library/md4.c - mirror/mbed-tls - TrustedFirmware Git Browser

 /*
  *  RFC 1186/1320 compliant MD4 implementation
  *
  *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed 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.
  */
 /*
  *  The MD4 algorithm was designed by Ron Rivest in 1990.
  *
  *  http://www.ietf.org/rfc/rfc1186.txt
  *  http://www.ietf.org/rfc/rfc1320.txt
  */

 #include "common.h"

 #if defined(MBEDTLS_MD4_C)

 #include "mbedtls/md4.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/error.h"

 #include <string.h>

 #include "mbedtls/platform.h"

 #if !defined(MBEDTLS_MD4_ALT)

 void mbedtls_md4_init(mbedtls_md4_context *ctx)
 {
     memset(ctx, 0, sizeof(mbedtls_md4_context));
 }

 void mbedtls_md4_free(mbedtls_md4_context *ctx)
 {
     if (ctx == NULL) {
         return;
     }

     mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md4_context));
 }

 void mbedtls_md4_clone(mbedtls_md4_context *dst,
                        const mbedtls_md4_context *src)
 {
     *dst = *src;
 }

 /*
  * MD4 context setup
  */
 int mbedtls_md4_starts_ret(mbedtls_md4_context *ctx)
 {
     ctx->total[0] = 0;
     ctx->total[1] = 0;

     ctx->state[0] = 0x67452301;
     ctx->state[1] = 0xEFCDAB89;
     ctx->state[2] = 0x98BADCFE;
     ctx->state[3] = 0x10325476;

     return 0;
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_starts(mbedtls_md4_context *ctx)
 {
     mbedtls_md4_starts_ret(ctx);
 }
 #endif

 #if !defined(MBEDTLS_MD4_PROCESS_ALT)
 int mbedtls_internal_md4_process(mbedtls_md4_context *ctx,
                                  const unsigned char data[64])
 {
     struct {
         uint32_t X[16], A, B, C, D;
     } local;

     local.X[0] = MBEDTLS_GET_UINT32_LE(data,  0);
     local.X[1] = MBEDTLS_GET_UINT32_LE(data,  4);
     local.X[2] = MBEDTLS_GET_UINT32_LE(data,  8);
     local.X[3] = MBEDTLS_GET_UINT32_LE(data, 12);
     local.X[4] = MBEDTLS_GET_UINT32_LE(data, 16);
     local.X[5] = MBEDTLS_GET_UINT32_LE(data, 20);
     local.X[6] = MBEDTLS_GET_UINT32_LE(data, 24);
     local.X[7] = MBEDTLS_GET_UINT32_LE(data, 28);
     local.X[8] = MBEDTLS_GET_UINT32_LE(data, 32);
     local.X[9] = MBEDTLS_GET_UINT32_LE(data, 36);
     local.X[10] = MBEDTLS_GET_UINT32_LE(data, 40);
     local.X[11] = MBEDTLS_GET_UINT32_LE(data, 44);
     local.X[12] = MBEDTLS_GET_UINT32_LE(data, 48);
     local.X[13] = MBEDTLS_GET_UINT32_LE(data, 52);
     local.X[14] = MBEDTLS_GET_UINT32_LE(data, 56);
     local.X[15] = MBEDTLS_GET_UINT32_LE(data, 60);

 #define S(x, n) (((x) << (n)) | (((x) & 0xFFFFFFFF) >> (32 - (n))))

     local.A = ctx->state[0];
     local.B = ctx->state[1];
     local.C = ctx->state[2];
     local.D = ctx->state[3];

 #define F(x, y, z) (((x) & (y)) | ((~(x)) & (z)))
 #define P(a, b, c, d, x, s)                           \
     do                                           \
     {                                            \
         (a) += F((b), (c), (d)) + (x);             \
         (a) = S((a), (s));                        \
     } while (0)


