private fun sha1_intern(len: Int): CString `{
		sha1nfo s;

		sha1_init(&s);
		sha1_write(&s, self, len);
		uint8_t* digest = sha1_result(&s);

		char* digested = malloc(21);

		memcpy(digested, digest, 20);

		digested[20] = '\0';

		return digested;
	`}