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

 /**
  * \file md.c
  *
  * \brief Generic message digest wrapper for mbed TLS
  *
  * \author Adriaan de Jong <dejong@fox-it.com>
  *
  *  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.
  */

 #include "common.h"

 #if defined(MBEDTLS_MD_C)

 #    include "mbedtls/md.h"
 #    include "md_wrap.h"
 #    include "mbedtls/platform_util.h"
 #    include "mbedtls/error.h"

 #    include "mbedtls/md5.h"
 #    include "mbedtls/ripemd160.h"
 #    include "mbedtls/sha1.h"
 #    include "mbedtls/sha256.h"
 #    include "mbedtls/sha512.h"

 #    if defined(MBEDTLS_PLATFORM_C)
 #        include "mbedtls/platform.h"
 #    else
 #        include <stdlib.h>
 #        define mbedtls_calloc calloc
 #        define mbedtls_free   free
 #    endif

 #    include <string.h>

 #    if defined(MBEDTLS_FS_IO)
 #        include <stdio.h>
 #    endif

 #    if defined(MBEDTLS_MD5_C)
 const mbedtls_md_info_t mbedtls_md5_info = {
     "MD5",
     MBEDTLS_MD_MD5,
     16,
     64,
 };
 #    endif

 #    if defined(MBEDTLS_RIPEMD160_C)
 const mbedtls_md_info_t mbedtls_ripemd160_info = {
     "RIPEMD160",
     MBEDTLS_MD_RIPEMD160,
     20,
     64,
 };
 #    endif

 #    if defined(MBEDTLS_SHA1_C)
 const mbedtls_md_info_t mbedtls_sha1_info = {
     "SHA1",
     MBEDTLS_MD_SHA1,
     20,
     64,
 };
 #    endif

 #    if defined(MBEDTLS_SHA224_C)
 const mbedtls_md_info_t mbedtls_sha224_info = {
     "SHA224",
     MBEDTLS_MD_SHA224,
     28,
     64,
 };
 #    endif

 #    if defined(MBEDTLS_SHA256_C)
 const mbedtls_md_info_t mbedtls_sha256_info = {
     "SHA256",
     MBEDTLS_MD_SHA256,
     32,
     64,
 };
 #    endif

 #    if defined(MBEDTLS_SHA384_C)
 const mbedtls_md_info_t mbedtls_sha384_info = {
     "SHA384",
     MBEDTLS_MD_SHA384,
     48,
     128,
 };
 #    endif

 #    if defined(MBEDTLS_SHA512_C)
 const mbedtls_md_info_t mbedtls_sha512_info = {
     "SHA512",
     MBEDTLS_MD_SHA512,
     64,
     128,
 };
 #    endif

 /*
  * Reminder: update profiles in x509_crt.c when adding a new hash!
  */
 static const int supported_digests[] = {

 #    if defined(MBEDTLS_SHA512_C)
     MBEDTLS_MD_SHA512,
 #    endif

 #    if defined(MBEDTLS_SHA384_C)
     MBEDTLS_MD_SHA384,
 #    endif

 #    if defined(MBEDTLS_SHA256_C)
     MBEDTLS_MD_SHA256,
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
     MBEDTLS_MD_SHA224,
 #    endif

 #    if defined(MBEDTLS_SHA1_C)
     MBEDTLS_MD_SHA1,
 #    endif

 #    if defined(MBEDTLS_RIPEMD160_C)
     MBEDTLS_MD_RIPEMD160,
 #    endif

 #    if defined(MBEDTLS_MD5_C)
     MBEDTLS_MD_MD5,
 #    endif

     MBEDTLS_MD_NONE
 };

 const int *mbedtls_md_list(void)
 {
     return supported_digests;
 }

 const mbedtls_md_info_t *mbedtls_md_info_from_string(const char *md_name)
 {
     if (NULL == md_name)
         return NULL;

