bsd/crypto/sha1.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the project nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 /*
  30  * FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
  31  * based on: http://csrc.nist.gov/fips/fip180-1.txt
  32  * implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/cdefs.h>
  37 #include <sys/time.h>
  38 #include <sys/systm.h>
  39
  40 #include <crypto/sha1.h>
  41
  42 /* sanity check */
  43 #if BYTE_ORDER != BIG_ENDIAN
  44 # if BYTE_ORDER != LITTLE_ENDIAN
  45 #  define unsupported 1
  46 # endif
  47 #endif
  48
  49 #ifndef unsupported
  50
  51 /* constant table */
  52 static u_int32_t _K[] = { 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 };
  53 #define K(t)    _K[(t) / 20]
  54
  55 #define F0(b, c, d)     (((b) & (c)) | ((~(b)) & (d)))
  56 #define F1(b, c, d)     (((b) ^ (c)) ^ (d))
  57 #define F2(b, c, d)     (((b) & (c)) | ((b) & (d)) | ((c) & (d)))
  58 #define F3(b, c, d)     (((b) ^ (c)) ^ (d))
  59
  60 #define S(n, x)         (((x) << (n)) | ((x) >> (32 - n)))
  61
  62 #define H(n)    (ctxt->h.b32[(n)])
  63 #define COUNT   (ctxt->count)
  64 #define BCOUNT  (ctxt->c.b64[0] / 8)
  65 #define W(n)    (ctxt->m.b32[(n)])
  66
  67 #define PUTBYTE(x)      { \
  68         ctxt->m.b8[(COUNT % 64)] = (x);         \
  69         COUNT++;                                \
  70         COUNT %= 64;                            \
  71         ctxt->c.b64[0] += 8;                    \
  72         if (COUNT % 64 == 0)                    \
  73                 sha1_step(ctxt);                \
  74      }
  75
  76 #define PUTPAD(x)       { \
  77         ctxt->m.b8[(COUNT % 64)] = (x);         \
  78         COUNT++;                                \
  79         COUNT %= 64;                            \
  80         if (COUNT % 64 == 0)                    \
  81                 sha1_step(ctxt);                \
  82      }
  83
  84 static void sha1_step __P((struct sha1_ctxt *));
  85
  86 static void
  87 sha1_step(ctxt)
  88         struct sha1_ctxt *ctxt;
  89 {
  90         u_int32_t       a, b, c, d, e;
  91         size_t t, s;
  92         u_int32_t       tmp;
  93
  94 #if BYTE_ORDER == LITTLE_ENDIAN
  95         struct sha1_ctxt tctxt;
  96         bcopy(&ctxt->m.b8[0], &tctxt.m.b8[0], 64);
  97         ctxt->m.b8[0] = tctxt.m.b8[3]; ctxt->m.b8[1] = tctxt.m.b8[2];
  98         ctxt->m.b8[2] = tctxt.m.b8[1]; ctxt->m.b8[3] = tctxt.m.b8[0];
  99         ctxt->m.b8[4] = tctxt.m.b8[7]; ctxt->m.b8[5] = tctxt.m.b8[6];
 100         ctxt->m.b8[6] = tctxt.m.b8[5]; ctxt->m.b8[7] = tctxt.m.b8[4];
 101         ctxt->m.b8[8] = tctxt.m.b8[11]; ctxt->m.b8[9] = tctxt.m.b8[10];
 102         ctxt->m.b8[10] = tctxt.m.b8[9]; ctxt->m.b8[11] = tctxt.m.b8[8];
 103         ctxt->m.b8[12] = tctxt.m.b8[15]; ctxt->m.b8[13] = tctxt.m.b8[14];
 104         ctxt->m.b8[14] = tctxt.m.b8[13]; ctxt->m.b8[15] = tctxt.m.b8[12];
 105         ctxt->m.b8[16] = tctxt.m.b8[19]; ctxt->m.b8[17] = tctxt.m.b8[18];
 106         ctxt->m.b8[18] = tctxt.m.b8[17]; ctxt->m.b8[19] = tctxt.m.b8[16];
 107         ctxt->m.b8[20] = tctxt.m.b8[23]; ctxt->m.b8[21] = tctxt.m.b8[22];
 108         ctxt->m.b8[22] = tctxt.m.b8[21]; ctxt->m.b8[23] = tctxt.m.b8[20];
