53934822ac
Files like dh.pod, etc., mostly duplicated the API-specific pod files. Removed the duplicated content; that often mean the whole file could be removed. Some of the content about internals got moved into README files in the source tree. Some content (e.g., err.pod) got moved into other pod pages. Annotate generic pages, remove dup NAME Reviewed-by: Richard Levitte <levitte@openssl.org>
101 lines
2.8 KiB
Text
101 lines
2.8 KiB
Text
=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)>
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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<EVP_DigestInit(3)>
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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