         /* Get the appropriate digest information */
 #    if defined(MBEDTLS_MD5_C)
     if (!strcmp("MD5", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_MD5);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
     if (!strcmp("RIPEMD160", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_RIPEMD160);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
     if (!strcmp("SHA1", md_name) || !strcmp("SHA", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
     if (!strcmp("SHA224", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_SHA224);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
     if (!strcmp("SHA256", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
     if (!strcmp("SHA384", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
     if (!strcmp("SHA512", md_name))
         return mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
 #    endif
     return NULL;
 }

 const mbedtls_md_info_t *mbedtls_md_info_from_type(mbedtls_md_type_t md_type)
 {
     switch (md_type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return &mbedtls_md5_info;
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return &mbedtls_ripemd160_info;
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return &mbedtls_sha1_info;
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return &mbedtls_sha224_info;
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return &mbedtls_sha256_info;
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return &mbedtls_sha384_info;
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return &mbedtls_sha512_info;
 #    endif
         default:
             return NULL;
     }
 }

 void mbedtls_md_init(mbedtls_md_context_t *ctx)
 {
     memset(ctx, 0, sizeof(mbedtls_md_context_t));
 }

 void mbedtls_md_free(mbedtls_md_context_t *ctx)
 {
     if (ctx == NULL || ctx->md_info == NULL)
         return;

     if (ctx->md_ctx != NULL) {
         switch (ctx->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
             case MBEDTLS_MD_MD5:
                 mbedtls_md5_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
             case MBEDTLS_MD_RIPEMD160:
                 mbedtls_ripemd160_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
             case MBEDTLS_MD_SHA1:
                 mbedtls_sha1_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
             case MBEDTLS_MD_SHA224:
                 mbedtls_sha256_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
             case MBEDTLS_MD_SHA256:
                 mbedtls_sha256_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
             case MBEDTLS_MD_SHA384:
                 mbedtls_sha512_free(ctx->md_ctx);
                 break;
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
             case MBEDTLS_MD_SHA512:
                 mbedtls_sha512_free(ctx->md_ctx);
                 break;
 #    endif
             default:
                 /* Shouldn't happen */
                 break;
         }
         mbedtls_free(ctx->md_ctx);
     }

     if (ctx->hmac_ctx != NULL) {
         mbedtls_platform_zeroize(ctx->hmac_ctx, 2 * ctx->md_info->block_size);
         mbedtls_free(ctx->hmac_ctx);
     }

     mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md_context_t));
 }

 int mbedtls_md_clone(mbedtls_md_context_t *dst, const mbedtls_md_context_t *src)
 {
     if (dst == NULL || dst->md_info == NULL || src == NULL ||
         src->md_info == NULL || dst->md_info != src->md_info) {
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }

     switch (src->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             mbedtls_md5_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             mbedtls_ripemd160_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             mbedtls_sha1_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             mbedtls_sha256_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             mbedtls_sha256_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             mbedtls_sha512_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             mbedtls_sha512_clone(dst->md_ctx, src->md_ctx);
             break;
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }

     return 0;
 }

 #    define ALLOC(type)                                                        \
         do {                                                                   \
             ctx->md_ctx = mbedtls_calloc(1, sizeof(mbedtls_##type##_context)); \
             if (ctx->md_ctx == NULL)                                           \
                 return MBEDTLS_ERR_MD_ALLOC_FAILED;                            \
             mbedtls_##type##_init(ctx->md_ctx);                                \
         } while (0)

 int mbedtls_md_setup(mbedtls_md_context_t *ctx,
                      const mbedtls_md_info_t *md_info,
                      int hmac)
 {
     if (md_info == NULL || ctx == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     ctx->md_info = md_info;
     ctx->md_ctx = NULL;
     ctx->hmac_ctx = NULL;

     switch (md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             ALLOC(md5);
             break;
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             ALLOC(ripemd160);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             ALLOC(sha1);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             ALLOC(sha256);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             ALLOC(sha256);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             ALLOC(sha512);
             break;
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             ALLOC(sha512);
             break;
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }

     if (hmac != 0) {
         ctx->hmac_ctx = mbedtls_calloc(2, md_info->block_size);
         if (ctx->hmac_ctx == NULL) {
             mbedtls_md_free(ctx);
             return MBEDTLS_ERR_MD_ALLOC_FAILED;
         }
     }

     return 0;
 }
 #    undef ALLOC

 int mbedtls_md_starts(mbedtls_md_context_t *ctx)
 {
     if (ctx == NULL || ctx->md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     switch (ctx->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return mbedtls_md5_starts(ctx->md_ctx);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return mbedtls_ripemd160_starts(ctx->md_ctx);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return mbedtls_sha1_starts(ctx->md_ctx);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return mbedtls_sha256_starts(ctx->md_ctx, 1);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return mbedtls_sha256_starts(ctx->md_ctx, 0);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return mbedtls_sha512_starts(ctx->md_ctx, 1);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return mbedtls_sha512_starts(ctx->md_ctx, 0);
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }
 }

