diff --git a/md5.c b/md5.c index c9064dc..13f8455 100644 --- a/md5.c +++ b/md5.c @@ -1,284 +1,335 @@ /* - * md5.c - Compute MD5 checksum of strings according to the - * definition of MD5 in RFC 1321 from April 1992. + * Copyright (C) 2014 Felix Fietkau * - * Written by Ulrich Drepper , 1995. + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. * - * Copyright (C) 1995-1999 Free Software Foundation, Inc. - * Copyright (C) 2001 Manuel Novoa III - * Copyright (C) 2003 Glenn L. McGrath - * Copyright (C) 2003 Erik Andersen + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +/* + * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc. + * MD5 Message-Digest Algorithm (RFC 1321). * - * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. + * Homepage: + * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5 + * + * Author: + * Alexander Peslyak, better known as Solar Designer + * + * This software was written by Alexander Peslyak in 2001. No copyright is + * claimed, and the software is hereby placed in the public domain. + * In case this attempt to disclaim copyright and place the software in the + * public domain is deemed null and void, then the software is + * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the + * general public under the following terms: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted. + * + * There's ABSOLUTELY NO WARRANTY, express or implied. + * + * (This is a heavily cut-down "BSD license".) + * + * This differs from Colin Plumb's older public domain implementation in that + * no exactly 32-bit integer data type is required (any 32-bit or wider + * unsigned integer data type will do), there's no compile-time endianness + * configuration, and the function prototypes match OpenSSL's. No code from + * Colin Plumb's implementation has been reused; this comment merely compares + * the properties of the two independent implementations. + * + * The primary goals of this implementation are portability and ease of use. + * It is meant to be fast, but not as fast as possible. Some known + * optimizations are not included to reduce source code size and avoid + * compile-time configuration. */ -#include "blob.h" /* TODO: better include for bswap_32 compat */ - -#include -#include - -#include -#include +#include +#include #include "md5.h" +/* + * The basic MD5 functions. + * + * F and G are optimized compared to their RFC 1321 definitions for + * architectures that lack an AND-NOT instruction, just like in Colin Plumb's + * implementation. + */ +#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z)))) +#define G(x, y, z) ((y) ^ ((z) & ((x) ^ (y)))) +#define H(x, y, z) (((x) ^ (y)) ^ (z)) +#define H2(x, y, z) ((x) ^ ((y) ^ (z))) +#define I(x, y, z) ((y) ^ ((x) | ~(z))) + +/* + * The MD5 transformation for all four rounds. + */ +#define STEP(f, a, b, c, d, x, t, s) \ + (a) += f((b), (c), (d)) + (x) + (t); \ + (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \ + (a) += (b); + +/* + * SET reads 4 input bytes in little-endian byte order and stores them + * in a properly aligned word in host byte order. + */ #if __BYTE_ORDER == __LITTLE_ENDIAN -#define SWAP_LE32(x) (x) +#define SET(n) \ + (*(uint32_t *)&ptr[(n) * 4]) +#define GET(n) \ + SET(n) #else -#define SWAP_LE32(x) bswap_32(x) +#define SET(n) \ + (block[(n)] = \ + (uint32_t)ptr[(n) * 4] | \ + ((uint32_t)ptr[(n) * 4 + 1] << 8) | \ + ((uint32_t)ptr[(n) * 4 + 2] << 16) | \ + ((uint32_t)ptr[(n) * 4 + 3] << 24)) +#define GET(n) \ + (block[(n)]) #endif -/* Initialize structure containing state of computation. - * (RFC 1321, 3.3: Step 3) +/* + * This processes one or more 64-byte data blocks, but does NOT update + * the bit counters. There are no alignment requirements. */ +static const void *body(md5_ctx_t *ctx, const void *data, unsigned long size) +{ + const unsigned char *ptr; + uint32_t a, b, c, d; + uint32_t saved_a, saved_b, saved_c, saved_d; +#if __BYTE_ORDER != __LITTLE_ENDIAN + uint32_t block[16]; +#endif + + ptr = (const unsigned char *)data; + + a = ctx->a; + b = ctx->b; + c = ctx->c; + d = ctx->d; + + do { + saved_a = a; + saved_b = b; + saved_c = c; + saved_d = d; + +/* Round 1 */ + STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7) + STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12) + STEP(F, c, d, a, b, SET(2), 0x242070db, 17) + STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22) + STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7) + STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12) + STEP(F, c, d, a, b, SET(6), 