     P(local.A, local.B, local.C, local.D, local.X[0],  3);
     P(local.D, local.A, local.B, local.C, local.X[1],  7);
     P(local.C, local.D, local.A, local.B, local.X[2], 11);
     P(local.B, local.C, local.D, local.A, local.X[3], 19);
     P(local.A, local.B, local.C, local.D, local.X[4],  3);
     P(local.D, local.A, local.B, local.C, local.X[5],  7);
     P(local.C, local.D, local.A, local.B, local.X[6], 11);
     P(local.B, local.C, local.D, local.A, local.X[7], 19);
     P(local.A, local.B, local.C, local.D, local.X[8],  3);
     P(local.D, local.A, local.B, local.C, local.X[9],  7);
     P(local.C, local.D, local.A, local.B, local.X[10], 11);
     P(local.B, local.C, local.D, local.A, local.X[11], 19);
     P(local.A, local.B, local.C, local.D, local.X[12],  3);
     P(local.D, local.A, local.B, local.C, local.X[13],  7);
     P(local.C, local.D, local.A, local.B, local.X[14], 11);
     P(local.B, local.C, local.D, local.A, local.X[15], 19);

 #undef P
 #undef F

 #define F(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
 #define P(a, b, c, d, x, s)                          \
     do                                          \
     {                                           \
         (a) += F((b), (c), (d)) + (x) + 0x5A827999;       \
         (a) = S((a), (s));                               \
     } while (0)

     P(local.A, local.B, local.C, local.D, local.X[0],  3);
     P(local.D, local.A, local.B, local.C, local.X[4],  5);
     P(local.C, local.D, local.A, local.B, local.X[8],  9);
     P(local.B, local.C, local.D, local.A, local.X[12], 13);
     P(local.A, local.B, local.C, local.D, local.X[1],  3);
     P(local.D, local.A, local.B, local.C, local.X[5],  5);
     P(local.C, local.D, local.A, local.B, local.X[9],  9);
     P(local.B, local.C, local.D, local.A, local.X[13], 13);
     P(local.A, local.B, local.C, local.D, local.X[2],  3);
     P(local.D, local.A, local.B, local.C, local.X[6],  5);
     P(local.C, local.D, local.A, local.B, local.X[10],  9);
     P(local.B, local.C, local.D, local.A, local.X[14], 13);
     P(local.A, local.B, local.C, local.D, local.X[3],  3);
     P(local.D, local.A, local.B, local.C, local.X[7],  5);
     P(local.C, local.D, local.A, local.B, local.X[11],  9);
     P(local.B, local.C, local.D, local.A, local.X[15], 13);

 #undef P
 #undef F

 #define F(x, y, z) ((x) ^ (y) ^ (z))
 #define P(a, b, c, d, x, s)                                  \
     do                                                  \
     {                                                   \
         (a) += F((b), (c), (d)) + (x) + 0x6ED9EBA1;       \
         (a) = S((a), (s));                               \
     } while (0)

     P(local.A, local.B, local.C, local.D, local.X[0],  3);
     P(local.D, local.A, local.B, local.C, local.X[8],  9);
     P(local.C, local.D, local.A, local.B, local.X[4], 11);
     P(local.B, local.C, local.D, local.A, local.X[12], 15);
     P(local.A, local.B, local.C, local.D, local.X[2],  3);
     P(local.D, local.A, local.B, local.C, local.X[10],  9);
     P(local.C, local.D, local.A, local.B, local.X[6], 11);
     P(local.B, local.C, local.D, local.A, local.X[14], 15);
     P(local.A, local.B, local.C, local.D, local.X[1],  3);
     P(local.D, local.A, local.B, local.C, local.X[9],  9);
     P(local.C, local.D, local.A, local.B, local.X[5], 11);
     P(local.B, local.C, local.D, local.A, local.X[13], 15);
     P(local.A, local.B, local.C, local.D, local.X[3],  3);
     P(local.D, local.A, local.B, local.C, local.X[11],  9);
     P(local.C, local.D, local.A, local.B, local.X[7], 11);
     P(local.B, local.C, local.D, local.A, local.X[15], 15);

 #undef F
 #undef P

     ctx->state[0] += local.A;
     ctx->state[1] += local.B;
     ctx->state[2] += local.C;
     ctx->state[3] += local.D;

     /* Zeroise variables to clear sensitive data from memory. */
     mbedtls_platform_zeroize(&local, sizeof(local));

     return 0;
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_process(mbedtls_md4_context *ctx,
                          const unsigned char data[64])
 {
     mbedtls_internal_md4_process(ctx, data);
 }
 #endif
 #endif /* !MBEDTLS_MD4_PROCESS_ALT */

