) return 1 on success or 0 on failure.</p>

<p>RSA_get_multi_prime_extra_count() returns two less than the number of primes in use, which is 0 for traditional RSA and the number of extra primes for multi-prime RSA.</p>

<p>RSA_get_version() returns <b>RSA_ASN1_VERSION_MULTI</b> for multi-prime RSA and <b>RSA_ASN1_VERSION_DEFAULT</b> for normal two-prime RSA, as defined in RFC 8017.</p>

<p>RSA_test_flags() returns the current state of the flags in the RSA object.</p>

<p>RSA_get0_engine() returns the ENGINE