From c2253656c9ecc3a364a0b411cb54a1bc9e3743fd Mon Sep 17 00:00:00 2001 From: deberg Date: Fri, 8 Dec 2000 06:29:23 +0000 Subject: [PATCH] in-kernel MD4 implementation, from libc --- sys/lib/libkern/md4c.c | 317 +++++++++++++++++++++++++++++++++++++++++ sys/sys/md4.h | 56 ++++++++ 2 files changed, 373 insertions(+) create mode 100644 sys/lib/libkern/md4c.c create mode 100644 sys/sys/md4.h diff --git a/sys/lib/libkern/md4c.c b/sys/lib/libkern/md4c.c new file mode 100644 index 000000000000..6da7837f60d6 --- /dev/null +++ b/sys/lib/libkern/md4c.c @@ -0,0 +1,317 @@ +/* $NetBSD: md4c.c,v 1.1 2000/12/08 06:29:24 deberg Exp $ */ + +/* + * This file is derived from the RSA Data Security, Inc. MD4 Message-Digest + * Algorithm and has been modified by Jason R. Thorpe + * for portability and formatting. + */ + +/* + * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved. + * + * License to copy and use this software is granted provided that it + * is identified as the "RSA Data Security, Inc. MD4 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. MD4 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 +#include + +#include +#include +#include +#endif /* _KERNEL || _STANDALONE */ + +typedef unsigned char *POINTER; +typedef u_int16_t UINT2; +typedef u_int32_t UINT4; + +/* + * Constants for MD4Transform routine. + */ +#define S11 3 +#define S12 7 +#define S13 11 +#define S14 19 +#define S21 3 +#define S22 5 +#define S23 9 +#define S24 13 +#define S31 3 +#define S32 9 +#define S33 11 +#define S34 15 + +static void MD4Transform __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)); + +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 and H are basic MD4 functions. + */ +#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) +#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) +#define H(x, y, z) ((x) ^ (y) ^ (z)) + +/* + * ROTATE_LEFT rotates x left n bits. + */ +#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) + +/* + * FF, GG and HH are transformations for rounds 1, 2 and 3. + * Rotation is separate from addition to prevent recomputation. + */ +#define FF(a, b, c, d, x, s) { \ + (a) += F ((b), (c), (d)) + (x); \ + (a) = ROTATE_LEFT ((a), (s)); \ +} + +#define GG(a, b, c, d, x, s) { \ + (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ + (a) = ROTATE_LEFT ((a), (s)); \ +} + +#define HH(a, b, c, d, x, s) { \ + (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ + (a) = ROTATE_LEFT ((a), (s)); \ +} + +#if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias) +__weak_alias(MD4Init,_MD4Init) +__weak_alias(MD4Update,_MD4Update) +__weak_alias(MD4Final,_MD4Final) +#endif + +/* + * MD4 initialization. Begins an MD4 operation, writing a new context. + */ +void +MD4Init(context) + MD4_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; +} + +/* + * MD4 block update operation. Continues an MD4 message-digest + * operation, processing another message block, and updating the + * context. + */ +void +MD4Update (context, input, inputLen) + MD4_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) { + memcpy(&context->buffer[idx], input, partLen); + MD4Transform(context->state, context->buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) + MD4Transform(context->state, &input[i]); + + idx = 0; + } else + i = 0; + + /* Buffer remaining input */ + memcpy(&context->buffer[idx], &input[i], inputLen - i); +} + +/* + * MD4 finalization. Ends an MD4 message-digest operation, writing the + * message digest and zeroing the context. + */ +void +MD4Final (digest, context) + unsigned char digest[16]; /* message digest */ + MD4_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); + MD4Update(context, PADDING, padLen); + + /* Append