 /*
  * MD4 process buffer
  */
 int mbedtls_md4_update_ret(mbedtls_md4_context *ctx,
                            const unsigned char *input,
                            size_t ilen)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     size_t fill;
     uint32_t left;

     if (ilen == 0) {
         return 0;
     }

     left = ctx->total[0] & 0x3F;
     fill = 64 - left;

     ctx->total[0] += (uint32_t) ilen;
     ctx->total[0] &= 0xFFFFFFFF;

     if (ctx->total[0] < (uint32_t) ilen) {
         ctx->total[1]++;
     }

     if (left && ilen >= fill) {
         memcpy((void *) (ctx->buffer + left),
                (void *) input, fill);

         if ((ret = mbedtls_internal_md4_process(ctx, ctx->buffer)) != 0) {
             return ret;
         }

         input += fill;
         ilen  -= fill;
         left = 0;
     }

     while (ilen >= 64) {
         if ((ret = mbedtls_internal_md4_process(ctx, input)) != 0) {
             return ret;
         }

         input += 64;
         ilen  -= 64;
     }

     if (ilen > 0) {
         memcpy((void *) (ctx->buffer + left),
                (void *) input, ilen);
     }

     return 0;
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_update(mbedtls_md4_context *ctx,
                         const unsigned char *input,
                         size_t ilen)
 {
     mbedtls_md4_update_ret(ctx, input, ilen);
 }
 #endif

 static const unsigned char md4_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
 };

 /*
  * MD4 final digest
  */
 int mbedtls_md4_finish_ret(mbedtls_md4_context *ctx,
                            unsigned char output[16])
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     uint32_t last, padn;
     uint32_t high, low;
     unsigned char msglen[8];

     high = (ctx->total[0] >> 29)
            | (ctx->total[1] <<  3);
     low  = (ctx->total[0] <<  3);

     MBEDTLS_PUT_UINT32_LE(low,  msglen, 0);
     MBEDTLS_PUT_UINT32_LE(high, msglen, 4);

     last = ctx->total[0] & 0x3F;
     padn = (last < 56) ? (56 - last) : (120 - last);

     ret = mbedtls_md4_update_ret(ctx, (unsigned char *) md4_padding, padn);
     if (ret != 0) {
         return ret;
     }

     if ((ret = mbedtls_md4_update_ret(ctx, msglen, 8)) != 0) {
         return ret;
     }


     MBEDTLS_PUT_UINT32_LE(ctx->state[0], output,  0);
     MBEDTLS_PUT_UINT32_LE(ctx->state[1], output,  4);
     MBEDTLS_PUT_UINT32_LE(ctx->state[2], output,  8);
     MBEDTLS_PUT_UINT32_LE(ctx->state[3], output, 12);

     return 0;
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4_finish(mbedtls_md4_context *ctx,
                         unsigned char output[16])
 {
     mbedtls_md4_finish_ret(ctx, output);
 }
 #endif

 #endif /* !MBEDTLS_MD4_ALT */

 /*
  * output = MD4( input buffer )
  */
 int mbedtls_md4_ret(const unsigned char *input,
                     size_t ilen,
                     unsigned char output[16])
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     mbedtls_md4_context ctx;

     mbedtls_md4_init(&ctx);

     if ((ret = mbedtls_md4_starts_ret(&ctx)) != 0) {
         goto exit;
     }

     if ((ret = mbedtls_md4_update_ret(&ctx, input, ilen)) != 0) {
         goto exit;
     }

     if ((ret = mbedtls_md4_finish_ret(&ctx, output)) != 0) {
         goto exit;
     }

 exit:
     mbedtls_md4_free(&ctx);

     return ret;
 }

 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 void mbedtls_md4(const unsigned char *input,
                  size_t ilen,
                  unsigned char output[16])
 {
     mbedtls_md4_ret(input, ilen, output);
 }
 #endif

 #if defined(MBEDTLS_SELF_TEST)

 /*
  * RFC 1320 test vectors
  */
 static const unsigned char md4_test_str[7][81] =
 {
     { "" },
     { "a" },
     { "abc" },
     { "message digest" },
     { "abcdefghijklmnopqrstuvwxyz" },
     { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
     { "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
 };

 static const size_t md4_test_strlen[7] =
 {
     0, 1, 3, 14, 26, 62, 80
 };

 static const unsigned char md4_test_sum[7][16] =
 {
     { 0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
       0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0 },
     { 0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
       0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24 },
     { 0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
       0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D },
     { 0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
       0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B },
     { 0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
       0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9 },
     { 0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
       0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4 },
     { 0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
       0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36 }
 };

