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NAME

     MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash
     function



SYNOPSIS
      #include <openssl/mdc2.h>

      unsigned char *MDC2(const unsigned char *d, unsigned long n,
                       unsigned char *md);

      void MDC2_Init(MDC2_CTX *c);
      void MDC2_Update(MDC2_CTX *c, const unsigned char *data,
                       unsigned long len);
      void MDC2_Final(unsigned char *md, MDC2_CTX *c);




DESCRIPTION
     MDC2 is a method to construct hash functions with 128 bit
     output from block ciphers.  These functions are an
     implementation of MDC2 with DES.

     MDC2() computes the MDC2 message digest of the n bytes at d
     and places it in md (which must have space for
     MDC2_DIGEST_LENGTH == 16 bytes of output). If md is NULL,
     the digest is placed in a static array.

     The following functions may be used if the message is not
     completely stored in memory:

     MDC2_Init() initializes a MDC2_CTX structure.

     MDC2_Update() can be called repeatedly with chunks of the
     message to be hashed (len bytes at data).

     MDC2_Final() places the message digest in md, which must
     have space for MDC2_DIGEST_LENGTH == 16 bytes of output, and
     erases the MDC2_CTX.

     Applications should use the higher level functions
     EVP_DigestInit(3) etc. instead of calling the hash functions
     directly.



RETURN VALUES
     MDC2() returns a pointer to the hash value.

     MDC2_Init(), MDC2_Update() and MDC2_Final() do not return
     values.



CONFORMING TO
     ISO/IEC 10118-2, with DES




SEE ALSO
     sha(3), EVP_DigestInit(3)



HISTORY
     MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are
     available since SSLeay 0.8.









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Created 1996-2024 by Maxim Chirkov

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