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BN_bn2dec.3
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If \fBret\fR is \&\s-1NULL\s0, a new \fB\s-1BIGNUM\s0\fR is created. .PP \&\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return printable strings containing the hexadecimal and decimal encoding of \fBa\fR respectively. For negative numbers, the string is prefaced with a leading '\-'. The string must be freed later using \fIOPENSSL_free()\fR. .PP \&\fIBN_hex2bn()\fR converts the string \fBstr\fR containing a hexadecimal number to a \fB\s-1BIGNUM\s0\fR and stores it in **\fBbn\fR. If *\fBbn\fR is \s-1NULL\s0, a new \&\fB\s-1BIGNUM\s0\fR is created. If \fBbn\fR is \s-1NULL\s0, it only computes the number's length in hexadecimal digits. If the string starts with '\-', the number is negative. A \*(L"negative zero\*(R" is converted to zero. \&\fIBN_dec2bn()\fR is the same using the decimal system. .PP \&\fIBN_print()\fR and \fIBN_print_fp()\fR write the hexadecimal encoding of \fBa\fR, with a leading '\-' for negative numbers, to the \fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR \&\fBfp\fR. .PP \&\fIBN_bn2mpi()\fR and \fIBN_mpi2bn()\fR convert \fB\s-1BIGNUM\s0\fRs 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 \s-1MSB\s0 set is prefixed with null byte). .PP \&\fIBN_bn2mpi()\fR stores the representation of \fBa\fR at \fBto\fR, where \fBto\fR must be large enough to hold the result. The size can be determined by calling BN_bn2mpi(\fBa\fR, \s-1NULL\s0). .PP \&\fIBN_mpi2bn()\fR converts the \fBlen\fR bytes long representation at \fBs\fR to a \fB\s-1BIGNUM\s0\fR and stores it at \fBret\fR, or in a newly allocated \fB\s-1BIGNUM\s0\fR if \fBret\fR is \s-1NULL\s0. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIBN_bn2bin()\fR returns the length of the big-endian number placed at \fBto\fR. \&\fIBN_bin2bn()\fR returns the \fB\s-1BIGNUM\s0\fR, \s-1NULL\s0 on error. .PP \&\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return a null-terminated string, or \s-1NULL\s0 on error. \fIBN_hex2bn()\fR and \fIBN_dec2bn()\fR return the number's length in hexadecimal or decimal digits, and 0 on error. .PP \&\fIBN_print_fp()\fR and \fIBN_print()\fR return 1 on success, 0 on write errors. .PP \&\fIBN_bn2mpi()\fR returns the length of the representation. \fIBN_mpi2bn()\fR returns the \fB\s-1BIGNUM\s0\fR, and \s-1NULL\s0 on error. .PP The error codes can be obtained by \fIERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_zero\fR\|(3), \&\fIASN1_INTEGER_to_BN\fR\|(3), \&\fIBN_num_bytes\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fIBN_bn2bin()\fR, \fIBN_bin2bn()\fR, \fIBN_print_fp()\fR and \fIBN_print()\fR are available in all versions of SSLeay and OpenSSL. .PP \&\fIBN_bn2hex()\fR, \fIBN_bn2dec()\fR, \fIBN_hex2bn()\fR, \fIBN_dec2bn()\fR, \fIBN_bn2mpi()\fR and \&\fIBN_mpi2bn()\fR were added in SSLeay 0.9.0.