Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / BN_zero.3
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124.\" ========================================================================
125.\"
126.IX Title "BN_zero 3"
e3261593 127.TH BN_zero 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment
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134operations
135.SH "SYNOPSIS"
8b0cefbb 136.IX Header "SYNOPSIS"
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137.Vb 1
138\& #include <openssl/bn.h>
e257b235 139\&
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140\& int BN_zero(BIGNUM *a);
141\& int BN_one(BIGNUM *a);
e257b235 142\&
984263bc 143\& const BIGNUM *BN_value_one(void);
e257b235 144\&
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145\& int BN_set_word(BIGNUM *a, unsigned long w);
146\& unsigned long BN_get_word(BIGNUM *a);
147.Ve
148.SH "DESCRIPTION"
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149.IX Header "DESCRIPTION"
150\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR set \fBa\fR to the values 0, 1 and
151\&\fBw\fR respectively. \fIBN_zero()\fR and \fIBN_one()\fR are macros.
984263bc 152.PP
8b0cefbb 153\&\fIBN_value_one()\fR returns a \fB\s-1BIGNUM\s0\fR constant of value 1. This constant
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154is useful for use in comparisons and assignment.
155.PP
8b0cefbb 156\&\fIBN_get_word()\fR returns \fBa\fR, if it can be represented as an unsigned
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157long.
158.SH "RETURN VALUES"
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159.IX Header "RETURN VALUES"
160\&\fIBN_get_word()\fR returns the value \fBa\fR, and 0xffffffffL if \fBa\fR cannot
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161be represented as an unsigned long.
162.PP
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163\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR return 1 on success, 0 otherwise.
164\&\fIBN_value_one()\fR returns the constant.
984263bc 165.SH "BUGS"
8b0cefbb 166.IX Header "BUGS"
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167Someone might change the constant.
168.PP
8b0cefbb 169If a \fB\s-1BIGNUM\s0\fR is equal to 0xffffffffL it can be represented as an
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170unsigned long but this value is also returned on error.
171.SH "SEE ALSO"
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172.IX Header "SEE ALSO"
173\&\fIbn\fR\|(3), \fIBN_bn2bin\fR\|(3)
984263bc 174.SH "HISTORY"
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175.IX Header "HISTORY"
176\&\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR are available in all versions of
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177SSLeay and OpenSSL. \fIBN_value_one()\fR and \fIBN_get_word()\fR were added in
178SSLeay 0.8.
179.PP
8b0cefbb 180\&\fIBN_value_one()\fR was changed to return a true const \s-1BIGNUM\s0 * in OpenSSL
984263bc 1810.9.7.