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| #include "tinyaes.h"
| #include <string.h>
|
| #define Nb 4
| #define Nk 4
| #define Nr 10
|
| typedef uint8_t state_t[4][4];
|
| static const uint8_t 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
| };
|
| static const uint8_t rsbox[256] = {
| 0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb,
| 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb,
| 0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e,
| 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25,
| 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92,
| 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84,
| 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06,
| 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b,
| 0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73,
| 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e,
| 0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b,
| 0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4,
| 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f,
| 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef,
| 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61,
| 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d
| };
|
| static const uint8_t Rcon[11] = {
| 0x8d,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36
| };
|
| #define getSBoxValue(num) (sbox[(num)])
|
| static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key)
| {
| unsigned i, j, k;
| uint8_t tempa[4];
| for (i = 0; i < Nk; ++i) {
| RoundKey[(i * 4) + 0] = Key[(i * 4) + 0];
| RoundKey[(i * 4) + 1] = Key[(i * 4) + 1];
| RoundKey[(i * 4) + 2] = Key[(i * 4) + 2];
| RoundKey[(i * 4) + 3] = Key[(i * 4) + 3];
| }
| for (i = Nk; i < Nb * (Nr + 1); ++i) {
| k = (i - 1) * 4;
| tempa[0]=RoundKey[k + 0];
| tempa[1]=RoundKey[k + 1];
| tempa[2]=RoundKey[k + 2];
| tempa[3]=RoundKey[k + 3];
| if (i % Nk == 0) {
| const uint8_t u8tmp = tempa[0];
| tempa[0] = tempa[1];
| tempa[1] = tempa[2];
| tempa[2] = tempa[3];
| tempa[3] = u8tmp;
| tempa[0] = getSBoxValue(tempa[0]);
| tempa[1] = getSBoxValue(tempa[1]);
| tempa[2] = getSBoxValue(tempa[2]);
| tempa[3] = getSBoxValue(tempa[3]);
| tempa[0] = tempa[0] ^ Rcon[i/Nk];
| }
| j = i * 4; k=(i - Nk) * 4;
| RoundKey[j + 0] = RoundKey[k + 0] ^ tempa[0];
| RoundKey[j + 1] = RoundKey[k + 1] ^ tempa[1];
| RoundKey[j + 2] = RoundKey[k + 2] ^ tempa[2];
| RoundKey[j + 3] = RoundKey[k + 3] ^ tempa[3];
| }
| }
|
| void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv)
| {
| KeyExpansion(ctx->RoundKey, key);
| memcpy(ctx->Iv, iv, AES_BLOCKLEN);
| }
|
| static void AddRoundKey(uint8_t round, state_t* state, const uint8_t* RoundKey)
| {
| uint8_t i,j;
| for (i = 0; i < 4; ++i)
| for (j = 0; j < 4; ++j)
| (*state)[i][j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
| }
|
| static void SubBytes(state_t* state)
| {
| uint8_t i, j;
| for (i = 0; i < 4; ++i)
| for (j = 0; j < 4; ++j)
| (*state)[j][i] = getSBoxValue((*state)[j][i]);
| }
|
| static void ShiftRows(state_t* state)
| {
| uint8_t temp;
| temp = (*state)[0][1];
| (*state)[0][1] = (*state)[1][1];
| (*state)[1][1] = (*state)[2][1];
| (*state)[2][1] = (*state)[3][1];
| (*state)[3][1] = temp;
| temp = (*state)[0][2];
| (*state)[0][2] = (*state)[2][2];
| (*state)[2][2] = temp;
| temp = (*state)[1][2];
| (*state)[1][2] = (*state)[3][2];
| (*state)[3][2] = temp;
| temp = (*state)[0][3];
| (*state)[0][3] = (*state)[3][3];
| (*state)[3][3] = (*state)[2][3];
| (*state)[2][3] = (*state)[1][3];
| (*state)[1][3] = temp;
