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Diffstat (limited to 'src/common/md5.c')
| -rw-r--r-- | src/common/md5.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/src/common/md5.c b/src/common/md5.c new file mode 100644 index 0000000..7d3b639 --- /dev/null +++ b/src/common/md5.c @@ -0,0 +1,439 @@ +/*------------------------------------------------------------------------- + * + * md5.c + * Implements the MD5 Message-Digest Algorithm + * + * Fallback implementation of MD5, as specified in RFC 1321. This + * implementation is a simple one, in that it needs every input byte + * to be buffered before doing any calculations. + * + * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * IDENTIFICATION + * src/common/md5.c + * + *------------------------------------------------------------------------- + */ + +/* $KAME: md5.c,v 1.3 2000/02/22 14:01:17 itojun Exp $ */ + +/* + * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the project nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef FRONTEND +#include "postgres.h" +#else +#include "postgres_fe.h" +#endif + +#include "md5_int.h" + +#define SHIFT(X, s) (((X) << (s)) | ((X) >> (32 - (s)))) + +#define F(X, Y, Z) (((X) & (Y)) | ((~X) & (Z))) +#define G(X, Y, Z) (((X) & (Z)) | ((Y) & (~Z))) +#define H(X, Y, Z) ((X) ^ (Y) ^ (Z)) +#define I(X, Y, Z) ((Y) ^ ((X) | (~Z))) + +#define ROUND1(a, b, c, d, k, s, i) \ +do { \ + (a) = (a) + F((b), (c), (d)) + X[(k)] + T[(i)]; \ + (a) = SHIFT((a), (s)); \ + (a) = (b) + (a); \ +} while (0) + +#define ROUND2(a, b, c, d, k, s, i) \ +do { \ + (a) = (a) + G((b), (c), (d)) + X[(k)] + T[(i)]; \ + (a) = SHIFT((a), (s)); \ + (a) = (b) + (a); \ +} while (0) + +#define ROUND3(a, b, c, d, k, s, i) \ +do { \ + (a) = (a) + H((b), (c), (d)) + X[(k)] + T[(i)]; \ + (a) = SHIFT((a), (s)); \ + (a) = (b) + (a); \ +} while (0) + +#define ROUND4(a, b, c, d, k, s, i) \ +do { \ + (a) = (a) + I((b), (c), (d)) + X[(k)] + T[(i)]; \ + (a) = SHIFT((a), (s)); \ + (a) = (b) + (a); \ +} while (0) + +#define Sa 7 +#define Sb 12 +#define Sc 17 +#define Sd 22 + +#define Se 5 +#define Sf 9 +#define Sg 14 +#define Sh 20 + +#define Si 4 +#define Sj 11 +#define Sk 16 +#define Sl 23 + +#define Sm 6 +#define Sn 10 +#define So 15 +#define Sp 21 + +#define MD5_A0 0x67452301 +#define MD5_B0 0xefcdab89 +#define MD5_C0 0x98badcfe +#define MD5_D0 0x10325476 + +/* Integer part of 4294967296 times abs(sin(i)), where i is in radians. */ +static const uint32 T[65] = { + 0, + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, + 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, + 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, + 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, + + 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, + 0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, + 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, + 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, + + 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, + 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, + 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, + 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, + + 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, + 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, + 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, + 