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HP Open Source Security for OpenVMS Volume 2:... |
CRYPTO Application Programming Interface (API)... |
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| Description Conforming To History | Return Values See Also |
Synopsis #include <openssl/mdc2.h>
unsigned
char *MDC2(const unsigned char *d, unsigned long n, unsigned char
*md);
void MDC2_Init(MDC2_CTX *c);
void MDC2_Update(MDC2_CTX
*c, const unsigned char *data, unsigned long len);
void
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() do not return values.
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.
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