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277 lines
8.6 KiB
C
277 lines
8.6 KiB
C
/* $KAME: sha1.c,v 1.5 2000/11/08 06:13:08 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
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* based on: http://csrc.nist.gov/fips/fip180-1.txt
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* implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/cdefs.h>
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#include <sys/time.h>
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#include <sys/systm.h>
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#include <crypto/sha1.h>
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/* sanity check */
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#if BYTE_ORDER != BIG_ENDIAN
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# if BYTE_ORDER != LITTLE_ENDIAN
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# define unsupported 1
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# endif
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#endif
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#ifndef unsupported
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/* constant table */
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static u_int32_t _K[] = { 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6 };
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#define K(t) _K[(t) / 20]
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#define F0(b, c, d) (((b) & (c)) | ((~(b)) & (d)))
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#define F1(b, c, d) (((b) ^ (c)) ^ (d))
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#define F2(b, c, d) (((b) & (c)) | ((b) & (d)) | ((c) & (d)))
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#define F3(b, c, d) (((b) ^ (c)) ^ (d))
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#define S(n, x) (((x) << (n)) | ((x) >> (32 - n)))
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#define H(n) (ctxt->h.b32[(n)])
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#define COUNT (ctxt->count)
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#define BCOUNT (ctxt->c.b64[0] / 8)
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#define W(n) (ctxt->m.b32[(n)])
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#define PUTBYTE(x) { \
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ctxt->m.b8[(COUNT % 64)] = (x); \
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COUNT++; \
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COUNT %= 64; \
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ctxt->c.b64[0] += 8; \
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if (COUNT % 64 == 0) \
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sha1_step(ctxt); \
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}
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#define PUTPAD(x) { \
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ctxt->m.b8[(COUNT % 64)] = (x); \
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COUNT++; \
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COUNT %= 64; \
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if (COUNT % 64 == 0) \
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sha1_step(ctxt); \
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}
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static void sha1_step(struct sha1_ctxt *);
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static void
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sha1_step(ctxt)
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struct sha1_ctxt *ctxt;
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{
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u_int32_t a, b, c, d, e;
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size_t t, s;
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u_int32_t tmp;
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#if BYTE_ORDER == LITTLE_ENDIAN
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struct sha1_ctxt tctxt;
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bcopy(&ctxt->m.b8[0], &tctxt.m.b8[0], 64);
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ctxt->m.b8[0] = tctxt.m.b8[3]; ctxt->m.b8[1] = tctxt.m.b8[2];
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ctxt->m.b8[2] = tctxt.m.b8[1]; ctxt->m.b8[3] = tctxt.m.b8[0];
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ctxt->m.b8[4] = tctxt.m.b8[7]; ctxt->m.b8[5] = tctxt.m.b8[6];
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ctxt->m.b8[6] = tctxt.m.b8[5]; ctxt->m.b8[7] = tctxt.m.b8[4];
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ctxt->m.b8[8] = tctxt.m.b8[11]; ctxt->m.b8[9] = tctxt.m.b8[10];
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ctxt->m.b8[10] = tctxt.m.b8[9]; ctxt->m.b8[11] = tctxt.m.b8[8];
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ctxt->m.b8[12] = tctxt.m.b8[15]; ctxt->m.b8[13] = tctxt.m.b8[14];
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ctxt->m.b8[14] = tctxt.m.b8[13]; ctxt->m.b8[15] = tctxt.m.b8[12];
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ctxt->m.b8[16] = tctxt.m.b8[19]; ctxt->m.b8[17] = tctxt.m.b8[18];
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ctxt->m.b8[18] = tctxt.m.b8[17]; ctxt->m.b8[19] = tctxt.m.b8[16];
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ctxt->m.b8[20] = tctxt.m.b8[23]; ctxt->m.b8[21] = tctxt.m.b8[22];
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ctxt->m.b8[22] = tctxt.m.b8[21]; ctxt->m.b8[23] = tctxt.m.b8[20];
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ctxt->m.b8[24] = tctxt.m.b8[27]; ctxt->m.b8[25] = tctxt.m.b8[26];
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ctxt->m.b8[26] = tctxt.m.b8[25]; ctxt->m.b8[27] = tctxt.m.b8[24];
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ctxt->m.b8[28] = tctxt.m.b8[31]; ctxt->m.b8[29] = tctxt.m.b8[30];
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ctxt->m.b8[30] = tctxt.m.b8[29]; ctxt->m.b8[31] = tctxt.m.b8[28];
