2000-02-03 18:22:01 +00:00
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=pod
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=head1 NAME
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MD2, MD5, MD2_Init, MD2_Update, MD2_Final, MD5_Init, MD5_Update,
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MD5_Final - MD2 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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void MD2_Init(MD2_CTX *c);
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void MD2_Update(MD2_CTX *c, const unsigned char *data,
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unsigned long len);
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void MD2_Final(unsigned char *md, MD2_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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void MD5_Init(MD5_CTX *c);
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void MD5_Update(MD5_CTX *c, const unsigned char *data,
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unsigned long len);
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void MD5_Final(unsigned char *md, MD5_CTX *c);
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=head1 DESCRIPTION
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2000-02-03 23:23:24 +00:00
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MD2 and MD5 are cryptographic hash functions with a 128 bit output.
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2000-02-03 18:22:01 +00:00
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MD2() and MD5() compute the MD2 and MD5 message digest of the B<n>
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bytes at B<d> and place it in B<md> (which must have space for
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MD2_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes of output). If
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B<md> is NULL, the digest 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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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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MD5_Init(), MD5_Update() and MD5_Final() are analogous using an
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B<MD5_CTX> structure.
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=head1 NOTE
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MD2 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() and MD5() return pointers to the hash value.
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MD2_Init(), MD2_Update() MD2_Final(), MD5_Init(), MD5_Update() and
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MD5_Final() do not return values.
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=head1 CONFORMING TO
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RFC 1319, RFC 1321
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=head1 SEE ALSO
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L<sha(3)|sha(3)>, L<ripemd(3)|ripemd(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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=cut
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