 int mbedtls_md_update(mbedtls_md_context_t *ctx,
                       const unsigned char *input,
                       size_t ilen)
 {
     if (ctx == NULL || ctx->md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     switch (ctx->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return mbedtls_md5_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return mbedtls_ripemd160_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return mbedtls_sha1_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return mbedtls_sha256_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return mbedtls_sha256_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return mbedtls_sha512_update(ctx->md_ctx, input, ilen);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return mbedtls_sha512_update(ctx->md_ctx, input, ilen);
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }
 }

 int mbedtls_md_finish(mbedtls_md_context_t *ctx, unsigned char *output)
 {
     if (ctx == NULL || ctx->md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     switch (ctx->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return mbedtls_md5_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return mbedtls_ripemd160_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return mbedtls_sha1_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return mbedtls_sha256_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return mbedtls_sha256_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return mbedtls_sha512_finish(ctx->md_ctx, output);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return mbedtls_sha512_finish(ctx->md_ctx, output);
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }
 }

 int mbedtls_md(const mbedtls_md_info_t *md_info,
                const unsigned char *input,
                size_t ilen,
                unsigned char *output)
 {
     if (md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     switch (md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return mbedtls_md5(input, ilen, output);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return mbedtls_ripemd160(input, ilen, output);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return mbedtls_sha1(input, ilen, output);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return mbedtls_sha256(input, ilen, output, 1);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return mbedtls_sha256(input, ilen, output, 0);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return mbedtls_sha512(input, ilen, output, 1);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return mbedtls_sha512(input, ilen, output, 0);
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }
 }

 #    if defined(MBEDTLS_FS_IO)
 int mbedtls_md_file(const mbedtls_md_info_t *md_info,
                     const char *path,
                     unsigned char *output)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     FILE *f;
     size_t n;
     mbedtls_md_context_t ctx;
     unsigned char buf[1024];

     if (md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     if ((f = fopen(path, "rb")) == NULL)
         return MBEDTLS_ERR_MD_FILE_IO_ERROR;

     mbedtls_md_init(&ctx);

     if ((ret = mbedtls_md_setup(&ctx, md_info, 0)) != 0)
         goto cleanup;

     if ((ret = mbedtls_md_starts(&ctx)) != 0)
         goto cleanup;

     while ((n = fread(buf, 1, sizeof(buf), f)) > 0)
         if ((ret = mbedtls_md_update(&ctx, buf, n)) != 0)
             goto cleanup;

     if (ferror(f) != 0)
         ret = MBEDTLS_ERR_MD_FILE_IO_ERROR;
     else
         ret = mbedtls_md_finish(&ctx, output);

 cleanup:
     mbedtls_platform_zeroize(buf, sizeof(buf));
     fclose(f);
     mbedtls_md_free(&ctx);

     return ret;
 }
 #    endif /* MBEDTLS_FS_IO */

 int mbedtls_md_hmac_starts(mbedtls_md_context_t *ctx,
                            const unsigned char *key,
                            size_t keylen)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char sum[MBEDTLS_MD_MAX_SIZE];
     unsigned char *ipad, *opad;
     size_t i;

     if (ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     if (keylen > (size_t)ctx->md_info->block_size) {
         if ((ret = mbedtls_md_starts(ctx)) != 0)
             goto cleanup;
         if ((ret = mbedtls_md_update(ctx, key, keylen)) != 0)
             goto cleanup;
         if ((ret = mbedtls_md_finish(ctx, sum)) != 0)
             goto cleanup;

         keylen = ctx->md_info->size;
         key = sum;
     }

     ipad = (unsigned char *)ctx->hmac_ctx;
     opad = (unsigned char *)ctx->hmac_ctx + ctx->md_info->block_size;

     memset(ipad, 0x36, ctx->md_info->block_size);
     memset(opad, 0x5C, ctx->md_info->block_size);

     for (i = 0; i < keylen; i++) {
         ipad[i] = (unsigned char)(ipad[i] ^ key[i]);
         opad[i] = (unsigned char)(opad[i] ^ key[i]);
     }

