diff --git a/wolfcrypt/src/aes.c b/wolfcrypt/src/aes.c index 29f84e474..b3595e5be 100644 --- a/wolfcrypt/src/aes.c +++ b/wolfcrypt/src/aes.c @@ -933,6 +933,7 @@ static const word32 rcon[] = { /* for 128-bit blocks, Rijndael never uses more than 10 rcon values */ }; +#ifndef WOLFSSL_AES_SMALL_TABLES static const word32 Te[4][256] = { { 0xc66363a5U, 0xf87c7c84U, 0xee777799U, 0xf67b7b8dU, @@ -1468,8 +1469,10 @@ static const word32 Td[4][256] = { 0xcb84617bU, 0x32b670d5U, 0x6c5c7448U, 0xb85742d0U, } }; +#endif /* HAVE_AES_DECRYPT */ +#endif - +#ifdef HAVE_AES_DECRYPT #if (defined(HAVE_AES_CBC) && !defined(WOLFSSL_DEVCRYPTO_CBC)) \ || defined(WOLFSSL_AES_DIRECT) static const byte Td4[256] = @@ -1512,7 +1515,62 @@ static const byte Td4[256] = #define GETBYTE(x, y) (word32)((byte)((x) >> (8 * (y)))) +#ifdef WOLFSSL_AES_SMALL_TABLES +static const byte Tsbox[256] = { + 0x63U, 0x7cU, 0x77U, 0x7bU, 0xf2U, 0x6bU, 0x6fU, 0xc5U, + 0x30U, 0x01U, 0x67U, 0x2bU, 0xfeU, 0xd7U, 0xabU, 0x76U, + 0xcaU, 0x82U, 0xc9U, 0x7dU, 0xfaU, 0x59U, 0x47U, 0xf0U, + 0xadU, 0xd4U, 0xa2U, 0xafU, 0x9cU, 0xa4U, 0x72U, 0xc0U, + 0xb7U, 0xfdU, 0x93U, 0x26U, 0x36U, 0x3fU, 0xf7U, 0xccU, + 0x34U, 0xa5U, 0xe5U, 0xf1U, 0x71U, 0xd8U, 0x31U, 0x15U, + 0x04U, 0xc7U, 0x23U, 0xc3U, 0x18U, 0x96U, 0x05U, 0x9aU, + 0x07U, 0x12U, 0x80U, 0xe2U, 0xebU, 0x27U, 0xb2U, 0x75U, + 0x09U, 0x83U, 0x2cU, 0x1aU, 0x1bU, 0x6eU, 0x5aU, 0xa0U, + 0x52U, 0x3bU, 0xd6U, 0xb3U, 0x29U, 0xe3U, 0x2fU, 0x84U, + 0x53U, 0xd1U, 0x00U, 0xedU, 0x20U, 0xfcU, 0xb1U, 0x5bU, + 0x6aU, 0xcbU, 0xbeU, 0x39U, 0x4aU, 0x4cU, 0x58U, 0xcfU, + 0xd0U, 0xefU, 0xaaU, 0xfbU, 0x43U, 0x4dU, 0x33U, 0x85U, + 0x45U, 0xf9U, 0x02U, 0x7fU, 0x50U, 0x3cU, 0x9fU, 0xa8U, + 0x51U, 0xa3U, 0x40U, 0x8fU, 0x92U, 0x9dU, 0x38U, 0xf5U, + 0xbcU, 0xb6U, 0xdaU, 0x21U, 0x10U, 0xffU, 0xf3U, 0xd2U, + 0xcdU, 0x0cU, 0x13U, 0xecU, 0x5fU, 0x97U, 0x44U, 0x17U, + 0xc4U, 0xa7U, 0x7eU, 0x3dU, 0x64U, 0x5dU, 0x19U, 0x73U, + 0x60U, 0x81U, 0x4fU, 0xdcU, 0x22U, 0x2aU, 0x90U, 0x88U, + 0x46U, 0xeeU, 0xb8U, 0x14U, 0xdeU, 0x5eU, 0x0bU, 0xdbU, + 0xe0U, 0x32U, 0x3aU, 0x0aU, 0x49U, 0x06U, 0x24U, 0x5cU, + 0xc2U, 0xd3U, 0xacU, 0x62U, 0x91U, 0x95U, 0xe4U, 0x79U, + 0xe7U, 0xc8U, 0x37U, 0x6dU, 0x8dU, 0xd5U, 0x4eU, 0xa9U, + 0x6cU, 0x56U, 0xf4U, 0xeaU, 0x65U, 0x7aU, 0xaeU, 0x08U, + 0xbaU, 0x78U, 0x25U, 0x2eU, 0x1cU, 0xa6U, 0xb4U, 0xc6U, + 0xe8U, 0xddU, 0x74U, 0x1fU, 0x4bU, 0xbdU, 0x8bU, 0x8aU, + 0x70U, 0x3eU, 0xb5U, 0x66U, 0x48U, 0x03U, 0xf6U, 0x0eU, + 0x61U, 0x35U, 0x57U, 0xb9U, 0x86U, 0xc1U, 0x1dU, 0x9eU, + 0xe1U, 0xf8U, 0x98U, 0x11U, 0x69U, 0xd9U, 0x8eU, 0x94U, + 0x9bU, 0x1eU, 0x87U, 0xe9U, 0xceU, 0x55U, 0x28U, 0xdfU, + 0x8cU, 0xa1U, 0x89U, 0x0dU, 0xbfU, 0xe6U, 0x42U, 0x68U, + 0x41U, 0x99U, 0x2dU, 0x0fU, 0xb0U, 0x54U, 0xbbU, 0x16U +}; +#define AES_XTIME(x) ((byte)((byte)((x) << 1) ^ ((0 - ((x) >> 7)) & 0x1b))) + +static word32 col_mul(word32 