Now available: 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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