BN_BLINDING_new(3) - NetBSD Manual Pages

BN_BLINDING_new(3)                  OpenSSL                 BN_BLINDING_new(3)




NAME
BN_BLINDING_new, BN_BLINDING_free, BN_BLINDING_update, BN_BLINDING_con- vert, BN_BLINDING_invert, BN_BLINDING_convert_ex, BN_BLIND- ING_invert_ex, BN_BLINDING_set_thread, BN_BLINDING_cmp_thread, BN_BLINDING_get_flags, BN_BLINDING_set_flags, BN_BLINDING_create_param - blinding related BIGNUM functions.
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/bn.h> BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, BIGNUM *mod); void BN_BLINDING_free(BN_BLINDING *b); int BN_BLINDING_update(BN_BLINDING *b,BN_CTX *ctx); int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx); int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx); int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx); int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx); void BN_BLINDING_set_thread(BN_BLINDING *); int BN_BLINDING_cmp_thread(const BN_BLINDING *, const CRYPTO_THREADID *); unsigned long BN_BLINDING_get_flags(const BN_BLINDING *); void BN_BLINDING_set_flags(BN_BLINDING *, unsigned long); BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b, const BIGNUM *e, BIGNUM *m, BN_CTX *ctx, int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx), BN_MONT_CTX *m_ctx);
DESCRIPTION
BN_BLINDING_new() allocates a new BN_BLINDING structure and copies the A and Ai values into the newly created BN_BLINDING object. BN_BLINDING_free() frees the BN_BLINDING structure. BN_BLINDING_update() updates the BN_BLINDING parameters by squaring the A and Ai or, after specific number of uses and if the necessary parame- ters are set, by re-creating the blinding parameters. BN_BLINDING_convert_ex() multiplies n with the blinding factor A. If r is not NULL a copy the inverse blinding factor Ai will be returned in r (this is useful if a RSA object is shared amoung several threads). BN_BLINDING_invert_ex() multiplies n with the inverse blinding factor Ai. If r is not NULL it will be used as the inverse blinding. BN_BLINDING_convert() and BN_BLINDING_invert() are wrapper functions for BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() with r set to NULL. BN_BLINDING_set_thread() and BN_BLINDING_cmp_thread() set and compare the "thread id" of the BN_BLINDING structure, allowing users of the BN_BLINDING structure to provide proper locking if needed for multi- threaded use. BN_BLINDING_get_flags() returns the BN_BLINDING flags. Currently there are two supported flags: BN_BLINDING_NO_UPDATE and BN_BLIND- ING_NO_RECREATE. BN_BLINDING_NO_UPDATE inhibits the automatic update of the BN_BLINDING parameters after each use and BN_BLINDING_NO_RECREATE inhibits the automatic re-creation of the BN_BLINDING parameters after a fixed number of uses (currently 32). In newly allocated BN_BLINDING objects no flags are set. BN_BLINDING_set_flags() sets the BN_BLINDING parameters flags. BN_BLINDING_create_param() creates new BN_BLINDING parameters using the exponent e and the modulus m. bn_mod_exp and m_ctx can be used to pass special functions for exponentiation (normally BN_mod_exp_mont() and BN_MONT_CTX).
RETURN VALUES
BN_BLINDING_new() returns the newly allocated BN_BLINDING structure or NULL in case of an error. BN_BLINDING_update(), BN_BLINDING_convert(), BN_BLINDING_invert(), BN_BLINDING_convert_ex() and BN_BLINDING_invert_ex() return 1 on suc- cess and 0 if an error occured. BN_BLINDING_get_thread_id() returns the thread id (a unsigned long value) or 0 if not set. BN_BLINDING_cmp_thread() returns 0 if the thread id associated with the BN_BLINDING structure equals the provided thread id (which can be obtained by CRYPTO_THREADID_set()), otherwise it returns -1 or +1 to indicate the thread ids are different (if the target architecture supports ordering of thread ids, this follows the traditional "cmp" semantics of memcmp() or strcmp()). BN_BLINDING_get_flags() returns the currently set BN_BLINDING flags (a unsigned long value). BN_BLINDING_create_param() returns the newly created BN_BLINDING param- eters or NULL on error.
SEE ALSO
openssl_bn(3)
HISTORY
BN_BLINDING_convert_ex, BN_BLINDIND_invert_ex, BN_BLIND- ING_get_thread_id, BN_BLINDING_set_thread_id, BN_BLINDING_set_flags, BN_BLINDING_get_flags and BN_BLINDING_create_param were first intro- duced in OpenSSL 0.9.8 BN_BLINDING_get_thread_idptr, BN_BLINDING_set_thread_idptr were first introduced in OpenSSL 0.9.9 BN_BLINDING_get_thread_id, BN_BLINDING_set_thread_id, BN_BLIND- ING_get_thread_idptr, BN_BLINDING_set_thread_idptr were all deprecated in favour of BN_BLINDING_set_thread, BN_BLINDING_cmp_thread which were introduced in OpenSSL 0.9.9
AUTHOR
Nils Larsch for the OpenSSL project (http://www.openssl.org). 0.9.9-dev 2008-05-09 BN_BLINDING_new(3)

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