Manual Pages for UNIX Operating System command usage for man MDC2_Update

OpenSSL                                            mdc2(3openssl)



NNNNAAAAMMMMEEEE
     MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash
     function

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      #include 

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

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


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     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 nnnn bytes at dddd
     and places it in mmmmdddd (which must have space for
     MDC2_DIGEST_LENGTH == 16 bytes of output). If mmmmdddd 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 MMMMDDDDCCCC2222_CCCCTTTTXXXX structure.

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

     MDC2_Final() places the message digest in mmmmdddd, which must
     have space for MDC2_DIGEST_LENGTH == 16 bytes of output, and
     erases the MMMMDDDDCCCC2222_CCCCTTTTXXXX.

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

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     MDC2() returns a pointer to the hash value.

     MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for
     success, 0 otherwise.

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     ISO/IEC 10118-2, with DES





27/Oct/2006            Last change: 0.9.8o                      1






OpenSSL                                            mdc2(3openssl)



SSSSEEEEEEEE AAAALLLLSSSSOOOO
     sha(3), EVP_DigestInit(3)

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

















































27/Oct/2006            Last change: 0.9.8o                      2