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BN_CTX_init.3
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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_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BN_CTX *BN_CTX_new(void); \& \& void BN_CTX_free(BN_CTX *c); .Ve .PP Deprecated: .PP .Vb 1 \& void BN_CTX_init(BN_CTX *c); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs is rather expensive when used in conjunction with repeated subroutine calls, the \fB\s-1BN_CTX\s0\fR structure is used. .PP \&\fBBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR structure. .PP \&\fBBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was created by \fBBN_CTX_new()\fR, also the structure itself. If \fBBN_CTX_start\fR\|(3) has been used on the \fB\s-1BN_CTX\s0\fR, \&\fBBN_CTX_end\fR\|(3) must be called before the \fB\s-1BN_CTX\s0\fR may be freed by \fBBN_CTX_free()\fR. .PP \&\fBBN_CTX_init()\fR (deprecated) initializes an existing uninitialized \fB\s-1BN_CTX\s0\fR. This should not be used for new programs. Use \fBBN_CTX_new()\fR instead. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. 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_CTX_init()\fR and \fBBN_CTX_free()\fR have no return values. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3), \fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3), \&\fBBN_CTX_start\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_CTX_new()\fR and \fBBN_CTX_free()\fR are available in all versions on SSLeay and OpenSSL. \fBBN_CTX_init()\fR was added in SSLeay 0.9.1b.
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