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.
MDC2() 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 may be used if the message is not
completely stored in memory:
MDC2_Init() initializes a MDC2_CTX structure.
MDC2_Update() can be called repeatedly with chunks of the
message to be hashed (len bytes at data).
MDC2_Final() 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 EVP_DigestInit(3) etc.
instead of calling the hash functions directly.
RETURN VALUES
MDC2() returns a pointer to the hash value.
MDC2_Init(), MDC2_Update() and MDC2_Final() do not return
values.
CONFORMING TO
ISO/IEC 10118-2, with DES
SEE ALSO
sha(3), EVP_DigestInit(3)
HISTORY
MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available
since SSLeay 0.8.
