text: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.] */
  
  #include <openssl/digest.h>
  
  #include <assert.h>
  #include <string.h>
  
  #include <openssl/md4.h>
  #include <openssl/md5.h>
  #include <openssl/obj.h>
  #include <openssl/sha.h>
  
  #include "internal.h"
  
  #if defined(NDEBUG)
  #define CHECK(x) (void) (x)
  #else
  #define CHECK(x) assert(x)
  #endif
  
  
  static void md4_init(EVP_MD_CTX *ctx) {
    CHECK(MD4_Init(ctx->md_data));
  }
  
  static void md4_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(MD4_Update(ctx->md_data, data, count));
  }
  
  static void md4_final(EVP_MD_CTX *ctx, uint8_t *out) {
    CHECK(MD4_Final(out, ctx->md_data));
  }
  
  static const EVP_MD md4_md = {
      NID_md4,    MD4_DIGEST_LENGTH, 0 /* flags */,       md4_init,
      md4_update, md4_final,         64 /* block size */, sizeof(MD4_CTX),
  };
  
  const EVP_MD *EVP_md4(void) { return &md4_md; }
  
  
  static void md5_init(EVP_MD_CTX *ctx) {
    CHECK(MD5_Init(ctx->md_data));
  }
  
  static void md5_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(MD5_Update(ctx->md_data, data, count));
  }
  
  static void md5_final(EVP_MD_CTX *ctx, uint8_t *out) {
    CHECK(MD5_Final(out, ctx->md_data));
  }
  
  static const EVP_MD md5_md = {
      NID_md5,    MD5_DIGEST_LENGTH, 0 /* flags */,       md5_init,
      md5_update, md5_final,         64 /* block size */, sizeof(MD5_CTX),
  };
  
  const EVP_MD *EVP_md5(void) { return &md5_md; }
  
  
  static void sha1_init(EVP_MD_CTX *ctx) {
    CHECK(SHA1_Init(ctx->md_data));
  }
  
  static void sha1_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(SHA1_Update(ctx->md_data, data, count));
  }
  
  static void sha1_final(EVP_MD_CTX *ctx, uint8_t *md) {
    CHECK(SHA1_Final(md, ctx->md_data));
  }
  
  static const EVP_MD sha1_md = {
      NID_sha1,    SHA_DIGEST_LENGTH, 0 /* flags */,       sha1_init,
      sha1_update, sha1_final,        64 /* block size */, sizeof(SHA_CTX),
  };
  
  const EVP_MD *EVP_sha1(void) { return &sha1_md; }
  
  
  static void sha224_init(EVP_MD_CTX *ctx) {
    CHECK(SHA224_Init(ctx->md_data));
  }
  
  static void sha224_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(SHA224_Update(ctx->md_data, data, count));
  }
  
  static void sha224_final(EVP_MD_CTX *ctx, uint8_t *md) {
    CHECK(SHA224_Final(md, ctx->md_data));
  }
  
  static const EVP_MD sha224_md = {
      NID_sha224,          SHA224_DIGEST_LENGTH, 0 /* flags */,
      sha224_init,         sha224_update,        sha224_final,
      64 /* block size */, sizeof(SHA256_CTX),
  };
  
  const EVP_MD *EVP_sha224(void) { return &sha224_md; }
  
  
  static void sha256_init(EVP_MD_CTX *ctx) {
    CHECK(SHA256_Init(ctx->md_data));
  }
  
  static void sha256_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(SHA256_Update(ctx->md_data, data, count));
  }
  
  static void sha256_final(EVP_MD_CTX *ctx, uint8_t *md) {
    CHECK(SHA256_Final(md, ctx->md_data));
  }
  
  static const EVP_MD sha256_md = {
      NID_sha256,          SHA256_DIGEST_LENGTH, 0 /* flags */,
      sha256_init,         sha256_update,        sha256_final,
      64 /* block size */, sizeof(SHA256_CTX),
  };
  
  const EVP_MD *EVP_sha256(void) { return &sha256_md; }
  
  
  static void sha384_init(EVP_MD_CTX *ctx) {
    CHECK(SHA384_Init(ctx->md_data));
  }
  
  static void sha384_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(SHA384_Update(ctx->md_data, data, count));
  }
  
  static void sha384_final(EVP_MD_CTX *ctx, uint8_t *md) {
    CHECK(SHA384_Final(md, ctx->md_data));
  }
  
  static const EVP_MD sha384_md = {
      NID_sha384,           SHA384_DIGEST_LENGTH, 0 /* flags */,
      sha384_init,          sha384_update,        sha384_final,
      128 /* block size */, sizeof(SHA512_CTX),
  };
  
  const EVP_MD *EVP_sha384(void) { return &sha384_md; }
  
  
  static void sha512_init(EVP_MD_CTX *ctx) {
    CHECK(SHA512_Init(ctx->md_data));
  }
  
  static void sha512_update(EVP_MD_CTX *ctx, const void *data, size_t count) {
    CHECK(SHA512_Update(ctx->md_data, data, count));
  }
  
  static void sha512_final(EVP_MD_CTX *ctx, uint8_t *md) {
    CHECK(SHA512_Final(md, ctx->md_data));
  }
  
