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);
int MDC2_Init(MDC2_CTX *c);
int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
unsigned long len);
int 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() return 1 for
success, 0 otherwise.
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.