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/* Aes.c -- AES encryption / decryption↩
2017-01-24 : Igor Pavlov : Public domain */↩
↩
#include "Precomp.h"↩
↩
#include "Aes.h"↩
#include "CpuArch.h"↩
↩
static UInt32 T[256 * 4];↩
static const Byte Sbox[256] = {↩
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,↩
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,↩
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,↩
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,↩
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,↩
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,↩
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,↩
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,↩
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,↩
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,↩
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,↩
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,↩
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,↩
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,↩
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,↩
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16};↩
↩
void MY_FAST_CALL AesCbc_Encode(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
void MY_FAST_CALL AesCbc_Decode(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
void MY_FAST_CALL AesCtr_Code(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
↩
void MY_FAST_CALL AesCbc_Encode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
void MY_FAST_CALL AesCbc_Decode_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
void MY_FAST_CALL AesCtr_Code_Intel(UInt32 *ivAes, Byte *data, size_t numBlocks);↩
↩
AES_CODE_FUNC g_AesCbc_Encode;↩
AES_CODE_FUNC g_AesCbc_Decode;↩
AES_CODE_FUNC g_AesCtr_Code;↩
↩
static UInt32 D[256 * 4];↩
static Byte InvS[256];↩
↩
static const Byte Rcon[11] = { 0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };↩
↩
#define xtime(x) ((((x) << 1) ^ (((x) & 0x80) != 0 ? 0x1B : 0)) & 0xFF)↩
↩
#define Ui32(a0, a1, a2, a3) ((UInt32)(a0) | ((UInt32)(a1) << 8) | ((UInt32)(a2) << 16) | ((UInt32)(a3) << 24))↩
↩
#define gb0(x) ( (x) & 0xFF)↩
#define gb1(x) (((x) >> ( 8)) & 0xFF)↩
#define gb2(x) (((x) >> (16)) & 0xFF)↩
#define gb3(x) (((x) >> (24)))↩
↩
#define gb(n, x) gb ## n(x)↩
↩
#define TT(x) (T + (x << 8))↩
#define DD(x) (D + (x << 8))↩
↩
↩
void AesGenTables(void)↩
{↩
unsigned i;↩
for (i = 0; i < 256; i++)↩
InvS[Sbox[i]] = (Byte)i;↩
↩
for (i = 0; i < 256; i++)↩
