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<?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>BN_bn2bin</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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="#see_also">SEE ALSO</a></li> <li><a href="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>BN_bn2binpad, BN_bn2bin, BN_bin2bn, BN_bn2lebinpad, BN_lebin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn, BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn - format conversions</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/bn.h></pre> <pre> int BN_bn2bin(const BIGNUM *a, unsigned char *to); int BN_bn2binpad(const BIGNUM *a, unsigned char *to, int tolen); BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);</pre> <pre> int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen); BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret);</pre> <pre> char *BN_bn2hex(const BIGNUM *a); char *BN_bn2dec(const BIGNUM *a); int BN_hex2bn(BIGNUM **a, const char *str); int BN_dec2bn(BIGNUM **a, const char *str);</pre> <pre> int BN_print(BIO *fp, const BIGNUM *a); int BN_print_fp(FILE *fp, const BIGNUM *a);</pre> <pre> int BN_bn2mpi(const BIGNUM *a, unsigned char *to); BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>BN_bn2bin() converts the absolute value of <strong>a</strong> into big-endian form and stores it at <strong>to</strong>. <strong>to</strong> must point to BN_num_bytes(<strong>a</strong>) bytes of memory.</p> <p>BN_bn2binpad() also converts the absolute value of <strong>a</strong> into big-endian form and stores it at <strong>to</strong>. <strong>tolen</strong> indicates the length of the output buffer <strong>to</strong>. The result is padded with zeros if necessary. If <strong>tolen</strong> is less than BN_num_bytes(<strong>a</strong>) an error is returned.</p> <p>BN_bin2bn() converts the positive integer in big-endian form of length <strong>len</strong> at <strong>s</strong> into a <strong>BIGNUM</strong> and places it in <strong>ret</strong>. If <strong>ret</strong> is NULL, a new <strong>BIGNUM</strong> is created.</p> <p>BN_bn2lebinpad() and BN_lebin2bn() are identical to BN_bn2binpad() and BN_bin2bn() except the buffer is in little-endian format.</p> <p>BN_bn2hex() and BN_bn2dec() return printable strings containing the hexadecimal and decimal encoding of <strong>a</strong> respectively. For negative numbers, the string is prefaced with a leading '-'. The string must be freed later using <code>OPENSSL_free()</code>.</p> <p>BN_hex2bn() takes as many characters as possible from the string <strong>str</strong>, including the leading character '-' which means negative, to form a valid hexadecimal number representation and converts them to a <strong>BIGNUM</strong> and stores it in **<strong>a</strong>. If *<strong>a</strong> is NULL, a new <strong>BIGNUM</strong> is created. If <strong>a</strong> is NULL, it only computes the length of valid representation. A "negative zero" is converted to zero. BN_dec2bn() is the same using the decimal system.</p> <p><code>BN_print()</code> and <code>BN_print_fp()</code> write the hexadecimal encoding of <strong>a</strong>, with a leading '-' for negative numbers, to the <strong>BIO</strong> or <strong>FILE</strong> <strong>fp</strong>.</p> <p>BN_bn2mpi() and BN_mpi2bn() convert <strong>BIGNUM</strong>s from and to a format that consists of the number's length in bytes represented as a 4-byte big-endian number, and the number itself in big-endian format, where the most significant bit signals a negative number (the representation of numbers with the MSB set is prefixed with null byte).</p> <p>BN_bn2mpi() stores the representation of <strong>a</strong> at <strong>to</strong>, where <strong>to</strong> must be large enough to hold the result. The size can be determined by calling BN_bn2mpi(<strong>a</strong>, NULL).</p> <p>BN_mpi2bn() converts the <strong>len</strong> bytes long representation at <strong>s</strong> to a <strong>BIGNUM</strong> and stores it at <strong>ret</strong>, or in a newly allocated <strong>BIGNUM</strong> if <strong>ret</strong> is NULL.</p> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></h1> <p>BN_bn2bin() returns the length of the big-endian number placed at <strong>to</strong>. BN_bin2bn() returns the <strong>BIGNUM</strong>, NULL on error.</p> <p>BN_bn2binpad() returns the number of bytes written or -1 if the supplied buffer is too small.</p> <p>BN_bn2hex() and BN_bn2dec() return a null-terminated string, or NULL on error. BN_hex2bn() and BN_dec2bn() return the number of characters used in parsing, or 0 on error, in which case no new <strong>BIGNUM</strong> will be created.</p> <p><code>BN_print_fp()</code> and <code>BN_print()</code> return 1 on success, 0 on write errors.</p> <p>BN_bn2mpi() returns the length of the representation. BN_mpi2bn() returns the <strong>BIGNUM</strong>, and NULL on error.</p> <p>The error codes can be obtained by <em>ERR_get_error(3)</em>.</p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>ERR_get_error(3)</em>, <em>BN_zero(3)</em>, <em>ASN1_INTEGER_to_BN(3)</em>, <em>BN_num_bytes(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></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>