| }
|
| static uint8_t xtime(uint8_t x)
| {
| return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
| }
|
| static void MixColumns(state_t* state)
| {
| uint8_t i;
| uint8_t Tmp, Tm, t;
| for (i = 0; i < 4; ++i) {
| t = (*state)[i][0];
| Tmp = (*state)[i][0] ^ (*state)[i][1] ^ (*state)[i][2] ^ (*state)[i][3];
| Tm = (*state)[i][0] ^ (*state)[i][1]; Tm = xtime(Tm); (*state)[i][0] ^= Tm ^ Tmp;
| Tm = (*state)[i][1] ^ (*state)[i][2]; Tm = xtime(Tm); (*state)[i][1] ^= Tm ^ Tmp;
| Tm = (*state)[i][2] ^ (*state)[i][3]; Tm = xtime(Tm); (*state)[i][2] ^= Tm ^ Tmp;
| Tm = (*state)[i][3] ^ t; Tm = xtime(Tm); (*state)[i][3] ^= Tm ^ Tmp;
| }
| }
|
| static uint8_t Multiply(uint8_t x, uint8_t y)
| {
| return (((y & 1) * x) ^
| ((y>>1 & 1) * xtime(x)) ^
| ((y>>2 & 1) * xtime(xtime(x))) ^
| ((y>>3 & 1) * xtime(xtime(xtime(x)))) ^
| ((y>>4 & 1) * xtime(xtime(xtime(xtime(x))))));
| }
|
| static void InvMixColumns(state_t* state)
| {
| int i;
| uint8_t a, b, c, d;
| for (i = 0; i < 4; ++i) {
| a = (*state)[i][0];
| b = (*state)[i][1];
| c = (*state)[i][2];
| d = (*state)[i][3];
| (*state)[i][0] = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
| (*state)[i][1] = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
| (*state)[i][2] = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
| (*state)[i][3] = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
| }
| }
|
| static void InvSubBytes(state_t* state)
| {
| uint8_t i, j;
| for (i = 0; i < 4; ++i)
| for (j = 0; j < 4; ++j)
| (*state)[j][i] = rsbox[(*state)[j][i]];
| }
|
| static void InvShiftRows(state_t* state)
| {
| uint8_t temp;
| temp = (*state)[3][1];
| (*state)[3][1] = (*state)[2][1];
| (*state)[2][1] = (*state)[1][1];
| (*state)[1][1] = (*state)[0][1];
| (*state)[0][1] = temp;
| temp = (*state)[0][2];
| (*state)[0][2] = (*state)[2][2];
| (*state)[2][2] = temp;
| temp = (*state)[1][2];
| (*state)[1][2] = (*state)[3][2];
| (*state)[3][2] = temp;
| temp = (*state)[0][3];
| (*state)[0][3] = (*state)[1][3];
| (*state)[1][3] = (*state)[2][3];
| (*state)[2][3] = (*state)[3][3];
| (*state)[3][3] = temp;
| }
|
| static void Cipher(state_t* state, const uint8_t* RoundKey)
| {
| uint8_t round = 0;
| AddRoundKey(0, state, RoundKey);
| for (round = 1; ; ++round) {
| SubBytes(state);
| ShiftRows(state);
| if (round == Nr) break;
| MixColumns(state);
| AddRoundKey(round, state, RoundKey);
| }
| AddRoundKey(Nr, state, RoundKey);
| }
|
| static void InvCipher(state_t* state, const uint8_t* RoundKey)
| {
| uint8_t round = 0;
| AddRoundKey(Nr, state, RoundKey);
| for (round = (Nr - 1); ; --round) {
| InvShiftRows(state);
| InvSubBytes(state);
| AddRoundKey(round, state, RoundKey);
| if (round == 0) break;
| InvMixColumns(state);
| }
| }
|
| static void XorWithIv(uint8_t* buf, const uint8_t* Iv)
| {
| uint8_t i;
| for (i = 0; i < AES_BLOCKLEN; ++i)
| buf[i] ^= Iv[i];
| }
|
| void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length)
| {
| size_t i;
| uint8_t* Iv = ctx->Iv;
| for (i = 0; i < length; i += AES_BLOCKLEN) {
| XorWithIv(buf, Iv);
| Cipher((state_t*)buf, ctx->RoundKey);
| Iv = buf;
| buf += AES_BLOCKLEN;
| }
| memcpy(ctx->Iv, Iv, AES_BLOCKLEN);
| }
|
| void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length)
| {
| size_t i;
| uint8_t storeNextIv[AES_BLOCKLEN];
| for (i = 0; i < length; i += AES_BLOCKLEN) {
| memcpy(storeNextIv, buf, AES_BLOCKLEN);
| InvCipher((state_t*)buf, ctx->RoundKey);
| XorWithIv(buf, ctx->Iv);
| memcpy(ctx->Iv, storeNextIv, AES_BLOCKLEN);
| buf += AES_BLOCKLEN;
| }
| }
|
|
