5 BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update, BN_BLINDING_convert,
6 BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLINDING_invert_ex,
7 BN_BLINDING_is_current_thread, BN_BLINDING_set_current_thread,
8 BN_BLINDING_lock, BN_BLINDING_unlock, BN_BLINDING_get_flags,
9 BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM functions.
13 #include <openssl/bn.h>
15 BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai,
17 void BN_BLINDING_free(BN_BLINDING *b);
18 int BN_BLINDING_update(BN_BLINDING *b,BN_CTX *ctx);
19 int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
20 int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
21 int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b,
23 int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
25 int BN_BLINDING_is_current_thread(BN_BLINDING *b);
26 void BN_BLINDING_set_current_thread(BN_BLINDING *b);
27 int BN_BLINDING_lock(BN_BLINDING *b);
28 int BN_BLINDING_unlock(BN_BLINDING *b);
29 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
30 void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
31 BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
32 const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
33 int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
34 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
39 BN_BLINDING_new() allocates a new B<BN_BLINDING> structure and copies
40 the B<A> and B<Ai> values into the newly created B<BN_BLINDING> object.
42 BN_BLINDING_free() frees the B<BN_BLINDING> structure.
43 If B<b> is NULL, nothing is done.
45 BN_BLINDING_update() updates the B<BN_BLINDING> parameters by squaring
46 the B<A> and B<Ai> or, after specific number of uses and if the
47 necessary parameters are set, by re-creating the blinding parameters.
49 BN_BLINDING_convert_ex() multiplies B<n> with the blinding factor B<A>.
50 If B<r> is not NULL a copy the inverse blinding factor B<Ai> will be
51 returned in B<r> (this is useful if a B<RSA> object is shared among
52 several threads). BN_BLINDING_invert_ex() multiplies B<n> with the
53 inverse blinding factor B<Ai>. If B<r> is not NULL it will be used as
56 BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper
57 functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex()
58 with B<r> set to NULL.
60 BN_BLINDING_is_current_thread() returns whether the B<BN_BLINDING>
61 structure is owned by the current thread. This is to help users
62 provide proper locking if needed for multi-threaded use.
64 BN_BLINDING_set_current_thread() sets the current thread as the
65 owner of the B<BN_BLINDING> structure.
67 BN_BLINDING_lock() locks the B<BN_BLINDING> structure.
69 BN_BLINDING_unlock() unlocks the B<BN_BLINDING> structure.
71 BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently
72 there are two supported flags: B<BN_BLINDING_NO_UPDATE> and
73 B<BN_BLINDING_NO_RECREATE>. B<BN_BLINDING_NO_UPDATE> inhibits the
74 automatic update of the B<BN_BLINDING> parameters after each use
75 and B<BN_BLINDING_NO_RECREATE> inhibits the automatic re-creation
76 of the B<BN_BLINDING> parameters after a fixed number of uses (currently
77 32). In newly allocated B<BN_BLINDING> objects no flags are set.
78 BN_BLINDING_set_flags() sets the B<BN_BLINDING> parameters flags.
80 BN_BLINDING_create_param() creates new B<BN_BLINDING> parameters
81 using the exponent B<e> and the modulus B<m>. B<bn_mod_exp> and
82 B<m_ctx> can be used to pass special functions for exponentiation
83 (normally BN_mod_exp_mont() and B<BN_MONT_CTX>).
87 BN_BLINDING_new() returns the newly allocated B<BN_BLINDING> structure
88 or NULL in case of an error.
90 BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
91 BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on
92 success and 0 if an error occurred.
94 BN_BLINDING_is_current_thread() returns 1 if the current thread owns
95 the B<BN_BLINDING> object, 0 otherwise.
97 BN_BLINDING_set_current_thread() doesn't return anything.
99 BN_BLINDING_lock(), BN_BLINDING_unlock() return 1 if the operation
100 succeeded or 0 on error.
102 BN_BLINDING_get_flags() returns the currently set B<BN_BLINDING> flags
103 (a B<unsigned long> value).
105 BN_BLINDING_create_param() returns the newly created B<BN_BLINDING>
106 parameters or NULL on error.
114 BN_BLINDING_thread_id() was first introduced in OpenSSL 1.0.0, and it
115 deprecates BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id().