t, int i2, int i3, int ia, int ib) +{ + byte t3 = GETBYTE(t, i3); + byte tm = AES_XTIME(GETBYTE(t, i2) ^ t3); + + return GETBYTE(t, ia) ^ GETBYTE(t, ib) ^ t3 ^ tm; +} + +static word32 inv_col_mul(word32 t, int i9, int ib, int id, int ie) +{ + byte t9 = GETBYTE(t, i9); + byte tb = GETBYTE(t, ib); + byte td = GETBYTE(t, id); + byte te = GETBYTE(t, ie); + byte t0 = t9 ^ tb ^ td; + return t0 ^ AES_XTIME(AES_XTIME(AES_XTIME(t0 ^ te) ^ td ^ te) ^ tb ^ te); +} +#endif #if defined(HAVE_AES_CBC) || defined(WOLFSSL_AES_DIRECT) || defined(HAVE_AESGCM) @@ -1527,6 +1585,7 @@ static const byte Td4[256] = #endif +#ifndef WOLFSSL_AES_SMALL_TABLES /* load 4 Te Tables into cache by cache line stride */ static WC_INLINE word32 PreFetchTe(void) { @@ -1541,6 +1600,19 @@ static WC_INLINE word32 PreFetchTe(void) } return x; } +#else +/* load sbox into cache by cache line stride */ +static WC_INLINE word32 PreFetchSBox(void) +{ + word32 x = 0; + int i; + + for (i = 0; i < 256; i += WC_CACHE_LINE_SZ/4) { + x &= Tsbox[i]; + } + return x; +} +#endif /* Software AES - ECB Encrypt */ static void wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock) @@ -1620,11 +1692,13 @@ static void wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock) s3 = ByteReverseWord32(s3); #endif + /* AddRoundKey */ s0 ^= rk[0]; s1 ^= rk[1]; s2 ^= rk[2]; s3 ^= rk[3]; +#ifndef WOLFSSL_AES_SMALL_TABLES s0 |= PreFetchTe(); /* @@ -1633,28 +1707,28 @@ static void wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock) for (;;) { t0 = - Te[0][GETBYTE(s0, 3)] ^ - Te[1][GETBYTE(s1, 2)] ^ - Te[2][GETBYTE(s2, 1)] ^ - Te[3][GETBYTE(s3, 0)] ^ + Te[0][GETBYTE(s0, 3)] ^ + Te[1][GETBYTE(s1, 2)] ^ + Te[2][GETBYTE(s2, 1)] ^ + Te[3][GETBYTE(s3, 0)] ^ rk[4]; t1 = - Te[0][GETBYTE(s1, 3)] ^ - Te[1][GETBYTE(s2, 2)] ^ - Te[2][GETBYTE(s3, 1)] ^ - Te[3][GETBYTE(s0, 0)] ^ + Te[0][GETBYTE(s1, 3)] ^ + Te[1][GETBYTE(s2, 2)] ^ + Te[2][GETBYTE(s3, 1)] ^ + Te[3][GETBYTE(s0, 0)] ^ rk[5]; t2 = Te[0][GETBYTE(s2, 3)] ^ - Te[1][GETBYTE(s3, 2)] ^ - Te[2][GETBYTE(s0, 1)] ^ - Te[3][GETBYTE(s1, 0)] ^ + Te[1][GETBYTE(s3, 2)] ^ + Te[2][GETBYTE(s0, 1)] ^ + Te[3][GETBYTE(s1, 0)] ^ rk[6]; t3 = Te[0][GETBYTE(s3, 3)] ^ - Te[1][GETBYTE(s0, 2)] ^ - Te[2][GETBYTE(s1, 1)] ^ - Te[3][GETBYTE(s2, 0)] ^ + Te[1][GETBYTE(s0, 2)] ^ + Te[2][GETBYTE(s1, 1)] ^ + Te[3][GETBYTE(s2, 0)] ^ rk[7]; rk += 8; @@ -1717,6 +1791,84 @@ static void wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock) (Te[0][GETBYTE(t1, 1)] & 0x0000ff00) ^ (Te[1][GETBYTE(t2, 0)] & 0x000000ff) ^ rk[3]; +#else + s0 |= PreFetchSBox(); + + r *= 2; + /* Two rounds at a time */ + for (rk += 4; r > 1; r--, rk += 4) { + t0 = + ((word32)Tsbox[GETBYTE(s0, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s1, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s2, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s3, 