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1.\" $OpenBSD: BN_BLINDING_new.3,v 1.11 2019/06/06 01:06:58 schwarze Exp $
2.\" OpenSSL a528d4f0 Oct 27 13:40:11 2015 -0400
3.\"
4.\" This file was written by Nils Larsch <nils@openssl.org>.
5.\" Copyright (c) 2005, 2008, 2013, 2015 The OpenSSL Project.
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52.Dd $Mdocdate: June 6 2019 $
53.Dt BN_BLINDING_NEW 3
54.Os
55.Sh NAME
56.Nm BN_BLINDING_new ,
57.Nm BN_BLINDING_free ,
58.Nm BN_BLINDING_update ,
59.Nm BN_BLINDING_convert ,
60.Nm BN_BLINDING_invert ,
61.Nm BN_BLINDING_convert_ex ,
62.Nm BN_BLINDING_invert_ex ,
63.Nm BN_BLINDING_get_thread_id ,
64.Nm BN_BLINDING_set_thread_id ,
65.Nm BN_BLINDING_thread_id ,
66.Nm BN_BLINDING_get_flags ,
67.Nm BN_BLINDING_set_flags ,
68.Nm BN_BLINDING_create_param
69.Nd blinding related BIGNUM functions
70.Sh SYNOPSIS
71.In openssl/bn.h
72.Ft BN_BLINDING *
73.Fo BN_BLINDING_new
74.Fa "const BIGNUM *A"
75.Fa "const BIGNUM *Ai"
76.Fa "BIGNUM *mod"
77.Fc
78.Ft void
79.Fo BN_BLINDING_free
80.Fa "BN_BLINDING *b"
81.Fc
82.Ft int
83.Fo BN_BLINDING_update
84.Fa "BN_BLINDING *b"
85.Fa "BN_CTX *ctx"
86.Fc
87.Ft int
88.Fo BN_BLINDING_convert
89.Fa "BIGNUM *n"
90.Fa "BN_BLINDING *b"
91.Fa "BN_CTX *ctx"
92.Fc
93.Ft int
94.Fo BN_BLINDING_invert
95.Fa "BIGNUM *n"
96.Fa "BN_BLINDING *b"
97.Fa "BN_CTX *ctx"
98.Fc
99.Ft int
100.Fo BN_BLINDING_convert_ex
101.Fa "BIGNUM *n"
102.Fa "BIGNUM *r"
103.Fa "BN_BLINDING *b"
104.Fa "BN_CTX *ctx"
105.Fc
106.Ft int
107.Fo BN_BLINDING_invert_ex
108.Fa "BIGNUM *n"
109.Fa "const BIGNUM *r"
110.Fa "BN_BLINDING *b"
111.Fa "BN_CTX *ctx"
112.Fc
113.Fd #ifndef OPENSSL_NO_DEPRECATED
114.Ft unsigned long
115.Fo BN_BLINDING_get_thread_id
116.Fa "const BN_BLINDING *"
117.Fc
118.Ft void
119.Fo BN_BLINDING_set_thread_id
120.Fa "BN_BLINDING *"
121.Fa "unsigned long"
122.Fc
123.Fd #endif
124.Ft CRYPTO_THREADID *
125.Fo BN_BLINDING_thread_id
126.Fa "BN_BLINDING *"
127.Fc
128.Ft unsigned long
129.Fo BN_BLINDING_get_flags
130.Fa "const BN_BLINDING *"
131.Fc
132.Ft void
133.Fo BN_BLINDING_set_flags
134.Fa "BN_BLINDING *"
135.Fa "unsigned long"
136.Fc
137.Ft BN_BLINDING *
138.Fo BN_BLINDING_create_param
139.Fa "BN_BLINDING *b"
140.Fa "const BIGNUM *e"
141.Fa "BIGNUM *m"
142.Fa "BN_CTX *ctx"
143.Fa "int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,\
144 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)"
145.Fa "BN_MONT_CTX *m_ctx"
146.Fc
147.Sh DESCRIPTION
148.Fn BN_BLINDING_new
149allocates a new
150.Vt BN_BLINDING
151structure and copies the
152.Fa A
153and
154.Fa \&Ai
155values into the newly created
156.Vt BN_BLINDING
157object.
158.Pp
159.Fn BN_BLINDING_free
160frees the
161.Vt BN_BLINDING
162structure.
163If
164.Fa b
165is a
166.Dv NULL
167pointer, no action occurs.
168.Pp
169.Fn BN_BLINDING_update
170updates the
171.Vt BN_BLINDING
172parameters by squaring the
173.Fa A
174and
175.Fa \&Ai
176or, after a specific number of uses and if the necessary parameters are
177set, by re-creating the blinding parameters.