0xa8304613, 17) + STEP(F, b, c, d, a, SET(7), 0xfd469501, 22) + STEP(F, a, b, c, d, SET(8), 0x698098d8, 7) + STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12) + STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17) + STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22) + STEP(F, a, b, c, d, SET(12), 0x6b901122, 7) + STEP(F, d, a, b, c, SET(13), 0xfd987193, 12) + STEP(F, c, d, a, b, SET(14), 0xa679438e, 17) + STEP(F, b, c, d, a, SET(15), 0x49b40821, 22) + +/* Round 2 */ + STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5) + STEP(G, d, a, b, c, GET(6), 0xc040b340, 9) + STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14) + STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20) + STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5) + STEP(G, d, a, b, c, GET(10), 0x02441453, 9) + STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14) + STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20) + STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5) + STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9) + STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14) + STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20) + STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5) + STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9) + STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14) + STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20) + +/* Round 3 */ + STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4) + STEP(H2, d, a, b, c, GET(8), 0x8771f681, 11) + STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16) + STEP(H2, b, c, d, a, GET(14), 0xfde5380c, 23) + STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4) + STEP(H2, d, a, b, c, GET(4), 0x4bdecfa9, 11) + STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16) + STEP(H2, b, c, d, a, GET(10), 0xbebfbc70, 23) + STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4) + STEP(H2, d, a, b, c, GET(0), 0xeaa127fa, 11) + STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16) + STEP(H2, b, c, d, a, GET(6), 0x04881d05, 23) + STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4) + STEP(H2, d, a, b, c, GET(12), 0xe6db99e5, 11) + STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16) + STEP(H2, b, c, d, a, GET(2), 0xc4ac5665, 23) + +/* Round 4 */ + STEP(I, a, b, c, d, GET(0), 0xf4292244, 6) + STEP(I, d, a, b, c, GET(7), 0x432aff97, 10) + STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15) + STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21) + STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6) + STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10) + STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15) + STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21) + STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6) + STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10) + STEP(I, c, d, a, b, GET(6), 0xa3014314, 15) + STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21) + STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6) + STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10) + STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15) + STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21) + + a += saved_a; + b += saved_b; + c += saved_c; + d += saved_d; + + ptr += 64; + } while (size -= 64); + + ctx->a = a; + ctx->b = b; + ctx->c = c; + ctx->d = d; + + return ptr; +} + void md5_begin(md5_ctx_t *ctx) { - ctx->A = 0x67452301; - ctx->B = 0xefcdab89; - ctx->C = 0x98badcfe; - ctx->D = 0x10325476; + ctx->a = 0x67452301; + ctx->b = 0xefcdab89; + ctx->c = 0x98badcfe; + ctx->d = 0x10325476; - ctx->total = 0; - ctx->buflen = 0; + ctx->lo = 0; + ctx->hi = 0; } -/* These are the four functions used in the four steps of the MD5 algorithm - * and defined in the RFC 1321. The first function is a little bit optimized - * (as found in Colin Plumbs public domain implementation). - * #define FF(b, c, d) ((b & c) | (~b & d)) - */ -# define FF(b, c, d) (d ^ (b & (c ^ d))) -# define FG(b, c, d) FF (d, b, c) -# define FH(b, c, d) (b ^ c ^ d) -# define FI(b, c, d) (c ^ (b | ~d)) - -/* Hash a single block, 64 bytes long and 4-byte aligned. */ -static void md5_hash_block(const void *buffer, md5_ctx_t *ctx) +void md5_hash(const void *data, size_t size, md5_ctx_t *ctx) { - uint32_t correct_words[16]; - const uint32_t *words = buffer; + uint32_t saved_lo; + unsigned long used, available; - static const uint32_t C_array[] = { - /* round 