mdc2
Section: OpenSSL (3)
Updated: 2017-05-25
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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.
Index
- NAME
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- SYNOPSIS
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- DESCRIPTION
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- RETURN VALUES
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- CONFORMING TO
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- SEE ALSO
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- HISTORY
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