1BN_BLINDING_new(3) OpenSSL BN_BLINDING_new(3)
2
6 BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update,
7 BN_BLINDING_convert, BN_BLINDING_invert, BN_BLINDING_convert_ex,
8 BN_BLINDING_invert_ex, BN_BLINDING_get_thread_id,
9 BN_BLINDING_set_thread_id, BN_BLINDING_get_flags,
10 BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related
11 BIGNUM functions.
12
14 #include <openssl/bn.h>
15 BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai,
17 BIGNUM *mod);
18 void BN_BLINDING_free(BN_BLINDING *b);
19 int BN_BLINDING_update(BN_BLINDING *b,BN_CTX *ctx);
20 int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
21 int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx);
22 int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b,
23 BN_CTX *ctx);
24 int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b,
25 BN_CTX *ctx);
26 #ifndef OPENSSL_NO_DEPRECATED
27 unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *);
28 void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long);
29 #endif
30 CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *);
31 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *);
32 void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long);
33 BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
34 const BIGNUM *e, BIGNUM *m, BN_CTX *ctx,
35 int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
36 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
37 BN_MONT_CTX *m_ctx);
38
40 BN_BLINDING_new() allocates a new BN_BLINDING structure and copies the
41 A and Ai values into the newly created BN_BLINDING object.
42 BN_BLINDING_free() frees the BN_BLINDING structure.
44 BN_BLINDING_update() updates the BN_BLINDING parameters by squaring the
46 A and Ai or, after specific number of uses and if the necessary
47 parameters are set, by re-creating the blinding parameters.
48 BN_BLINDING_convert_ex() multiplies n with the blinding factor A. If r
50 is not NULL a copy the inverse blinding factor Ai will be returned in r
51 (this is useful if a RSA object is shared amoung several threads).
52 BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor
53 Ai. If r is not NULL it will be used as the inverse blinding.
54 BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper functions
56 for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() with r set to
57 NULL.
58 BN_BLINDING_thread_id() provides access to the CRYPTO_THREADID object
60 within the BN_BLINDING structure. This is to help users provide proper
61 locking if needed for multi-threaded use. The "thread id" object of a
62 newly allocated BN_BLINDING structure is initialised to the thread id
63 in which BN_BLINDING_new() was called.
64 BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently there
66 are two supported flags: BN_BLINDING_NO_UPDATE and
67 BN_BLINDING_NO_RECREATE. BN_BLINDING_NO_UPDATE inhibits the automatic
68 update of the BN_BLINDING parameters after each use and
69 BN_BLINDING_NO_RECREATE inhibits the automatic re-creation of the
70 BN_BLINDING parameters after a fixed number of uses (currently 32). In
71 newly allocated BN_BLINDING objects no flags are set.
72 BN_BLINDING_set_flags() sets the BN_BLINDING parameters flags.
73 BN_BLINDING_create_param() creates new BN_BLINDING parameters using the
75 exponent e and the modulus m. bn_mod_exp and m_ctx can be used to pass
76 special functions for exponentiation (normally BN_mod_exp_mont() and
77 BN_MONT_CTX).
78
80 BN_BLINDING_new() returns the newly allocated BN_BLINDING structure or
81 NULL in case of an error.
82 BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(),
84 BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on
85 success and 0 if an error occured.
86 BN_BLINDING_thread_id() returns a pointer to the thread id object
88 within a BN_BLINDING object.
89 BN_BLINDING_get_flags() returns the currently set BN_BLINDING flags (a
91 unsigned long value).
92 BN_BLINDING_create_param() returns the newly created BN_BLINDING
94 parameters or NULL on error.
95
97 bn(3)
98
100 BN_BLINDING_thread_id was first introduced in OpenSSL 1.0.0, and it
101 deprecates BN_BLINDING_set_thread_id and BN_BLINDING_get_thread_id.
102 BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex,
104 BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id,
105 BN_BLINDING_set_flags, BN_BLINDING_get_flags and
106 BN_BLINDING_create_param were first introduced in OpenSSL 0.9.8
107
109 Nils Larsch for the OpenSSL project (http://www.openssl.org).
1101.0.0e 2009-09-30 BN_BLINDING_new(3)