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class method
OpenSSL::BN.generate_prime
(::Integer bits, ?::boolish safe, ?::OpenSSL::bn add, ?::OpenSSL::bn rem) -> instance
BN.generate_prime(bits, [, safe [, add [, rem]]]) => bn
ext/openssl/ossl_bn.c
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static VALUE
ossl_bn_s_generate_prime(int argc, VALUE *argv, VALUE klass)
{
BIGNUM *add = NULL, *rem = NULL, *result;
int safe = 1, num;
VALUE vnum, vsafe, vadd, vrem, obj;
rb_scan_args(argc, argv, "13", &vnum, &vsafe, &vadd, &vrem);
num = NUM2INT(vnum);
if (vsafe == Qfalse) {
safe = 0;
}
if (!NIL_P(vadd)) {
add = GetBNPtr(vadd);
rem = NIL_P(vrem) ? NULL : GetBNPtr(vrem);
}
obj = NewBN(klass);
if (!(result = BN_new())) {
ossl_raise(eBNError, NULL);
}
if (!BN_generate_prime_ex(result, num, safe, add, rem, NULL)) {
BN_free(result);
ossl_raise(eBNError, NULL);
}
SetBN(obj, result);
return obj;
}
Generates a random prime number of bit length bits. If safe is set to true, generates a safe prime. If add is specified, generates a prime that fulfills condition p % add = rem.