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135 .TH BN_new 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 BN_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/bn.h>
147 \& BIGNUM *BN_new(void);
149 \& void BN_init(BIGNUM *);
151 \& void BN_clear(BIGNUM *a);
153 \& void BN_free(BIGNUM *a);
155 \& void BN_clear_free(BIGNUM *a);
158 .IX Header "DESCRIPTION"
159 \&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fIBN_init()\fR
160 initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR.
162 \&\fIBN_clear()\fR is used to destroy sensitive data such as keys when they
163 are no longer needed. It erases the memory used by \fBa\fR and sets it
166 \&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
167 by \fIBN_new()\fR, also the structure itself. \fIBN_clear_free()\fR additionally
168 overwrites the data before the memory is returned to the system.
170 .IX Header "RETURN VALUES"
171 \&\fIBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR. If the allocation fails,
172 it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained
173 by \fIERR_get_error\fR\|(3).
175 \&\fIBN_init()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR have no return
178 .IX Header "SEE ALSO"
179 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3)
182 \&\fIBN_new()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR are available in
183 all versions on SSLeay and OpenSSL. \fIBN_init()\fR was added in SSLeay