1 */ - 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, - 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, - 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, - 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, - /* round 2 */ - 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, - 0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, - 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, - 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, - /* round 3 */ - 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, - 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, - 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, - 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, - /* round 4 */ - 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, - 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, - 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, - 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 - }; + saved_lo = ctx->lo; + if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo) + ctx->hi++; + ctx->hi += size >> 29; - static const char P_array[] = { - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */ - 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */ - 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */ - 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 /* 4 */ - }; + used = saved_lo & 0x3f; - static const char S_array[] = { - 7, 12, 17, 22, - 5, 9, 14, 20, - 4, 11, 16, 23, - 6, 10, 15, 21 - }; + if (used) { + available = 64 - used; - uint32_t A = ctx->A; - uint32_t B = ctx->B; - uint32_t C = ctx->C; - uint32_t D = ctx->D; - - uint32_t *cwp = correct_words; - -# define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s))) - - const uint32_t *pc; - const char *pp; - const char *ps; - int i; - uint32_t temp; - - for (i = 0; i < 16; i++) { - cwp[i] = SWAP_LE32(words[i]); - } - - pc = C_array; - pp = P_array; - ps = S_array; - - for (i = 0; i < 16; i++) { - temp = A + FF(B, C, D) + cwp[(int) (*pp++)] + *pc++; - CYCLIC(temp, ps[i & 3]); - temp += B; - A = D; - D = C; - C = B; - B = temp; - } - - ps += 4; - for (i = 0; i < 16; i++) { - temp = A + FG(B, C, D) + cwp[(int) (*pp++)] + *pc++; - CYCLIC(temp, ps[i & 3]); - temp += B; - A = D; - D = C; - C = B; - B = temp; - } - ps += 4; - for (i = 0; i < 16; i++) { - temp = A + FH(B, C, D) + cwp[(int) (*pp++)] + *pc++; - CYCLIC(temp, ps[i & 3]); - temp += B; - A = D; - D = C; - C = B; - B = temp; - } - ps += 4; - for (i = 0; i < 16; i++) { - temp = A + FI(B, C, D) + cwp[(int) (*pp++)] + *pc++; - CYCLIC(temp, ps[i & 3]); - temp += B; - A = D; - D = C; - C = B; - B = temp; - } - - - ctx->A += A; - ctx->B += B; - ctx->C += C; - ctx->D += D; -} - -/* Feed data through a temporary buffer to call md5_hash_aligned_block() - * with chunks of data that are 4-byte aligned and a multiple of 64 bytes. - * This function's internal buffer remembers previous data until it has 64 - * bytes worth to pass on. Call md5_end() to flush this buffer. */ - -void md5_hash(const void *buffer, size_t len, md5_ctx_t *ctx) -{ - char *buf = (char *)buffer; - - /* RFC 1321 specifies the possible length of the file up to 2^64 bits, - * Here we only track the number of bytes. */ - - ctx->total += len; - - // Process all input. - - while (len) { - unsigned i = 64 - ctx->buflen; - - // Copy data into aligned buffer. - - if (i > len) - i = len; - memcpy(ctx->buffer + ctx->buflen, buf, i); - len -= i; - ctx->buflen += i; - buf += i; - - // When buffer fills up, process it. - - if (ctx->buflen == 64) { - md5_hash_block(ctx->buffer, ctx); - ctx->buflen = 0; + if (size < available) { + memcpy(&ctx->buffer[used], data, size); + return; } + + memcpy(&ctx->buffer[used], data, available); + data = (const unsigned char *)data + available; + size -= available; + body(ctx, ctx->buffer, 64); } + + if (size >= 64) { + data = body(ctx, data, size & ~((size_t) 0x3f)); + size &= 0x3f; + } + + memcpy(ctx->buffer, data, size); } -/* Process the remaining bytes in the buffer and put result from CTX - * in first 16 bytes following RESBUF. The result is always in little - * endian byte order, so that a byte-wise output yields to the wanted - * ASCII representation of the message digest. - * - * IMPORTANT: On some systems it is required that RESBUF is correctly - * aligned for a 32 bits value. - */ void md5_end(void *resbuf, md5_ctx_t *ctx) { - char *buf = ctx->buffer; - int i; + unsigned char *result = resbuf; + unsigned long used, available; - /* Pad