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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_start, BN_CTX_get, BN_CTX_end \- use temporary BIGNUM variables .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& void BN_CTX_start(BN_CTX *ctx); \& \& BIGNUM *BN_CTX_get(BN_CTX *ctx); \& \& 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 \fBBN_CTX_new\fR\|(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 \fBBN_CTX_start()\fR first. Then, \fBBN_CTX_get()\fR may be called repeatedly to obtain temporary \fB\s-1BIGNUM\s0\fRs. All \fBBN_CTX_get()\fR calls must be made before calling any other functions that use the \&\fBctx\fR as an argument. .PP Finally, \fBBN_CTX_end()\fR must be called before returning from the function. When \fBBN_CTX_end()\fR is called, the \fB\s-1BIGNUM\s0\fR pointers obtained from \&\fBBN_CTX_get()\fR become invalid. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_CTX_start()\fR and \fBBN_CTX_end()\fR return no values. .PP \&\fBBN_CTX_get()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR, or \fB\s-1NULL\s0\fR on error. Once \fBBN_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 \&\fBBN_CTX_get()\fR call. In case of an error, an error code is set, which can be obtained by \fBERR_get_error\fR\|(3). .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability library/security/openssl = Stability Pass-through uncommitted .TE .PP .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBN_CTX_new\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_CTX_start()\fR, \fBBN_CTX_get()\fR and \fBBN_CTX_end()\fR were added in OpenSSL 0.9.5. .SH NOTES .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://www.openssl.org/source/openssl-1.0.2zi.tar.gz. Further information about this software can be found on the open source community website at https://www.openssl.org/.