length (before padding) */ + MD4Update(context, bits, 8); + + /* Store state in digest */ + Encode(digest, context->state, 16); + + /* Zeroize sensitive information. */ + memset(context, 0, sizeof(*context)); +} + +/* + * MD4 basic transformation. Transforms state based on block. + */ +static void +MD4Transform (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); /* 1 */ + FF (d, a, b, c, x[ 1], S12); /* 2 */ + FF (c, d, a, b, x[ 2], S13); /* 3 */ + FF (b, c, d, a, x[ 3], S14); /* 4 */ + FF (a, b, c, d, x[ 4], S11); /* 5 */ + FF (d, a, b, c, x[ 5], S12); /* 6 */ + FF (c, d, a, b, x[ 6], S13); /* 7 */ + FF (b, c, d, a, x[ 7], S14); /* 8 */ + FF (a, b, c, d, x[ 8], S11); /* 9 */ + FF (d, a, b, c, x[ 9], S12); /* 10 */ + FF (c, d, a, b, x[10], S13); /* 11 */ + FF (b, c, d, a, x[11], S14); /* 12 */ + FF (a, b, c, d, x[12], S11); /* 13 */ + FF (d, a, b, c, x[13], S12); /* 14 */ + FF (c, d, a, b, x[14], S13); /* 15 */ + FF (b, c, d, a, x[15], S14); /* 16 */ + + /* Round 2 */ + GG (a, b, c, d, x[ 0], S21); /* 17 */ + GG (d, a, b, c, x[ 4], S22); /* 18 */ + GG (c, d, a, b, x[ 8], S23); /* 19 */ + GG (b, c, d, a, x[12], S24); /* 20 */ + GG (a, b, c, d, x[ 1], S21); /* 21 */ + GG (d, a, b, c, x[ 5], S22); /* 22 */ + GG (c, d, a, b, x[ 9], S23); /* 23 */ + GG (b, c, d, a, x[13], S24); /* 24 */ + GG (a, b, c, d, x[ 2], S21); /* 25 */ + GG (d, a, b, c, x[ 6], S22); /* 26 */ + GG (c, d, a, b, x[10], S23); /* 27 */ + GG (b, c, d, a, x[14], S24); /* 28 */ + GG (a, b, c, d, x[ 3], S21); /* 29 */ + GG (d, a, b, c, x[ 7], S22); /* 30 */ + GG (c, d, a, b, x[11], S23); /* 31 */ + GG (b, c, d, a, x[15], S24); /* 32 */ + + /* Round 3 */ + HH (a, b, c, d, x[ 0], S31); /* 33 */ + HH (d, a, b, c, x[ 8], S32); /* 34 */ + HH (c, d, a, b, x[ 4], S33); /* 35 */ + HH (b, c, d, a, x[12], S34); /* 36 */ + HH (a, b, c, d, x[ 2], S31); /* 37 */ + HH (d, a, b, c, x[10], S32); /* 38 */ + HH (c, d, a, b, x[ 6], S33); /* 39 */ + HH (b, c, d, a, x[14], S34); /* 40 */ + HH (a, b, c, d, x[ 1], S31); /* 41 */ + HH (d, a, b, c, x[ 9], S32); /* 42 */ + HH (c, d, a, b, x[ 5], S33); /* 43 */ + HH (b, c, d, a, x[13], S34); /* 44 */ + HH (a, b, c, d, x[ 3], S31); /* 45 */ + HH (d, a, b, c, x[11], S32); /* 46 */ + HH (c, d, a, b, x[ 7], S33); /* 47 */ + HH (b, c, d, a, x[15], S34); /* 48 */ + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + + /* Zeroize sensitive information. */ + memset(x, 0, sizeof (x)); +} + +/* + * 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); +} diff --git a/sys/sys/md4.h b/sys/sys/md4.h new file mode 100644 index 000000000000..9174ad8df36f --- /dev/null +++ b/sys/sys/md4.h @@ -0,0 +1,56 @@ +/* $NetBSD: md4.h,v 1.1 2000/12/08 06:29:23 deberg Exp $ */ + +/* + * This file is derived from the RSA Data Security, Inc. MD4 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. MD4 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. MD4 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 _SYS_MD4_H_ +#define _SYS_MD4_H_ + +#include +#include + +/* MD4 context. */ +typedef struct MD4Context { + u_int32_t state[4]; /* state (ABCD) */ + u_int32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */ + unsigned char buffer[64]; /* input buffer */ +} MD4_CTX; + +__BEGIN_DECLS +void MD4Init __P((MD4_CTX *)); +void MD4Update __P((MD4_CTX *, const unsigned char *, unsigned int)); +void MD4Final __P((unsigned char[16], MD4_CTX *)); +#ifndef _KERNEL +char *MD4End __P((MD4_CTX *, char *)); +char *MD4File __P((const char *, char *)); +char *MD4Data __P((const unsigned char *, unsigned int, char *)); +#endif /* _KERNEL */ +__END_DECLS + +#endif /* _SYS_MD4_H_ */