     if ((ret = mbedtls_md_starts(ctx)) != 0)
         goto cleanup;
     if ((ret = mbedtls_md_update(ctx, ipad, ctx->md_info->block_size)) != 0)
         goto cleanup;

 cleanup:
     mbedtls_platform_zeroize(sum, sizeof(sum));

     return ret;
 }

 int mbedtls_md_hmac_update(mbedtls_md_context_t *ctx,
                            const unsigned char *input,
                            size_t ilen)
 {
     if (ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     return mbedtls_md_update(ctx, input, ilen);
 }

 int mbedtls_md_hmac_finish(mbedtls_md_context_t *ctx, unsigned char *output)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char tmp[MBEDTLS_MD_MAX_SIZE];
     unsigned char *opad;

     if (ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     opad = (unsigned char *)ctx->hmac_ctx + ctx->md_info->block_size;

     if ((ret = mbedtls_md_finish(ctx, tmp)) != 0)
         return ret;
     if ((ret = mbedtls_md_starts(ctx)) != 0)
         return ret;
     if ((ret = mbedtls_md_update(ctx, opad, ctx->md_info->block_size)) != 0)
         return ret;
     if ((ret = mbedtls_md_update(ctx, tmp, ctx->md_info->size)) != 0)
         return ret;
     return mbedtls_md_finish(ctx, output);
 }

 int mbedtls_md_hmac_reset(mbedtls_md_context_t *ctx)
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char *ipad;

     if (ctx == NULL || ctx->md_info == NULL || ctx->hmac_ctx == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     ipad = (unsigned char *)ctx->hmac_ctx;

     if ((ret = mbedtls_md_starts(ctx)) != 0)
         return ret;
     return mbedtls_md_update(ctx, ipad, ctx->md_info->block_size);
 }

 int mbedtls_md_hmac(const mbedtls_md_info_t *md_info,
                     const unsigned char *key,
                     size_t keylen,
                     const unsigned char *input,
                     size_t ilen,
                     unsigned char *output)
 {
     mbedtls_md_context_t ctx;
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

     if (md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     mbedtls_md_init(&ctx);

     if ((ret = mbedtls_md_setup(&ctx, md_info, 1)) != 0)
         goto cleanup;

     if ((ret = mbedtls_md_hmac_starts(&ctx, key, keylen)) != 0)
         goto cleanup;
     if ((ret = mbedtls_md_hmac_update(&ctx, input, ilen)) != 0)
         goto cleanup;
     if ((ret = mbedtls_md_hmac_finish(&ctx, output)) != 0)
         goto cleanup;

 cleanup:
     mbedtls_md_free(&ctx);

     return ret;
 }

 int mbedtls_md_process(mbedtls_md_context_t *ctx, const unsigned char *data)
 {
     if (ctx == NULL || ctx->md_info == NULL)
         return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

     switch (ctx->md_info->type) {
 #    if defined(MBEDTLS_MD5_C)
         case MBEDTLS_MD_MD5:
             return mbedtls_internal_md5_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_RIPEMD160_C)
         case MBEDTLS_MD_RIPEMD160:
             return mbedtls_internal_ripemd160_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_SHA1_C)
         case MBEDTLS_MD_SHA1:
             return mbedtls_internal_sha1_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_SHA224_C)
         case MBEDTLS_MD_SHA224:
             return mbedtls_internal_sha256_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_SHA256_C)
         case MBEDTLS_MD_SHA256:
             return mbedtls_internal_sha256_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_SHA384_C)
         case MBEDTLS_MD_SHA384:
             return mbedtls_internal_sha512_process(ctx->md_ctx, data);
 #    endif
 #    if defined(MBEDTLS_SHA512_C)
         case MBEDTLS_MD_SHA512:
             return mbedtls_internal_sha512_process(ctx->md_ctx, data);
 #    endif
         default:
             return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
     }
 }

 unsigned char mbedtls_md_get_size(const mbedtls_md_info_t *md_info)
 {
     if (md_info == NULL)
         return 0;

     return md_info->size;
 }

 mbedtls_md_type_t mbedtls_md_get_type(const mbedtls_md_info_t *md_info)
 {
     if (md_info == NULL)
         return MBEDTLS_MD_NONE;

     return md_info->type;
 }

 const char *mbedtls_md_get_name(const mbedtls_md_info_t *md_info)
 {
     if (md_info == NULL)
         return NULL;

     return md_info->name;
 }

 #endif /* MBEDTLS_MD_C */
	/**
	* \file md.c
	*
	* \brief Generic message digest wrapper for mbed TLS
	*
	* \author Adriaan de Jong <dejong@fox-it.com>
	*
	* 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.
	*/