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ctxt->m.b8[32] = tctxt.m.b8[35]; ctxt->m.b8[33] = tctxt.m.b8[34];
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ctxt->m.b8[34] = tctxt.m.b8[33]; ctxt->m.b8[35] = tctxt.m.b8[32];
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ctxt->m.b8[36] = tctxt.m.b8[39]; ctxt->m.b8[37] = tctxt.m.b8[38];
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ctxt->m.b8[38] = tctxt.m.b8[37]; ctxt->m.b8[39] = tctxt.m.b8[36];
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ctxt->m.b8[40] = tctxt.m.b8[43]; ctxt->m.b8[41] = tctxt.m.b8[42];
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ctxt->m.b8[42] = tctxt.m.b8[41]; ctxt->m.b8[43] = tctxt.m.b8[40];
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ctxt->m.b8[44] = tctxt.m.b8[47]; ctxt->m.b8[45] = tctxt.m.b8[46];
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ctxt->m.b8[46] = tctxt.m.b8[45]; ctxt->m.b8[47] = tctxt.m.b8[44];
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ctxt->m.b8[48] = tctxt.m.b8[51]; ctxt->m.b8[49] = tctxt.m.b8[50];
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ctxt->m.b8[50] = tctxt.m.b8[49]; ctxt->m.b8[51] = tctxt.m.b8[48];
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ctxt->m.b8[52] = tctxt.m.b8[55]; ctxt->m.b8[53] = tctxt.m.b8[54];
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ctxt->m.b8[54] = tctxt.m.b8[53]; ctxt->m.b8[55] = tctxt.m.b8[52];
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ctxt->m.b8[56] = tctxt.m.b8[59]; ctxt->m.b8[57] = tctxt.m.b8[58];
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ctxt->m.b8[58] = tctxt.m.b8[57]; ctxt->m.b8[59] = tctxt.m.b8[56];
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ctxt->m.b8[60] = tctxt.m.b8[63]; ctxt->m.b8[61] = tctxt.m.b8[62];
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ctxt->m.b8[62] = tctxt.m.b8[61]; ctxt->m.b8[63] = tctxt.m.b8[60];
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#endif
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a = H(0); b = H(1); c = H(2); d = H(3); e = H(4);
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for (t = 0; t < 20; t++) {
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s = t & 0x0f;
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if (t >= 16) {
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W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
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}
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tmp = S(5, a) + F0(b, c, d) + e + W(s) + K(t);
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e = d; d = c; c = S(30, b); b = a; a = tmp;
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}
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for (t = 20; t < 40; t++) {
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s = t & 0x0f;
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W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
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tmp = S(5, a) + F1(b, c, d) + e + W(s) + K(t);
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e = d; d = c; c = S(30, b); b = a; a = tmp;
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}
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for (t = 40; t < 60; t++) {
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s = t & 0x0f;
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W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
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tmp = S(5, a) + F2(b, c, d) + e + W(s) + K(t);
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e = d; d = c; c = S(30, b); b = a; a = tmp;
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}
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for (t = 60; t < 80; t++) {
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s = t & 0x0f;
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W(s) = S(1, W((s+13) & 0x0f) ^ W((s+8) & 0x0f) ^ W((s+2) & 0x0f) ^ W(s));
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tmp = S(5, a) + F3(b, c, d) + e + W(s) + K(t);
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e = d; d = c; c = S(30, b); b = a; a = tmp;
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}
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H(0) = H(0) + a;
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H(1) = H(1) + b;
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H(2) = H(2) + c;
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H(3) = H(3) + d;
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H(4) = H(4) + e;
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bzero(&ctxt->m.b8[0], 64);
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}
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/*------------------------------------------------------------*/
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void
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sha1_init(ctxt)
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struct sha1_ctxt *ctxt;
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{
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bzero(ctxt, sizeof(struct sha1_ctxt));
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H(0) = 0x67452301;
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H(1) = 0xefcdab89;
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H(2) = 0x98badcfe;
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H(3) = 0x10325476;
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H(4) = 0xc3d2e1f0;
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}
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void
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sha1_pad(ctxt)
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struct sha1_ctxt *ctxt;
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{
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size_t padlen; /*pad length in bytes*/
