presto-main/src/main/java/io/prestosql/operator/scalar/HmacFunctions.java/HmacFunctions/hmacMd5
class HmacFunctions:    @Description("Compute HMAC with MD5")
    @ScalarFunction
    @SqlType(StandardTypes.VARBINARY)
    public static Slice hmacMd5(@SqlType(StandardTypes.VARBINARY) Slice slice, @SqlType(StandardTypes.VARBINARY) Slice key)
    {
        return wrappedBuffer(Hashing.hmacMd5(key.getBytes()).hashBytes(slice.getBytes()).asBytes());
    }