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* primegen.c (gen_prime): Bail out if NBITS is less than 16. (prime_generate_internal): Initialize prime variable to suppress compiler warning. Check pbits, initialize qbits when passed as zero. * primegen.c (prime_generate_internal): New arg ALL_FACTORS. Changed all callers. (gcry_prime_generate): Make the factors arg optional. Request all_factors. (gcry_prime_group_generator): New. (gcry_prime_release_factors): New. * global.c (_gcry_malloc): Handle the no_secure_memory option. * gcrypt.h (gcry_prime_group_generator): New. (gcry_prime_release_factors): New. * prime.c (check_primes): Generate a generator and avoid printing unless in verbose mode.