The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/crypto/sha1.c

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    1 /*      $KAME: sha1.c,v 1.5 2000/11/08 06:13:08 itojun Exp $    */
    2 /*-
    3  * SPDX-License-Identifier: BSD-3-Clause
    4  *
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
   35  * based on: http://csrc.nist.gov/fips/fip180-1.txt
   36  * implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD$");
   41 
   42 #include <sys/types.h>
   43 #include <sys/cdefs.h>
   44 #include <sys/time.h>
   45 #include <sys/systm.h>
   46 
   47 #include <crypto/sha1.h>
   48 
   49 /* sanity check */
   50 #if BYTE_ORDER != BIG_ENDIAN
   51 # if BYTE_ORDER != LITTLE_ENDIAN
   52 #  define unsupported 1
   53 # endif
   54 #endif
   55 
   56 #ifndef unsupported
   57 
   58 /* constant table */
   59 static uint32_t _K[] = { 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 };
   60 #define K(t)    _K[(t) / 20]
   61 
   62 #define F0(b, c, d)     (((b) & (c)) | ((~(b)) & (d)))
   63 #define F1(b, c, d)     (((b) ^ (c)) ^ (d))
   64 #define F2(b, c, d)     (((b) & (c)) | ((b) & (d)) | ((c) & (d)))
   65 #define F3(b, c, d)     (((b) ^ (c)) ^ (d))
   66 
   67 #define S(n, x)         (((x) << (n)) | ((x) >> (32 - n)))
   68 
   69 #define H(n)    (ctxt->h.b32[(n)])
   70 #define COUNT   (ctxt->count)
   71 #define BCOUNT  (ctxt->c.b64[0] / 8)
   72 #define W(n)    (ctxt->m.b32[(n)])
   73 
   74 #define PUTBYTE(x)      { \
   75         ctxt->m.b8[(COUNT % 64)] = (x);         \
   76         COUNT++;                                \
   77         COUNT %= 64;                            \
   78         ctxt->c.b64[0] += 8;                    \
   79         if (COUNT % 64 == 0)                    \
   80                 sha1_step(ctxt);                \
   81      }
   82 
   83 #define PUTPAD(x)       { \
   84         ctxt->m.b8[(COUNT % 64)] = (x);         \
   85         COUNT++;                                \
   86         COUNT %= 64;                            \
   87         if (COUNT % 64 == 0)                    \
   88                 sha1_step(ctxt);                \
   89      }
   90 
   91 static void sha1_step(struct sha1_ctxt *);
   92 
   93 static void
   94 sha1_step(struct sha1_ctxt *ctxt)
   95 {
   96         uint32_t        a, b, c, d, e;
   97         size_t t, s;
   98         uint32_t        tmp;
   99 
  100 #if BYTE_ORDER == LITTLE_ENDIAN
  101         struct sha1_ctxt tctxt;
  102         bcopy(&ctxt->m.b8[0], &tctxt.m.b8[0], 64);
  103         ctxt->m.b8[0] = tctxt.m.b8[3]; ctxt->m.b8[1] = tctxt.m.b8[2];
  104         ctxt->m.b8[2] = tctxt.m.b8[1]; ctxt->m.b8[3] = tctxt.m.b8[0];
  105         ctxt->m.b8[4] = tctxt.m.b8[7]; ctxt->m.b8[5] = tctxt.m.b8[6];
  106         ctxt->m.b8[6] = tctxt.m.b8[5]; ctxt->m.b8[7] = tctxt.m.b8[4];
  107         ctxt->m.b8[8] = tctxt.m.b8[11]; ctxt->m.b8[9] = tctxt.m.b8[10];
  108         ctxt->m.b8[10] = tctxt.m.b8[9]; ctxt->m.b8[11] = tctxt.m.b8[8];
  109         ctxt->m.b8[12] = tctxt.m.b8[15]; ctxt->m.b8[13] = tctxt.m.b8[14];
  110         ctxt->m.b8[14] = tctxt.m.b8[13]; ctxt->m.b8[15] = tctxt.m.b8[12];
  111         ctxt->m.b8[16] = tctxt.m.b8[19]; ctxt->m.b8[17] = tctxt.m.b8[18];
  112         ctxt->m.b8[18] = tctxt.m.b8[17]; ctxt->m.b8[19] = tctxt.m.b8[16];
  113         ctxt->m.b8[20] = tctxt.m.b8[23]; ctxt->m.b8[21] = tctxt.m.b8[22];
