From 117bac1e2d0f8688bf72c437407040cfd5f96176 Mon Sep 17 00:00:00 2001 From: Ben Gras Date: Fri, 16 Jul 2010 00:06:00 +0000 Subject: [PATCH] libutil: md5 functions. --- include/minix/md5.h | 54 +++++++ lib/libutil/md5c.c | 379 ++++++++++++++++++++++++++++++++++++++++++++ lib/libutil/md5hl.c | 105 ++++++++++++ man/man3/Makefile | 2 +- man/man3/md5.3 | 130 +++++++++++++++ 5 files changed, 669 insertions(+), 1 deletion(-) create mode 100644 include/minix/md5.h create mode 100644 lib/libutil/md5c.c create mode 100644 lib/libutil/md5hl.c create mode 100644 man/man3/md5.3 diff --git a/include/minix/md5.h b/include/minix/md5.h new file mode 100644 index 000000000..20ee91429 --- /dev/null +++ b/include/minix/md5.h @@ -0,0 +1,54 @@ +/* $NetBSD: md5.h,v 1.5 2008/10/08 14:28:14 joerg Exp $ */ + +/* + * This file is derived from the RSA Data Security, Inc. MD5 Message-Digest + * Algorithm and has been modified by Jason R. Thorpe + * for portability and formatting. + */ + +/* + * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All + * rights reserved. + * + * License to copy and use this software is granted provided that it + * is identified as the "RSA Data Security, Inc. MD5 Message-Digest + * Algorithm" in all material mentioning or referencing this software + * or this function. + * + * License is also granted to make and use derivative works provided + * that such works are identified as "derived from the RSA Data + * Security, Inc. MD5 Message-Digest Algorithm" in all material + * mentioning or referencing the derived work. + * + * RSA Data Security, Inc. makes no representations concerning either + * the merchantability of this software or the suitability of this + * software for any particular purpose. It is provided "as is" + * without express or implied warranty of any kind. + * + * These notices must be retained in any copies of any part of this + * documentation and/or software. + */ + +#ifndef _NBCOMPAT_SYS_MD5_H_ +#define _NBCOMPAT_SYS_MD5_H_ + +#include + +#define MD5_DIGEST_LENGTH 16 +#define MD5_DIGEST_STRING_LENGTH 33 + +/* MD5 context. */ +typedef struct MD5Context { + uint32_t state[4]; /* state (ABCD) */ + uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */ + unsigned char buffer[64]; /* input buffer */ +} MD5_CTX; + +void MD5Init(MD5_CTX *); +void MD5Update(MD5_CTX *, const unsigned char *, unsigned int); +void MD5Final(unsigned char[16], MD5_CTX *); +char *MD5End(MD5_CTX *, char *); +char *MD5File(const char *, char *); +char *MD5Data(const unsigned char *, unsigned int, char *); + +#endif /* !_NBCOMPAT_SYS_MD5_H_ */ diff --git a/lib/libutil/md5c.c b/lib/libutil/md5c.c new file mode 100644 index 000000000..6c381867e --- /dev/null +++ b/lib/libutil/md5c.c @@ -0,0 +1,379 @@ +/* $NetBSD: md5c.c,v 1.7 2008/10/06 12:36:20 joerg Exp $ */ + +/* + * This file is derived from the RSA Data Security, Inc. MD5 Message-Digest + * Algorithm and has been modified by Jason R. Thorpe + * for portability and formatting. + */ + +/* + * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All + * rights reserved. + * + * License to copy and use this software is granted provided that it + * is identified as the "RSA Data Security, Inc. MD5 Message-Digest + * Algorithm" in all material mentioning or referencing this software + * or this function. + * + * License is also granted to make and use derivative works provided + * that such works are identified as "derived from the RSA Data + * Security, Inc. MD5 Message-Digest Algorithm" in all material + * mentioning or referencing the derived work. + * + * RSA Data Security, Inc. makes no representations concerning either + * the merchantability of this software or the suitability of this + * software for any particular purpose. It is provided "as is" + * without express or implied warranty of any kind. + * + * These notices must be retained in any copies of any part of this + * documentation and/or software. + */ + +#if defined(_KERNEL) || defined(_STANDALONE) +#include +#include +#include +#define _DIAGASSERT(x) (void)0 +#else +#if 0 +#include "namespace.h" +#endif +#include +#include +#include +#include +#endif /* _KERNEL || _STANDALONE */ + +#if HAVE_NBTOOL_CONFIG_H +#include "nbtool_config.h" +#endif + +#ifndef __minix +#if defined(HAVE_MEMSET) +#define ZEROIZE(d, l) memset((d), 0, (l)) +#else +# if defined(HAVE_BZERO) +#define ZEROIZE(d, l) bzero((d), (l)) +# else +#error You need either memset or bzero +# endif +#endif +#else +#define ZEROIZE(d, l) memset((d), 0, (l)) +#endif + +#define _DIAGASSERT assert + +typedef unsigned char *POINTER; +typedef uint16_t UINT2; +typedef uint32_t UINT4; + +/* + * Constants for MD5Transform routine. + */ +#define S11 7 +#define S12 12 +#define S13 17 +#define S14 22 +#define S21 5 +#define S22 9 +#define S23 14 +#define S24 20 +#define S31 4 +#define S32 11 +#define S33 16 +#define S34 23 +#define S41 6 +#define S42 10 +#define S43 15 +#define S44 21 + +#if 0 +#if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias) +__weak_alias(MD5Init,_MD5Init) +__weak_alias(MD5Update,_MD5Update) +__weak_alias(MD5Final,_MD5Final) +#endif +#endif + +static void MD5Transform __P((UINT4 [4], const unsigned char [64])); + +static void Encode __P((unsigned char *, UINT4 *, unsigned int)); +static void Decode __P((UINT4 *, const unsigned char *, unsigned int)); + +/* + * Encodes input (UINT4) into output (unsigned char). Assumes len is + * a multiple of 4. + */ +static void +Encode (output, input, len) + unsigned char *output; + UINT4 *input; + unsigned int len; +{ + unsigned int i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) { + output[j] = (unsigned char)(input[i] & 0xff); + output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); + output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); + output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); + } +} + +/* + * Decodes input (unsigned char) into output (UINT4). Assumes len is + * a multiple of 4. + */ +static void +Decode (output, input, len) + UINT4 *output; + const unsigned char *input; + unsigned int len; +{ + unsigned int i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) + output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | + (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); +} + +static const unsigned char PADDING[64] = { + 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 +}; + +/* + * F, G, H and I are basic MD5 functions. + */ +#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))) + +/* + * ROTATE_LEFT rotates x left n bits. + */ +#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) + +/* + * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. + * Rotation is separate from addition to prevent recomputation. + */ +#define FF(a, b, c, d, x, s, ac) { \ + (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ +} + +#define GG(a, b, c, d, x, s, ac) { \ + (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ +} + +#define HH(a, b, c, d, x, s, ac) { \ + (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ +} + +#define II(a, b, c, d, x, s, ac) { \ + (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ + (a) = ROTATE_LEFT ((a), (s)); \ + (a) += (b); \ +} + +/* + * MD5 initialization. Begins an MD5 operation, writing a new context. + */ +void +MD5Init(context) + MD5_CTX *context; /* context */ +{ + + _DIAGASSERT(context != 0); + + context->count[0] = context->count[1] = 0; + + /* Load magic initialization constants. */ + context->state[0] = 0x67452301; + context->state[1] = 0xefcdab89; + context->state[2] = 0x98badcfe; + context->state[3] = 0x10325476; +} + +/* + * MD5 block update operation. Continues an MD5 message-digest + * operation, processing another message block, and updating the + * context. + */ +void +MD5Update(context, input, inputLen) + MD5_CTX *context; /* context */ + const unsigned char *input; /* input block */ + unsigned int inputLen; /* length of input block */ +{ + unsigned int i, idx, partLen; + + _DIAGASSERT(context != 0); + _DIAGASSERT(input != 0); + + /* Compute number of bytes mod 64 */ + idx = (unsigned int)((context->count[0] >> 3) & 0x3F); + + /* Update number of bits */ + if ((context->count[0] += ((UINT4)inputLen << 3)) + < ((UINT4)inputLen << 3)) + context->count[1]++; + context->count[1] += ((UINT4)inputLen >> 29); + + partLen = 64 - idx; + + /* Transform as many times as possible. */ + if (inputLen >= partLen) { + /* LINTED const castaway ok */ + memcpy((POINTER)&context->buffer[idx], + (POINTER)input, partLen); + MD5Transform(context->state, context->buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) + MD5Transform(context->state, &input[i]); + + idx = 0; + } else + i = 0; + + /* Buffer remaining input */ + /* LINTED const castaway ok */ + memcpy((POINTER)&context->buffer[idx], (POINTER)&input[i], + inputLen - i); +} + +/* + * MD5 finalization. Ends an MD5 message-digest operation, writing the + * message digest and zeroing the context. + */ +void +MD5Final(digest, context) + unsigned char digest[16]; /* message digest */ + MD5_CTX *context; /* context */ +{ + unsigned char bits[8]; + unsigned int idx, padLen; + + _DIAGASSERT(digest != 0); + _DIAGASSERT(context != 0); + + /* Save number of bits */ + Encode(bits, context->count, 8); + + /* Pad out to 56 mod 64. */ + idx = (unsigned int)((context->count[0] >> 3) & 0x3f); + padLen = (idx < 56) ? (56 - idx) : (120 - idx); + MD5Update (context, PADDING, padLen); + + /* Append length (before padding) */ + MD5Update(context, bits, 8); + + /* Store state in digest */ + Encode(digest, context->state, 16); + + /* Zeroize sensitive information. */ + ZEROIZE((POINTER)(void *)context, sizeof(*context)); +} + +/* + * MD5 basic transformation. Transforms state based on block. + */ +static void +MD5Transform(state, block) + UINT4 state[4]; + const unsigned char block[64]; +{ + UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; + + Decode(x, block, 