diff options
Diffstat (limited to '')
| -rw-r--r-- | crypto/apr_md4.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/crypto/apr_md4.c b/crypto/apr_md4.c new file mode 100644 index 0000000..9d58193 --- /dev/null +++ b/crypto/apr_md4.c @@ -0,0 +1,409 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * This is derived from material copyright RSA Data Security, Inc. + * Their notice is reproduced below in its entirety. + * + * 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. + */ + +#include "apr_strings.h" +#include "apr_md4.h" +#include "apr_lib.h" +#include "apr_crypto.h" /* for apr_crypto_memzero, if available */ + +#if APR_HAVE_STRING_H +#include <string.h> +#endif +#if APR_HAVE_UNISTD_H +#include <unistd.h> +#endif + +/* 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(apr_uint32_t state[4], const unsigned char block[64]); +static void Encode(unsigned char *output, const apr_uint32_t *input, + unsigned int len); +static void Decode(apr_uint32_t *output, const unsigned char *input, + unsigned int len); + +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 +}; + +#if APR_CHARSET_EBCDIC +static apr_xlate_t *xlate_ebcdic_to_ascii; /* used in apr_md4_encode() */ +#endif + +/* F, G and I 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) + (apr_uint32_t)0x5a827999; \ + (a) = ROTATE_LEFT ((a), (s)); \ + } +#define HH(a, b, c, d, x, s) { \ + (a) += H ((b), (c), (d)) + (x) + (apr_uint32_t)0x6ed9eba1; \ + (a) = ROTATE_LEFT ((a), (s)); \ + } + +/* MD4 initialization. Begins an MD4 operation, writing a new context. + */ +APU_DECLARE(apr_status_t) apr_md4_init(apr_md4_ctx_t *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; + +#if APR_HAS_XLATE + context->xlate = NULL; +#endif + + return APR_SUCCESS; +} + +#if APR_HAS_XLATE +/* MD4 translation setup. Provides the APR translation handle + * to be used for translating the content before calculating the + * digest. + */ +APU_DECLARE(apr_status_t) apr_md4_set_xlate(apr_md4_ctx_t *context, + apr_xlate_t *xlate) +{ + apr_status_t rv; + int is_sb; + + /* TODO: remove the single-byte-only restriction from this code + */ + rv = apr_xlate_sb_get(xlate, &is_sb); + if (rv != APR_SUCCESS) { + return rv; + } + if (!is_sb) { + return APR_EINVAL; + } + context->xlate = xlate; + return APR_SUCCESS; +} +#endif /* APR_HAS_XLATE */ + +/* MD4 block update operation. Continues an MD4 message-digest + * operation, processing another message block, and updating the + * context. + */ +APU_DECLARE(apr_status_t) apr_md4_update(apr_md4_ctx_t *context, + const unsigned char *input, + apr_size_t inputLen) +{ + unsigned int i, idx, partLen; +#if APR_HAS_XLATE + apr_size_t inbytes_left, outbytes_left; +#endif + + /* Compute number of bytes mod 64 */ + idx = (unsigned int)((context->count[0] >> 3) & 0x3F); + + /* Update number of bits */ + if ((context->count[0] += ((apr_uint32_t)inputLen << 3)) + < ((apr_uint32_t)inputLen << 3)) + context->count[1]++; + context->count[1] += (apr_uint32_t)inputLen >> 29; + + partLen = 64 - idx; + + /* Transform as many times as possible. */ +#if !APR_HAS_XLATE + 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); +#else /*APR_HAS_XLATE*/ + if (inputLen >= partLen) { + if (context->xlate) { + inbytes_left = outbytes_left = partLen; + apr_xlate_conv_buffer(context->xlate, (const char *)input, + &inbytes_left, + (char *)&context->buffer[idx], + &outbytes_left); + } + else { + memcpy(&context->buffer[idx], input, partLen); + } + MD4Transform(context->state, context->buffer); + + for (i = partLen; i + 63 < inputLen; i += 