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Diffstat (limited to 'contrib/opie/libopie/md4c.c')
| -rw-r--r-- | contrib/opie/libopie/md4c.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/contrib/opie/libopie/md4c.c b/contrib/opie/libopie/md4c.c new file mode 100644 index 0000000..fd46857 --- /dev/null +++ b/contrib/opie/libopie/md4c.c @@ -0,0 +1,267 @@ +/* md4c.c: "RSA Data Security, Inc. MD4 Message-Digest Algorithm" + +%%% portions-copyright-cmetz +Portions of this software are Copyright 1996 by Craig Metz, All Rights +Reserved. The Inner Net License Version 2 applies to these portions of +the software. +You should have received a copy of the license with this software. If +you didn't get a copy, you may request one from <license@inner.net>. + +Portions of this software are Copyright 1995 by Randall Atkinson and Dan +McDonald, All Rights Reserved. All Rights under this copyright are assigned +to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and +License Agreement applies to this software. + + History: + + Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al. + Use the real memcpy() and memset(). Use unified context + structure. + Modified at NRL for OPIE 2.0. + Originally from RSADSI reference code. +*/ +/* 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. + */ + +#include "opie_cfg.h" +#include "opie.h" + +/* 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 VOIDRET MD4Transform __P((UINT4[4], unsigned char[64])); +static VOIDRET Encode __P((unsigned char *, UINT4 *, unsigned int)); +static VOIDRET Decode __P((UINT4 *, unsigned char *, unsigned int)); + +static 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)); \ + } + +/* MD4 initialization. Begins an MD4 operation, writing a new context. + */ +VOIDRET opiemd4init FUNCTION((context), struct opiemdx_ctx *context) +{ + 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. + */ +VOIDRET opiemd4update FUNCTION((context, input, inputLen), struct opiemdx_ctx *context AND unsigned char *input AND unsigned int inputLen) +{ + unsigned int i, index, partLen; + + /* Compute number of bytes mod 64 */ + index = (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 - index; + + /* Transform as many times as possible. */ + if (inputLen >= partLen) { + memcpy((POINTER) & context->buffer[index], (POINTER) input, partLen); + MD4Transform(context->state, context->buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) + MD4Transform(context->state, &input[i]); + + index = 0; + } else + i = 0; + + /* Buffer remaining input */ + memcpy((POINTER) & context->buffer[index], (POINTER) & input[i], inputLen - i); +} + +/* MD4 finalization. Ends an MD4 message-digest operation, writing the + the message digest and zeroizing the context. + */ +VOIDRET opiemd4final FUNCTION((digest, context), unsigned char *digest AND struct opiemdx_ctx *context) +{ + unsigned char bits[8]; + unsigned int index, padLen; + + /* Save number of bits */ + Encode(bits, context->count, 8); + + /* Pad out to 56 mod 64. */ + index = (unsigned int) ((context->count[0] >> 3) & 0x3f); + padLen = (index < 56) ? (56 - index) : (120 - index); + opiemd4update(context, PADDING, padLen); + + /* Append length (before padding) */ + opiemd4update(context, bits, 8); + /* Store state in digest */ + Encode(digest, context->state, 16); + + /* Zeroize sensitive information. */ + memset((POINTER) context, 0, sizeof(*context)); +} + +/* MD4 basic transformation. Transforms state based on block. + */ +static VOIDRET MD4Transform FUNCTION((state, block), UINT4 state[4] AND 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((POINTER) x, 0, sizeof(x)); +} + +/* Encodes input (UINT4) into output (unsigned char). Assumes len is + a multiple of 4. + */ +static VOIDRET Encode FUNCTION((output, input, len), unsigned char *output AND UINT4 *input AND 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 VOIDRET Decode FUNCTION((output, input, len), UINT4 *output AND unsigned char *input AND 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); +} |
