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md5(3)									md5(3)

NAME
       md5,   MD2,   MD4,  MD5,	 MD2_Init,  MD2_Update,	 MD2_Final,  MD4_Init,
       MD4_Update, MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4,  and
       MD5 hash functions

SYNOPSIS
       #include <openssl/md2.h>

       unsigned char *MD2(
	       const	 unsigned     char     *d,     unsigned	    long    n,
       unsigned char *md ); void MD2_Init(
	       MD2_CTX *c ); void MD2_Update(
	       MD2_CTX	    *c,	     const	unsigned      char	*data,
       unsigned long len ); void MD2_Final(
	       unsigned char *md, MD2_CTX *c ); #include <openssl/md4.h>

       unsigned char *MD4(
	       const  unsigned	char *d, unsigned long n, unsigned char *md );
       void MD4_Init(
	       MD4_CTX *c ); void MD4_Update(
	       MD4_CTX *c,  const  void	 *data,	 unsigned  long	 len  );  void
       MD4_Final(
	       unsigned char *md, MD4_CTX *c ); #include <openssl/md5.h>

       unsigned char *MD5(
	       const  unsigned	char *d, unsigned long n, unsigned char *md );
       void MD5_Init(
	       MD5_CTX *c ); void MD5_Update(
	       MD5_CTX *c,  const  void	 *data,	 unsigned  long	 len  );  void
       MD5_Final(
	       unsigned char *md, MD5_CTX *c );

DESCRIPTION
       MD2,  MD4, and MD5 are cryptographic hash functions with a 128 bit out‐
       put.

       The MD2(), MD4(), and MD5() functions compute the  MD2,	MD4,  and  MD5
       message	digest of the n bytes at d and place it in md (which must have
       space for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH	 ==  MD5_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:

       The MD2_Init() function initializes a MD2_CTX structure.

       The  MD2_Update()  function can be called repeatedly with chunks of the
       message to be hashed (len bytes at data).

       The MD2_Final() function places the message digest in  md,  which  must
       have  space for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the
       MD2_CTX.

       The MD4_Init(), MD4_Update(),  MD4_Final(),  MD5_Init(),	 MD5_Update(),
       and  MD5_Final()	 functions  are analogous using an MD4_CTX and MD5_CTX
       structure.

       Applications should use the higher level functions, such as  EVP_Diges‐
       tInit(), instead of calling the hash functions directly.

       MD2, MD4, and MD5 conform to RFC 1319, RFC 1320, and RFC 1321.

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

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

       The  MD2_Init(),	 MD2_Update(),	MD2_Final(), MD4_Init(), MD4_Update(),
       MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() functions do not
       return values.

HISTORY
       The  MD2(),  MD2_Init(), MD2_Update(), MD2_Final()), MD5(), MD5_Init(),
       MD5_Update(), and MD5_Final() functions are available in	 all  versions
       of SSLeay and OpenSSL.

       The  MD4(),  MD4_Init(),	 and  MD4_Update()  functions are available in
       OpenSSL 0.9.6 and above.

SEE ALSO
       Functions: sha(3), ripemd(3), EVP_DigestInit(3)

									md5(3)
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