Annotation of embedaddon/ntp/lib/isc/sha1.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
! 3: * Copyright (C) 2000, 2001, 2003 Internet Software Consortium.
! 4: *
! 5: * Permission to use, copy, modify, and/or distribute this software for any
! 6: * purpose with or without fee is hereby granted, provided that the above
! 7: * copyright notice and this permission notice appear in all copies.
! 8: *
! 9: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
! 10: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
! 11: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
! 12: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
! 13: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
! 14: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
! 15: * PERFORMANCE OF THIS SOFTWARE.
! 16: */
! 17:
! 18: /* $Id: sha1.c,v 1.18 2007/06/19 23:47:17 tbox Exp $ */
! 19:
! 20: /* $NetBSD: sha1.c,v 1.5 2000/01/22 22:19:14 mycroft Exp $ */
! 21: /* $OpenBSD: sha1.c,v 1.9 1997/07/23 21:12:32 kstailey Exp $ */
! 22:
! 23: /*! \file
! 24: * SHA-1 in C
! 25: * \author By Steve Reid <steve@edmweb.com>
! 26: * 100% Public Domain
! 27: * \verbatim
! 28: * Test Vectors (from FIPS PUB 180-1)
! 29: * "abc"
! 30: * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
! 31: * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
! 32: * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
! 33: * A million repetitions of "a"
! 34: * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
! 35: * \endverbatim
! 36: */
! 37:
! 38: #include "config.h"
! 39:
! 40: #include <isc/assertions.h>
! 41: #include <isc/sha1.h>
! 42: #include <isc/string.h>
! 43: #include <isc/types.h>
! 44: #include <isc/util.h>
! 45:
! 46: #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
! 47:
! 48: /*@{*/
! 49: /*!
! 50: * blk0() and blk() perform the initial expand.
! 51: * I got the idea of expanding during the round function from SSLeay
! 52: */
! 53: #if !defined(WORDS_BIGENDIAN)
! 54: # define blk0(i) \
! 55: (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) \
! 56: | (rol(block->l[i], 8) & 0x00FF00FF))
! 57: #else
! 58: # define blk0(i) block->l[i]
! 59: #endif
! 60: #define blk(i) \
! 61: (block->l[i & 15] = rol(block->l[(i + 13) & 15] \
! 62: ^ block->l[(i + 8) & 15] \
! 63: ^ block->l[(i + 2) & 15] \
! 64: ^ block->l[i & 15], 1))
! 65:
! 66: /*@}*/
! 67: /*@{*/
! 68: /*!
! 69: * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
! 70: */
! 71: #define R0(v,w,x,y,z,i) \
! 72: z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
! 73: w = rol(w, 30);
! 74: #define R1(v,w,x,y,z,i) \
! 75: z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
! 76: w = rol(w, 30);
! 77: #define R2(v,w,x,y,z,i) \
! 78: z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
! 79: w = rol(w, 30);
! 80: #define R3(v,w,x,y,z,i) \
! 81: z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
! 82: w = rol(w, 30);
! 83: #define R4(v,w,x,y,z,i) \
! 84: z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
! 85: w = rol(w, 30);
! 86:
! 87: /*@}*/
! 88:
! 89: typedef union {
! 90: unsigned char c[64];
! 91: unsigned int l[16];
! 92: } CHAR64LONG16;
! 93:
! 94: #ifdef __sparc_v9__
! 95: static void do_R01(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