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size_t padstart;
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PUTPAD(0x80);
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padstart = COUNT % 64;
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padlen = 64 - padstart;
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if (padlen < 8) {
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bzero(&ctxt->m.b8[padstart], padlen);
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COUNT += padlen;
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COUNT %= 64;
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sha1_step(ctxt);
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padstart = COUNT % 64; /* should be 0 */
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padlen = 64 - padstart; /* should be 64 */
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}
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bzero(&ctxt->m.b8[padstart], padlen - 8);
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COUNT += (padlen - 8);
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COUNT %= 64;
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#if BYTE_ORDER == BIG_ENDIAN
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PUTPAD(ctxt->c.b8[0]); PUTPAD(ctxt->c.b8[1]);
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PUTPAD(ctxt->c.b8[2]); PUTPAD(ctxt->c.b8[3]);
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PUTPAD(ctxt->c.b8[4]); PUTPAD(ctxt->c.b8[5]);
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PUTPAD(ctxt->c.b8[6]); PUTPAD(ctxt->c.b8[7]);
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#else
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PUTPAD(ctxt->c.b8[7]); PUTPAD(ctxt->c.b8[6]);
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PUTPAD(ctxt->c.b8[5]); PUTPAD(ctxt->c.b8[4]);
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PUTPAD(ctxt->c.b8[3]); PUTPAD(ctxt->c.b8[2]);
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PUTPAD(ctxt->c.b8[1]); PUTPAD(ctxt->c.b8[0]);
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#endif
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}
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void
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sha1_loop(ctxt, input, len)
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struct sha1_ctxt *ctxt;
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const u_int8_t *input;
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size_t len;
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{
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size_t gaplen;
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size_t gapstart;
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size_t off;
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size_t copysiz;
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off = 0;
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while (off < len) {
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gapstart = COUNT % 64;
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gaplen = 64 - gapstart;
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copysiz = (gaplen < len - off) ? gaplen : len - off;
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bcopy(&input[off], &ctxt->m.b8[gapstart], copysiz);
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COUNT += copysiz;
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COUNT %= 64;
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ctxt->c.b64[0] += copysiz * 8;
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if (COUNT % 64 == 0)
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sha1_step(ctxt);
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off += copysiz;
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}
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}
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void
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sha1_result(ctxt, digest0)
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struct sha1_ctxt *ctxt;
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caddr_t digest0;
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{
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u_int8_t *digest;
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digest = (u_int8_t *)digest0;
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sha1_pad(ctxt);
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#if BYTE_ORDER == BIG_ENDIAN
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bcopy(&ctxt->h.b8[0], digest, 20);
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#else
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digest[0] = ctxt->h.b8[3]; digest[1] = ctxt->h.b8[2];
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digest[2] = ctxt->h.b8[1]; digest[3] = ctxt->h.b8[0];
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digest[4] = ctxt->h.b8[7]; digest[5] = ctxt->h.b8[6];
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digest[6] = ctxt->h.b8[5]; digest[7] = ctxt->h.b8[4];
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digest[8] = ctxt->h.b8[11]; digest[9] = ctxt->h.b8[10];
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digest[10] = ctxt->h.b8[9]; digest[11] = ctxt->h.b8[8];
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digest[12] = ctxt->h.b8[15]; digest[13] = ctxt->h.b8[14];
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digest[14] = ctxt->h.b8[13]; digest[15] = ctxt->h.b8[12];
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digest[16] = ctxt->h.b8[19]; digest[17] = ctxt->h.b8[18];
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digest[18] = ctxt->h.b8[17]; digest[19] = ctxt->h.b8[16];
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#endif
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}
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#endif /*unsupported*/
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