	#include "common.h"

	#if defined(MBEDTLS_MD_C)

	# include "mbedtls/md.h"
	# include "md_wrap.h"
	# include "mbedtls/platform_util.h"
	# include "mbedtls/error.h"

	# include "mbedtls/md5.h"
	# include "mbedtls/ripemd160.h"
	# include "mbedtls/sha1.h"
	# include "mbedtls/sha256.h"
	# include "mbedtls/sha512.h"

	# if defined(MBEDTLS_PLATFORM_C)
	# include "mbedtls/platform.h"
	# else
	# include <stdlib.h>
	# define mbedtls_calloc calloc
	# define mbedtls_free free
	# endif

	# include <string.h>

	# if defined(MBEDTLS_FS_IO)
	# include <stdio.h>
	# endif

	# if defined(MBEDTLS_MD5_C)
	const mbedtls_md_info_t mbedtls_md5_info = {
	"MD5",
	MBEDTLS_MD_MD5,
	16,
	64,
	};
	# endif

	# if defined(MBEDTLS_RIPEMD160_C)
	const mbedtls_md_info_t mbedtls_ripemd160_info = {
	"RIPEMD160",
	MBEDTLS_MD_RIPEMD160,
	20,
	64,
	};
	# endif

	# if defined(MBEDTLS_SHA1_C)
	const mbedtls_md_info_t mbedtls_sha1_info = {
	"SHA1",
	MBEDTLS_MD_SHA1,
	20,
	64,
	};
	# endif

	# if defined(MBEDTLS_SHA224_C)
	const mbedtls_md_info_t mbedtls_sha224_info = {
	"SHA224",
	MBEDTLS_MD_SHA224,
	28,
	64,
	};
	# endif

	# if defined(MBEDTLS_SHA256_C)
	const mbedtls_md_info_t mbedtls_sha256_info = {
	"SHA256",
	MBEDTLS_MD_SHA256,
	32,
	64,
	};
	# endif

	# if defined(MBEDTLS_SHA384_C)
	const mbedtls_md_info_t mbedtls_sha384_info = {
	"SHA384",
	MBEDTLS_MD_SHA384,
	48,
	128,
	};
	# endif

	# if defined(MBEDTLS_SHA512_C)
	const mbedtls_md_info_t mbedtls_sha512_info = {
	"SHA512",
	MBEDTLS_MD_SHA512,
	64,
	128,
	};
	# endif

	/*
	* Reminder: update profiles in x509_crt.c when adding a new hash!
	*/
	static const int supported_digests[] = {

	# if defined(MBEDTLS_SHA512_C)
	MBEDTLS_MD_SHA512,
	# endif

	# if defined(MBEDTLS_SHA384_C)
	MBEDTLS_MD_SHA384,
	# endif

	# if defined(MBEDTLS_SHA256_C)
	MBEDTLS_MD_SHA256,
	# endif
	# if defined(MBEDTLS_SHA224_C)
	MBEDTLS_MD_SHA224,
	# endif

	# if defined(MBEDTLS_SHA1_C)
	MBEDTLS_MD_SHA1,
	# endif

	# if defined(MBEDTLS_RIPEMD160_C)
	MBEDTLS_MD_RIPEMD160,
	# endif

	# if defined(MBEDTLS_MD5_C)
	MBEDTLS_MD_MD5,
	# endif

	MBEDTLS_MD_NONE
	};

	const int *mbedtls_md_list(void)
	{
	return supported_digests;
	}

	const mbedtls_md_info_t mbedtls_md_info_from_string(const char md_name)
	{
	if (NULL == md_name)
	return NULL;