! 96: isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
! 97: static void do_R2(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
! 98: isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
! 99: static void do_R3(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
! 100: isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
! 101: static void do_R4(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
! 102: isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
! 103:
! 104: #define nR0(v,w,x,y,z,i) R0(*v,*w,*x,*y,*z,i)
! 105: #define nR1(v,w,x,y,z,i) R1(*v,*w,*x,*y,*z,i)
! 106: #define nR2(v,w,x,y,z,i) R2(*v,*w,*x,*y,*z,i)
! 107: #define nR3(v,w,x,y,z,i) R3(*v,*w,*x,*y,*z,i)
! 108: #define nR4(v,w,x,y,z,i) R4(*v,*w,*x,*y,*z,i)
! 109:
! 110: static void
! 111: do_R01(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
! 112: isc_uint32_t *e, CHAR64LONG16 *block)
! 113: {
! 114: nR0(a,b,c,d,e, 0); nR0(e,a,b,c,d, 1); nR0(d,e,a,b,c, 2);
! 115: nR0(c,d,e,a,b, 3); nR0(b,c,d,e,a, 4); nR0(a,b,c,d,e, 5);
! 116: nR0(e,a,b,c,d, 6); nR0(d,e,a,b,c, 7); nR0(c,d,e,a,b, 8);
! 117: nR0(b,c,d,e,a, 9); nR0(a,b,c,d,e,10); nR0(e,a,b,c,d,11);
! 118: nR0(d,e,a,b,c,12); nR0(c,d,e,a,b,13); nR0(b,c,d,e,a,14);
! 119: nR0(a,b,c,d,e,15); nR1(e,a,b,c,d,16); nR1(d,e,a,b,c,17);
! 120: nR1(c,d,e,a,b,18); nR1(b,c,d,e,a,19);
! 121: }
! 122:
! 123: static void
! 124: do_R2(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
! 125: isc_uint32_t *e, CHAR64LONG16 *block)
! 126: {
! 127: nR2(a,b,c,d,e,20); nR2(e,a,b,c,d,21); nR2(d,e,a,b,c,22);
! 128: nR2(c,d,e,a,b,23); nR2(b,c,d,e,a,24); nR2(a,b,c,d,e,25);
! 129: nR2(e,a,b,c,d,26); nR2(d,e,a,b,c,27); nR2(c,d,e,a,b,28);
! 130: nR2(b,c,d,e,a,29); nR2(a,b,c,d,e,30); nR2(e,a,b,c,d,31);
! 131: nR2(d,e,a,b,c,32); nR2(c,d,e,a,b,33); nR2(b,c,d,e,a,34);
! 132: nR2(a,b,c,d,e,35); nR2(e,a,b,c,d,36); nR2(d,e,a,b,c,37);
! 133: nR2(c,d,e,a,b,38); nR2(b,c,d,e,a,39);
! 134: }
! 135:
! 136: static void
! 137: do_R3(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
! 138: isc_uint32_t *e, CHAR64LONG16 *block)
! 139: {
! 140: nR3(a,b,c,d,e,40); nR3(e,a,b,c,d,41); nR3(d,e,a,b,c,42);
! 141: nR3(c,d,e,a,b,43); nR3(b,c,d,e,a,44); nR3(a,b,c,d,e,45);
! 142: nR3(e,a,b,c,d,46); nR3(d,e,a,b,c,47); nR3(c,d,e,a,b,48);
! 143: nR3(b,c,d,e,a,49); nR3(a,b,c,d,e,50); nR3(e,a,b,c,d,51);
! 144: nR3(d,e,a,b,c,52); nR3(c,d,e,a,b,53); nR3(b,c,d,e,a,54);
! 145: nR3(a,b,c,d,e,55); nR3(e,a,b,c,d,56); nR3(d,e,a,b,c,57);
! 146: nR3(c,d,e,a,b,58); nR3(b,c,d,e,a,59);
! 147: }
! 148:
! 149: static void
! 150: do_R4(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
! 151: isc_uint32_t *e, CHAR64LONG16 *block)
! 152: {
! 153: nR4(a,b,c,d,e,60); nR4(e,a,b,c,d,61); nR4(d,e,a,b,c,62);
! 154: nR4(c,d,e,a,b,63); nR4(b,c,d,e,a,64); nR4(a,b,c,d,e,65);
! 155: nR4(e,a,b,c,d,66); nR4(d,e,a,b,c,67); nR4(c,d,e,a,b,68);
! 156: nR4(b,c,d,e,a,69); nR4(a,b,c,d,e,70); nR4(e,a,b,c,d,71);
! 157: nR4(d,e,a,b,c,72); nR4(c,d,e,a,b,73); nR4(b,c,d,e,a,74);
! 158: nR4(a,b,c,d,e,75); nR4(e,a,b,c,d,76); nR4(d,e,a,b,c,77);
! 159: nR4(c,d,e,a,b,78); nR4(b,c,d,e,a,79);
! 160: }
! 161: #endif
! 162:
! 163: /*!
! 164: * Hash a single 512-bit block. This is the core of the algorithm.
