™.. mdc2 - Online Linux Manual PageSection : 3
Updated : 2013-02-11
Source : 1.0.1e
Note : OpenSSL

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NAMEMDC2, MDC2_Init, MDC2_Update, MDC2_Final − MDC2 hash function

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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);

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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.

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RETURN VALUES​MDC2() returns a pointer to the hash value. ​MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise.

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CONFORMING TO​ISO/IEC 10118−2, with DES

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SEE ALSO​sha (3), EVP_DigestInit (3)

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HISTORY​MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since SSLeay 0.8. 0

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