64); + + /* Round 1 */ + FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ + FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ + FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ + FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ + FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ + FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ + FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ + FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ + FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ + FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ + FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ + FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ + FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ + FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ + FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ + FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ + + /* Round 2 */ + GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ + GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ + GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ + GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ + GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ + GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */ + GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ + GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ + GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ + GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ + GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ + GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ + GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ + GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ + GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ + GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ + + /* Round 3 */ + HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ + HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ + HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ + HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ + HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ + HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ + HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ + HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ + HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ + HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ + HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ + HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ + HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ + HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ + HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ + HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ + + /* Round 4 */ + II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ + II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ + II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ + II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ + II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ + II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ + II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ + II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ + II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ + II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ + II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ + II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ + II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ + II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ + II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ + II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + + /* Zeroize sensitive information. */ + ZEROIZE((POINTER)(void *)x, sizeof (x)); +} + diff --git a/lib/libutil/md5hl.c b/lib/libutil/md5hl.c new file mode 100644 index 000000000..427ababd3 --- /dev/null +++ b/lib/libutil/md5hl.c @@ -0,0 +1,105 @@ +/* $NetBSD: mdXhl.c,v 1.2 2008/10/06 12:36:20 joerg Exp $ */ + +/* + * ---------------------------------------------------------------------------- + * "THE BEER-WARE LICENSE" (Revision 42): + * wrote this file. As long as you retain this notice you + * can do whatever you want with this stuff. If we meet some day, and you think + * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp + * ---------------------------------------------------------------------------- + * + * from FreeBSD Id: mdXhl.c,v 1.8 1996/10/25 06:48:12 bde Exp + */ + +/* + * Modifed April 29, 1997 by Jason R. Thorpe + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#define MDALGORITHM MD5 +#define CONCAT(x,y) __CONCAT(x,y) +#define MDNAME(x) CONCAT(MDALGORITHM,x) + +#define _DIAGASSERT assert + +char * +MDNAME(End)(ctx, buf) + MDNAME(_CTX) *ctx; + char *buf; +{ + int i; + unsigned char digest[16]; + static const char hex[]="0123456789abcdef"; + + _DIAGASSERT(ctx != 