/*unchecked (opaque)*/ typedef struct GO_ENGINE { char data[1]; } GO_ENGINE;
const GO_EVP_AEAD* _goboringcrypto_EVP_aead_aes_128_gcm(void);
const GO_EVP_AEAD* _goboringcrypto_EVP_aead_aes_256_gcm(void);
enum {
	GO_EVP_AEAD_DEFAULT_TAG_LENGTH = 0
};
size_t _goboringcrypto_EVP_AEAD_key_length(const GO_EVP_AEAD*);
size_t _goboringcrypto_EVP_AEAD_nonce_length(const GO_EVP_AEAD*);

		} else {
			aead = C._goboringcrypto_EVP_aead_aes_128_gcm()
		}
	case 256:
		if tls {
			aead = C._goboringcrypto_EVP_aead_aes_256_gcm_tls12()
		} else {
			aead = C._goboringcrypto_EVP_aead_aes_256_gcm()
		}
	default:
		// Fall back to standard library for GCM with non-standard key size.
		return cipher.NewGCMWithNonceSize(&noGCM{c}, gcmStandardNonceSize)
	}

	g := &aesGCM{aead: aead}