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mdc2(3) 			    OpenSSL			       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); 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.

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. 1.0.1h 2014-06-05 mdc2(3)