148 lines
5.7 KiB
HTML
Executable File
148 lines
5.7 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>SHA256_Init</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#conforming_to">CONFORMING TO</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#history">HISTORY</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update,
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SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384,
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SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update,
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SHA512_Final - Secure Hash Algorithm</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/sha.h></pre>
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<p>Deprecated since OpenSSL 3.0, can be hidden entirely by defining
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<strong>OPENSSL_API_COMPAT</strong> with a suitable version value, see
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<em>openssl_user_macros(7)</em>:</p>
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<pre>
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int SHA1_Init(SHA_CTX *c);
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int SHA1_Update(SHA_CTX *c, const void *data, size_t len);
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int SHA1_Final(unsigned char *md, SHA_CTX *c);
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unsigned char *SHA1(const unsigned char *d, size_t n,
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unsigned char *md);</pre>
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<pre>
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int SHA224_Init(SHA256_CTX *c);
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int SHA224_Update(SHA256_CTX *c, const void *data, size_t len);
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int SHA224_Final(unsigned char *md, SHA256_CTX *c);
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unsigned char *SHA224(const unsigned char *d, size_t n,
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unsigned char *md);</pre>
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<pre>
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int SHA256_Init(SHA256_CTX *c);
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int SHA256_Update(SHA256_CTX *c, const void *data, size_t len);
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int SHA256_Final(unsigned char *md, SHA256_CTX *c);
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unsigned char *SHA256(const unsigned char *d, size_t n,
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unsigned char *md);</pre>
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<pre>
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int SHA384_Init(SHA512_CTX *c);
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int SHA384_Update(SHA512_CTX *c, const void *data, size_t len);
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int SHA384_Final(unsigned char *md, SHA512_CTX *c);
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unsigned char *SHA384(const unsigned char *d, size_t n,
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unsigned char *md);</pre>
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<pre>
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int SHA512_Init(SHA512_CTX *c);
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int SHA512_Update(SHA512_CTX *c, const void *data, size_t len);
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int SHA512_Final(unsigned char *md, SHA512_CTX *c);
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unsigned char *SHA512(const unsigned char *d, size_t n,
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unsigned char *md);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>All of the functions described on this page are deprecated.
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Applications should instead use <em>EVP_DigestInit_ex(3)</em>, <em>EVP_DigestUpdate(3)</em>
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and <em>EVP_DigestFinal_ex(3)</em>.</p>
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<p>SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a
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160 bit output.</p>
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<p>SHA1() computes the SHA-1 message digest of the <strong>n</strong>
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bytes at <strong>d</strong> and places it in <strong>md</strong> (which must have space for
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SHA_DIGEST_LENGTH == 20 bytes of output). If <strong>md</strong> is NULL, the digest
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is placed in a static array. Note: setting <strong>md</strong> to NULL is <strong>not thread safe</strong>.</p>
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<p>The following functions may be used if the message is not completely
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stored in memory:</p>
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<p>SHA1_Init() initializes a <strong>SHA_CTX</strong> structure.</p>
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<p>SHA1_Update() can be called repeatedly with chunks of the message to
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be hashed (<strong>len</strong> bytes at <strong>data</strong>).</p>
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<p>SHA1_Final() places the message digest in <strong>md</strong>, which must have space
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for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the <strong>SHA_CTX</strong>.</p>
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<p>The SHA224, SHA256, SHA384 and SHA512 families of functions operate in the
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same way as for the SHA1 functions. Note that SHA224 and SHA256 use a
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<strong>SHA256_CTX</strong> object instead of <strong>SHA_CTX</strong>. SHA384 and SHA512 use <strong>SHA512_CTX</strong>.
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The buffer <strong>md</strong> must have space for the output from the SHA variant being used
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(defined by SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH and
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SHA512_DIGEST_LENGTH). Also note that, as for the SHA1() function above, the
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SHA224(), SHA256(), SHA384() and SHA512() functions are not thread safe if
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<strong>md</strong> is NULL.</p>
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<p>The predecessor of SHA-1, SHA, is also implemented, but it should be
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used only when backward compatibility is required.</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p>SHA1(), SHA224(), SHA256(), SHA384() and SHA512() return a pointer to the hash
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value.</p>
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<p>SHA1_Init(), SHA1_Update() and SHA1_Final() and equivalent SHA224, SHA256,
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SHA384 and SHA512 functions return 1 for success, 0 otherwise.</p>
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<p>
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</p>
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<hr />
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<h1><a name="conforming_to">CONFORMING TO</a></h1>
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<p>US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash
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Standard),
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ANSI X9.30</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>EVP_DigestInit(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="history">HISTORY</a></h1>
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<p>All of these functions were deprecated in OpenSSL 3.0.</p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (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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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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