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140 .IX Title "BN_BN2BIN 1"
141 .TH BN_BN2BIN 1 "perl v5.6.1" "2000-11-13" "User Contributed Perl Documentation"
144 BN_bn2bin, BN_bin2bn, BN_bn2hex, BN_bn2dec, BN_hex2bn, BN_dec2bn,
145 BN_print, BN_print_fp, BN_bn2mpi, BN_mpi2bn \- format conversions
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/bn.h>
152 \& int BN_bn2bin(const BIGNUM *a, unsigned char *to);
153 \& BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret);
156 \& char *BN_bn2hex(const BIGNUM *a);
157 \& char *BN_bn2dec(const BIGNUM *a);
158 \& int BN_hex2bn(BIGNUM **a, const char *str);
159 \& int BN_dec2bn(BIGNUM **a, const char *str);
162 \& int BN_print(BIO *fp, const BIGNUM *a);
163 \& int BN_print_fp(FILE *fp, const BIGNUM *a);
166 \& int BN_bn2mpi(const BIGNUM *a, unsigned char *to);
167 \& BIGNUM *BN_mpi2bn(unsigned char *s, int len, BIGNUM *ret);
170 .IX Header "DESCRIPTION"
171 \&\fIBN_bn2bin()\fR converts the absolute value of \fBa\fR into big-endian form
172 and stores it at \fBto\fR. \fBto\fR must point to BN_num_bytes(\fBa\fR) bytes of
175 \&\fIBN_bin2bn()\fR converts the positive integer in big-endian form of length
176 \&\fBlen\fR at \fBs\fR into a \fB\s-1BIGNUM\s0\fR and places it in \fBret\fR. If \fBret\fR is
177 \&\s-1NULL\s0, a new \fB\s-1BIGNUM\s0\fR is created.
179 \&\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return printable strings containing the
180 hexadecimal and decimal encoding of \fBa\fR respectively. For negative
181 numbers, the string is prefaced with a leading '\-'. The string must be
182 freed later using \fIOPENSSL_free()\fR.
184 \&\fIBN_hex2bn()\fR converts the string \fBstr\fR containing a hexadecimal number
185 to a \fB\s-1BIGNUM\s0\fR and stores it in **\fBbn\fR. If *\fBbn\fR is \s-1NULL\s0, a new
186 \&\fB\s-1BIGNUM\s0\fR is created. If \fBbn\fR is \s-1NULL\s0, it only computes the number's
187 length in hexadecimal digits. If the string starts with '\-', the
188 number is negative. \fIBN_dec2bn()\fR is the same using the decimal system.
190 \&\fIBN_print()\fR and \fIBN_print_fp()\fR write the hexadecimal encoding of \fBa\fR,
191 with a leading '\-' for negative numbers, to the \fB\s-1BIO\s0\fR or \fB\s-1FILE\s0\fR
194 \&\fIBN_bn2mpi()\fR and \fIBN_mpi2bn()\fR convert \fB\s-1BIGNUM\s0\fRs from and to a format
195 that consists of the number's length in bytes represented as a 3\-byte
196 big-endian number, and the number itself in big-endian format, where
197 the most significant bit signals a negative number (the representation
198 of numbers with the \s-1MSB\s0 set is prefixed with null byte).
200 \&\fIBN_bn2mpi()\fR stores the representation of \fBa\fR at \fBto\fR, where \fBto\fR
201 must be large enough to hold the result. The size can be determined by
202 calling BN_bn2mpi(\fBa\fR, \s-1NULL\s0).
204 \&\fIBN_mpi2bn()\fR converts the \fBlen\fR bytes long representation at \fBs\fR to
205 a \fB\s-1BIGNUM\s0\fR and stores it at \fBret\fR, or in a newly allocated \fB\s-1BIGNUM\s0\fR
206 if \fBret\fR is \s-1NULL\s0.
208 .IX Header "RETURN VALUES"
209 \&\fIBN_bn2bin()\fR returns the length of the big-endian number placed at \fBto\fR.
210 \&\fIBN_bin2bn()\fR returns the \fB\s-1BIGNUM\s0\fR, \s-1NULL\s0 on error.
212 \&\fIBN_bn2hex()\fR and \fIBN_bn2dec()\fR return a null-terminated string, or \s-1NULL\s0
213 on error. \fIBN_hex2bn()\fR and \fIBN_dec2bn()\fR return the number's length in
214 hexadecimal or decimal digits, and 0 on error.
216 \&\fIBN_print_fp()\fR and \fIBN_print()\fR return 1 on success, 0 on write errors.
218 \&\fIBN_bn2mpi()\fR returns the length of the representation. \fIBN_mpi2bn()\fR
219 returns the \fB\s-1BIGNUM\s0\fR, and \s-1NULL\s0 on error.
221 The error codes can be obtained by ERR_get_error(3).
223 .IX Header "SEE ALSO"
224 bn(3), err(3), BN_zero(3),
225 ASN1_INTEGER_to_BN(3),
229 \&\fIBN_bn2bin()\fR, \fIBN_bin2bn()\fR, \fIBN_print_fp()\fR and \fIBN_print()\fR are available
230 in all versions of SSLeay and OpenSSL.
232 \&\fIBN_bn2hex()\fR, \fIBN_bn2dec()\fR, \fIBN_hex2bn()\fR, \fIBN_dec2bn()\fR, \fIBN_bn2mpi()\fR and
233 \&\fIBN_mpi2bn()\fR were added in SSLeay 0.9.0.