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 **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.

       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's length in hexadecimal or decimal digits, and 0 on
       error.

       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

       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.