	/* Get the appropriate digest information */
	# if defined(MBEDTLS_MD5_C)
	if (!strcmp("MD5", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_MD5);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	if (!strcmp("RIPEMD160", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_RIPEMD160);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	if (!strcmp("SHA1", md_name) \|\| !strcmp("SHA", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	if (!strcmp("SHA224", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_SHA224);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	if (!strcmp("SHA256", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	if (!strcmp("SHA384", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	if (!strcmp("SHA512", md_name))
	return mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
	# endif
	return NULL;
	}

	const mbedtls_md_info_t *mbedtls_md_info_from_type(mbedtls_md_type_t md_type)
	{
	switch (md_type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return &mbedtls_md5_info;
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return &mbedtls_ripemd160_info;
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return &mbedtls_sha1_info;
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return &mbedtls_sha224_info;
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return &mbedtls_sha256_info;
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return &mbedtls_sha384_info;
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return &mbedtls_sha512_info;
	# endif
	default:
	return NULL;
	}
	}

	void mbedtls_md_init(mbedtls_md_context_t *ctx)
	{
	memset(ctx, 0, sizeof(mbedtls_md_context_t));
	}

	void mbedtls_md_free(mbedtls_md_context_t *ctx)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL)
	return;

	if (ctx->md_ctx != NULL) {
	switch (ctx->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	mbedtls_md5_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	mbedtls_ripemd160_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	mbedtls_sha1_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	mbedtls_sha256_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	mbedtls_sha256_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	mbedtls_sha512_free(ctx->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	mbedtls_sha512_free(ctx->md_ctx);
	break;
	# endif
	default:
	/* Shouldn't happen */
	break;
	}
	mbedtls_free(ctx->md_ctx);
	}

	if (ctx->hmac_ctx != NULL) {
	mbedtls_platform_zeroize(ctx->hmac_ctx, 2 * ctx->md_info->block_size);
	mbedtls_free(ctx->hmac_ctx);
	}

	mbedtls_platform_zeroize(ctx, sizeof(mbedtls_md_context_t));
	}

	int mbedtls_md_clone(mbedtls_md_context_t dst, const mbedtls_md_context_t src)
	{
	if (dst == NULL \|\| dst->md_info == NULL \|\| src == NULL \|\|
	src->md_info == NULL \|\| dst->md_info != src->md_info) {
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}

	switch (src->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	mbedtls_md5_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	mbedtls_ripemd160_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	mbedtls_sha1_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	mbedtls_sha256_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	mbedtls_sha256_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	mbedtls_sha512_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	mbedtls_sha512_clone(dst->md_ctx, src->md_ctx);
	break;
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}

	return 0;
	}

	# define ALLOC(type) \
	do { \
	ctx->md_ctx = mbedtls_calloc(1, sizeof(mbedtls_##type##_context)); \
	if (ctx->md_ctx == NULL) \
	return MBEDTLS_ERR_MD_ALLOC_FAILED; \
	mbedtls_##type##_init(ctx->md_ctx); \
	} while (0)

	int mbedtls_md_setup(mbedtls_md_context_t *ctx,
	const mbedtls_md_info_t *md_info,
	int hmac)
	{
	if (md_info == NULL \|\| ctx == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	ctx->md_info = md_info;
	ctx->md_ctx = NULL;
	ctx->hmac_ctx = NULL;

	switch (md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	ALLOC(md5);
	break;
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	ALLOC(ripemd160);
	break;
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	ALLOC(sha1);
	break;
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	ALLOC(sha256);
	break;
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	ALLOC(sha256);
	break;
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	ALLOC(sha512);
	break;
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	ALLOC(sha512);
	break;
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}

	if (hmac != 0) {
	ctx->hmac_ctx = mbedtls_calloc(2, md_info->block_size);
	if (ctx->hmac_ctx == NULL) {
	mbedtls_md_free(ctx);
	return MBEDTLS_ERR_MD_ALLOC_FAILED;
	}
	}

	return 0;
	}
	# undef ALLOC

	int mbedtls_md_starts(mbedtls_md_context_t *ctx)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	switch (ctx->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return mbedtls_md5_starts(ctx->md_ctx);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return mbedtls_ripemd160_starts(ctx->md_ctx);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return mbedtls_sha1_starts(ctx->md_ctx);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return mbedtls_sha256_starts(ctx->md_ctx, 1);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return mbedtls_sha256_starts(ctx->md_ctx, 0);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return mbedtls_sha512_starts(ctx->md_ctx, 1);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return mbedtls_sha512_starts(ctx->md_ctx, 0);
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}
	}

