1=pod 2 3=head1 NAME 4 5BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update, BN_BLINDING_convert, 6BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLINDING_invert_ex, 7BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id, BN_BLINDING_get_flags, 8BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM 9functions. 10 11=head1 SYNOPSIS 12 13 #include <openssl/bn.h> 14 15 BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, 16 BIGNUM *mod); 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, 22 BN_CTX *ctx); 23 int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, 24 BN_CTX *ctx); 25 unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *); 26 void BN_BLINDING_set_thread_id(BN_BLINDING *, unsigned long); 27 unsigned long BN_BLINDING_get_flags(const BN_BLINDING *); 28 void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long); 29 BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b, 30 const BIGNUM *e, BIGNUM *m, BN_CTX *ctx, 31 int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, 32 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), 33 BN_MONT_CTX *m_ctx); 34 35=head1 DESCRIPTION 36 37BN_BLINDING_new() allocates a new B<BN_BLINDING> structure and copies 38the B<A> and B<Ai> values into the newly created B<BN_BLINDING> object. 39 40BN_BLINDING_free() frees the B<BN_BLINDING> structure. 41 42BN_BLINDING_update() updates the B<BN_BLINDING> parameters by squaring 43the B<A> and B<Ai> or, after specific number of uses and if the 44necessary parameters are set, by re-creating the blinding parameters. 45 46BN_BLINDING_convert_ex() multiplies B<n> with the blinding factor B<A>. 47If B<r> is not NULL a copy the inverse blinding factor B<Ai> will be 48returned in B<r> (this is useful if a B<RSA> object is shared amoung 49several threads). BN_BLINDING_invert_ex() multiplies B<n> with the 50inverse blinding factor B<Ai>. If B<r> is not NULL it will be used as 51the inverse blinding. 52 53BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper 54functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() 55with B<r> set to NULL. 56 57BN_BLINDING_set_thread_id() and BN_BLINDING_get_thread_id() 58set and get the "thread id" value of the B<BN_BLINDING> structure, 59a field provided to users of B<BN_BLINDING> structure to help them 60provide proper locking if needed for multi-threaded use. The 61"thread id" of a newly allocated B<BN_BLINDING> structure is zero. 62 63BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently 64there are two supported flags: B<BN_BLINDING_NO_UPDATE> and 65B<BN_BLINDING_NO_RECREATE>. B<BN_BLINDING_NO_UPDATE> inhibits the 66automatic update of the B<BN_BLINDING> parameters after each use 67and B<BN_BLINDING_NO_RECREATE> inhibits the automatic re-creation 68of the B<BN_BLINDING> parameters after a fixed number of uses (currently 6932). In newly allocated B<BN_BLINDING> objects no flags are set. 70BN_BLINDING_set_flags() sets the B<BN_BLINDING> parameters flags. 71 72BN_BLINDING_create_param() creates new B<BN_BLINDING> parameters 73using the exponent B<e> and the modulus B<m>. B<bn_mod_exp> and 74B<m_ctx> can be used to pass special functions for exponentiation 75(normally BN_mod_exp_mont() and B<BN_MONT_CTX>). 76 77=head1 RETURN VALUES 78 79BN_BLINDING_new() returns the newly allocated B<BN_BLINDING> structure 80or NULL in case of an error. 81 82BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(), 83BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on 84success and 0 if an error occured. 85 86BN_BLINDING_get_thread_id() returns the thread id (a B<unsigned long> 87value) or 0 if not set. 88 89BN_BLINDING_get_flags() returns the currently set B<BN_BLINDING> flags 90(a B<unsigned long> value). 91 92BN_BLINDING_create_param() returns the newly created B<BN_BLINDING> 93parameters or NULL on error. 94 95=head1 SEE ALSO 96 97L<bn(3)|bn(3)> 98 99=head1 HISTORY 100 101BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex, BN_BLINDING_get_thread_id, 102BN_BLINDING_set_thread_id, BN_BLINDING_set_flags, BN_BLINDING_get_flags 103and BN_BLINDING_create_param were first introduced in OpenSSL 0.9.8 104 105=head1 AUTHOR 106 107Nils Larsch for the OpenSSL project (http://www.openssl.org). 108 109=cut 110