0); + + if (buf == NULL) + buf = malloc(33); + if (buf == NULL) + return (NULL); + + MDNAME(Final)(digest, ctx); + + for (i = 0; i < 16; i++) { + buf[i+i] = hex[(uint32_t)digest[i] >> 4]; + buf[i+i+1] = hex[digest[i] & 0x0f]; + } + + buf[i+i] = '\0'; + return (buf); +} + +char * +MDNAME(File)(filename, buf) + const char *filename; + char *buf; +{ + unsigned char buffer[BUFSIZ]; + MDNAME(_CTX) ctx; + int f, i, j; + + _DIAGASSERT(filename != 0); + /* buf may be NULL */ + + MDNAME(Init)(&ctx); + f = open(filename, O_RDONLY, 0666); + if (f < 0) + return NULL; + + while ((i = read(f, buffer, sizeof(buffer))) > 0) + MDNAME(Update)(&ctx, buffer, (unsigned int)i); + + j = errno; + close(f); + errno = j; + + if (i < 0) + return NULL; + + return (MDNAME(End)(&ctx, buf)); +} + +char * +MDNAME(Data)(data, len, buf) + const unsigned char *data; + unsigned int len; + char *buf; +{ + MDNAME(_CTX) ctx; + + _DIAGASSERT(data != 0); + + MDNAME(Init)(&ctx); + MDNAME(Update)(&ctx, data, len); + return (MDNAME(End)(&ctx, buf)); +} diff --git a/man/man3/Makefile b/man/man3/Makefile index 456b48bb8..324cae7bb 100644 --- a/man/man3/Makefile +++ b/man/man3/Makefile @@ -12,7 +12,7 @@ MAN= abort.3 abs.3 assert.3 atof.3 bstring.3 configfile.3 \ readv.3 realpath.3 regex.3 remainder.3 resolver.3 scanf.3 \ servxcheck.3 setbuf.3 setjmp.3 sigset.3 sleep.3 stdarg.3 \ stdio.3 string.3 strtol.3 syslog.3 system.3 termcap.3 \ - termios.3 time2posix.3 ttyname.3 ttyslot.3 ungetc.3 fetch.3 + termios.3 time2posix.3 ttyname.3 ttyslot.3 ungetc.3 fetch.3 md5.3 .include .include diff --git a/man/man3/md5.3 b/man/man3/md5.3 new file mode 100644 index 000000000..fcc12920f --- /dev/null +++ b/man/man3/md5.3 @@ -0,0 +1,130 @@ +.\" +.\" ---------------------------------------------------------------------------- +.\" "THE BEER-WARE LICENSE" (Revision 42): +.\" wrote this file. As long as you retain this notice you +.\" can do whatever you want with this stuff. If we meet some day, and you think +.\" this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp +.\" ---------------------------------------------------------------------------- +.\" +.\" $OpenBSD: md5.3,v 1.10 2007/05/31 19:19:29 jmc Exp $ +.\" +.Dd $Mdocdate: May 31 2007 $ +.Dt MD5 3 +.Os +.Sh NAME +.Nm MD5Init , +.Nm MD5Update , +.Nm MD5Final , +.Nm MD5End , +.Nm MD5File , +.Nm MD5Data +.Nd calculate the RSA Data Security, Inc., ``MD5'' message digest +.Sh SYNOPSIS +.Fd #include +.Fd #include +.Ft void +.Fn MD5Init "MD5_CTX *context" +.Ft void +.Fn MD5Update "MD5_CTX *context" "const u_int8_t *data" "size_t len" +.Ft void +.Fn MD5Final "u_int8_t digest[MD5_DIGEST_LENGTH]" "MD5_CTX *context" +.Ft "char *" +.Fn MD5End "MD5_CTX *context" "char *buf" +.Ft "char *" +.Fn MD5File "const char *filename" "char *buf" +.Ft "char *" +.Fn MD5Data "const u_int8_t *data" "size_t len" "char *buf" +.Sh DESCRIPTION +The MD5 functions calculate a 128-bit cryptographic checksum (digest) +for any number of input bytes. +A cryptographic checksum is a one-way +hash-function, that is, you cannot find (except by exhaustive search) +the input corresponding to a particular output. +This net result is a +.Dq fingerprint +of the input-data, which doesn't disclose the actual input. +.Pp +The +.Fn MD5Init , +.Fn MD5Update , +and +.Fn MD5Final +functions are the core functions. +Allocate an MD5_CTX, initialize it with +.Fn MD5Init , +run over the data with +.Fn MD5Update , +and finally extract the result using +.Fn MD5Final . +.Pp +.Fn MD5End +is a wrapper for +.Fn MD5Final +which converts the return value to an MD5_DIGEST_STRING_LENGTH-character +(including the terminating '\e0') +.Tn ASCII +string which represents the 128 bits in hexadecimal. +.Pp +.Fn MD5File +calculates the digest of a file, and uses +.Fn MD5End +to return the result. +If the file cannot be opened, a null pointer is returned. +.Pp +.Fn MD5Data +calculates the digest of a chunk of data in memory, and uses +.Fn MD5End +to return the result. +.Pp +When using +.Fn MD5End , +.Fn MD5File , +or +.Fn MD5Data , +the +.Ar buf +argument can be a null pointer, in which case the returned string +is allocated with +.Xr malloc 3 +and subsequently must be explicitly deallocated using +.Xr free 3 +after use. +If the +.Ar buf +argument is non-null it must point to at least MD5_DIGEST_STRING_LENGTH +characters of buffer space. +.Rs +.%A R. Rivest +.%T The MD4 Message-Digest Algorithm +.%O RFC 1186 +.Re +.Rs +.%A R. Rivest +.%T The MD5 Message-Digest Algorithm +.%O RFC 1321 +.Re +.Rs +.%A RSA Laboratories +.%T Frequently Asked Questions About today's Cryptography +.%O \& +.Re +.Rs +.%A H. Dobbertin +.%T Alf Swindles Ann +.%J CryptoBytes +.%N 1(3):5 +.%D 1995 +.Re +.Rs +.%A MJ. B. Robshaw +.%T On Recent Results for MD4 and MD5 +.%J RSA Laboratories Bulletin +.%N 4 +.%D November 12, 1996 +.Re +.Rs +.%A Hans Dobbertin +.%T Cryptanalysis of MD5 Compress +.Re +.Sh BUGS +Collisions have been found for the full version of MD5. -- 2.44.0