194 lines
5.5 KiB
Groff
194 lines
5.5 KiB
Groff
.\" $NetBSD: BN_CTX_new.3,v 1.12 2003/07/24 14:16:37 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "BN_CTX_new 3"
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.TH BN_CTX_new 3 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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.SH "NAME"
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BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free \s-1BN_CTX\s0 structures
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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.Ve
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.Vb 1
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\& BN_CTX *BN_CTX_new(void);
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.Ve
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.Vb 1
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\& void BN_CTX_init(BN_CTX *c);
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.Ve
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.Vb 1
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\& void BN_CTX_free(BN_CTX *c);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
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library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
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is rather expensive when used in conjunction with repeated subroutine
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calls, the \fB\s-1BN_CTX\s0\fR structure is used.
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.PP
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\&\fIBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR
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structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
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\&\fB\s-1BN_CTX\s0\fR.
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.PP
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\&\fIBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was
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created by \fIBN_CTX_new()\fR, also the structure itself.
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If BN_CTX_start(3) has been used on the \fB\s-1BN_CTX\s0\fR,
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BN_CTX_end(3) must be called before the \fB\s-1BN_CTX\s0\fR
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may be freed by \fIBN_CTX_free()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails,
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it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
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ERR_get_error(3).
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.PP
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\&\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_bn(3), ERR_get_error(3), BN_add(3),
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BN_CTX_start(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
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and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.
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