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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 output.

  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_DigestInit(), 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)

Index for Section 3

Alphabetical listing for M

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