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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/BN_generate_prime.pod | |
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Diffstat (limited to 'openssl/doc/crypto/BN_generate_prime.pod')
-rw-r--r-- | openssl/doc/crypto/BN_generate_prime.pod | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BN_generate_prime.pod b/openssl/doc/crypto/BN_generate_prime.pod new file mode 100644 index 000000000..7dccacbc1 --- /dev/null +++ b/openssl/doc/crypto/BN_generate_prime.pod @@ -0,0 +1,102 @@ +=pod + +=head1 NAME + +BN_generate_prime, BN_is_prime, BN_is_prime_fasttest - generate primes and test for primality + +=head1 SYNOPSIS + + #include <openssl/bn.h> + + BIGNUM *BN_generate_prime(BIGNUM *ret, int num, int safe, BIGNUM *add, + BIGNUM *rem, void (*callback)(int, int, void *), void *cb_arg); + + int BN_is_prime(const BIGNUM *a, int checks, void (*callback)(int, int, + void *), BN_CTX *ctx, void *cb_arg); + + int BN_is_prime_fasttest(const BIGNUM *a, int checks, + void (*callback)(int, int, void *), BN_CTX *ctx, void *cb_arg, + int do_trial_division); + +=head1 DESCRIPTION + +BN_generate_prime() generates a pseudo-random prime number of B<num> +bits. +If B<ret> is not B<NULL>, it will be used to store the number. + +If B<callback> is not B<NULL>, it is called as follows: + +=over 4 + +=item * + +B<callback(0, i, cb_arg)> is called after generating the i-th +potential prime number. + +=item * + +While the number is being tested for primality, B<callback(1, j, +cb_arg)> is called as described below. + +=item * + +When a prime has been found, B<callback(2, i, cb_arg)> is called. + +=back + +The prime may have to fulfill additional requirements for use in +Diffie-Hellman key exchange: + +If B<add> is not B<NULL>, the prime will fulfill the condition p % B<add> +== B<rem> (p % B<add> == 1 if B<rem> == B<NULL>) in order to suit a given +generator. + +If B<safe> is true, it will be a safe prime (i.e. a prime p so +that (p-1)/2 is also prime). + +The PRNG must be seeded prior to calling BN_generate_prime(). +The prime number generation has a negligible error probability. + +BN_is_prime() and BN_is_prime_fasttest() test if the number B<a> is +prime. The following tests are performed until one of them shows that +B<a> is composite; if B<a> passes all these tests, it is considered +prime. + +BN_is_prime_fasttest(), when called with B<do_trial_division == 1>, +first attempts trial division by a number of small primes; +if no divisors are found by this test and B<callback> is not B<NULL>, +B<callback(1, -1, cb_arg)> is called. +If B<do_trial_division == 0>, this test is skipped. + +Both BN_is_prime() and BN_is_prime_fasttest() perform a Miller-Rabin +probabilistic primality test with B<checks> iterations. If +B<checks == BN_prime_checks>, a number of iterations is used that +yields a false positive rate of at most 2^-80 for random input. + +If B<callback> is not B<NULL>, B<callback(1, j, cb_arg)> is called +after the j-th iteration (j = 0, 1, ...). B<ctx> is a +pre-allocated B<BN_CTX> (to save the overhead of allocating and +freeing the structure in a loop), or B<NULL>. + +=head1 RETURN VALUES + +BN_generate_prime() returns the prime number on success, B<NULL> otherwise. + +BN_is_prime() returns 0 if the number is composite, 1 if it is +prime with an error probability of less than 0.25^B<checks>, and +-1 on error. + +The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. + +=head1 SEE ALSO + +L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)> + +=head1 HISTORY + +The B<cb_arg> arguments to BN_generate_prime() and to BN_is_prime() +were added in SSLeay 0.9.0. The B<ret> argument to BN_generate_prime() +was added in SSLeay 0.9.1. +BN_is_prime_fasttest() was added in OpenSSL 0.9.5. + +=cut |