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132 .TH BN_new 3 "2006-11-19" "0.9.8d" "OpenSSL"
134 BN_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/bn.h>
142 \& BIGNUM *BN_new(void);
146 \& void BN_init(BIGNUM *);
150 \& void BN_clear(BIGNUM *a);
154 \& void BN_free(BIGNUM *a);
158 \& void BN_clear_free(BIGNUM *a);
161 .IX Header "DESCRIPTION"
162 \&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fIBN_init()\fR
163 initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR.
165 \&\fIBN_clear()\fR is used to destroy sensitive data such as keys when they
166 are no longer needed. It erases the memory used by \fBa\fR and sets it
169 \&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
170 by \fIBN_new()\fR, also the structure itself. \fIBN_clear_free()\fR additionally
171 overwrites the data before the memory is returned to the system.
173 .IX Header "RETURN VALUES"
174 \&\fIBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR. If the allocation fails,
175 it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained
176 by \fIERR_get_error\fR\|(3).
178 \&\fIBN_init()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR have no return
181 .IX Header "SEE ALSO"
182 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3)
185 \&\fIBN_new()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR are available in
186 all versions on SSLeay and OpenSSL. \fIBN_init()\fR was added in SSLeay