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1.\" $OpenBSD: BN_set_bit.3,v 1.8 2021/11/30 18:34:35 tb Exp $
2.\" OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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51.Dd $Mdocdate: November 30 2021 $
52.Dt BN_SET_BIT 3
53.Os
54.Sh NAME
55.Nm BN_set_bit ,
56.Nm BN_clear_bit ,
57.Nm BN_is_bit_set ,
58.Nm BN_mask_bits ,
59.Nm BN_lshift ,
60.Nm BN_lshift1 ,
61.Nm BN_rshift ,
62.Nm BN_rshift1
63.Nd bit operations on BIGNUMs
64.Sh SYNOPSIS
65.In openssl/bn.h
66.Ft int
67.Fo BN_set_bit
68.Fa "BIGNUM *a"
69.Fa "int n"
70.Fc
71.Ft int
72.Fo BN_clear_bit
73.Fa "BIGNUM *a"
74.Fa "int n"
75.Fc
76.Ft int
77.Fo BN_is_bit_set
78.Fa "const BIGNUM *a"
79.Fa "int n"
80.Fc
81.Ft int
82.Fo BN_mask_bits
83.Fa "BIGNUM *a"
84.Fa "int n"
85.Fc
86.Ft int
87.Fo BN_lshift
88.Fa "BIGNUM *r"
89.Fa "const BIGNUM *a"
90.Fa "int n"
91.Fc
92.Ft int
93.Fo BN_lshift1
94.Fa "BIGNUM *r"
95.Fa "const BIGNUM *a"
96.Fc
97.Ft int
98.Fo BN_rshift
99.Fa "BIGNUM *r"
100.Fa "const BIGNUM *a"
101.Fa "int n"
102.Fc
103.Ft int
104.Fo BN_rshift1
105.Fa "BIGNUM *r"
106.Fa "const BIGNUM *a"
107.Fc
108.Sh DESCRIPTION
109.Fn BN_set_bit
110sets bit
111.Fa n
112in
113.Fa a
114to 1
115.Pq Li a|=(1<<n) .
116The number is expanded if necessary.
117.Pp
118.Fn BN_clear_bit
119sets bit
120.Fa n
121in
122.Fa a
123to 0
124.Pq Li a&=~(1<<n) .
125An error occurs if
126.Fa a
127is shorter than
128.Fa n
129bits.
130.Pp
131.Fn BN_is_bit_set
132tests if bit
133.Fa n
134in
135.Fa a
136is set.
137.Pp
138.Fn BN_mask_bits
139truncates
140.Fa a
141to an
142.Fa n
143bit number
144.Pq Li a&=~((~0)>>n) .
145An error occurs if
146.Fa a
147already is shorter than
148.Fa n
149bits.
150.Pp
151.Fn BN_lshift
152shifts
153.Fa a
154left by
155.Fa n
156bits and places the result in
157.Fa r
158.Pq Li r=a*2^n .
159Note that
160.Fa n
161must be non-negative.
162.Fn BN_lshift1
163shifts
164.Fa a
165left by one and places the result in
166.Fa r
167.Pq Li r=2*a .
168.Pp
169.Fn BN_rshift
170shifts
171.Fa a
172right by
173.Fa n
174bits and places the result in
175.Fa r
176.Pq Li r=a/2^n .
177Note that
178.Fa n
179must be non-negative.
180.Fn BN_rshift1
181shifts
182.Fa a
183right by one and places the result in
184.Fa r
185.Pq Li r=a/2 .
186.Pp
187For the shift functions,
188.Fa r
189and
190.Fa a
191may be the same variable.
192.Sh RETURN VALUES
193.Fn BN_is_bit_set
194returns 1 if the bit is set, 0 otherwise.
195.Pp
196All other functions return 1 for success, 0 on error.
197The error codes can be obtained by
198.Xr ERR_get_error 3 .
199.Sh SEE ALSO
200.Xr BN_add 3 ,
201.Xr BN_new 3 ,
202.Xr BN_num_bytes 3 ,
203.Xr BN_set_negative 3 ,
204.Xr BN_zero 3
205.Sh HISTORY
206.Fn BN_set_bit ,
207.Fn BN_clear_bit ,
208.Fn BN_is_bit_set ,
209.Fn BN_mask_bits ,
210.Fn BN_lshift ,
211.Fn BN_lshift1 ,
212.Fn BN_rshift ,
213and
214.Fn BN_rshift1
215first appeared in SSLeay 0.5.1 and have been available since
216.Ox 2.4 .
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-12-23 15:15:20 +0000