mdc2(3) OpenSSL mdc2(3)

NAME
       MDC2, MDC2Init, MDC2Update, MDC2Final - MDC2 hash function

SYNOPSIS
        #include 

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

        void MDC2Init(MDC2CTX *c);
        void MDC2Update(MDC2CTX *c, const unsigned char *data,
                         unsigned long len);
        void MDC2Final(unsigned char *md, MDC2CTX *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 nn bytes at dd and places
       it in mmdd (which must have space for MDC2DIGESTLENGTH == 16 bytes of
       output). If mmdd 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:

       MDC2Init() initializes a MMDDCC22CCTTXX structure.

       MDC2Update() can be called repeatedly with chunks of the message to be
       hashed (lleenn bytes at ddaattaa).

       MDC2Final() places the message digest in mmdd, which must have space for
       MDC2DIGESTLENGTH == 16 bytes of output, and erases the MMDDCC22CCTTXX.

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

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

       MDC2Init(), MDC2Update() and MDC2Final() do not return values.

CCOONNFFOORRMMIINNGG TTOO
       ISO/IEC 10118-2, with DES

SEE ALSO
       sha(3), EVPDigestInit(3)

HISTORY       MDC2(), MDC2Init(), MDC2Update() and MDC2Final() are available since
       SSLeay 0.8.



0.9.7l                            2000-02-25                           mdc2(3)