BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn,
BN_dec2bn, BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn -
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 );
The BN_bn2bin() function converts the absolute value of a
into big-endian form and stores it at to. The to value
must point to BN_num_bytes(a) bytes of memory.
The BN_bin2bn() function 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.
The BN_bn2hex() and BN_bn2dec() functions 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 **bn. If *bn is
NULL, a new BIGNUM is created. If bn is NULL, it only computes
the number's length in hexadecimal digits. If the
string starts with '-', the number is negative.
BN_dec2bn() is the same using the decimal system.
The BN_print() and BN_print_fp() functions write the hexadecimal
encoding of a, with a leading '-' for negative
numbers, to the BIO or FILE fp.
The BN_bn2mpi() and BN_mpi2bn() functions 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).
The BN_bn2mpi() function 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).
The BN_mpi2bn() function 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.
The BN_bn2bin() function returns the length of the bigendian
number placed at to. The BN_bin2bn() function
returns the BIGNUM, NULL on error.
The BN_bn2hex() and BN_bn2dec() functions return a nullterminated
string, or NULL on error. The BN_hex2bn() and
BN_dec2bn() functions return the number's length in hexadecimal
or decimal digits, and 0 on error.
The BN_print_fp() and BN_print() functions return 1 on
success, 0 on write errors.
The BN_bn2mpi() function returns the length of the representation.
The BN_mpi2bn() function returns the BIGNUM,
and NULL on error.
The error codes can be obtained by using the
ERR_get_error() function.
The BN_bn2bin(), BN_bin2bn(), BN_print_fp(), and
BN_print() functions are available in all versions of
SSLeay and OpenSSL.
The BN_bn2hex(), BN_bn2dec(), BN_hex2bn(), BN_dec2bn(),
BN_bn2mpi(), and BN_mpi2bn() functions were added in
SSLeay 0.9.0.
Functions: bn(3), err(3), BN_zero(3), ASN1_INTEGER_to_BN(3), BN_num_bytes(3)
BN_bn2bin(3)
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