0)]); + t1 = + ((word32)Tsbox[GETBYTE(s1, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s2, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s3, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s0, 0)]); + t2 = + ((word32)Tsbox[GETBYTE(s2, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s3, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s0, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s1, 0)]); + t3 = + ((word32)Tsbox[GETBYTE(s3, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s0, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s1, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s2, 0)]); + + s0 = + (col_mul(t0, 3, 2, 0, 1) << 24) ^ + (col_mul(t0, 2, 1, 0, 3) << 16) ^ + (col_mul(t0, 1, 0, 2, 3) << 8) ^ + (col_mul(t0, 0, 3, 2, 1) ) ^ + rk[0]; + s1 = + (col_mul(t1, 3, 2, 0, 1) << 24) ^ + (col_mul(t1, 2, 1, 0, 3) << 16) ^ + (col_mul(t1, 1, 0, 2, 3) << 8) ^ + (col_mul(t1, 0, 3, 2, 1) ) ^ + rk[1]; + s2 = + (col_mul(t2, 3, 2, 0, 1) << 24) ^ + (col_mul(t2, 2, 1, 0, 3) << 16) ^ + (col_mul(t2, 1, 0, 2, 3) << 8) ^ + (col_mul(t2, 0, 3, 2, 1) ) ^ + rk[2]; + s3 = + (col_mul(t3, 3, 2, 0, 1) << 24) ^ + (col_mul(t3, 2, 1, 0, 3) << 16) ^ + (col_mul(t3, 1, 0, 2, 3) << 8) ^ + (col_mul(t3, 0, 3, 2, 1) ) ^ + rk[3]; + } + + t0 = + ((word32)Tsbox[GETBYTE(s0, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s1, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s2, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s3, 0)]); + t1 = + ((word32)Tsbox[GETBYTE(s1, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s2, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s3, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s0, 0)]); + t2 = + ((word32)Tsbox[GETBYTE(s2, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s3, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s0, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s1, 0)]); + t3 = + ((word32)Tsbox[GETBYTE(s3, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(s0, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(s1, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(s2, 0)]); + s0 = t0 ^ rk[0]; + s1 = t1 ^ rk[1]; + s2 = t2 ^ rk[2]; + s3 = t3 ^ rk[3]; +#endif /* write out */ #ifdef LITTLE_ENDIAN_ORDER @@ -1738,6 +1890,7 @@ static void wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock) #if (defined(HAVE_AES_CBC) && !defined(WOLFSSL_DEVCRYPTO_CBC)) || \ defined(WOLFSSL_AES_DIRECT) +#ifndef WOLFSSL_AES_SMALL_TABLES /* load 4 Td Tables into cache by cache line stride */ static WC_INLINE word32 PreFetchTd(void) { @@ -1752,6 +1905,7 @@ static WC_INLINE word32 PreFetchTd(void) } return x; } +#endif /* load Td Table4 into cache by cache line stride */ static WC_INLINE word32 PreFetchTd4(void) @@ -1826,6 +1980,7 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) s2 ^= rk[2]; s3 ^= rk[3]; +#ifndef