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+/* 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"
+
+#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. */
+ memset(x, 0, sizeof(x));
+}
+
+/* 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
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