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64 lines
1.7 KiB
64 lines
1.7 KiB
=pod |
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=head1 NAME |
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MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function |
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=head1 SYNOPSIS |
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#include <openssl/mdc2.h> |
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unsigned char *MDC2(const unsigned char *d, unsigned long n, |
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unsigned char *md); |
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int MDC2_Init(MDC2_CTX *c); |
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int MDC2_Update(MDC2_CTX *c, const unsigned char *data, |
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unsigned long len); |
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int MDC2_Final(unsigned char *md, MDC2_CTX *c); |
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=head1 DESCRIPTION |
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MDC2 is a method to construct hash functions with 128 bit output from |
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block ciphers. These functions are an implementation of MDC2 with |
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DES. |
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MDC2() computes the MDC2 message digest of the B<n> |
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bytes at B<d> and places it in B<md> (which must have space for |
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MDC2_DIGEST_LENGTH == 16 bytes of output). If B<md> is NULL, the digest |
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is placed in a static array. |
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The following functions may be used if the message is not completely |
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stored in memory: |
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MDC2_Init() initializes a B<MDC2_CTX> structure. |
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MDC2_Update() can be called repeatedly with chunks of the message to |
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be hashed (B<len> bytes at B<data>). |
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MDC2_Final() places the message digest in B<md>, which must have space |
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for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MDC2_CTX>. |
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Applications should use the higher level functions |
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L<EVP_DigestInit(3)|EVP_DigestInit(3)> etc. instead of calling the |
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hash functions directly. |
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=head1 RETURN VALUES |
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MDC2() returns a pointer to the hash value. |
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MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise. |
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=head1 CONFORMING TO |
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ISO/IEC 10118-2, with DES |
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=head1 SEE ALSO |
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L<sha(3)|sha(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)> |
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=head1 HISTORY |
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MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since |
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SSLeay 0.8. |
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=cut
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