BN_bn2bin - BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn, format conversions
#include <openssl/bn.h> int BN_bn2bin(const BIGNUM *a, unsigned char *to); BIGNUM *BN_bin2bn(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);
BN_bn2bin(3openssl) OpenSSL BN_bn2bin(3openssl)
NAME
BN_bn2bin, BN_bin2bn, 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);
BIGNUM *BN_bin2bn(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_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_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() converts the string str containing a hexadecimal number 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 number's length in hexadecimal
digits. If the string starts with '-', the number is negative. 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_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).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | library/security/openssl |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
SEE ALSO
bn(3), ERR_get_error(3), BN_zero(3), ASN1_INTEGER_to_BN(3),
BN_num_bytes(3)
HISTORY
BN_bn2bin(), BN_bin2bn(), BN_print_fp() and BN_print() are available in
all versions of SSLeay and OpenSSL.
BN_bn2hex(), BN_bn2dec(), BN_hex2bn(), BN_dec2bn(), BN_bn2mpi() and
BN_mpi2bn() were added in SSLeay 0.9.0.
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://www.openssl.org/source/openssl-1.0.2ze.tar.gz.
Further information about this software can be found on the open source
community website at https://www.openssl.org/.
1.0.2ze 2022-05-03 BN_bn2bin(3openssl)