| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
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| 6 | MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions
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| 7 |
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| 8 | =head1 SYNOPSIS
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| 9 |
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| 10 | #include <openssl/md2.h>
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| 11 |
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| 12 | unsigned char *MD2(const unsigned char *d, unsigned long n, unsigned char *md);
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| 13 |
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| 14 | int MD2_Init(MD2_CTX *c);
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| 15 | int MD2_Update(MD2_CTX *c, const unsigned char *data, unsigned long len);
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| 16 | int MD2_Final(unsigned char *md, MD2_CTX *c);
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| 17 |
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| 18 |
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| 19 | #include <openssl/md4.h>
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| 20 |
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| 21 | unsigned char *MD4(const unsigned char *d, unsigned long n, unsigned char *md);
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| 22 |
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| 23 | int MD4_Init(MD4_CTX *c);
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| 24 | int MD4_Update(MD4_CTX *c, const void *data, unsigned long len);
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| 25 | int MD4_Final(unsigned char *md, MD4_CTX *c);
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| 26 |
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| 27 |
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| 28 | #include <openssl/md5.h>
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| 29 |
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| 30 | unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);
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| 31 |
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| 32 | int MD5_Init(MD5_CTX *c);
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| 33 | int MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
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| 34 | int MD5_Final(unsigned char *md, MD5_CTX *c);
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| 35 |
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| 36 | =head1 DESCRIPTION
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| 37 |
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| 38 | MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.
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| 39 |
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| 40 | MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest
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| 41 | of the B<n> bytes at B<d> and place it in B<md> (which must have space
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| 42 | for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16
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| 43 | bytes of output). If B<md> is NULL, the digest is placed in a static
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| 44 | array.
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| 45 |
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| 46 | The following functions may be used if the message is not completely
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| 47 | stored in memory:
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| 48 |
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| 49 | MD2_Init() initializes a B<MD2_CTX> structure.
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| 50 |
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| 51 | MD2_Update() can be called repeatedly with chunks of the message to
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| 52 | be hashed (B<len> bytes at B<data>).
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| 53 |
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| 54 | MD2_Final() places the message digest in B<md>, which must have space
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| 55 | for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MD2_CTX>.
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| 56 |
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| 57 | MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and
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| 58 | MD5_Final() are analogous using an B<MD4_CTX> and B<MD5_CTX> structure.
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| 59 |
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| 60 | Applications should use the higher level functions
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| 61 | L<EVP_DigestInit(3)>
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| 62 | etc. instead of calling the hash functions directly.
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| 63 |
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| 64 | =head1 NOTE
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| 65 |
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| 66 | MD2, MD4, and MD5 are recommended only for compatibility with existing
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| 67 | applications. In new applications, SHA-1 or RIPEMD-160 should be
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| 68 | preferred.
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| 69 |
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| 70 | =head1 RETURN VALUES
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| 71 |
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| 72 | MD2(), MD4(), and MD5() return pointers to the hash value.
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| 73 |
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| 74 | MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(),
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| 75 | MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for
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| 76 | success, 0 otherwise.
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| 77 |
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| 78 | =head1 CONFORMING TO
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| 79 |
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| 80 | RFC 1319, RFC 1320, RFC 1321
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| 81 |
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| 82 | =head1 SEE ALSO
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| 83 |
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| 84 | L<EVP_DigestInit(3)>
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| 85 |
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| 86 | =head1 COPYRIGHT
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| 87 |
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| 88 | Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 89 |
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| 90 | Licensed under the OpenSSL license (the "License"). You may not use
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| 91 | this file except in compliance with the License. You can obtain a copy
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| 92 | in the file LICENSE in the source distribution or at
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| 93 | L<https://www.openssl.org/source/license.html>.
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| 94 |
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| 95 | =cut
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