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SHA256_Init.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>SHA256_Init</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#CONFORMING-TO">CONFORMING TO</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>SHA1, SHA1_Init, SHA1_Update, SHA1_Final, SHA224, SHA224_Init, SHA224_Update, SHA224_Final, SHA256, SHA256_Init, SHA256_Update, SHA256_Final, SHA384, SHA384_Init, SHA384_Update, SHA384_Final, SHA512, SHA512_Init, SHA512_Update, SHA512_Final - Secure Hash Algorithm</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/sha.h> int SHA1_Init(SHA_CTX *c); int SHA1_Update(SHA_CTX *c, const void *data, size_t len); int SHA1_Final(unsigned char *md, SHA_CTX *c); unsigned char *SHA1(const unsigned char *d, size_t n, unsigned char *md); int SHA224_Init(SHA256_CTX *c); int SHA224_Update(SHA256_CTX *c, const void *data, size_t len); int SHA224_Final(unsigned char *md, SHA256_CTX *c); unsigned char *SHA224(const unsigned char *d, size_t n, unsigned char *md); int SHA256_Init(SHA256_CTX *c); int SHA256_Update(SHA256_CTX *c, const void *data, size_t len); int SHA256_Final(unsigned char *md, SHA256_CTX *c); unsigned char *SHA256(const unsigned char *d, size_t n, unsigned char *md); int SHA384_Init(SHA512_CTX *c); int SHA384_Update(SHA512_CTX *c, const void *data, size_t len); int SHA384_Final(unsigned char *md, SHA512_CTX *c); unsigned char *SHA384(const unsigned char *d, size_t n, unsigned char *md); int SHA512_Init(SHA512_CTX *c); int SHA512_Update(SHA512_CTX *c, const void *data, size_t len); int SHA512_Final(unsigned char *md, SHA512_CTX *c); unsigned char *SHA512(const unsigned char *d, size_t n, unsigned char *md);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>Applications should use the higher level functions <a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a> etc. instead of calling the hash functions directly.</p> <p>SHA-1 (Secure Hash Algorithm) is a cryptographic hash function with a 160 bit output.</p> <p>SHA1() computes the SHA-1 message digest of the <b>n</b> bytes at <b>d</b> and places it in <b>md</b> (which must have space for SHA_DIGEST_LENGTH == 20 bytes of output). If <b>md</b> is NULL, the digest is placed in a static array. Note: setting <b>md</b> to NULL is <b>not thread safe</b>.</p> <p>The following functions may be used if the message is not completely stored in memory:</p> <p>SHA1_Init() initializes a <b>SHA_CTX</b> structure.</p> <p>SHA1_Update() can be called repeatedly with chunks of the message to be hashed (<b>len</b> bytes at <b>data</b>).</p> <p>SHA1_Final() places the message digest in <b>md</b>, which must have space for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the <b>SHA_CTX</b>.</p> <p>The SHA224, SHA256, SHA384 and SHA512 families of functions operate in the same way as for the SHA1 functions. Note that SHA224 and SHA256 use a <b>SHA256_CTX</b> object instead of <b>SHA_CTX</b>. SHA384 and SHA512 use <b>SHA512_CTX</b>. The buffer <b>md</b> must have space for the output from the SHA variant being used (defined by SHA224_DIGEST_LENGTH, SHA256_DIGEST_LENGTH, SHA384_DIGEST_LENGTH and SHA512_DIGEST_LENGTH). Also note that, as for the SHA1() function above, the SHA224(), SHA256(), SHA384() and SHA512() functions are not thread safe if <b>md</b> is NULL.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>SHA1(), SHA224(), SHA256(), SHA384() and SHA512() return a pointer to the hash value.</p> <p>SHA1_Init(), SHA1_Update() and SHA1_Final() and equivalent SHA224, SHA256, SHA384 and SHA512 functions return 1 for success, 0 otherwise.</p> <h1 id="CONFORMING-TO">CONFORMING TO</h1> <p>US Federal Information Processing Standard FIPS PUB 180-4 (Secure Hash Standard), ANSI X9.30</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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