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BN_CTX_end.3
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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 \fIERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIBN_CTX_new\fR\|(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.