MD5(3)                     Library Functions Manual                     MD5(3)

NAME
     MD4, MD5, MD4_Init, MD4_Update, MD4_Final, MD5_Init, MD5_Update,
     MD5_Final - MD4 and MD5 hash functions

SYNOPSIS
     #include <openssl/md4.h>

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

     int
     MD4_Init(MD4_CTX *c);

     int
     MD4_Update(MD4_CTX *c, const void *data, unsigned long len);

     int
     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);

     int
     MD5_Init(MD5_CTX *c);

     int
     MD5_Update(MD5_CTX *c, const void *data, unsigned long len);

     int
     MD5_Final(unsigned char *md, MD5_CTX *c);

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

     MD4() and MD5() compute the MD4 and MD5 message digest of the n bytes at
     d and place it in md, which must have space for 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:

     MD5_Init() initializes a MD5_CTX structure.

     MD5_Update() can be called repeatedly with chunks of the message to be
     hashed (len bytes at data).

     MD5_Final() places the message digest in md, which must have space for
     MD5_DIGEST_LENGTH == 16 bytes of output, and erases the MD5_CTX.

     MD4_Init(), MD4_Update(), and MD4_Final() are analogous using an MD4_CTX
     structure.

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

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

     MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and
     MD5_Final() return 1 for success or 0 otherwise.

SEE ALSO
     EVP_DigestInit(3)

STANDARDS
     RFC 1320, RFC 1321

HISTORY
     MD5(), MD5_Init(), MD5_Update(), and MD5_Final() appeared in SSLeay 0.4
     or earlier and have been available since OpenBSD 2.4.

     MD4(), MD4_Init(), MD4_Update(), and MD4_Final() first appeared in
     OpenSSL 0.9.6 and have been available since OpenBSD 2.9.

Linux 6.8.2-arch2-1             March 27, 2018             Linux 6.8.2-arch2-1