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124 .\" ========================================================================
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126 .IX Title "BN_new 3"
127 .TH BN_new 3 "2007-10-24" "0.9.8g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
130 .if n .ad l
131 .nh
132 .SH "NAME"
133 BN_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs
134 .SH "SYNOPSIS"
135 .IX Header "SYNOPSIS"
136 .Vb 1
137 \& #include <openssl/bn.h>
138 \&
139 \& BIGNUM *BN_new(void);
140 \&
141 \& void BN_init(BIGNUM *);
142 \&
143 \& void BN_clear(BIGNUM *a);
144 \&
145 \& void BN_free(BIGNUM *a);
146 \&
147 \& void BN_clear_free(BIGNUM *a);
148 .Ve
149 .SH "DESCRIPTION"
150 .IX Header "DESCRIPTION"
151 \&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fIBN_init()\fR
152 initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR.
153 .PP
154 \&\fIBN_clear()\fR is used to destroy sensitive data such as keys when they
155 are no longer needed. It erases the memory used by \fBa\fR and sets it
156 to the value 0.
157 .PP
158 \&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
159 by \fIBN_new()\fR, also the structure itself. \fIBN_clear_free()\fR additionally
160 overwrites the data before the memory is returned to the system.
161 .SH "RETURN VALUES"
162 .IX Header "RETURN VALUES"
163 \&\fIBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR. If the allocation fails,
164 it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained
165 by \fIERR_get_error\fR\|(3).
166 .PP
167 \&\fIBN_init()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR have no return
168 values.
169 .SH "SEE ALSO"
170 .IX Header "SEE ALSO"
171 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3)
172 .SH "HISTORY"
173 .IX Header "HISTORY"
174 \&\fIBN_new()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR are available in
175 all versions on SSLeay and OpenSSL. \fIBN_init()\fR was added in SSLeay
176 0.9.1b.