case *sha1Hash:
		return C._goboringcrypto_EVP_sha1()
	case *sha224Hash:
		return C._goboringcrypto_EVP_sha224()
	case *sha256Hash:
		return C._goboringcrypto_EVP_sha256()
	case *sha384Hash:
		return C._goboringcrypto_EVP_sha384()
	case *sha512Hash:
		return C._goboringcrypto_EVP_sha512()
	}
	return nil
}

// cryptoHashToMD converts a crypto.Hash
// to a BoringCrypto *C.GO_EVP_MD.

const GO_EVP_MD* _goboringcrypto_EVP_md5_sha1(void);
const GO_EVP_MD* _goboringcrypto_EVP_sha1(void);
const GO_EVP_MD* _goboringcrypto_EVP_sha224(void);
const GO_EVP_MD* _goboringcrypto_EVP_sha256(void);
const GO_EVP_MD* _goboringcrypto_EVP_sha384(void);
const GO_EVP_MD* _goboringcrypto_EVP_sha512(void);
int _goboringcrypto_EVP_MD_type(const GO_EVP_MD*);
size_t _goboringcrypto_EVP_MD_size(const GO_EVP_MD*);

// #include <openssl/hmac.h>