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postgresql/src/common/md5.c

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/*-------------------------------------------------------------------------
*
* 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) 1996-2024, 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);
}
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