Index for Section 3

Alphabetical listing for M

Bottom of page

MDC2(3)
NAME
  MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function

SYNOPSIS
  #include <openssl/mdc2.h>

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

  void MDC2_Init(
	  MDC2_CTX *c );

  void MDC2_Update(
	  MDC2_CTX *c, const unsigned char *data,		     unsigned
  long len );

  void MDC2_Final(
	  unsigned char *md, MDC2_CTX *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.

  The MDC2() function computes the MDC2 message digest of the n bytes at d
  and places it in md (which must have space for MDC2_DIGEST_LENGTH == 16
  bytes of output). If md is NULL, the digest is placed in a static array.

  The following functions can be used if the message is not completely stored
  in memory:

  The MDC2_Init() function initializes a MDC2_CTX structure.

  The MDC2_Update() function can be called repeatedly with chunks of the
  message to be hashed (len bytes at data).

  The MDC2_Final() function places the message digest in md, which must have
  space for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the
  MDC2_CTX.

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

  MDC2 conforms to ISO/IEC 10118-2, with DES.

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

  The MDC2_Init(), MDC2_Update(), and MDC2_Final() functions do not return
  values.

HISTORY
  The MDC2(), MDC2_Init(), MDC2_Update(), and MDC2_Final() functions are
  available since SSLeay 0.8.

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

Index for Section 3

Alphabetical listing for M

Top of page