 109         ctxt->m.b8[24] = tctxt.m.b8[27]; ctxt->m.b8[25] = tctxt.m.b8[26];
 110         ctxt->m.b8[26] = tctxt.m.b8[25]; ctxt->m.b8[27] = tctxt.m.b8[24];
 111         ctxt->m.b8[28] = tctxt.m.b8[31]; ctxt->m.b8[29] = tctxt.m.b8[30];
 112         ctxt->m.b8[30] = tctxt.m.b8[29]; ctxt->m.b8[31] = tctxt.m.b8[28];
 113         ctxt->m.b8[32] = tctxt.m.b8[35]; ctxt->m.b8[33] = tctxt.m.b8[34];
 114         ctxt->m.b8[34] = tctxt.m.b8[33]; ctxt->m.b8[35] = tctxt.m.b8[32];
 115         ctxt->m.b8[36] = tctxt.m.b8[39]; ctxt->m.b8[37] = tctxt.m.b8[38];
 116         ctxt->m.b8[38] = tctxt.m.b8[37]; ctxt->m.b8[39] = tctxt.m.b8[36];
 117         ctxt->m.b8[40] = tctxt.m.b8[43]; ctxt->m.b8[41] = tctxt.m.b8[42];
 118         ctxt->m.b8[42] = tctxt.m.b8[41]; ctxt->m.b8[43] = tctxt.m.b8[40];
 119         ctxt->m.b8[44] = tctxt.m.b8[47]; ctxt->m.b8[45] = tctxt.m.b8[46];
 120         ctxt->m.b8[46] = tctxt.m.b8[45]; ctxt->m.b8[47] = tctxt.m.b8[44];
 121         ctxt->m.b8[48] = tctxt.m.b8[51]; ctxt->m.b8[49] = tctxt.m.b8[50];
 122         ctxt->m.b8[50] = tctxt.m.b8[49]; ctxt->m.b8[51] = tctxt.m.b8[48];
 123         ctxt->m.b8[52] = tctxt.m.b8[55]; ctxt->m.b8[53] = tctxt.m.b8[54];
 124         ctxt->m.b8[54] = tctxt.m.b8[53]; ctxt->m.b8[55] = tctxt.m.b8[52];
 125         ctxt->m.b8[56] = tctxt.m.b8[59]; ctxt->m.b8[57] = tctxt.m.b8[58];
 126         ctxt->m.b8[58] = tctxt.m.b8[57]; ctxt->m.b8[59] = tctxt.m.b8[56];
 127         ctxt->m.b8[60] = tctxt.m.b8[63]; ctxt->m.b8[61] = tctxt.m.b8[62];
 128         ctxt->m.b8[62] = tctxt.m.b8[61]; ctxt->m.b8[63] = tctxt.m.b8[60];
 129 #endif
 130
 131         a = H(0); b = H(1); c = H(2); d = H(3); e = H(4);
 132
 133         for (t = 0; t < 20; t++) {
 134                 s = t & 0x0f;
 135                 if (t >= 16) {
 136                         W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
 137                 }
 138                 tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
 139                 e = d; d = c; c = S(30, b); b = a; a = tmp;
 140         }
 141         for (t = 20; t < 40; t++) {
 142                 s = t & 0x0f;
 143                 W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
 144                 tmp = S(5, a) + F1(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 = 40; t < 60; 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) + F2(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 = 60; t < 80; 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) + F3(b, c, d) + e + W(s) + K(t);
 157                 e = d; d = c; c = S(30, b); b = a; a = tmp;
 158         }
 159
 160         H(0) = H(0) + a;
 161         H(1) = H(1) + b;
 162         H(2) = H(2) + c;
 163         H(3) = H(3) + d;
 164         H(4) = H(4) + e;
 165
 166         bzero(&ctxt->m.b8[0], 64);
 167 }
 168
 169 /*------------------------------------------------------------*/
 170
 171 void
 172 sha1_init(ctxt)
 173         struct sha1_ctxt *ctxt;
 174 {
 175         bzero(ctxt, sizeof(struct sha1_ctxt));
 176         H(0) = 0x67452301;
 177         H(1) = 0xefcdab89;
 178         H(2) = 0x98badcfe;
 179         H(3) = 0x10325476;
 180         H(4) = 0xc3d2e1f0;
 181 }
 182
 183 void
 184 sha1_pad(ctxt)
