1mdc2(3)                             OpenSSL                            mdc2(3)
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NAME

6       MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function
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SYNOPSIS

9        #include <openssl/mdc2.h>
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11        unsigned char *MDC2(const unsigned char *d, unsigned long n,
12                         unsigned char *md);
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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);
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DESCRIPTION

20       MDC2 is a method to construct hash functions with 128 bit output from
21       block ciphers.  These functions are an implementation of MDC2 with DES.
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23       MDC2() computes the MDC2 message digest of the n bytes at d and places
24       it in md (which must have space for MDC2_DIGEST_LENGTH == 16 bytes of
25       output). If md is NULL, the digest is placed in a static array.
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27       The following functions may be used if the message is not completely
28       stored in memory:
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30       MDC2_Init() initializes a MDC2_CTX structure.
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32       MDC2_Update() can be called repeatedly with chunks of the message to be
33       hashed (len bytes at data).
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35       MDC2_Final() places the message digest in md, which must have space for
36       MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the MDC2_CTX.
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38       Applications should use the higher level functions EVP_DigestInit(3)
39       etc. instead of calling the hash functions directly.
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RETURN VALUES

42       MDC2() returns a pointer to the hash value.
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44       MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0
45       otherwise.
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CONFORMING TO

48       ISO/IEC 10118-2, with DES
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SEE ALSO

51       sha(3), EVP_DigestInit(3)
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HISTORY

54       MDC2(), MDC2_Init(), MDC2_Update() and MDC2_Final() are available since
55       SSLeay 0.8.
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591.0.2o                            2020-08-01                           mdc2(3)