! 165: */
! 166: static void
! 167: transform(isc_uint32_t state[5], const unsigned char buffer[64]) {
! 168: isc_uint32_t a, b, c, d, e;
! 169: CHAR64LONG16 *block;
! 170: CHAR64LONG16 workspace;
! 171:
! 172: INSIST(buffer != NULL);
! 173: INSIST(state != NULL);
! 174:
! 175: block = &workspace;
! 176: (void)memcpy(block, buffer, 64);
! 177:
! 178: /* Copy context->state[] to working vars */
! 179: a = state[0];
! 180: b = state[1];
! 181: c = state[2];
! 182: d = state[3];
! 183: e = state[4];
! 184:
! 185: #ifdef __sparc_v9__
! 186: do_R01(&a, &b, &c, &d, &e, block);
! 187: do_R2(&a, &b, &c, &d, &e, block);
! 188: do_R3(&a, &b, &c, &d, &e, block);
! 189: do_R4(&a, &b, &c, &d, &e, block);
! 190: #else
! 191: /* 4 rounds of 20 operations each. Loop unrolled. */
! 192: R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
! 193: R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
! 194: R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
! 195: R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
! 196: R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
! 197: R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
! 198: R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
! 199: R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
! 200: R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
! 201: R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
! 202: R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
! 203: R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
! 204: R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
! 205: R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
! 206: R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
! 207: R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
! 208: R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
! 209: R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
! 210: R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
! 211: R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
! 212: #endif
! 213:
! 214: /* Add the working vars back into context.state[] */
! 215: state[0] += a;
! 216: state[1] += b;
! 217: state[2] += c;
! 218: state[3] += d;
! 219: state[4] += e;
! 220:
! 221: /* Wipe variables */
! 222: a = b = c = d = e = 0;
! 223: }
! 224:
! 225:
! 226: /*!
! 227: * isc_sha1_init - Initialize new context
! 228: */
! 229: void
! 230: isc_sha1_init(isc_sha1_t *context)
! 231: {
! 232: INSIST(context != NULL);
! 233:
! 234: /* SHA1 initialization constants */
! 235: context->state[0] = 0x67452301;
! 236: context->state[1] = 0xEFCDAB89;
! 237: context->state[2] = 0x98BADCFE;
! 238: context->state[3] = 0x10325476;
! 239: context->state[4] = 0xC3D2E1F0;
! 240: context->count[0] = 0;
! 241: context->count[1] = 0;
! 242: }
! 243:
! 244: void
! 245: isc_sha1_invalidate(isc_sha1_t *context) {
! 246: memset(context, 0, sizeof(isc_sha1_t));
! 247: }
! 248:
! 249: /*!
! 250: * Run your data through this.
! 251: */
! 252: void
! 253: isc_sha1_update(isc_sha1_t *context, const unsigned char *data,
! 254: unsigned int len)
! 255: {
! 256: unsigned int i, j;
! 257:
! 258: INSIST(context != 0);
! 259: INSIST(data != 0);
! 260:
! 261: j = context->count[0];
! 262: if ((context->count[0] += len << 3) < j)
! 263: context->count[1] += (len >> 29) + 1;
! 264: j = (j >> 3) & 63;
! 265: if ((j + len) > 63) {
! 266: (void)memcpy(&context->buffer[j], data, (i = 64 - j));
! 267: transform(context->state, context->buffer);
! 268: for (; i + 63 < len; i += 64)
! 269: transform(context->state, &data[i]);
! 270: j = 0;
! 271: } else {
! 272: i = 0;
! 273: }
! 274:
! 275: (void)memcpy(&context->buffer[j], &data[i], len - i);
! 276: }
! 277:
! 278:
! 279: /*!
! 280: * Add padding and return the message digest.
! 281: */
! 282:
! 283: static const unsigned char final_200 = 128;
! 284: static const unsigned char final_0 = 0;
! 285:
! 286: void
! 287: isc_sha1_final(isc_sha1_t *context, unsigned char *digest) {
! 288: unsigned int i;
! 289: unsigned char finalcount[8];
! 290:
! 291: INSIST(digest != 0);
! 292: INSIST(context != 0);
! 293:
! 294: for (i = 0; i < 8; i++) {
! 295: /* Endian independent */
! 296: finalcount[i] = (unsigned char)
! 297: ((context->count[(i >= 4 ? 0 : 1)]
! 298: >> ((3 - (i & 3)) * 8)) & 255);
! 299: }
! 300:
! 301: isc_sha1_update(context, &final_200, 1);
! 302: while ((context->count[0] & 504) != 448)
! 303: isc_sha1_update(context, &final_0, 1);
! 304: /* The next Update should cause a transform() */
! 305: isc_sha1_update(context, finalcount, 8);
! 306:
! 307: if (digest) {
! 308: for (i = 0; i < 20; i++)
! 309: digest[i] = (unsigned char)
! 310: ((context->state[i >> 2]
! 311: >> ((3 - (i & 3)) * 8)) & 255);
! 312: }
! 313:
! 314: memset(context, 0, sizeof(isc_sha1_t));
! 315: }
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