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BN_clear_free.3ssl
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BIGNUM *BN_new(void); \& \& void BN_init(BIGNUM *); \& \& void BN_clear(BIGNUM *a); \& \& void BN_free(BIGNUM *a); \& \& void BN_clear_free(BIGNUM *a); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fBBN_init()\fR initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR. .PP \&\fBBN_clear()\fR is used to destroy sensitive data such as keys when they are no longer needed. It erases the memory used by \fBa\fR and sets it to the value 0. .PP \&\fBBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created by \fBBN_new()\fR, also the structure itself. \fBBN_clear_free()\fR additionally overwrites the data before the memory is returned to the system. If \fBa\fR is \s-1NULL,\s0 nothing is done. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR initialised to the value 0. If the allocation fails, it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by \fBERR_get_error\fR\|(3). .PP \&\fBBN_init()\fR, \fBBN_clear()\fR, \fBBN_free()\fR and \fBBN_clear_free()\fR have no return values. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3), \fBERR_get_error\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_new()\fR, \fBBN_clear()\fR, \fBBN_free()\fR and \fBBN_clear_free()\fR are available in all versions on SSLeay and OpenSSL. \fBBN_init()\fR was added in SSLeay 0.9.1b.
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