187 lines
5.7 KiB
Groff
Executable File
187 lines
5.7 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "BN_NEW 3"
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.TH BN_NEW 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs
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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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\&
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\& BIGNUM *BN_new(void);
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\&
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\& BIGNUM *BN_secure_new(void);
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\&
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\& void BN_clear(BIGNUM *a);
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\&
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\& void BN_free(BIGNUM *a);
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\&
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\& void BN_clear_free(BIGNUM *a);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure.
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\&\fIBN_secure_new()\fR does the same except that the secure heap
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\&\fIOPENSSL_secure_malloc\fR\|(3) is used to store the value.
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.PP
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\&\fIBN_clear()\fR is used to destroy sensitive data such as keys when they
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are no longer needed. It erases the memory used by \fBa\fR and sets it
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to the value 0.
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If \fBa\fR is \s-1NULL\s0, nothing is done.
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.PP
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\&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
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by \fIBN_new()\fR, also the structure itself. \fIBN_clear_free()\fR additionally
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overwrites the data before the memory is returned to the system.
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If \fBa\fR is \s-1NULL\s0, nothing is done.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_new()\fR and \fIBN_secure_new()\fR
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return a pointer to the \fB\s-1BIGNUM\s0\fR initialised to the value 0.
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If the allocation fails,
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they return \fB\s-1NULL\s0\fR and set an error code that can be obtained
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by \fIERR_get_error\fR\|(3).
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.PP
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\&\fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_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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\&\fIERR_get_error\fR\|(3), \fIOPENSSL_secure_malloc\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_init()\fR was removed in OpenSSL 1.1.0; use \fIBN_new()\fR instead.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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