{↩
{↩
UInt32 a1 = Sbox[i];↩
UInt32 a2 = xtime(a1);↩
UInt32 a3 = a2 ^ a1;↩
TT(0)[i] = Ui32(a2, a1, a1, a3);↩
TT(1)[i] = Ui32(a3, a2, a1, a1);↩
TT(2)[i] = Ui32(a1, a3, a2, a1);↩
TT(3)[i] = Ui32(a1, a1, a3, a2);↩
}↩
{↩
UInt32 a1 = InvS[i];↩
UInt32 a2 = xtime(a1);↩
UInt32 a4 = xtime(a2);↩
UInt32 a8 = xtime(a4);↩
UInt32 a9 = a8 ^ a1;↩
UInt32 aB = a8 ^ a2 ^ a1;↩
UInt32 aD = a8 ^ a4 ^ a1;↩
UInt32 aE = a8 ^ a4 ^ a2;↩
DD(0)[i] = Ui32(aE, a9, aD, aB);↩
DD(1)[i] = Ui32(aB, aE, a9, aD);↩
DD(2)[i] = Ui32(aD, aB, aE, a9);↩
DD(3)[i] = Ui32(a9, aD, aB, aE);↩
}↩
}↩
↩
g_AesCbc_Encode = AesCbc_Encode;↩
g_AesCbc_Decode = AesCbc_Decode;↩
g_AesCtr_Code = AesCtr_Code;↩
↩
#ifdef MY_CPU_X86_OR_AMD64↩
if (CPU_Is_Aes_Supported())↩
{↩
g_AesCbc_Encode = AesCbc_Encode_Intel;↩
g_AesCbc_Decode = AesCbc_Decode_Intel;↩
g_AesCtr_Code = AesCtr_Code_Intel;↩
}↩
#endif↩
}↩
↩
↩
#define HT(i, x, s) TT(x)[gb(x, s[(i + x) & 3])]↩
↩
#define HT4(m, i, s, p) m[i] = \↩
HT(i, 0, s) ^ \↩
HT(i, 1, s) ^ \↩
HT(i, 2, s) ^ \↩
HT(i, 3, s) ^ w[p + i]↩
↩
#define HT16(m, s, p) \↩
HT4(m, 0, s, p); \↩
HT4(m, 1, s, p); \↩
HT4(m, 2, s, p); \↩
HT4(m, 3, s, p); \↩
↩
#define FT(i, x) Sbox[gb(x, m[(i + x) & 3])]↩
#define FT4(i) dest[i] = Ui32(FT(i, 0), FT(i, 1), FT(i, 2), FT(i, 3)) ^ w[i];↩
↩
↩
#define HD(i, x, s) DD(x)[gb(x, s[(i - x) & 3])]↩
↩
#define HD4(m, i, s, p) m[i] = \↩
HD(i, 0, s) ^ \↩
HD(i, 1, s) ^ \↩
HD(i, 2, s) ^ \↩
HD(i, 3, s) ^ w[p + i];↩
↩
#define HD16(m, s, p) \↩
HD4(m, 0, s, p); \↩
HD4(m, 1, s, p); \↩
HD4(m, 2, s, p); \↩
HD4(m, 3, s, p); \↩
↩
#define FD(i, x) InvS[gb(x, m[(i - x) & 3])]↩
#define FD4(i) dest[i] = Ui32(FD(i, 0), FD(i, 1), FD(i, 2), FD(i, 3)) ^ w[i];↩
↩
void MY_FAST_CALL Aes_SetKey_Enc(UInt32 *w, const Byte *key, unsigned keySize)↩
{↩
unsigned i, wSize;↩
wSize = keySize + 28;↩
keySize /= 4;↩
w[0] = ((UInt32)keySize / 2) + 3;↩
w += 4;↩
↩
for (i = 0; i < keySize; i++, key += 4)↩
w[i] = GetUi32(key);↩
↩
for (; i < wSize; i++)↩
{↩
UInt32 t = w[(size_t)i - 1];↩
unsigned rem = i % keySize;↩
if (rem == 0)↩
t = Ui32(Sbox[gb1(t)] ^ Rcon[i / keySize], Sbox[gb2(t)], Sbox[gb3(t)], Sbox[gb0(t)]);↩
else if (keySize > 6 && rem == 4)↩
t = Ui32(Sbox[gb0(t)], Sbox[gb1(t)], Sbox[gb2(t)], Sbox[gb3(t)]);↩
w[i] = w[i - keySize] ^ t;↩
}↩
}↩
↩
void MY_FAST_CALL Aes_SetKey_Dec(UInt32 *w, const Byte *key, unsigned keySize)↩
{↩
unsigned i, num;↩
Aes_SetKey_Enc(w, key, keySize);↩
num = keySize + 20;↩
w += 8;↩
for (i = 0; i < num; i++)↩
{↩
UInt32 r = w[i];↩
w[i] =↩
DD(0)[Sbox[gb0(r)]] ^↩
