mdc2(3)

mdc2(3) | OpenSSL | mdc2(3)

# NAME

MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function

# LIBRARY

libcrypto, -lcrypto

# 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

openssl_sha(3), EVP_DigestInit(3)

# HISTORY

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

2009-07-19 | 1.0.2k