Merge branch 'vendor/OPENSSL'
[dragonfly.git] / secure / lib / libcrypto / man / BN_new.3
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129.\" ========================================================================
130.\"
131.IX Title "BN_new 3"
18ed9402 132.TH BN_new 3 "2008-09-27" "0.9.8i" "OpenSSL"
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133.SH "NAME"
134BN_new, BN_init, BN_clear, BN_free, BN_clear_free \- allocate and free BIGNUMs
135.SH "SYNOPSIS"
8b0cefbb 136.IX Header "SYNOPSIS"
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137.Vb 1
138\& #include <openssl/bn.h>
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139.Ve
140.PP
141.Vb 1
984263bc 142\& BIGNUM *BN_new(void);
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143.Ve
144.PP
145.Vb 1
984263bc 146\& void BN_init(BIGNUM *);
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147.Ve
148.PP
149.Vb 1
984263bc 150\& void BN_clear(BIGNUM *a);
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151.Ve
152.PP
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984263bc 154\& void BN_free(BIGNUM *a);
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155.Ve
156.PP
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158\& void BN_clear_free(BIGNUM *a);
159.Ve
160.SH "DESCRIPTION"
8b0cefbb 161.IX Header "DESCRIPTION"
a561f9ff 162\&\fIBN_new()\fR allocates and initializes a \fB\s-1BIGNUM\s0\fR structure. \fIBN_init()\fR
8b0cefbb 163initializes an existing uninitialized \fB\s-1BIGNUM\s0\fR.
984263bc 164.PP
8b0cefbb 165\&\fIBN_clear()\fR is used to destroy sensitive data such as keys when they
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166are no longer needed. It erases the memory used by \fBa\fR and sets it
167to the value 0.
168.PP
8b0cefbb 169\&\fIBN_free()\fR frees the components of the \fB\s-1BIGNUM\s0\fR, and if it was created
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170by \fIBN_new()\fR, also the structure itself. \fIBN_clear_free()\fR additionally
171overwrites the data before the memory is returned to the system.
172.SH "RETURN VALUES"
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173.IX Header "RETURN VALUES"
174\&\fIBN_new()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR. If the allocation fails,
175it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained
176by \fIERR_get_error\fR\|(3).
984263bc 177.PP
8b0cefbb 178\&\fIBN_init()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR have no return
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179values.
180.SH "SEE ALSO"
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181.IX Header "SEE ALSO"
182\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3)
984263bc 183.SH "HISTORY"
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184.IX Header "HISTORY"
185\&\fIBN_new()\fR, \fIBN_clear()\fR, \fIBN_free()\fR and \fIBN_clear_free()\fR are available in
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186all versions on SSLeay and OpenSSL. \fIBN_init()\fR was added in SSLeay
1870.9.1b.