MDC2(3)

     mdc2(3)                0.9.6h (2000-02-25)                mdc2(3)

     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)

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     mdc2(3)                0.9.6h (2000-02-25)                mdc2(3)

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

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