1=pod 2 3=head1 NAME 4 5MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function 6 7=head1 SYNOPSIS 8 9 #include <openssl/mdc2.h> 10 11 unsigned char *MDC2(const unsigned char *d, unsigned long n, 12 unsigned char *md); 13 14 int MDC2_Init(MDC2_CTX *c); 15 int MDC2_Update(MDC2_CTX *c, const unsigned char *data, 16 unsigned long len); 17 int MDC2_Final(unsigned char *md, MDC2_CTX *c); 18 19=head1 DESCRIPTION 20 21MDC2 is a method to construct hash functions with 128 bit output from 22block ciphers. These functions are an implementation of MDC2 with 23DES. 24 25MDC2() computes the MDC2 message digest of the B<n> 26bytes at B<d> and places it in B<md> (which must have space for 27MDC2_DIGEST_LENGTH == 16 bytes of output). If B<md> is NULL, the digest 28is placed in a static array. 29 30The following functions may be used if the message is not completely 31stored in memory: 32 33MDC2_Init() initializes a B<MDC2_CTX> structure. 34 35MDC2_Update() can be called repeatedly with chunks of the message to 36be hashed (B<len> bytes at B<data>). 37 38MDC2_Final() places the message digest in B<md>, which must have space 39for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MDC2_CTX>. 40 41Applications should use the higher level functions 42L<EVP_DigestInit(3)|EVP_DigestInit(3)> etc. instead of calling the 43hash functions directly. 44 45=head1 RETURN VALUES 46 47MDC2() returns a pointer to the hash value. 48 49MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise. 50 51=head1 CONFORMING TO 52 53ISO/IEC 10118-2, with DES 54 55=head1 SEE ALSO 56 57L<sha(3)|sha(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)> 58 59=head1 HISTORY 60 61MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since 62SSLeay 0.8. 63 64=cut 65