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+.\" Automatically generated by Pod::Man version 1.15
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+.\" ======================================================================
+.\"
+.IX Title "BN_CTX_START 1"
+.TH BN_CTX_START 1 "perl v5.6.1" "2000-11-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+BN_CTX_start, BN_CTX_get, BN_CTX_end \- use temporary \s-1BIGNUM\s0 variables
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bn.h>
+.Ve
+.Vb 1
+\& void BN_CTX_start(BN_CTX *ctx);
+.Ve
+.Vb 1
+\& BIGNUM *BN_CTX_get(BN_CTX *ctx);
+.Ve
+.Vb 1
+\& void BN_CTX_end(BN_CTX *ctx);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+These functions are used to obtain temporary \fB\s-1BIGNUM\s0\fR variables from
+a \fB\s-1BN_CTX\s0\fR (which can been created by using BN_CTX_new(3))
+in order to save the overhead of repeatedly creating and
+freeing \fB\s-1BIGNUM\s0\fRs in functions that are called from inside a loop.
+.PP
+A function must call \fIBN_CTX_start()\fR first. Then, \fIBN_CTX_get()\fR may be
+called repeatedly to obtain temporary \fB\s-1BIGNUM\s0\fRs. All \fIBN_CTX_get()\fR
+calls must be made before calling any other functions that use the
+\&\fBctx\fR as an argument.
+.PP
+Finally, \fIBN_CTX_end()\fR must be called before returning from the function.
+When \fIBN_CTX_end()\fR is called, the \fB\s-1BIGNUM\s0\fR pointers obtained from
+\&\fIBN_CTX_get()\fR become invalid.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIBN_CTX_start()\fR and \fIBN_CTX_end()\fR return no values.
+.PP
+\&\fIBN_CTX_get()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR, or \fB\s-1NULL\s0\fR on error.
+Once \fIBN_CTX_get()\fR has failed, the subsequent calls will return \fB\s-1NULL\s0\fR
+as well, so it is sufficient to check the return value of the last
+\&\fIBN_CTX_get()\fR call. In case of an error, an error code is set, which
+can be obtained by ERR_get_error(3).
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+BN_CTX_new(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIBN_CTX_start()\fR, \fIBN_CTX_get()\fR and \fIBN_CTX_end()\fR were added in OpenSSL 0.9.5.
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