  114         ctxt->m.b8[22] = tctxt.m.b8[21]; ctxt->m.b8[23] = tctxt.m.b8[20];
  115         ctxt->m.b8[24] = tctxt.m.b8[27]; ctxt->m.b8[25] = tctxt.m.b8[26];
  116         ctxt->m.b8[26] = tctxt.m.b8[25]; ctxt->m.b8[27] = tctxt.m.b8[24];
  117         ctxt->m.b8[28] = tctxt.m.b8[31]; ctxt->m.b8[29] = tctxt.m.b8[30];
  118         ctxt->m.b8[30] = tctxt.m.b8[29]; ctxt->m.b8[31] = tctxt.m.b8[28];
  119         ctxt->m.b8[32] = tctxt.m.b8[35]; ctxt->m.b8[33] = tctxt.m.b8[34];
  120         ctxt->m.b8[34] = tctxt.m.b8[33]; ctxt->m.b8[35] = tctxt.m.b8[32];
  121         ctxt->m.b8[36] = tctxt.m.b8[39]; ctxt->m.b8[37] = tctxt.m.b8[38];
  122         ctxt->m.b8[38] = tctxt.m.b8[37]; ctxt->m.b8[39] = tctxt.m.b8[36];
  123         ctxt->m.b8[40] = tctxt.m.b8[43]; ctxt->m.b8[41] = tctxt.m.b8[42];
  124         ctxt->m.b8[42] = tctxt.m.b8[41]; ctxt->m.b8[43] = tctxt.m.b8[40];
  125         ctxt->m.b8[44] = tctxt.m.b8[47]; ctxt->m.b8[45] = tctxt.m.b8[46];
  126         ctxt->m.b8[46] = tctxt.m.b8[45]; ctxt->m.b8[47] = tctxt.m.b8[44];
  127         ctxt->m.b8[48] = tctxt.m.b8[51]; ctxt->m.b8[49] = tctxt.m.b8[50];
  128         ctxt->m.b8[50] = tctxt.m.b8[49]; ctxt->m.b8[51] = tctxt.m.b8[48];
  129         ctxt->m.b8[52] = tctxt.m.b8[55]; ctxt->m.b8[53] = tctxt.m.b8[54];
  130         ctxt->m.b8[54] = tctxt.m.b8[53]; ctxt->m.b8[55] = tctxt.m.b8[52];
  131         ctxt->m.b8[56] = tctxt.m.b8[59]; ctxt->m.b8[57] = tctxt.m.b8[58];
  132         ctxt->m.b8[58] = tctxt.m.b8[57]; ctxt->m.b8[59] = tctxt.m.b8[56];
  133         ctxt->m.b8[60] = tctxt.m.b8[63]; ctxt->m.b8[61] = tctxt.m.b8[62];
  134         ctxt->m.b8[62] = tctxt.m.b8[61]; ctxt->m.b8[63] = tctxt.m.b8[60];
  135 #endif
  136 
  137         a = H(0); b = H(1); c = H(2); d = H(3); e = H(4);
  138 
  139         for (t = 0; t < 20; t++) {
  140                 s = t & 0x0f;
  141                 if (t >= 16) {
  142                         W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
  143                 }
  144                 tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
  145                 e = d; d = c; c = S(30, b); b = a; a = tmp;
  146         }
  147         for (t = 20; t < 40; t++) {
  148                 s = t & 0x0f;
  149                 W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
  150                 tmp = S(5, a) + F1(b, c, d) + e + W(s) + K(t);
  151                 e = d; d = c; c = S(30, b); b = a; a = tmp;
  152         }
  153         for (t = 40; t < 60; t++) {
  154                 s = t & 0x0f;
  155                 W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
  156                 tmp = S(5, a) + F2(b, c, d) + e + W(s) + K(t);
  157                 e = d; d = c; c = S(30, b); b = a; a = tmp;
  158         }
  159         for (t = 60; t < 80; t++) {
  160                 s = t & 0x0f;
  161                 W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
  162                 tmp = S(5, a) + F3(b, c, d) + e + W(s) + K(t);
  163                 e = d; d = c; c = S(30, b); b = a; a = tmp;
  164         }
  165 
  166         H(0) = H(0) + a;
  167         H(1) = H(1) + b;
  168         H(2) = H(2) + c;
  169         H(3) = H(3) + d;
  170         H(4) = H(4) + e;
  171 
  172         bzero(&ctxt->m.b8[0], 64);
  173 }
  174 
  175 /*------------------------------------------------------------*/
  176 
  177 void
  178 sha1_init(struct sha1_ctxt *ctxt)
  179 {
  180         bzero(ctxt, sizeof(struct sha1_ctxt));