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, +}; + +static const uint8 md5_paddat[MD5_BUFLEN] = { + 0x80, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, +}; + +#ifdef WORDS_BIGENDIAN +static uint32 X[16]; +#endif + +static void +md5_calc(const uint8 *b64, pg_md5_ctx *ctx) +{ + uint32 A = ctx->md5_sta; + uint32 B = ctx->md5_stb; + uint32 C = ctx->md5_stc; + uint32 D = ctx->md5_std; + +#ifndef WORDS_BIGENDIAN + const uint32 *X = (const uint32 *) b64; +#else + /* 4 byte words */ + /* what a brute force but fast! */ + uint8 *y = (uint8 *) X; + + y[0] = b64[3]; + y[1] = b64[2]; + y[2] = b64[1]; + y[3] = b64[0]; + y[4] = b64[7]; + y[5] = b64[6]; + y[6] = b64[5]; + y[7] = b64[4]; + y[8] = b64[11]; + y[9] = b64[10]; + y[10] = b64[9]; + y[11] = b64[8]; + y[12] = b64[15]; + y[13] = b64[14]; + y[14] = b64[13]; + y[15] = b64[12]; + y[16] = b64[19]; + y[17] = b64[18]; + y[18] = b64[17]; + y[19] = b64[16]; + y[20] = b64[23]; + y[21] = b64[22]; + y[22] = b64[21]; + y[23] = b64[20]; + y[24] = b64[27]; + y[25] = b64[26]; + y[26] = b64[25]; + y[27] = b64[24]; + y[28] = b64[31]; + y[29] = b64[30]; + y[30] = b64[29]; + y[31] = b64[28]; + y[32] = b64[35]; + y[33] = b64[34]; + y[34] = b64[33]; + y[35] = b64[32]; + y[36] = b64[39]; + y[37] = b64[38]; + y[38] = b64[37]; + y[39] = b64[36]; + y[40] = b64[43]; + y[41] = b64[42]; + y[42] = b64[41]; + y[43] = b64[40]; + y[44] = b64[47]; + y[45] = b64[46]; + y[46] = b64[45]; + y[47] = b64[44]; + y[48] = b64[51]; + y[49] = b64[50]; + y[50] = b64[49]; + y[51] = b64[48]; + y[52] = b64[55]; + y[53] = b64[54]; + y[54] = b64[53]; + y[55] = b64[52]; + y[56] = b64[59]; + y[57] = b64[58]; + y[58] = b64[57]; + y[59] = b64[56]; + y[60] = b64[63]; + y[61] = b64[62]; + y[62] = b64[61]; + y[63] = b64[60]; +#endif + + ROUND1(A, B, C, D, 0, Sa, 1); + ROUND1(D, A, B, C, 1, Sb, 2); + ROUND1(C, D, A, B, 2, Sc, 3); + ROUND1(B, C, D, A, 3, Sd, 4); + ROUND1(A, B, C, D, 4, Sa, 5); + ROUND1(D, A, B, C, 5, Sb, 6); + ROUND1(C, D, A, B, 6, Sc, 7); + ROUND1(B, C, D, A, 7, Sd, 8); + ROUND1(A, B, C, D, 8, Sa, 9); + ROUND1(D, A, B, C, 9, Sb, 10); + ROUND1(C, D, A, B, 10, Sc, 11); + ROUND1(B, C, D, A, 11, Sd, 12); + ROUND1(A, B, C, D, 12, Sa, 13); + ROUND1(D, A, B, C, 13, Sb, 14); + ROUND1(C, D, A, B, 14, Sc, 15); + ROUND1(B, C, D, A, 15, Sd, 16); + + ROUND2(A, B, C, D, 1, Se, 17); + ROUND2(D, A, B, C, 6, Sf, 18); + ROUND2(C, D, A, B, 11, Sg, 19); + ROUND2(B, C, D, A, 0, Sh, 20); + ROUND2(A, B, C, D, 5, Se, 21); + ROUND2(D, A, B, C, 10, Sf, 22); + ROUND2(C, D, A, B, 15, Sg, 23); + ROUND2(B, C, D, A, 4, Sh, 24); + ROUND2(A, B, C, D, 9, Se, 25); + ROUND2(D, A, B, C, 14, Sf, 26); + ROUND2(C, D, A, B, 3, Sg, 27); + ROUND2(B, C, D, A, 8, Sh, 28); + ROUND2(A, B, C, D, 13, Se, 29); + ROUND2(D, A, B, C, 2, Sf, 30); + ROUND2(C, D, A, B, 7, Sg, 31); + ROUND2(B, C, D, A, 12, Sh, 32); + + ROUND3(A, B, C, D, 5, Si, 33); + ROUND3(D, A, B, C, 8, Sj, 34); + ROUND3(C, D, A, B, 11, Sk, 35); + ROUND3(B, C, D, A, 14, Sl, 36); + ROUND3(A, B, C, D, 1, Si, 37); + ROUND3(D, A, B, C, 4, Sj, 38); + ROUND3(C, D, A, B, 7, Sk, 39); + ROUND3(B, C, D, A, 10, Sl, 40); + ROUND3(A, B, C, D, 13, Si, 41); + ROUND3(D, A, B, C, 0, Sj, 42); + ROUND3(C, D, A, B, 3, Sk, 43); + ROUND3(B, C, D, A, 6, Sl, 44); + ROUND3(A, B, C, D, 9, Si, 45); + ROUND3(D, A, B, C, 12, Sj, 46); + ROUND3(C, D, A, B, 15, Sk, 