 /*
  * Checkup routine
  */
 int mbedtls_md4_self_test(int verbose)
 {
     int i, ret = 0;
     unsigned char md4sum[16];

     for (i = 0; i < 7; i++) {
         if (verbose != 0) {
             mbedtls_printf("  MD4 test #%d: ", i + 1);
         }

         ret = mbedtls_md4_ret(md4_test_str[i], md4_test_strlen[i], md4sum);
         if (ret != 0) {
             goto fail;
         }

         if (memcmp(md4sum, md4_test_sum[i], 16) != 0) {
             ret = 1;
             goto fail;
         }

         if (verbose != 0) {
             mbedtls_printf("passed\n");
         }
     }

     if (verbose != 0) {
         mbedtls_printf("\n");
     }

     return 0;

 fail:
     if (verbose != 0) {
         mbedtls_printf("failed\n");
     }

     return ret;
 }

 #endif /* MBEDTLS_SELF_TEST */

 #endif /* MBEDTLS_MD4_C */
	/*
	* RFC 1186/1320 compliant MD4 implementation
	*
	* Copyright The Mbed TLS Contributors
	* SPDX-License-Identifier: Apache-2.0
	*
	* Licensed 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.
	*/
	/*
	* The MD4 algorithm was designed by Ron Rivest in 1990.
	*
	* http://www.ietf.org/rfc/rfc1186.txt
	* http://www.ietf.org/rfc/rfc1320.txt
	*/

	#include "common.h"

	#if defined(MBEDTLS_MD4_C)

	#include "mbedtls/md4.h"
	#include "mbedtls/platform_util.h"
	#include "mbedtls/error.h"

	#include <string.h>

	#include "mbedtls/platform.h"

	#if !defined(MBEDTLS_MD4_ALT)

	void mbedtls_md4_init(mbedtls_md4_context *ctx)
	{
	memset(ctx, 0, sizeof(mbedtls_md4_context));
	}

	void mbedtls_md4_free(mbedtls_md4_context *ctx)
	{
	if (ctx == NULL) {
	return;
	}

	mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md4_context));
	}

	void mbedtls_md4_clone(mbedtls_md4_context *dst,
	const mbedtls_md4_context *src)
	{
	dst = src;
	}

	/*
	* MD4 context setup
	*/
	int mbedtls_md4_starts_ret(mbedtls_md4_context *ctx)
	{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	ctx->state[0] = 0x67452301;
	ctx->state[1] = 0xEFCDAB89;
	ctx->state[2] = 0x98BADCFE;
	ctx->state[3] = 0x10325476;

	return 0;
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_starts(mbedtls_md4_context *ctx)
	{
	mbedtls_md4_starts_ret(ctx);
	}
	#endif

	#if !defined(MBEDTLS_MD4_PROCESS_ALT)
	int mbedtls_internal_md4_process(mbedtls_md4_context *ctx,
	const unsigned char data[64])
	{
	struct {
	uint32_t X[16], A, B, C, D;
	} local;

	local.X[0] = MBEDTLS_GET_UINT32_LE(data, 0);
	local.X[1] = MBEDTLS_GET_UINT32_LE(data, 4);
	local.X[2] = MBEDTLS_GET_UINT32_LE(data, 8);
	local.X[3] = MBEDTLS_GET_UINT32_LE(data, 12);
	local.X[4] = MBEDTLS_GET_UINT32_LE(data, 16);
	local.X[5] = MBEDTLS_GET_UINT32_LE(data, 20);
	local.X[6] = MBEDTLS_GET_UINT32_LE(data, 24);
	local.X[7] = MBEDTLS_GET_UINT32_LE(data, 28);
	local.X[8] = MBEDTLS_GET_UINT32_LE(data, 32);
	local.X[9] = MBEDTLS_GET_UINT32_LE(data, 36);
	local.X[10] = MBEDTLS_GET_UINT32_LE(data, 40);
	local.X[11] = MBEDTLS_GET_UINT32_LE(data, 44);
	local.X[12] = MBEDTLS_GET_UINT32_LE(data, 48);
	local.X[13] = MBEDTLS_GET_UINT32_LE(data, 52);
	local.X[14] = MBEDTLS_GET_UINT32_LE(data, 56);
	local.X[15] = MBEDTLS_GET_UINT32_LE(data, 60);

