md5(3) OpenSSL md5(3)

NAME
       MD2, MD4, MD5, MD2Init, MD2Update, MD2Final, MD4Init, MD4Update,
       MD4Final, MD5Init, MD5Update, MD5Final - MD2, MD4, and MD5 hash
       functions

SYNOPSIS
        #include 

        unsigned char *MD2(const unsigned char *d, unsigned long n,
                         unsigned char *md);

        void MD2Init(MD2CTX *c);
        void MD2Update(MD2CTX *c, const unsigned char *data,
                         unsigned long len);
        void MD2Final(unsigned char *md, MD2CTX *c);


        #include 

        unsigned char *MD4(const unsigned char *d, unsigned long n,
                         unsigned char *md);

        void MD4Init(MD4CTX *c);
        void MD4Update(MD4CTX *c, const void *data,
                         unsigned long len);
        void MD4Final(unsigned char *md, MD4CTX *c);


        #include 

        unsigned char *MD5(const unsigned char *d, unsigned long n,
                         unsigned char *md);

        void MD5Init(MD5CTX *c);
        void MD5Update(MD5CTX *c, const void *data,
                         unsigned long len);
        void MD5Final(unsigned char *md, MD5CTX *c);

DESCRIPTION
       MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit
       output.

       MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest of
       the nn bytes at dd and place it in mmdd (which must have space for
       MD2DIGESTLENGTH == MD4DIGESTLENGTH == MD5DIGESTLENGTH == 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:

       MD2Init() initializes a MMDD22CCTTXX structure.

       MD2Update() can be called repeatedly with chunks of the message to be
       hashed (lleenn bytes at ddaattaa).

       MD2Final() places the message digest in mmdd, which must have space for
       MD2DIGESTLENGTH == 16 bytes of output, and erases the MMDD22CCTTXX.

       MD4Init(), MD4Update(), MD4Final(), MD5Init(), MD5Update(), and
       MD5Final() are analogous using an MMDD44CCTTXX and MMDD55CCTTXX structure.

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

NNOOTTEE
       MD2, MD4, and MD5 are recommended only for compatibility with existing
       applications. In new applications, SHA-1 or RIPEMD-160 should be
       preferred.

RETURN VALUES
       MD2(), MD4(), and MD5() return pointers to the hash value.

       MD2Init(), MD2Update(), MD2Final(), MD4Init(), MD4Update(),
       MD4Final(), MD5Init(), MD5Update(), and MD5Final() do not return
       values.

CCOONNFFOORRMMIINNGG TTOO
       RFC 1319, RFC 1320, RFC 1321

SEE ALSO
       sha(3), ripemd(3), EVPDigestInit(3)

HISTORY       MD2(), MD2Init(), MD2Update() MD2Final(), MD5(), MD5Init(),
       MD5Update() and MD5Final() are available in all versions of SSLeay
       and OpenSSL.

       MD4(), MD4Init(), and MD4Update() are available in OpenSSL 0.9.6 and
       above.



0.9.7l                            2000-08-14                            md5(3)