  83         if (ptr > 56) {
  84                 memset(buf + ptr, 0, 64 - ptr);
  85                 br_md5_round(buf, val_md5);
  86                 br_sha1_round(buf, val_sha1);
  87                 memset(buf, 0, 56);
  88         } else {
  89                 memset(buf + ptr, 0, 56 - ptr);
  90         }
  91         count <<= 3;
  92         br_enc64le(buf + 56, count);
  93         br_md5_round(buf, val_md5);
  94         br_enc64be(buf + 56, count);
  95         br_sha1_round(buf, val_sha1);
  96         out = dst;
  97         br_range_enc32le(out, val_md5, 4);
  98         br_range_enc32be(out + 16, val_sha1, 5);
  99 }
 100
 101 /* see bearssl.h */
 102 uint64_t
 103 br_md5sha1_state(const br_md5sha1_context *cc, void *dst)
 104 {
 105         unsigned char *out;
 106
 107         out = dst;
 108         br_range_enc32le(out, cc->val_md5, 4);
 109         br_range_enc32be(out + 16, cc->val_sha1, 5);
 110         return cc->count;
 111 }
 112
 113 /* see bearssl.h */
 114 void
 115 br_md5sha1_set_state(br_md5sha1_context *cc, const void *stb, uint64_t count)
 116 {
 117         const unsigned char *buf;
 118
 119         buf = stb;
 120         br_range_dec32le(cc->val_md5, 4, buf);
 121         br_range_dec32be(cc->val_sha1, 5, buf + 16);
 122         cc->count = count;
 123 }
 124
 125 /* see bearssl.h */
 126 const br_hash_class br_md5sha1_vtable = {
 127         sizeof(br_md5sha1_context),
 128         BR_HASHDESC_ID(br_md5sha1_ID)
 129                 | BR_HASHDESC_OUT(36)
 130                 | BR_HASHDESC_STATE(36)
 131                 | BR_HASHDESC_LBLEN(6),
 132         (void (*)(const br_hash_class **))&br_md5sha1_init,
 133         (void (*)(const br_hash_class **, const void *, size_t))
 134                 &br_md5sha1_update,
 135         (void (*)(const br_hash_class *const *, void *))
 136                 &br_md5sha1_out,
 137         (uint64_t (*)(const br_hash_class *const *, void *))
 138                 &br_md5sha1_state,
 139         (void (*)(const br_hash_class **, const void *, uint64_t))
 140                 &br_md5sha1_set_state
 141 };