	#define S(x, n) (((x) << (n)) \| (((x) & 0xFFFFFFFF) >> (32 - (n))))

	local.A = ctx->state[0];
	local.B = ctx->state[1];
	local.C = ctx->state[2];
	local.D = ctx->state[3];

	#define F(x, y, z) (((x) & (y)) \| ((~(x)) & (z)))
	#define P(a, b, c, d, x, s) \
	do \
	{ \
	(a) += F((b), (c), (d)) + (x); \
	(a) = S((a), (s)); \
	} while (0)


	P(local.A, local.B, local.C, local.D, local.X[0], 3);
	P(local.D, local.A, local.B, local.C, local.X[1], 7);
	P(local.C, local.D, local.A, local.B, local.X[2], 11);
	P(local.B, local.C, local.D, local.A, local.X[3], 19);
	P(local.A, local.B, local.C, local.D, local.X[4], 3);
	P(local.D, local.A, local.B, local.C, local.X[5], 7);
	P(local.C, local.D, local.A, local.B, local.X[6], 11);
	P(local.B, local.C, local.D, local.A, local.X[7], 19);
	P(local.A, local.B, local.C, local.D, local.X[8], 3);
	P(local.D, local.A, local.B, local.C, local.X[9], 7);
	P(local.C, local.D, local.A, local.B, local.X[10], 11);
	P(local.B, local.C, local.D, local.A, local.X[11], 19);
	P(local.A, local.B, local.C, local.D, local.X[12], 3);
	P(local.D, local.A, local.B, local.C, local.X[13], 7);
	P(local.C, local.D, local.A, local.B, local.X[14], 11);
	P(local.B, local.C, local.D, local.A, local.X[15], 19);

	#undef P
	#undef F

	#define F(x, y, z) (((x) & (y)) \| ((x) & (z)) \| ((y) & (z)))
	#define P(a, b, c, d, x, s) \
	do \
	{ \
	(a) += F((b), (c), (d)) + (x) + 0x5A827999; \
	(a) = S((a), (s)); \
	} while (0)

	P(local.A, local.B, local.C, local.D, local.X[0], 3);
	P(local.D, local.A, local.B, local.C, local.X[4], 5);
	P(local.C, local.D, local.A, local.B, local.X[8], 9);
	P(local.B, local.C, local.D, local.A, local.X[12], 13);
	P(local.A, local.B, local.C, local.D, local.X[1], 3);
	P(local.D, local.A, local.B, local.C, local.X[5], 5);
	P(local.C, local.D, local.A, local.B, local.X[9], 9);
	P(local.B, local.C, local.D, local.A, local.X[13], 13);
	P(local.A, local.B, local.C, local.D, local.X[2], 3);
	P(local.D, local.A, local.B, local.C, local.X[6], 5);
	P(local.C, local.D, local.A, local.B, local.X[10], 9);
	P(local.B, local.C, local.D, local.A, local.X[14], 13);
	P(local.A, local.B, local.C, local.D, local.X[3], 3);
	P(local.D, local.A, local.B, local.C, local.X[7], 5);
	P(local.C, local.D, local.A, local.B, local.X[11], 9);
	P(local.B, local.C, local.D, local.A, local.X[15], 13);

	#undef P
	#undef F

	#define F(x, y, z) ((x) ^ (y) ^ (z))
	#define P(a, b, c, d, x, s) \
	do \
	{ \
	(a) += F((b), (c), (d)) + (x) + 0x6ED9EBA1; \
	(a) = S((a), (s)); \
	} while (0)