64) { + if (context->xlate) { + unsigned char inp_tmp[64]; + inbytes_left = outbytes_left = 64; + apr_xlate_conv_buffer(context->xlate, (const char *)&input[i], + &inbytes_left, + (char *)inp_tmp, &outbytes_left); + MD4Transform(context->state, inp_tmp); + } + else { + MD4Transform(context->state, &input[i]); + } + } + + idx = 0; + } + else + i = 0; + + /* Buffer remaining input */ + if (context->xlate) { + inbytes_left = outbytes_left = inputLen - i; + apr_xlate_conv_buffer(context->xlate, (const char *)&input[i], + &inbytes_left, (char *)&context->buffer[idx], + &outbytes_left); + } + else { + memcpy(&context->buffer[idx], &input[i], inputLen - i); + } +#endif /*APR_HAS_XLATE*/ + return APR_SUCCESS; +} + +/* MD4 finalization. Ends an MD4 message-digest operation, writing the + * the message digest and zeroizing the context. + */ +APU_DECLARE(apr_status_t) apr_md4_final( + unsigned char digest[APR_MD4_DIGESTSIZE], + apr_md4_ctx_t *context) +{ + unsigned char bits[8]; + unsigned int idx, padLen; + + /* Save number of bits */ + Encode(bits, context->count, 8); + +#if APR_HAS_XLATE + /* apr_md4_update() should not translate for this final round. */ + context->xlate = NULL; +#endif /*APR_HAS_XLATE*/ + + /* Pad out to 56 mod 64. */ + idx = (unsigned int) ((context->count[0] >> 3) & 0x3f); + padLen = (idx < 56) ? (56 - idx) : (120 - idx); + apr_md4_update(context, PADDING, padLen); + + /* Append length (before padding) */ + apr_md4_update(context, bits, 8); + + /* Store state in digest */ + Encode(digest, context->state, APR_MD4_DIGESTSIZE); + + /* Zeroize sensitive information. */ + memset(context, 0, sizeof(*context)); + + return APR_SUCCESS; +} + +/* MD4 computation in one step (init, update, final) + */ +APU_DECLARE(apr_status_t) apr_md4(unsigned char digest[APR_MD4_DIGESTSIZE], + const unsigned char *input, + apr_size_t inputLen) +{ + apr_md4_ctx_t ctx; + apr_status_t rv; + + apr_md4_init(&ctx); + + if ((rv = apr_md4_update(&ctx, input, inputLen)) != APR_SUCCESS) + return rv; + + return apr_md4_final(digest, &ctx); +} + +/* MD4 basic transformation. Transforms state based on block. */ +static void MD4Transform(apr_uint32_t state[4], const unsigned char block[64]) +{ + apr_uint32_t a = state[0], b = state[1], c = state[2], d = state[3], + x[APR_MD4_DIGESTSIZE]; + + 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. */ +#if APU_HAVE_CRYPTO + apr_crypto_memzero(x, sizeof(x)); +#else + memset(x, 0, sizeof(x)); +#endif +} + +/* Encodes input (apr_uint32_t) into output (unsigned char). Assumes len is + * a multiple of 4. + */ +static void Encode(unsigned char *output, const apr_uint32_t *input, + unsigned int len) +{ + unsigned int i, j; + apr_uint32_t k; + + for (i = 0, j = 0; j < len; i++, j += 4) { + k = input[i]; + output[j] = (unsigned char)(k & 0xff); + output[j + 1] = (unsigned char)((k >> 8) & 0xff); + output[j + 2] = (unsigned char)((k >> 16) & 0xff); + output[j + 3] = (unsigned char)((k >> 24) & 0xff); + } +} + +/* Decodes input (unsigned char) into output (apr_uint32_t). Assumes len is + * a multiple of 4. + */ +static void Decode(apr_uint32_t *output, const unsigned char *input, + unsigned int len) +{ + unsigned int i, j; + + for (i = 0, j = 0; j < len; i++, j += 4) + output[i] = ((apr_uint32_t)input[j]) | + (((apr_uint32_t)input[j + 1]) << 8) | + (((apr_uint32_t)input[j + 2]) << 16) | + (((apr_uint32_t)input[j + 3]) << 24); +} + +#if APR_CHARSET_EBCDIC +APU_DECLARE(apr_status_t) apr_MD4InitEBCDIC(apr_xlate_t *xlate) +{ + xlate_ebcdic_to_ascii = xlate; + return APR_SUCCESS; +} +#endif |