47); + ROUND3(B, C, D, A, 2, Sl, 48); + + ROUND4(A, B, C, D, 0, Sm, 49); + ROUND4(D, A, B, C, 7, Sn, 50); + ROUND4(C, D, A, B, 14, So, 51); + ROUND4(B, C, D, A, 5, Sp, 52); + ROUND4(A, B, C, D, 12, Sm, 53); + ROUND4(D, A, B, C, 3, Sn, 54); + ROUND4(C, D, A, B, 10, So, 55); + ROUND4(B, C, D, A, 1, Sp, 56); + ROUND4(A, B, C, D, 8, Sm, 57); + ROUND4(D, A, B, C, 15, Sn, 58); + ROUND4(C, D, A, B, 6, So, 59); + ROUND4(B, C, D, A, 13, Sp, 60); + ROUND4(A, B, C, D, 4, Sm, 61); + ROUND4(D, A, B, C, 11, Sn, 62); + ROUND4(C, D, A, B, 2, So, 63); + ROUND4(B, C, D, A, 9, Sp, 64); + + ctx->md5_sta += A; + ctx->md5_stb += B; + ctx->md5_stc += C; + ctx->md5_std += D; +} + +static void +md5_pad(pg_md5_ctx *ctx) +{ + unsigned int gap; + + /* Don't count up padding. Keep md5_n. */ + gap = MD5_BUFLEN - ctx->md5_i; + if (gap > 8) + { + memmove(ctx->md5_buf + ctx->md5_i, md5_paddat, + gap - sizeof(ctx->md5_n)); + } + else + { + /* including gap == 8 */ + memmove(ctx->md5_buf + ctx->md5_i, md5_paddat, gap); + md5_calc(ctx->md5_buf, ctx); + memmove(ctx->md5_buf, md5_paddat + gap, + MD5_BUFLEN - sizeof(ctx->md5_n)); + } + + /* 8 byte word */ +#ifndef WORDS_BIGENDIAN + memmove(&ctx->md5_buf[56], &ctx->md5_n8[0], 8); +#else + ctx->md5_buf[56] = ctx->md5_n8[7]; + ctx->md5_buf[57] = ctx->md5_n8[6]; + ctx->md5_buf[58] = ctx->md5_n8[5]; + ctx->md5_buf[59] = ctx->md5_n8[4]; + ctx->md5_buf[60] = ctx->md5_n8[3]; + ctx->md5_buf[61] = ctx->md5_n8[2]; + ctx->md5_buf[62] = ctx->md5_n8[1]; + ctx->md5_buf[63] = ctx->md5_n8[0]; +#endif + + md5_calc(ctx->md5_buf, ctx); +} + +static void +md5_result(uint8 *digest, pg_md5_ctx *ctx) +{ + /* 4 byte words */ +#ifndef WORDS_BIGENDIAN + memmove(digest, &ctx->md5_st8[0], 16); +#else + digest[0] = ctx->md5_st8[3]; + digest[1] = ctx->md5_st8[2]; + digest[2] = ctx->md5_st8[1]; + digest[3] = ctx->md5_st8[0]; + digest[4] = ctx->md5_st8[7]; + digest[5] = ctx->md5_st8[6]; + digest[6] = ctx->md5_st8[5]; + digest[7] = ctx->md5_st8[4]; + digest[8] = ctx->md5_st8[11]; + digest[9] = ctx->md5_st8[10]; + digest[10] = ctx->md5_st8[9]; + digest[11] = ctx->md5_st8[8]; + digest[12] = ctx->md5_st8[15]; + digest[13] = ctx->md5_st8[14]; + digest[14] = ctx->md5_st8[13]; + digest[15] = ctx->md5_st8[12]; +#endif +} + + +/* External routines for this MD5 implementation */ + +/* + * pg_md5_init + * + * Initialize a MD5 context. + */ +void +pg_md5_init(pg_md5_ctx *ctx) +{ + ctx->md5_n = 0; + ctx->md5_i = 0; + ctx->md5_sta = MD5_A0; + ctx->md5_stb = MD5_B0; + ctx->md5_stc = MD5_C0; + ctx->md5_std = MD5_D0; + memset(ctx->md5_buf, 0, sizeof(ctx->md5_buf)); +} + + +/* + * pg_md5_update + * + * Update a MD5 context. + */ +void +pg_md5_update(pg_md5_ctx *ctx, const uint8 *data, size_t len) +{ + unsigned int gap, + i; + + ctx->md5_n += len * 8; /* byte to bit */ + gap = MD5_BUFLEN - ctx->md5_i; + + if (len >= gap) + { + memmove(ctx->md5_buf + ctx->md5_i, data, gap); + md5_calc(ctx->md5_buf, ctx); + + for (i = gap; i + MD5_BUFLEN <= len; i += MD5_BUFLEN) + md5_calc(data + i, ctx); + + ctx->md5_i = len - i; + memmove(ctx->md5_buf, data + i, ctx->md5_i); + } + else + { + memmove(ctx->md5_buf + ctx->md5_i, data, len); + ctx->md5_i += len; + } +} + +/* + * pg_md5_final + * + * Finalize a MD5 context. + */ +void +pg_md5_final(pg_md5_ctx *ctx, uint8 *dest) +{ + md5_pad(ctx); + md5_result(dest, ctx); +} |