Update build for OpenSSL-0.9.8j upgrade.
[dragonfly.git] / secure / lib / libcrypto / man / BN_zero.3
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132.\" ========================================================================
133.\"
134.IX Title "BN_zero 3"
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135.TH BN_zero 3 "2009-01-11" "0.9.8j" "OpenSSL"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
984263bc 140.SH "NAME"
74dab6c2 141BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment
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142operations
143.SH "SYNOPSIS"
8b0cefbb 144.IX Header "SYNOPSIS"
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145.Vb 1
146\& #include <openssl/bn.h>
e257b235 147\&
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148\& int BN_zero(BIGNUM *a);
149\& int BN_one(BIGNUM *a);
e257b235 150\&
984263bc 151\& const BIGNUM *BN_value_one(void);
e257b235 152\&
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153\& int BN_set_word(BIGNUM *a, unsigned long w);
154\& unsigned long BN_get_word(BIGNUM *a);
155.Ve
156.SH "DESCRIPTION"
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157.IX Header "DESCRIPTION"
158\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR set \fBa\fR to the values 0, 1 and
159\&\fBw\fR respectively. \fIBN_zero()\fR and \fIBN_one()\fR are macros.
984263bc 160.PP
8b0cefbb 161\&\fIBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant
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162is useful for use in comparisons and assignment.
163.PP
8b0cefbb 164\&\fIBN_get_word()\fR returns \fBa\fR, if it can be represented as an unsigned
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165long.
166.SH "RETURN VALUES"
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167.IX Header "RETURN VALUES"
168\&\fIBN_get_word()\fR returns the value \fBa\fR, and 0xffffffffL if \fBa\fR cannot
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169be represented as an unsigned long.
170.PP
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171\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR return 1 on success, 0 otherwise.
172\&\fIBN_value_one()\fR returns the constant.
984263bc 173.SH "BUGS"
8b0cefbb 174.IX Header "BUGS"
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175Someone might change the constant.
176.PP
8b0cefbb 177If a \fB\s-1BIGNUM\s0\fR is equal to 0xffffffffL it can be represented as an
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178unsigned long but this value is also returned on error.
179.SH "SEE ALSO"
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180.IX Header "SEE ALSO"
181\&\fIbn\fR\|(3), \fIBN_bn2bin\fR\|(3)
984263bc 182.SH "HISTORY"
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183.IX Header "HISTORY"
184\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR are available in all versions of
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185SSLeay and OpenSSL. \fIBN_value_one()\fR and \fIBN_get_word()\fR were added in
186SSLeay 0.8.
187.PP
8b0cefbb 188\&\fIBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL
984263bc 1890.9.7.