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Title "BN_CTX_START 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables 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 Header "DESCRIPTION" These functions are used to obtain temporary \s-1BIGNUM\s0 variables from a \s-1BN_CTX\s0 (which can been created by using BN_CTX_new\|(3)) in order to save the overhead of repeatedly creating and freeing \s-1BIGNUM\s0s in functions that are called from inside a loop.

A function must call BN_CTX_start() first. Then, BN_CTX_get() may be called repeatedly to obtain temporary \s-1BIGNUM\s0s. All BN_CTX_get() calls must be made before calling any other functions that use the \fBctx as an argument.

Finally, BN_CTX_end() must be called before returning from the function. If ctx is \s-1NULL,\s0 nothing is done. When BN_CTX_end() is called, the \s-1BIGNUM\s0 pointers obtained from \fBBN_CTX_get() become invalid.

Header "RETURN VALUES" \fBBN_CTX_start() and BN_CTX_end() return no values.

\fBBN_CTX_get() returns a pointer to the \s-1BIGNUM\s0, or \s-1NULL\s0 on error. Once BN_CTX_get() has failed, the subsequent calls will return \s-1NULL\s0 as well, so it is sufficient to check the return value of the last \fBBN_CTX_get() call. In case of an error, an error code is set, which can be obtained by ERR_get_error\|(3).

Header "SEE ALSO" \fBBN_CTX_new\|(3) Header "COPYRIGHT" Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.