DD(1)[Sbox[gb1(r)]] ^↩
DD(2)[Sbox[gb2(r)]] ^↩
DD(3)[Sbox[gb3(r)]];↩
}↩
}↩
↩
/* Aes_Encode and Aes_Decode functions work with little-endian words.↩
src and dest are pointers to 4 UInt32 words.↩
src and dest can point to same block */↩
↩
static void Aes_Encode(const UInt32 *w, UInt32 *dest, const UInt32 *src)↩
{↩
UInt32 s[4];↩
UInt32 m[4];↩
UInt32 numRounds2 = w[0];↩
w += 4;↩
s[0] = src[0] ^ w[0];↩
s[1] = src[1] ^ w[1];↩
s[2] = src[2] ^ w[2];↩
s[3] = src[3] ^ w[3];↩
w += 4;↩
for (;;)↩
{↩
HT16(m, s, 0);↩
if (--numRounds2 == 0)↩
break;↩
HT16(s, m, 4);↩
w += 8;↩
}↩
w += 4;↩
FT4(0); FT4(1); FT4(2); FT4(3);↩
}↩
↩
static void Aes_Decode(const UInt32 *w, UInt32 *dest, const UInt32 *src)↩
{↩
UInt32 s[4];↩
UInt32 m[4];↩
UInt32 numRounds2 = w[0];↩
w += 4 + numRounds2 * 8;↩
s[0] = src[0] ^ w[0];↩
s[1] = src[1] ^ w[1];↩
s[2] = src[2] ^ w[2];↩
s[3] = src[3] ^ w[3];↩
for (;;)↩
{↩
w -= 8;↩
HD16(m, s, 4);↩
if (--numRounds2 == 0)↩
break;↩
HD16(s, m, 0);↩
}↩
FD4(0); FD4(1); FD4(2); FD4(3);↩
}↩
↩
void AesCbc_Init(UInt32 *p, const Byte *iv)↩
{↩
unsigned i;↩
for (i = 0; i < 4; i++)↩
p[i] = GetUi32(iv + i * 4);↩
}↩
↩
void MY_FAST_CALL AesCbc_Encode(UInt32 *p, Byte *data, size_t numBlocks)↩
{↩
for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)↩
{↩
p[0] ^= GetUi32(data);↩
p[1] ^= GetUi32(data + 4);↩
p[2] ^= GetUi32(data + 8);↩
p[3] ^= GetUi32(data + 12);↩
↩
Aes_Encode(p + 4, p, p);↩
↩
SetUi32(data, p[0]);↩
SetUi32(data + 4, p[1]);↩
SetUi32(data + 8, p[2]);↩
SetUi32(data + 12, p[3]);↩
}↩
}↩
↩
void MY_FAST_CALL AesCbc_Decode(UInt32 *p, Byte *data, size_t numBlocks)↩
{↩
UInt32 in[4], out[4];↩
for (; numBlocks != 0; numBlocks--, data += AES_BLOCK_SIZE)↩
{↩
in[0] = GetUi32(data);↩
in[1] = GetUi32(data + 4);↩
in[2] = GetUi32(data + 8);↩
in[3] = GetUi32(data + 12);↩
↩
Aes_Decode(p + 4, out, in);↩
↩
SetUi32(data, p[0] ^ out[0]);↩
SetUi32(data + 4, p[1] ^ out[1]);↩
SetUi32(data + 8, p[2] ^ out[2]);↩
SetUi32(data + 12, p[3] ^ out[3]);↩
↩
p[0] = in[0];↩
p[1] = in[1];↩
p[2] = in[2];↩
p[3] = in[3];↩
}↩
}↩
↩
void MY_FAST_CALL AesCtr_Code(UInt32 *p, Byte *data, size_t numBlocks)↩
{↩
for (; numBlocks != 0; numBlocks--)↩
{↩
UInt32 temp[4];↩
unsigned i;↩
↩
if (++p[0] == 0)↩
p[1]++;↩
↩
Aes_Encode(p + 4, temp, p);↩
↩
for (i = 0; i < 4; i++, data += 4)↩
{↩
UInt32 t = temp[i];↩
↩
#ifdef MY_CPU_LE_UNALIGN↩
*((UInt32 *)data) ^= t;↩
#else↩
data[0] ^= (t & 0xFF);↩
data[1] ^= ((t >> 8) & 0xFF);↩
data[2] ^= ((t >> 16) & 0xFF);↩
data[3] ^= ((t >> 24));↩
#endif↩
}↩
}↩
}↩