data to block size. */ + used = ctx->lo & 0x3f; - buf[ctx->buflen++] = 0x80; - memset(buf + ctx->buflen, 0, 128 - ctx->buflen); + ctx->buffer[used++] = 0x80; - /* Put the 64-bit file length in *bits* at the end of the buffer. */ - ctx->total <<= 3; - if (ctx->buflen > 56) - buf += 64; + available = 64 - used; - for (i = 0; i < 8; i++) - buf[56 + i] = ctx->total >> (i*8); + if (available < 8) { + memset(&ctx->buffer[used], 0, available); + body(ctx, ctx->buffer, 64); + used = 0; + available = 64; + } - /* Process last bytes. */ - if (buf != ctx->buffer) - md5_hash_block(ctx->buffer, ctx); - md5_hash_block(buf, ctx); + memset(&ctx->buffer[used], 0, available - 8); - /* Put result from CTX in first 16 bytes following RESBUF. The result is - * always in little endian byte order, so that a byte-wise output yields - * to the wanted ASCII representation of the message digest. - * - * IMPORTANT: On some systems it is required that RESBUF is correctly - * aligned for a 32 bits value. - */ - ((uint32_t *) resbuf)[0] = SWAP_LE32(ctx->A); - ((uint32_t *) resbuf)[1] = SWAP_LE32(ctx->B); - ((uint32_t *) resbuf)[2] = SWAP_LE32(ctx->C); - ((uint32_t *) resbuf)[3] = SWAP_LE32(ctx->D); + ctx->lo <<= 3; + ctx->buffer[56] = ctx->lo; + ctx->buffer[57] = ctx->lo >> 8; + ctx->buffer[58] = ctx->lo >> 16; + ctx->buffer[59] = ctx->lo >> 24; + ctx->buffer[60] = ctx->hi; + ctx->buffer[61] = ctx->hi >> 8; + ctx->buffer[62] = ctx->hi >> 16; + ctx->buffer[63] = ctx->hi >> 24; + + body(ctx, ctx->buffer, 64); + + result[0] = ctx->a; + result[1] = ctx->a >> 8; + result[2] = ctx->a >> 16; + result[3] = ctx->a >> 24; + result[4] = ctx->b; + result[5] = ctx->b >> 8; + result[6] = ctx->b >> 16; + result[7] = ctx->b >> 24; + result[8] = ctx->c; + result[9] = ctx->c >> 8; + result[10] = ctx->c >> 16; + result[11] = ctx->c >> 24; + result[12] = ctx->d; + result[13] = ctx->d >> 8; + result[14] = ctx->d >> 16; + result[15] = ctx->d >> 24; + + memset(ctx, 0, sizeof(*ctx)); } -int md5sum(char *file, uint32_t *md5) +int md5sum(char *file, void *md5_buf) { char buf[256]; md5_ctx_t ctx; - int len, fd; int ret = 0; + FILE *f; - memset(md5, 0, sizeof(*md5) * 4); - - fd = open(file, O_RDONLY); - if (fd < 0) + f = fopen(file, "r"); + if (!f) return -1; md5_begin(&ctx); do { - len = read(fd, buf, sizeof(buf)); - if (len < 0) { - if (errno == EINTR) - continue; - - ret = -1; - goto out; - } + int len = fread(buf, 1, sizeof(buf), f); if (!len) break; md5_hash(buf, len, &ctx); + ret += len; } while(1); - md5_end(md5, &ctx); -out: - close(fd); + md5_end(md5_buf, &ctx); + fclose(f); return ret; } diff --git a/md5.h b/md5.h index 6305989..b2f1b80 100644 --- a/md5.h +++ b/md5.h @@ -1,36 +1,58 @@ /* - * Copyright (C) 2013 Felix Fietkau - * Copyright (C) 2013 John Crispin + * Copyright (C) 2014 Felix Fietkau * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License version 2.1 - * as published by the Free Software Foundation + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ +/* + * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc. + * MD5 Message-Digest Algorithm (RFC 1321). + * + * Homepage: + * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5 + * + * Author: + * Alexander Peslyak, better known as Solar Designer + * + * This software was written by Alexander Peslyak in 2001. No copyright is + * claimed, and the software is hereby placed in the public domain. + * In case this attempt to disclaim copyright and place the software in the + * public domain is deemed null and void, then the software is + * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the + * general public under the following terms: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted. + * + * There's ABSOLUTELY NO WARRANTY, express or implied. + * + * See md5.c for more information. */ -#ifndef __PROCD_MD5_H -#define __PROCD_MD5_H +#ifndef _LIBUBOX_MD5_H +#define _LIBUBOX_MD5_H #include #include typedef struct md5_ctx { - uint32_t A; - uint32_t B; - uint32_t C; - uint32_t D; - uint64_t total; - uint32_t buflen; - char buffer[128]; + uint32_t lo, hi; + uint32_t a, b, c, d; + unsigned char buffer[64]; } md5_ctx_t; -void md5_begin(md5_ctx_t *ctx); -void md5_hash(const void *data, size_t length, md5_ctx_t *ctx); -void md5_end(void *resbuf, md5_ctx_t *ctx); -int md5sum(char *file, uint32_t *md5); +extern void md5_begin(md5_ctx_t *ctx); +extern void md5_hash(const void *data, size_t length, md5_ctx_t *ctx); +extern void md5_end(void *resbuf, md5_ctx_t *ctx); +int md5sum(char *file, void *md5_buf); #endif