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_get_thread_id, BN_BLINDING_set_thread_id, BN_BLINDING_get_flags,
8 BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM
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 #ifndef OPENSSL_NO_DEPRECATED
26 unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
27 void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
29 CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *);
30 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
31 void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
32 BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
33 const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
34 int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
35 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
40 BN_BLINDING_new() allocates a new B<BN_BLINDING> structure and copies
41 the B<A> and B<Ai> values into the newly created B<BN_BLINDING> object.
43 BN_BLINDING_free() frees the B<BN_BLINDING> structure.
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 amoung
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_thread_id() provides access to the B<CRYPTO_THREADID>
61 object within the B<BN_BLINDING> structure. This is to help users
62 provide proper locking if needed for multi-threaded use. The "thread
63 id" object of a newly allocated B<BN_BLINDING> structure is
64 initialised to the thread id in which BN_BLINDING_new() was called.
66 BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently
67 there are two supported flags: B<BN_BLINDING_NO_UPDATE> and
68 B<BN_BLINDING_NO_RECREATE>. B<BN_BLINDING_NO_UPDATE> inhibits the
69 automatic update of the B<BN_BLINDING> parameters after each use
70 and B<BN_BLINDING_NO_RECREATE> inhibits the automatic re-creation
71 of the B<BN_BLINDING> parameters after a fixed number of uses (currently
72 32). In newly allocated B<BN_BLINDING> objects no flags are set.
73 BN_BLINDING_set_flags() sets the B<BN_BLINDING> parameters flags.
75 BN_BLINDING_create_param() creates new B<BN_BLINDING> parameters
76 using the exponent B<e> and the modulus B<m>. B<bn_mod_exp> and
77 B<m_ctx> can be used to pass special functions for exponentiation
78 (normally BN_mod_exp_mont() and B<BN_MONT_CTX>).
82 BN_BLINDING_new() returns the newly allocated B<BN_BLINDING> structure
83 or NULL in case of an error.
85 BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
86 BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on
87 success and 0 if an error occured.
89 BN_BLINDING_thread_id() returns a pointer to the thread id object
90 within a B<BN_BLINDING> object.
92 BN_BLINDING_get_flags() returns the currently set B<BN_BLINDING> flags
93 (a B<unsigned long> value).
95 BN_BLINDING_create_param() returns the newly created B<BN_BLINDING>
96 parameters or NULL on error.
104 BN_BLINDING_thread_id was first introduced in OpenSSL 1.0.0, and it
105 deprecates BN_BLINDING_set_thread_id and BN_BLINDING_get_thread_id.
107 BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex, BN_BLINDING_get_thread_id,
108 BN_BLINDING_set_thread_id, BN_BLINDING_set_flags, BN_BLINDING_get_flags
109 and BN_BLINDING_create_param were first introduced in OpenSSL 0.9.8
113 Nils Larsch for the OpenSSL project (http://www.openssl.org).