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mdc2(3SSL) OpenSSL mdc2(3SSL)


MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function


 #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);


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.


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


sha(3), EVP_DigestInit(3)


MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since SSLeay 0.8.
2017-05-25 1.0.2l