 185         struct sha1_ctxt *ctxt;
 186 {
 187         size_t padlen;          /*pad length in bytes*/
 188         size_t padstart;
 189
 190         PUTPAD(0x80);
 191
 192         padstart = COUNT % 64;
 193         padlen = 64 - padstart;
 194         if (padlen < 8) {
 195                 bzero(&ctxt->m.b8[padstart], padlen);
 196                 COUNT += padlen;
 197                 COUNT %= 64;
 198                 sha1_step(ctxt);
 199                 padstart = COUNT % 64;  /* should be 0 */
 200                 padlen = 64 - padstart; /* should be 64 */
 201         }
 202         bzero(&ctxt->m.b8[padstart], padlen - 8);
 203         COUNT += (padlen - 8);
 204         COUNT %= 64;
 205 #if BYTE_ORDER == BIG_ENDIAN
 206         PUTPAD(ctxt->c.b8[0]); PUTPAD(ctxt->c.b8[1]);
 207         PUTPAD(ctxt->c.b8[2]); PUTPAD(ctxt->c.b8[3]);
 208         PUTPAD(ctxt->c.b8[4]); PUTPAD(ctxt->c.b8[5]);
 209         PUTPAD(ctxt->c.b8[6]); PUTPAD(ctxt->c.b8[7]);
 210 #else
 211         PUTPAD(ctxt->c.b8[7]); PUTPAD(ctxt->c.b8[6]);
 212         PUTPAD(ctxt->c.b8[5]); PUTPAD(ctxt->c.b8[4]);
 213         PUTPAD(ctxt->c.b8[3]); PUTPAD(ctxt->c.b8[2]);
 214         PUTPAD(ctxt->c.b8[1]); PUTPAD(ctxt->c.b8[0]);
 215 #endif
 216 }
 217
 218 void
 219 sha1_loop(ctxt, input0, len)
 220         struct sha1_ctxt *ctxt;
 221         const caddr_t input0;
 222         size_t len;
 223 {
 224         const u_int8_t *input;
 225         size_t gaplen;
 226         size_t gapstart;
 227         size_t off;
 228         size_t copysiz;
 229
 230         input = (const u_int8_t *)input0;
 231         off = 0;
 232
 233         while (off < len) {
 234                 gapstart = COUNT % 64;
 235                 gaplen = 64 - gapstart;
 236
 237                 copysiz = (gaplen < len - off) ? gaplen : len - off;
 238                 bcopy(&input[off], &ctxt->m.b8[gapstart], copysiz);
 239                 COUNT += copysiz;
 240                 COUNT %= 64;
 241                 ctxt->c.b64[0] += copysiz * 8;
 242                 if (COUNT % 64 == 0)
 243                         sha1_step(ctxt);
 244                 off += copysiz;
 245         }
 246 }
 247
 248 void
 249 sha1_result(ctxt, digest0)
 250         struct sha1_ctxt *ctxt;
 251         caddr_t digest0;
 252 {
 253         u_int8_t *digest;
 254
 255         digest = (u_int8_t *)digest0;
 256         sha1_pad(ctxt);
 257 #if BYTE_ORDER == BIG_ENDIAN
 258         bcopy(&ctxt->h.b8[0], digest, 20);
 259 #else
 260         digest[0] = ctxt->h.b8[3]; digest[1] = ctxt->h.b8[2];
 261         digest[2] = ctxt->h.b8[1]; digest[3] = ctxt->h.b8[0];
 262         digest[4] = ctxt->h.b8[7]; digest[5] = ctxt->h.b8[6];
 263         digest[6] = ctxt->h.b8[5]; digest[7] = ctxt->h.b8[4];
 264         digest[8] = ctxt->h.b8[11]; digest[9] = ctxt->h.b8[10];
 265         digest[10] = ctxt->h.b8[9]; digest[11] = ctxt->h.b8[8];
 266         digest[12] = ctxt->h.b8[15]; digest[13] = ctxt->h.b8[14];
 267         digest[14] = ctxt->h.b8[13]; digest[15] = ctxt->h.b8[12];
 268         digest[16] = ctxt->h.b8[19]; digest[17] = ctxt->h.b8[18];
 269         digest[18] = ctxt->h.b8[17]; digest[19] = ctxt->h.b8[16];
 270 #endif
 271 }
 272
 273 #endif /*unsupported*/