65 lines
1.7 KiB
Plaintext
65 lines
1.7 KiB
Plaintext
|
=pod
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
|
||
|
|
|
||
|
|
=head1 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);
|
||
|
|
|
||
|
|
=head1 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 B<n>
|
||
|
|
bytes at B<d> and places it in B<md> (which must have space for
|
||
|
|
MDC2_DIGEST_LENGTH == 16 bytes of output). If B<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 B<MDC2_CTX> structure.
|
||
|
|
|
||
|
|
MDC2_Update() can be called repeatedly with chunks of the message to
|
||
|
|
be hashed (B<len> bytes at B<data>).
|
||
|
|
|
||
|
|
MDC2_Final() places the message digest in B<md>, which must have space
|
||
|
|
for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MDC2_CTX>.
|
||
|
|
|
||
|
|
Applications should use the higher level functions
|
||
|
|
L<EVP_DigestInit(3)|EVP_DigestInit(3)> etc. instead of calling the
|
||
|
|
hash functions directly.
|
||
|
|
|
||
|
|
=head1 RETURN VALUES
|
||
|
|
|
||
|
|
MDC2() returns a pointer to the hash value.
|
||
|
|
|
||
|
|
MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise.
|
||
|
|
|
||
|
|
=head1 CONFORMING TO
|
||
|
|
|
||
|
|
ISO/IEC 10118-2, with DES
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
L<sha(3)|sha(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)>
|
||
|
|
|
||
|
|
=head1 HISTORY
|
||
|
|
|
||
|
|
MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since
|
||
|
|
SSLeay 0.8.
|
||
|
|
|
||
|
|
=cut
|