	P(local.A, local.B, local.C, local.D, local.X[0], 3);
	P(local.D, local.A, local.B, local.C, local.X[8], 9);
	P(local.C, local.D, local.A, local.B, local.X[4], 11);
	P(local.B, local.C, local.D, local.A, local.X[12], 15);
	P(local.A, local.B, local.C, local.D, local.X[2], 3);
	P(local.D, local.A, local.B, local.C, local.X[10], 9);
	P(local.C, local.D, local.A, local.B, local.X[6], 11);
	P(local.B, local.C, local.D, local.A, local.X[14], 15);
	P(local.A, local.B, local.C, local.D, local.X[1], 3);
	P(local.D, local.A, local.B, local.C, local.X[9], 9);
	P(local.C, local.D, local.A, local.B, local.X[5], 11);
	P(local.B, local.C, local.D, local.A, local.X[13], 15);
	P(local.A, local.B, local.C, local.D, local.X[3], 3);
	P(local.D, local.A, local.B, local.C, local.X[11], 9);
	P(local.C, local.D, local.A, local.B, local.X[7], 11);
	P(local.B, local.C, local.D, local.A, local.X[15], 15);

	#undef F
	#undef P

	ctx->state[0] += local.A;
	ctx->state[1] += local.B;
	ctx->state[2] += local.C;
	ctx->state[3] += local.D;

	/* Zeroise variables to clear sensitive data from memory. */
	mbedtls_platform_zeroize(&local, sizeof(local));

	return 0;
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_process(mbedtls_md4_context *ctx,
	const unsigned char data[64])
	{
	mbedtls_internal_md4_process(ctx, data);
	}
	#endif
	#endif /* !MBEDTLS_MD4_PROCESS_ALT */

	/*
	* MD4 process buffer
	*/
	int mbedtls_md4_update_ret(mbedtls_md4_context *ctx,
	const unsigned char *input,
	size_t ilen)
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	size_t fill;
	uint32_t left;

	if (ilen == 0) {
	return 0;
	}

	left = ctx->total[0] & 0x3F;
	fill = 64 - left;

	ctx->total[0] += (uint32_t) ilen;
	ctx->total[0] &= 0xFFFFFFFF;

	if (ctx->total[0] < (uint32_t) ilen) {
	ctx->total[1]++;
	}

	if (left && ilen >= fill) {
	memcpy((void *) (ctx->buffer + left),
	(void *) input, fill);

	if ((ret = mbedtls_internal_md4_process(ctx, ctx->buffer)) != 0) {
	return ret;
	}

	input += fill;
	ilen -= fill;
	left = 0;
	}

	while (ilen >= 64) {
	if ((ret = mbedtls_internal_md4_process(ctx, input)) != 0) {
	return ret;
	}

	input += 64;
	ilen -= 64;
	}

	if (ilen > 0) {
	memcpy((void *) (ctx->buffer + left),
	(void *) input, ilen);
	}

	return 0;
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_update(mbedtls_md4_context *ctx,
	const unsigned char *input,
	size_t ilen)
	{
	mbedtls_md4_update_ret(ctx, input, ilen);
	}
	#endif

	static const unsigned char md4_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
	};

	/*
	* MD4 final digest
	*/
	int mbedtls_md4_finish_ret(mbedtls_md4_context *ctx,
	unsigned char output[16])
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	uint32_t last, padn;
	uint32_t high, low;
	unsigned char msglen[8];

	high = (ctx->total[0] >> 29)
	\| (ctx->total[1] << 3);
	low = (ctx->total[0] << 3);

	MBEDTLS_PUT_UINT32_LE(low, msglen, 0);
	MBEDTLS_PUT_UINT32_LE(high, msglen, 4);

	last = ctx->total[0] & 0x3F;
	padn = (last < 56) ? (56 - last) : (120 - last);

	ret = mbedtls_md4_update_ret(ctx, (unsigned char *) md4_padding, padn);
	if (ret != 0) {
	return ret;
	}

	if ((ret = mbedtls_md4_update_ret(ctx, msglen, 8)) != 0) {
	return ret;
	}


	MBEDTLS_PUT_UINT32_LE(ctx->state[0], output, 0);
	MBEDTLS_PUT_UINT32_LE(ctx->state[1], output, 4);
	MBEDTLS_PUT_UINT32_LE(ctx->state[2], output, 8);
	MBEDTLS_PUT_UINT32_LE(ctx->state[3], output, 12);

	return 0;
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4_finish(mbedtls_md4_context *ctx,
	unsigned char output[16])
	{
	mbedtls_md4_finish_ret(ctx, output);
	}
	#endif