WOLFSSL_AES_SMALL_TABLES s0 |= PreFetchTd(); /* @@ -1919,6 +2074,83 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) ((word32)Td4[GETBYTE(t1, 1)] << 8) ^ ((word32)Td4[GETBYTE(t0, 0)]) ^ rk[3]; +#else + s0 |= PreFetchTd4(); + + r *= 2; + for (rk += 4; r > 1; r--, rk += 4) { + t0 = + ((word32)Td4[GETBYTE(s0, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s3, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s2, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s1, 0)]) ^ + rk[0]; + t1 = + ((word32)Td4[GETBYTE(s1, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s0, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s3, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s2, 0)]) ^ + rk[1]; + t2 = + ((word32)Td4[GETBYTE(s2, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s1, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s0, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s3, 0)]) ^ + rk[2]; + t3 = + ((word32)Td4[GETBYTE(s3, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s2, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s1, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s0, 0)]) ^ + rk[3]; + + s0 = + (inv_col_mul(t0, 0, 2, 1, 3) << 24) ^ + (inv_col_mul(t0, 3, 1, 0, 2) << 16) ^ + (inv_col_mul(t0, 2, 0, 3, 1) << 8) ^ + (inv_col_mul(t0, 1, 3, 2, 0) ); + s1 = + (inv_col_mul(t1, 0, 2, 1, 3) << 24) ^ + (inv_col_mul(t1, 3, 1, 0, 2) << 16) ^ + (inv_col_mul(t1, 2, 0, 3, 1) << 8) ^ + (inv_col_mul(t1, 1, 3, 2, 0) ); + s2 = + (inv_col_mul(t2, 0, 2, 1, 3) << 24) ^ + (inv_col_mul(t2, 3, 1, 0, 2) << 16) ^ + (inv_col_mul(t2, 2, 0, 3, 1) << 8) ^ + (inv_col_mul(t2, 1, 3, 2, 0) ); + s3 = + (inv_col_mul(t3, 0, 2, 1, 3) << 24) ^ + (inv_col_mul(t3, 3, 1, 0, 2) << 16) ^ + (inv_col_mul(t3, 2, 0, 3, 1) << 8) ^ + (inv_col_mul(t3, 1, 3, 2, 0) ); + } + + t0 = + ((word32)Td4[GETBYTE(s0, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s3, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s2, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s1, 0)]); + t1 = + ((word32)Td4[GETBYTE(s1, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s0, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s3, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s2, 0)]); + t2 = + ((word32)Td4[GETBYTE(s2, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s1, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s0, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s3, 0)]); + t3 = + ((word32)Td4[GETBYTE(s3, 3)] << 24) ^ + ((word32)Td4[GETBYTE(s2, 2)] << 16) ^ + ((word32)Td4[GETBYTE(s1, 1)] << 8) ^ + ((word32)Td4[GETBYTE(s0, 0)]); + s0 = t0 ^ rk[0]; + s1 = t1 ^ rk[1]; + s2 = t2 ^ rk[2]; + s3 = t3 ^ rk[3]; +#endif /* write out */ #ifdef LITTLE_ENDIAN_ORDER @@ -2317,10 +2549,17 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) { temp = rk[3]; rk[4] = rk[0] ^ + #ifndef WOLFSSL_AES_SMALL_TABLES (Te[2][GETBYTE(temp, 2)] & 0xff000000) ^ (Te[3][GETBYTE(temp, 1)] & 0x00ff0000) ^ (Te[0][GETBYTE(temp, 0)] & 0x0000ff00) ^ (Te[1][GETBYTE(temp, 3)] & 0x000000ff) ^ + #else + ((word32)Tsbox[GETBYTE(temp, 2)] << 24) ^ + ((word32)Tsbox[GETBYTE(temp, 1)] << 16) ^ + ((word32)Tsbox[GETBYTE(temp, 0)] << 8) ^ + ((word32)Tsbox[GETBYTE(temp, 3)]) ^ + #endif rcon[i]; rk[5] = rk[1] ^ rk[4]; rk[6] = rk[2] ^ rk[5]; @@ -2340,10 +2579,17 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) { temp = rk[ 5]; rk[ 6] = rk[ 0] ^ + #ifndef WOLFSSL_AES_SMALL_TABLES (Te[2][GETBYTE(temp, 2)] & 0xff000000) ^ (Te[3][GETBYTE(temp, 1)] & 0x00ff0000) ^ (Te[0][GETBYTE(temp, 0)] & 0x0000ff00) ^ (Te[1][GETBYTE(temp, 3)] & 0x000000ff) ^ + #else + ((word32)Tsbox[GETBYTE(temp, 2)] << 24) ^ + ((word32)Tsbox[GETBYTE(temp, 1)] << 16) ^ + ((word32)Tsbox[GETBYTE(temp, 0)] << 8) ^ + ((word32)Tsbox[GETBYTE(temp, 3)]) ^ + #endif rcon[i]; rk[ 7] = rk[ 1] ^ rk[ 6]; rk[ 8] = rk[ 2] ^ rk[ 7]; @@ -2364,10 +2610,17 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) { temp = rk[ 7]; rk[ 8] = rk[ 0] ^ + #ifndef WOLFSSL_AES_SMALL_TABLES (Te[2][GETBYTE(temp, 2)] & 0xff000000) ^ (Te[3][GETBYTE(temp, 1)] & 0x00ff0000) ^ (Te[0][GETBYTE(temp, 0)] & 0x0000ff00) ^ (Te[1][GETBYTE(temp, 3)] & 0x000000ff) ^ + #else + ((word32)Tsbox[GETBYTE(temp, 2)] << 24) ^ + ((word32)Tsbox[GETBYTE(temp, 1)] << 16) ^ + ((word32)Tsbox[GETBYTE(temp, 0)] << 8) ^ + ((word32)Tsbox[GETBYTE(temp, 3)]) ^ + #endif rcon[i]; rk[ 9] = rk[ 1] ^ rk[ 8]; rk[10] = rk[ 2] ^ rk[ 9]; @@ -2376,10 +2629,17 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) break; temp = rk[11]; rk[12] = rk[ 4] ^ + #ifndef WOLFSSL_AES_SMALL_TABLES (Te[2][GETBYTE(temp, 3)] & 0xff000000) ^ (Te[3][GETBYTE(temp, 2)] & 0x00ff0000) ^ (Te[0][GETBYTE(temp, 1)] & 0x0000ff00) ^ (Te[1][GETBYTE(temp, 0)] & 0x000000ff); + #else + ((word32)Tsbox[GETBYTE(temp, 3)] << 24) ^ + ((word32)Tsbox[GETBYTE(temp, 2)] << 16) ^ + ((word32)Tsbox[GETBYTE(temp, 1)] << 8) ^ + ((word32)Tsbox[GETBYTE(temp, 0)]); + #endif rk[13] = rk[ 5] ^ rk[12]; rk[14] = rk[ 6] ^ rk[13]; rk[15] = rk[ 7] ^ rk[14]; @@ -2393,7 +2653,7 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) return BAD_FUNC_ARG; } /* switch */ - #ifdef HAVE_AES_DECRYPT + #if defined(HAVE_AES_DECRYPT) if (dir == AES_DECRYPTION) { unsigned int j; rk = aes->key; @@ -2405,6 +2665,7 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp; temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp; } + #if !defined(WOLFSSL_AES_SMALL_TABLES) /* apply the inverse MixColumn transform to all round keys but the first and the last: */ for (i = 1; i < aes->rounds; i++) { @@ -2430,6 +2691,7 @@ static void wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock) Td[2][Te[1][GETBYTE(rk[3], 1)] & 0xff] ^ Td[3][Te[1][GETBYTE(rk[3], 0)] & 0xff]; } + #endif } #else (void)dir;