  static const EVP_MD sha512_md = {
      NID_sha512,           SHA512_DIGEST_LENGTH, 0 /* flags */,
      sha512_init,          sha512_update,        sha512_final,
      128 /* block size */, sizeof(SHA512_CTX),
  };
  
  const EVP_MD *EVP_sha512(void) { return &sha512_md; }
  
  
  typedef struct {
    MD5_CTX md5;
    SHA_CTX sha1;
  } MD5_SHA1_CTX;
  
  static void md5_sha1_init(EVP_MD_CTX *md_ctx) {
    MD5_SHA1_CTX *ctx = md_ctx->md_data;
    CHECK(MD5_Init(&ctx->md5) && SHA1_Init(&ctx->sha1));
  }
  
  static void md5_sha1_update(EVP_MD_CTX *md_ctx, const void *data,
                              size_t count) {
    MD5_SHA1_CTX *ctx = md_ctx->md_data;
    CHECK(MD5_Update(&ctx->md5, data, count) &&
          SHA1_Update(&ctx->sha1, data, count));
  }
  
  static void md5_sha1_final(EVP_MD_CTX *md_ctx, uint8_t *out) {
    MD5_SHA1_CTX *ctx = md_ctx->md_data;
    CHECK(MD5_Final(out, &ctx->md5) &&
          SHA1_Final(out + MD5_DIGEST_LENGTH, &ctx->sha1));
  }
  
  static const EVP_MD md5_sha1_md = {
      NID_md5_sha1,
      MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
      0 /* flags */,
      md5_sha1_init,
      md5_sha1_update,
      md5_sha1_final,
      64 /* block size */,
      sizeof(MD5_SHA1_CTX),
  };
  
  const EVP_MD *EVP_md5_sha1(void) { return &md5_sha1_md; }
  
  
  struct nid_to_digest {
    int nid;
    const EVP_MD* (*md_func)(void);
    const char *short_name;
    const char *long_name;
  };
  
  static const struct nid_to_digest nid_to_digest_mapping[] = {
    { NID_md5, EVP_md5, SN_md5, LN_md5 },
    { NID_sha1, EVP_sha1, SN_sha1, LN_sha1 },
    { NID_sha224, EVP_sha224, SN_sha224, LN_sha224 },
    { NID_sha256, EVP_sha256, SN_sha256, LN_sha256 },
    { NID_sha384, EVP_sha384, SN_sha384, LN_sha384 },
    { NID_sha512, EVP_sha512, SN_sha512, LN_sha512 },
    { NID_md5_sha1, EVP_md5_sha1, SN_md5_sha1, LN_md5_sha1 },
    { NID_dsaWithSHA, EVP_sha1, SN_dsaWithSHA, LN_dsaWithSHA },
    { NID_dsaWithSHA1, EVP_sha1, SN_dsaWithSHA1, LN_dsaWithSHA1 },
    { NID_ecdsa_with_SHA1, EVP_sha1, SN_ecdsa_with_SHA1, NULL },
    { NID_md5WithRSAEncryption, EVP_md5, SN_md5WithRSAEncryption,
      LN_md5WithRSAEncryption },
    { NID_sha1WithRSAEncryption, EVP_sha1, SN_sha1WithRSAEncryption,
      LN_sha1WithRSAEncryption },
    { NID_sha224WithRSAEncryption, EVP_sha224, SN_sha224WithRSAEncryption,
      LN_sha224WithRSAEncryption },
    { NID_sha256WithRSAEncryption, EVP_sha256, SN_sha256WithRSAEncryption,
      LN_sha256WithRSAEncryption },
    { NID_sha384WithRSAEncryption, EVP_sha384, SN_sha384WithRSAEncryption,
      LN_sha384WithRSAEncryption },
    { NID_sha512WithRSAEncryption, EVP_sha512, SN_sha512WithRSAEncryption,
      LN_sha512WithRSAEncryption },
  };
  
  const EVP_MD* EVP_get_digestbynid(int nid) {
    unsigned i;
  
    for (i = 0; i < sizeof(nid_to_digest_mapping) / sizeof(struct nid_to_digest);
         i++) {
      if (nid_to_digest_mapping[i].nid == nid) {
        return nid_to_digest_mapping[i].md_func();
      }
    }
  
    return NULL;
  }
  
  const EVP_MD* EVP_get_digestbyobj(const ASN1_OBJECT *obj) {
    return EVP_get_digestbynid(OBJ_obj2nid(obj));
  }
  
  const EVP_MD *EVP_get_digestbyname(const char *name) {
    unsigned i;
  
    for (i = 0; i < sizeof(nid_to_digest_mapping) / sizeof(struct nid_to_digest);
         i++) {
      const char *short_name = nid_to_digest_mapping[i].short_name;
      const char *long_name = nid_to_digest_mapping[i].long_name;
      if ((short_name && strcmp(short_name, name) == 0) ||
          (long_name && strcmp(long_name, name) == 0)) {
        return nid_to_digest_mapping[i].md_func();
      }
    }
  
    return NULL;
  }
  