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101 lines
2.8 KiB
101 lines
2.8 KiB
=pod |
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=head1 NAME |
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MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, |
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MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions |
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=head1 SYNOPSIS |
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#include <openssl/md2.h> |
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unsigned char *MD2(const unsigned char *d, unsigned long n, |
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unsigned char *md); |
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int MD2_Init(MD2_CTX *c); |
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int MD2_Update(MD2_CTX *c, const unsigned char *data, |
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unsigned long len); |
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int MD2_Final(unsigned char *md, MD2_CTX *c); |
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#include <openssl/md4.h> |
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unsigned char *MD4(const unsigned char *d, unsigned long n, |
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unsigned char *md); |
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int MD4_Init(MD4_CTX *c); |
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int MD4_Update(MD4_CTX *c, const void *data, |
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unsigned long len); |
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int MD4_Final(unsigned char *md, MD4_CTX *c); |
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#include <openssl/md5.h> |
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unsigned char *MD5(const unsigned char *d, unsigned long n, |
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unsigned char *md); |
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int MD5_Init(MD5_CTX *c); |
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int MD5_Update(MD5_CTX *c, const void *data, |
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unsigned long len); |
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int MD5_Final(unsigned char *md, MD5_CTX *c); |
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=head1 DESCRIPTION |
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MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output. |
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MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest |
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of the B<n> bytes at B<d> and place it in B<md> (which must have space |
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for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 |
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bytes of output). If B<md> is NULL, the digest is placed in a static |
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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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MD2_Init() initializes a B<MD2_CTX> structure. |
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MD2_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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MD2_Final() places the message digest in B<md>, which must have space |
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for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MD2_CTX>. |
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MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and |
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MD5_Final() are analogous using an B<MD4_CTX> and B<MD5_CTX> structure. |
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Applications should use the higher level functions |
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L<EVP_DigestInit(3)|EVP_DigestInit(3)> |
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etc. instead of calling the hash functions directly. |
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=head1 NOTE |
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MD2, MD4, and MD5 are recommended only for compatibility with existing |
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applications. In new applications, SHA-1 or RIPEMD-160 should be |
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preferred. |
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=head1 RETURN VALUES |
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MD2(), MD4(), and MD5() return pointers to the hash value. |
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MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), |
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MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for |
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success, 0 otherwise. |
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=head1 CONFORMING TO |
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RFC 1319, RFC 1320, RFC 1321 |
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=head1 SEE ALSO |
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L<sha(3)|sha(3)>, L<ripemd(3)|ripemd(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)> |
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=head1 HISTORY |
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MD2(), MD2_Init(), MD2_Update() MD2_Final(), MD5(), MD5_Init(), |
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MD5_Update() and MD5_Final() are available in all versions of SSLeay |
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and OpenSSL. |
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MD4(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and |
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above. |
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=cut
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