	#endif /* !MBEDTLS_MD4_ALT */

	/*
	* output = MD4( input buffer )
	*/
	int mbedtls_md4_ret(const unsigned char *input,
	size_t ilen,
	unsigned char output[16])
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	mbedtls_md4_context ctx;

	mbedtls_md4_init(&ctx);

	if ((ret = mbedtls_md4_starts_ret(&ctx)) != 0) {
	goto exit;
	}

	if ((ret = mbedtls_md4_update_ret(&ctx, input, ilen)) != 0) {
	goto exit;
	}

	if ((ret = mbedtls_md4_finish_ret(&ctx, output)) != 0) {
	goto exit;
	}

	exit:
	mbedtls_md4_free(&ctx);

	return ret;
	}

	#if !defined(MBEDTLS_DEPRECATED_REMOVED)
	void mbedtls_md4(const unsigned char *input,
	size_t ilen,
	unsigned char output[16])
	{
	mbedtls_md4_ret(input, ilen, output);
	}
	#endif

	#if defined(MBEDTLS_SELF_TEST)

	/*
	* RFC 1320 test vectors
	*/
	static const unsigned char md4_test_str[7][81] =
	{
	{ "" },
	{ "a" },
	{ "abc" },
	{ "message digest" },
	{ "abcdefghijklmnopqrstuvwxyz" },
	{ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" },
	{ "12345678901234567890123456789012345678901234567890123456789012345678901234567890" }
	};

	static const size_t md4_test_strlen[7] =
	{
	0, 1, 3, 14, 26, 62, 80
	};

	static const unsigned char md4_test_sum[7][16] =
	{
	{ 0x31, 0xD6, 0xCF, 0xE0, 0xD1, 0x6A, 0xE9, 0x31,
	0xB7, 0x3C, 0x59, 0xD7, 0xE0, 0xC0, 0x89, 0xC0 },
	{ 0xBD, 0xE5, 0x2C, 0xB3, 0x1D, 0xE3, 0x3E, 0x46,
	0x24, 0x5E, 0x05, 0xFB, 0xDB, 0xD6, 0xFB, 0x24 },
	{ 0xA4, 0x48, 0x01, 0x7A, 0xAF, 0x21, 0xD8, 0x52,
	0x5F, 0xC1, 0x0A, 0xE8, 0x7A, 0xA6, 0x72, 0x9D },
	{ 0xD9, 0x13, 0x0A, 0x81, 0x64, 0x54, 0x9F, 0xE8,
	0x18, 0x87, 0x48, 0x06, 0xE1, 0xC7, 0x01, 0x4B },
	{ 0xD7, 0x9E, 0x1C, 0x30, 0x8A, 0xA5, 0xBB, 0xCD,
	0xEE, 0xA8, 0xED, 0x63, 0xDF, 0x41, 0x2D, 0xA9 },
	{ 0x04, 0x3F, 0x85, 0x82, 0xF2, 0x41, 0xDB, 0x35,
	0x1C, 0xE6, 0x27, 0xE1, 0x53, 0xE7, 0xF0, 0xE4 },
	{ 0xE3, 0x3B, 0x4D, 0xDC, 0x9C, 0x38, 0xF2, 0x19,
	0x9C, 0x3E, 0x7B, 0x16, 0x4F, 0xCC, 0x05, 0x36 }
	};

	/*
	* Checkup routine
	*/
	int mbedtls_md4_self_test(int verbose)
	{
	int i, ret = 0;
	unsigned char md4sum[16];

	for (i = 0; i < 7; i++) {
	if (verbose != 0) {
	mbedtls_printf(" MD4 test #%d: ", i + 1);
	}

	ret = mbedtls_md4_ret(md4_test_str[i], md4_test_strlen[i], md4sum);
	if (ret != 0) {
	goto fail;
	}

	if (memcmp(md4sum, md4_test_sum[i], 16) != 0) {
	ret = 1;
	goto fail;
	}

	if (verbose != 0) {
	mbedtls_printf("passed\n");
	}
	}

	if (verbose != 0) {
	mbedtls_printf("\n");
	}

	return 0;

	fail:
	if (verbose != 0) {
	mbedtls_printf("failed\n");
	}

	return ret;
	}

	#endif /* MBEDTLS_SELF_TEST */

	#endif /* MBEDTLS_MD4_C */