	int mbedtls_md_update(mbedtls_md_context_t *ctx,
	const unsigned char *input,
	size_t ilen)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	switch (ctx->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return mbedtls_md5_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return mbedtls_ripemd160_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return mbedtls_sha1_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return mbedtls_sha256_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return mbedtls_sha256_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return mbedtls_sha512_update(ctx->md_ctx, input, ilen);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return mbedtls_sha512_update(ctx->md_ctx, input, ilen);
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}
	}

	int mbedtls_md_finish(mbedtls_md_context_t ctx, unsigned char output)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	switch (ctx->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return mbedtls_md5_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return mbedtls_ripemd160_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return mbedtls_sha1_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return mbedtls_sha256_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return mbedtls_sha256_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return mbedtls_sha512_finish(ctx->md_ctx, output);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return mbedtls_sha512_finish(ctx->md_ctx, output);
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}
	}

	int mbedtls_md(const mbedtls_md_info_t *md_info,
	const unsigned char *input,
	size_t ilen,
	unsigned char *output)
	{
	if (md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	switch (md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return mbedtls_md5(input, ilen, output);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return mbedtls_ripemd160(input, ilen, output);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return mbedtls_sha1(input, ilen, output);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return mbedtls_sha256(input, ilen, output, 1);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return mbedtls_sha256(input, ilen, output, 0);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return mbedtls_sha512(input, ilen, output, 1);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return mbedtls_sha512(input, ilen, output, 0);
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}
	}

	# if defined(MBEDTLS_FS_IO)
	int mbedtls_md_file(const mbedtls_md_info_t *md_info,
	const char *path,
	unsigned char *output)
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	FILE *f;
	size_t n;
	mbedtls_md_context_t ctx;
	unsigned char buf[1024];

	if (md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	if ((f = fopen(path, "rb")) == NULL)
	return MBEDTLS_ERR_MD_FILE_IO_ERROR;

	mbedtls_md_init(&ctx);

	if ((ret = mbedtls_md_setup(&ctx, md_info, 0)) != 0)
	goto cleanup;

	if ((ret = mbedtls_md_starts(&ctx)) != 0)
	goto cleanup;

	while ((n = fread(buf, 1, sizeof(buf), f)) > 0)
	if ((ret = mbedtls_md_update(&ctx, buf, n)) != 0)
	goto cleanup;

	if (ferror(f) != 0)
	ret = MBEDTLS_ERR_MD_FILE_IO_ERROR;
	else
	ret = mbedtls_md_finish(&ctx, output);

	cleanup:
	mbedtls_platform_zeroize(buf, sizeof(buf));
	fclose(f);
	mbedtls_md_free(&ctx);

	return ret;
	}
	# endif /* MBEDTLS_FS_IO */

	int mbedtls_md_hmac_starts(mbedtls_md_context_t *ctx,
	const unsigned char *key,
	size_t keylen)
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	unsigned char sum[MBEDTLS_MD_MAX_SIZE];
	unsigned char ipad, opad;
	size_t i;

	if (ctx == NULL \|\| ctx->md_info == NULL \|\| ctx->hmac_ctx == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	if (keylen > (size_t)ctx->md_info->block_size) {
	if ((ret = mbedtls_md_starts(ctx)) != 0)
	goto cleanup;
	if ((ret = mbedtls_md_update(ctx, key, keylen)) != 0)
	goto cleanup;
	if ((ret = mbedtls_md_finish(ctx, sum)) != 0)
	goto cleanup;

	keylen = ctx->md_info->size;
	key = sum;
	}

	ipad = (unsigned char *)ctx->hmac_ctx;
	opad = (unsigned char *)ctx->hmac_ctx + ctx->md_info->block_size;

	memset(ipad, 0x36, ctx->md_info->block_size);
	memset(opad, 0x5C, ctx->md_info->block_size);

	for (i = 0; i < keylen; i++) {
	ipad[i] = (unsigned char)(ipad[i] ^ key[i]);
	opad[i] = (unsigned char)(opad[i] ^ key[i]);
	}

	if ((ret = mbedtls_md_starts(ctx)) != 0)
	goto cleanup;
	if ((ret = mbedtls_md_update(ctx, ipad, ctx->md_info->block_size)) != 0)
	goto cleanup;

	cleanup:
	mbedtls_platform_zeroize(sum, sizeof(sum));