  181         H(0) = 0x67452301;
  182         H(1) = 0xefcdab89;
  183         H(2) = 0x98badcfe;
  184         H(3) = 0x10325476;
  185         H(4) = 0xc3d2e1f0;
  186 }
  187 
  188 void
  189 sha1_pad(struct sha1_ctxt *ctxt)
  190 {
  191         size_t padlen;          /*pad length in bytes*/
  192         size_t padstart;
  193 
  194         PUTPAD(0x80);
  195 
  196         padstart = COUNT % 64;
  197         padlen = 64 - padstart;
  198         if (padlen < 8) {
  199                 bzero(&ctxt->m.b8[padstart], padlen);
  200                 COUNT += padlen;
  201                 COUNT %= 64;
  202                 sha1_step(ctxt);
  203                 padstart = COUNT % 64;  /* should be 0 */
  204                 padlen = 64 - padstart; /* should be 64 */
  205         }
  206         bzero(&ctxt->m.b8[padstart], padlen - 8);
  207         COUNT += (padlen - 8);
  208         COUNT %= 64;
  209 #if BYTE_ORDER == BIG_ENDIAN
  210         PUTPAD(ctxt->c.b8[0]); PUTPAD(ctxt->c.b8[1]);
  211         PUTPAD(ctxt->c.b8[2]); PUTPAD(ctxt->c.b8[3]);
  212         PUTPAD(ctxt->c.b8[4]); PUTPAD(ctxt->c.b8[5]);
  213         PUTPAD(ctxt->c.b8[6]); PUTPAD(ctxt->c.b8[7]);
  214 #else
  215         PUTPAD(ctxt->c.b8[7]); PUTPAD(ctxt->c.b8[6]);
  216         PUTPAD(ctxt->c.b8[5]); PUTPAD(ctxt->c.b8[4]);
  217         PUTPAD(ctxt->c.b8[3]); PUTPAD(ctxt->c.b8[2]);
  218         PUTPAD(ctxt->c.b8[1]); PUTPAD(ctxt->c.b8[0]);
  219 #endif
  220 }
  221 
  222 void
  223 sha1_loop(struct sha1_ctxt *ctxt, const uint8_t *input, size_t len)
  224 {
  225         size_t gaplen;
  226         size_t gapstart;
  227         size_t off;
  228         size_t copysiz;
  229 
  230         off = 0;
  231 
  232         while (off < len) {
  233                 gapstart = COUNT % 64;
  234                 gaplen = 64 - gapstart;
  235 
  236                 copysiz = (gaplen < len - off) ? gaplen : len - off;
  237                 bcopy(&input[off], &ctxt->m.b8[gapstart], copysiz);
  238                 COUNT += copysiz;
  239                 COUNT %= 64;
  240                 ctxt->c.b64[0] += copysiz * 8;
  241                 if (COUNT % 64 == 0)
  242                         sha1_step(ctxt);
  243                 off += copysiz;
  244         }
  245 }
  246 
  247 void
  248 sha1_result(struct sha1_ctxt *ctxt, char digest0[static SHA1_RESULTLEN])
  249 {
  250         uint8_t *digest;
  251 
  252         digest = (uint8_t *)digest0;
  253         sha1_pad(ctxt);
  254 #if BYTE_ORDER == BIG_ENDIAN
  255         bcopy(&ctxt->h.b8[0], digest, SHA1_RESULTLEN);
  256 #else
  257         digest[0] = ctxt->h.b8[3]; digest[1] = ctxt->h.b8[2];
  258         digest[2] = ctxt->h.b8[1]; digest[3] = ctxt->h.b8[0];
  259         digest[4] = ctxt->h.b8[7]; digest[5] = ctxt->h.b8[6];
  260         digest[6] = ctxt->h.b8[5]; digest[7] = ctxt->h.b8[4];
  261         digest[8] = ctxt->h.b8[11]; digest[9] = ctxt->h.b8[10];
  262         digest[10] = ctxt->h.b8[9]; digest[11] = ctxt->h.b8[8];
  263         digest[12] = ctxt->h.b8[15]; digest[13] = ctxt->h.b8[14];
  264         digest[14] = ctxt->h.b8[13]; digest[15] = ctxt->h.b8[12];
  265         digest[16] = ctxt->h.b8[19]; digest[17] = ctxt->h.b8[18];
  266         digest[18] = ctxt->h.b8[17]; digest[19] = ctxt->h.b8[16];
  267 #endif
  268 }
  269 
  270 #endif /*unsupported*/

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