BN_BN2BIN - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBN_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
SYNOPSIS​ #include <openssl/bn.h> ​ ​ 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); ​ ​ int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen); ​ BIGNUM *BN_lebin2bn(const unsigned char *s, int len, BIGNUM *ret); ​ ​ 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); ​ ​ int BN_print(BIO *fp, const BIGNUM *a); ​ int BN_print_fp(FILE *fp, const BIGNUM *a); ​ ​ int BN_bn2mpi(const BIGNUM *a, unsigned char *to); ​ BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);
DESCRIPTION​BN_bn2bin() converts the absolute value of a into big-endian form and stores it at to. to must point to BN_num_bytes(a) bytes of memory. ​BN_bn2binpad() also converts the absolute value of a into big-endian form and stores it at to. tolen indicates the length of the output buffer ​to. The result is padded with zeros if necessary. If tolen is less than BN_num_bytes(a) an error is returned. ​BN_bin2bn() converts the positive integer in big-endian form of length ​len at s into a BIGNUM and places it in ret. If ret is ​NULL, a new BIGNUM is created. ​BN_bn2lebinpad() and BN_lebin2bn() are identical to BN_bn2binpad() and ​BN_bin2bn() except the buffer is in little-endian format. ​BN_bn2hex() and BN_bn2dec() return printable strings containing the hexadecimal and decimal encoding of a respectively. For negative numbers, the string is prefaced with a leading '−'. The string must be freed later using OPENSSL_free(). ​BN_hex2bn() takes as many characters as possible from the string str, including the leading character '−' which means negative, to form a valid hexadecimal number representation and converts them to a BIGNUM and stores it in **a. If *a is NULL, a new BIGNUM is created. If ​a 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. ​BN_print() and BN_print_fp() write the hexadecimal encoding of a, with a leading '−' for negative numbers, to the BIO or FILE ​fp. ​BN_bn2mpi() and BN_mpi2bn() convert BIGNUMs 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). ​BN_bn2mpi() stores the representation of a at to, where to must be large enough to hold the result. The size can be determined by calling BN_bn2mpi(a, NULL). ​BN_mpi2bn() converts the len bytes long representation at s to a BIGNUM and stores it at ret, or in a newly allocated BIGNUM if ret is NULL.
RETURN VALUES​BN_bn2bin() returns the length of the big-endian number placed at to. ​BN_bin2bn() returns the BIGNUM, NULL on error. ​BN_bn2binpad() returns the number of bytes written or −1 if the supplied buffer is too small. ​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 BIGNUM will be created. ​BN_print_fp() and BN_print() return 1 on success, 0 on write errors. ​BN_bn2mpi() returns the length of the representation. BN_mpi2bn() returns the BIGNUM, and NULL on error. The error codes can be obtained by ERR_get_error (3).
SEE ALSO​ERR_get_error (3), BN_zero (3), ​ASN1_INTEGER_to_BN (3), ​BN_num_bytes (3)
COPYRIGHTCopyright 2000−2020 The OpenSSL Project Authors. All Rights Reserved. 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 <https://www.openssl.org/source/license.html>. 0
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