	return ret;
	}

	int mbedtls_md_hmac_update(mbedtls_md_context_t *ctx,
	const unsigned char *input,
	size_t ilen)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL \|\| ctx->hmac_ctx == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	return mbedtls_md_update(ctx, input, ilen);
	}

	int mbedtls_md_hmac_finish(mbedtls_md_context_t ctx, unsigned char output)
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	unsigned char tmp[MBEDTLS_MD_MAX_SIZE];
	unsigned char *opad;

	if (ctx == NULL \|\| ctx->md_info == NULL \|\| ctx->hmac_ctx == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	opad = (unsigned char *)ctx->hmac_ctx + ctx->md_info->block_size;

	if ((ret = mbedtls_md_finish(ctx, tmp)) != 0)
	return ret;
	if ((ret = mbedtls_md_starts(ctx)) != 0)
	return ret;
	if ((ret = mbedtls_md_update(ctx, opad, ctx->md_info->block_size)) != 0)
	return ret;
	if ((ret = mbedtls_md_update(ctx, tmp, ctx->md_info->size)) != 0)
	return ret;
	return mbedtls_md_finish(ctx, output);
	}

	int mbedtls_md_hmac_reset(mbedtls_md_context_t *ctx)
	{
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	unsigned char *ipad;

	if (ctx == NULL \|\| ctx->md_info == NULL \|\| ctx->hmac_ctx == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	ipad = (unsigned char *)ctx->hmac_ctx;

	if ((ret = mbedtls_md_starts(ctx)) != 0)
	return ret;
	return mbedtls_md_update(ctx, ipad, ctx->md_info->block_size);
	}

	int mbedtls_md_hmac(const mbedtls_md_info_t *md_info,
	const unsigned char *key,
	size_t keylen,
	const unsigned char *input,
	size_t ilen,
	unsigned char *output)
	{
	mbedtls_md_context_t ctx;
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

	if (md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	mbedtls_md_init(&ctx);

	if ((ret = mbedtls_md_setup(&ctx, md_info, 1)) != 0)
	goto cleanup;

	if ((ret = mbedtls_md_hmac_starts(&ctx, key, keylen)) != 0)
	goto cleanup;
	if ((ret = mbedtls_md_hmac_update(&ctx, input, ilen)) != 0)
	goto cleanup;
	if ((ret = mbedtls_md_hmac_finish(&ctx, output)) != 0)
	goto cleanup;

	cleanup:
	mbedtls_md_free(&ctx);

	return ret;
	}

	int mbedtls_md_process(mbedtls_md_context_t ctx, const unsigned char data)
	{
	if (ctx == NULL \|\| ctx->md_info == NULL)
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;

	switch (ctx->md_info->type) {
	# if defined(MBEDTLS_MD5_C)
	case MBEDTLS_MD_MD5:
	return mbedtls_internal_md5_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_RIPEMD160_C)
	case MBEDTLS_MD_RIPEMD160:
	return mbedtls_internal_ripemd160_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_SHA1_C)
	case MBEDTLS_MD_SHA1:
	return mbedtls_internal_sha1_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_SHA224_C)
	case MBEDTLS_MD_SHA224:
	return mbedtls_internal_sha256_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_SHA256_C)
	case MBEDTLS_MD_SHA256:
	return mbedtls_internal_sha256_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_SHA384_C)
	case MBEDTLS_MD_SHA384:
	return mbedtls_internal_sha512_process(ctx->md_ctx, data);
	# endif
	# if defined(MBEDTLS_SHA512_C)
	case MBEDTLS_MD_SHA512:
	return mbedtls_internal_sha512_process(ctx->md_ctx, data);
	# endif
	default:
	return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
	}
	}

	unsigned char mbedtls_md_get_size(const mbedtls_md_info_t *md_info)
	{
	if (md_info == NULL)
	return 0;

	return md_info->size;
	}

	mbedtls_md_type_t mbedtls_md_get_type(const mbedtls_md_info_t *md_info)
	{
	if (md_info == NULL)
	return MBEDTLS_MD_NONE;

	return md_info->type;
	}

	const char mbedtls_md_get_name(const mbedtls_md_info_t md_info)
	{
	if (md_info == NULL)
	return NULL;

	return md_info->name;
	}

	#endif /* MBEDTLS_MD_C */