bbda8ce9da
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4628)
68 lines
1.9 KiB
Text
68 lines
1.9 KiB
Text
=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)> 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 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_DigestInit(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|