178.Pp
179.Fn BN_BLINDING_convert_ex
180multiplies
181.Fa n
182with the blinding factor
183.Fa A .
184If
185.Fa r
186is not
187.Dv NULL ,
188a copy of the inverse blinding factor
189.Fa \&Ai
190will be returned in
191.Fa r
192(this is useful if an
193.Vt RSA
194object is shared among several threads).
195.Fn BN_BLINDING_invert_ex
196multiplies
197.Fa n
198with the inverse blinding factor
199.Fa \&Ai .
200If
201.Fa r
202is not
203.Dv NULL ,
204it will be used as the inverse blinding.
205.Pp
206.Fn BN_BLINDING_convert
207and
208.Fn BN_BLINDING_invert
209are wrapper functions for
210.Fn BN_BLINDING_convert_ex
211and
212.Fn BN_BLINDING_invert_ex
213with
214.Fa r
215set to
216.Dv NULL .
217.Pp
218.Fn BN_BLINDING_thread_id
219provides access to the
220.Vt CRYPTO_THREADID
221object within the
222.Vt BN_BLINDING
223structure.
224This is to help users provide proper locking if needed for
225multi-threaded use.
226The thread ID object of a newly allocated
227.Vt BN_BLINDING
228structure is initialised to the thread ID in which
229.Fn BN_BLINDING_new
230was called.
231.Pp
232.Fn BN_BLINDING_get_flags
233returns the
234.Dv BN_BLINDING_*
235flags.
236Currently there are two supported flags:
237.Dv BN_BLINDING_NO_UPDATE
238and
239.Dv BN_BLINDING_NO_RECREATE .
240.Dv BN_BLINDING_NO_UPDATE
241inhibits the automatic update of the
242.Vt BN_BLINDING
243parameters after each use and
244.Dv BN_BLINDING_NO_RECREATE
245inhibits the automatic re-creation of the
246.Vt BN_BLINDING
247parameters after a fixed number of uses (currently 32).
248In newly allocated
249.Vt BN_BLINDING
250objects no flags are set.
251.Fn BN_BLINDING_set_flags
252sets the
253.Dv BN_BLINDING_*
254parameters flags.
255.Pp
256.Fn BN_BLINDING_create_param
257creates new
258.Vt BN_BLINDING
259parameters using the exponent
260.Fa e
261and the modulus
262.Fa m .
263.Fa bn_mod_exp
264and
265.Fa m_ctx
266can be used to pass special functions for exponentiation (normally
267.Xr BN_mod_exp 3
268and
269.Vt BN_MONT_CTX ) .
270.Sh RETURN VALUES
271.Fn BN_BLINDING_new
272returns the newly allocated
273.Vt BN_BLINDING
274structure or
275.Dv NULL
276in case of an error.
277.Pp
278.Fn BN_BLINDING_update ,
279.Fn BN_BLINDING_convert ,
280.Fn BN_BLINDING_invert ,
281.Fn BN_BLINDING_convert_ex
282and
283.Fn BN_BLINDING_invert_ex
284return 1 on success and 0 if an error occurred.
285.Pp
286.Fn BN_BLINDING_thread_id
287returns a pointer to the thread ID object within a
288.Vt BN_BLINDING
289object.
290.Pp
291.Fn BN_BLINDING_get_flags
292returns the currently set
293.Dv BN_BLINDING_*
294flags (an
295.Vt unsigned long
296value).
297.Pp
298.Fn BN_BLINDING_create_param
299returns the newly created
300.Vt BN_BLINDING
301parameters or
302.Dv NULL
303on error.
304.Sh SEE ALSO
305.Xr BN_new 3 ,
306.Xr RSA_blinding_on 3
307.Sh HISTORY
308.Fn BN_BLINDING_new ,
309.Fn BN_BLINDING_free ,
310.Fn BN_BLINDING_update ,
311.Fn BN_BLINDING_convert ,
312and
313.Fn BN_BLINDING_invert
314first appeared in SSLeay 0.9.0 and have been available since
315.Ox 2.4 .
316.Pp
317.Fn BN_BLINDING_convert_ex ,
318.Fn BN_BLINDIND_invert_ex ,
319.Fn BN_BLINDING_get_thread_id ,
320.Fn BN_BLINDING_set_thread_id ,
321.Fn BN_BLINDING_get_flags ,
322.Fn BN_BLINDING_set_flags ,
323and
324.Fn BN_BLINDING_create_param
325first appeared in OpenSSL 0.9.8 and have been available since
326.Ox 4.5 .
327.Pp
328.Fn BN_BLINDING_thread_id
329first appeared in OpenSSL 1.0.0 and has been available since
330.Ox 4.9 .
331.Sh AUTHORS
332.An Nils Larsch Aq Mt nils@openssl.org
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