216 lines
7.3 KiB
C
216 lines
7.3 KiB
C
/* MD2C.C - RSA Data Security, Inc., MD2 message-digest algorithm
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*/
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/***********************************************************
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* WICHTIG:
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* Diese Implementierung wurde nicht von uns geschrieben,
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* sondern zu vergleichszwechen von der Referenz übernommen.
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* Quelle: https://datatracker.ietf.org/doc/html/rfc1319
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**********************************************************/
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/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
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rights reserved.
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License to copy and use this software is granted for
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non-commercial Internet Privacy-Enhanced Mail provided that it is
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identified as the "RSA Data Security, Inc. MD2 Message Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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#include "../../../lib/md2_impls/md2_reference/md2_reference.h"
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static void MD2Transform PROTO_LIST((unsigned char[16], unsigned char[16],
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unsigned char[16]));
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static void MD2_memcpy PROTO_LIST((POINTER, POINTER, size_t));
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static void MD2_memset PROTO_LIST((POINTER, int, size_t));
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/* Permutation of 0..255 constructed from the digits of pi. It gives a
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"random" nonlinear byte substitution operation.
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*/
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static unsigned char PI_SUBST[256] = {
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41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
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19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76,
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130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138,
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23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142,
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187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16,
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137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62,
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204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215,
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94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182,
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118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135,
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32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176,
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185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221,
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81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110,
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133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55,
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200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136,
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149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242,
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239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
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49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131,
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20};
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static unsigned char *PADDING[] = {
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(unsigned char *)"",
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(unsigned char *)"\001",
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(unsigned char *)"\002\002",
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(unsigned char *)"\003\003\003",
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(unsigned char *)"\004\004\004\004",
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(unsigned char *)"\005\005\005\005\005",
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(unsigned char *)"\006\006\006\006\006\006",
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(unsigned char *)"\007\007\007\007\007\007\007",
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(unsigned char *)"\010\010\010\010\010\010\010\010",
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(unsigned char *)"\011\011\011\011\011\011\011\011\011",
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(unsigned char *)"\012\012\012\012\012\012\012\012\012\012",
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(unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013",
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(unsigned char *)"\014\014\014\014\014\014\014\014\014\014\014\014",
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(unsigned char *)"\015\015\015\015\015\015\015\015\015\015\015\015\015",
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(unsigned char *)"\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
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(unsigned char
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*)"\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
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(unsigned char
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*)"\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"};
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void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]) {
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MD2_CTX context;
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MD2Init(&context);
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MD2Update(&context, buf, len);
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MD2Final(out, &context);
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}
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/* MD2 initialization. Begins an MD2 operation, writing a new context.
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*/
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void MD2Init(context) MD2_CTX *context; /* context */
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{
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context->count = 0;
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MD2_memset((POINTER)context->state, 0, sizeof(context->state));
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MD2_memset((POINTER)context->checksum, 0, sizeof(context->checksum));
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}
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/* MD2 block update operation. Continues an MD2 message-digest
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operation, processing another message block, and updating the
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context.
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*/
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void MD2Update(context, input, inputLen) MD2_CTX *context; /* context */
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unsigned char *input; /* input block */
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size_t inputLen; /* length of input block */
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{
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size_t i, index, partLen;
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/* Update number of bytes mod 16 */
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index = context->count;
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context->count = (index + inputLen) & 0xf;
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partLen = 16 - index;
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/* Transform as many times as possible.
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*/
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if (inputLen >= partLen) {
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MD2_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
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MD2Transform(context->state, context->checksum, context->buffer);
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for (i = partLen; i + 15 < inputLen; i += 16)
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MD2Transform(context->state, context->checksum, &input[i]);
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index = 0;
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} else
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i = 0;
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/* Buffer remaining input */
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MD2_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],
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inputLen - i);
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}
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/* MD2 finalization. Ends an MD2 message-digest operation, writing the
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message digest and zeroizing the context.
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*/
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void MD2Final(digest, context)
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unsigned char digest[16]; /* message digest */
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MD2_CTX *context; /* context */
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{
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size_t index, padLen;
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/* Pad out to multiple of 16.
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*/
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index = context->count;
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padLen = 16 - index;
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MD2Update(context, PADDING[padLen], padLen);
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/* Extend with checksum */
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MD2Update(context, context->checksum, 16);
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/* Store state in digest */
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MD2_memcpy((POINTER)digest, (POINTER)context->state, 16);
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/* Zeroize sensitive information.
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*/
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MD2_memset((POINTER)context, 0, sizeof(*context));
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}
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/* MD2 basic transformation. Transforms state and updates checksum
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based on block.
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*/
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static void MD2Transform(state, checksum, block) unsigned char state[16];
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unsigned char checksum[16];
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unsigned char block[16];
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{
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size_t i, j, t;
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unsigned char x[48];
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/* Form encryption block from state, block, state ^ block.
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*/
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MD2_memcpy((POINTER)x, (POINTER)state, 16);
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MD2_memcpy((POINTER)x + 16, (POINTER)block, 16);
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for (i = 0; i < 16; i++) x[i + 32] = state[i] ^ block[i];
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/* Encrypt block (18 rounds).
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*/
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t = 0;
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for (i = 0; i < 18; i++) {
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for (j = 0; j < 48; j++) t = x[j] ^= PI_SUBST[t];
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t = (t + i) & 0xff;
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}
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/* Save new state */
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MD2_memcpy((POINTER)state, (POINTER)x, 16);
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/* Update checksum.
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*/
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t = checksum[15];
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for (i = 0; i < 16; i++) t = checksum[i] ^= PI_SUBST[block[i] ^ t];
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/* Zeroize sensitive information.
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*/
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MD2_memset((POINTER)x, 0, sizeof(x));
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}
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/* Note: Replace "for loop" with standard memcpy if possible.
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*/
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static void MD2_memcpy(output, input, len) POINTER output;
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POINTER input;
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size_t len;
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{
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size_t i;
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for (i = 0; i < len; i++) output[i] = input[i];
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}
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/* Note: Replace "for loop" with standard memset if possible.
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*/
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static void MD2_memset(output, value, len) POINTER output;
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int value;
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size_t len;
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{
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size_t i;
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for (i = 0; i < len; i++) ((char *)output)[i] = (char)value;
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}
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