diff options
Diffstat (limited to 'drivers/staging/rt2860/common/cmm_aes.c')
| -rw-r--r-- | drivers/staging/rt2860/common/cmm_aes.c | 1313 |
1 files changed, 1313 insertions, 0 deletions
diff --git a/drivers/staging/rt2860/common/cmm_aes.c b/drivers/staging/rt2860/common/cmm_aes.c new file mode 100644 index 000000000000..250357c5cd65 --- /dev/null +++ b/drivers/staging/rt2860/common/cmm_aes.c @@ -0,0 +1,1313 @@ +/* + ************************************************************************* + * Ralink Tech Inc. + * 5F., No.36, Taiyuan St., Jhubei City, + * Hsinchu County 302, + * Taiwan, R.O.C. + * + * (c) Copyright 2002-2007, Ralink Technology, Inc. + * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + * * + ************************************************************************* + + Module Name: + cmm_aes.c + + Abstract: + + Revision History: + Who When What + -------- ---------- ---------------------------------------------- + Paul Wu 02-25-02 Initial +*/ + +#include "../rt_config.h" + +struct aes_context { + u32 erk[64]; /* encryption round keys */ + u32 drk[64]; /* decryption round keys */ + int nr; /* number of rounds */ +}; + +/*****************************/ +/******** SBOX Table *********/ +/*****************************/ + +u8 SboxTable[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 xor_32(u8 *a, u8 *b, u8 *out) +{ + int i; + + for (i = 0; i < 4; i++) { + out[i] = a[i] ^ b[i]; + } +} + +void xor_128(u8 *a, u8 *b, u8 *out) +{ + int i; + + for (i = 0; i < 16; i++) { + out[i] = a[i] ^ b[i]; + } +} + +u8 RTMPCkipSbox(u8 a) +{ + return SboxTable[(int)a]; +} + +void next_key(u8 *key, int round) +{ + u8 rcon; + u8 sbox_key[4]; + u8 rcon_table[12] = { + 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, + 0x1b, 0x36, 0x36, 0x36 + }; + + sbox_key[0] = RTMPCkipSbox(key[13]); + sbox_key[1] = RTMPCkipSbox(key[14]); + sbox_key[2] = RTMPCkipSbox(key[15]); + sbox_key[3] = RTMPCkipSbox(key[12]); + + rcon = rcon_table[round]; + + xor_32(&key[0], sbox_key, &key[0]); + key[0] = key[0] ^ rcon; + + xor_32(&key[4], &key[0], &key[4]); + xor_32(&key[8], &key[4], &key[8]); + xor_32(&key[12], &key[8], &key[12]); +} + +void byte_sub(u8 *in, u8 *out) +{ + int i; + + for (i = 0; i < 16; i++) { + out[i] = RTMPCkipSbox(in[i]); + } +} + +/************************************/ +/* bitwise_xor() */ +/* A 128 bit, bitwise exclusive or */ +/************************************/ + +void bitwise_xor(unsigned char *ina, unsigned char *inb, unsigned char *out) +{ + int i; + for (i = 0; i < 16; i++) { + out[i] = ina[i] ^ inb[i]; + } +} + +void shift_row(u8 *in, u8 *out) +{ + out[0] = in[0]; + out[1] = in[5]; + out[2] = in[10]; + out[3] = in[15]; + out[4] = in[4]; + out[5] = in[9]; + out[6] = in[14]; + out[7] = in[3]; + out[8] = in[8]; + out[9] = in[13]; + out[10] = in[2]; + out[11] = in[7]; + out[12] = in[12]; + out[13] = in[1]; + out[14] = in[6]; + out[15] = in[11]; +} + +void mix_column(u8 *in, u8 *out) +{ + int i; + u8 add1b[4]; + u8 add1bf7[4]; + u8 rotl[4]; + u8 swap_halfs[4]; + u8 andf7[4]; + u8 rotr[4]; + u8 temp[4]; + u8 tempb[4]; + + for (i = 0; i < 4; i++) { + if ((in[i] & 0x80) == 0x80) + add1b[i] = 0x1b; + else + add1b[i] = 0x00; + } + + swap_halfs[0] = in[2]; /* Swap halfs */ + swap_halfs[1] = in[3]; + swap_halfs[2] = in[0]; + swap_halfs[3] = in[1]; + + rotl[0] = in[3]; /* Rotate left 8 bits */ + rotl[1] = in[0]; + rotl[2] = in[1]; + rotl[3] = in[2]; + + andf7[0] = in[0] & 0x7f; + andf7[1] = in[1] & 0x7f; + andf7[2] = in[2] & 0x7f; + andf7[3] = in[3] & 0x7f; + + for (i = 3; i > 0; i--) { /* logical shift left 1 bit */ + andf7[i] = andf7[i] << 1; + if ((andf7[i - 1] & 0x80) == 0x80) { + andf7[i] = (andf7[i] | 0x01); + } + } + andf7[0] = andf7[0] << 1; + andf7[0] = andf7[0] & 0xfe; + + xor_32(add1b, andf7, add1bf7); + + xor_32(in, add1bf7, rotr); + + temp[0] = rotr[0]; /* Rotate right 8 bits */ + rotr[0] = rotr[1]; + rotr[1] = rotr[2]; + rotr[2] = rotr[3]; + rotr[3] = temp[0]; + + xor_32(add1bf7, rotr, temp); + xor_32(swap_halfs, rotl, tempb); + xor_32(temp, tempb, out); +} + +/************************************************/ +/* construct_mic_header1() */ +/* Builds the first MIC header block from */ +/* header fields. */ +/************************************************/ + +void construct_mic_header1(unsigned char *mic_header1, + int header_length, unsigned char *mpdu) +{ + mic_header1[0] = (unsigned char)((header_length - 2) / 256); + mic_header1[1] = (unsigned char)((header_length - 2) % 256); + mic_header1[2] = mpdu[0] & 0xcf; /* Mute CF poll & CF ack bits */ + mic_header1[3] = mpdu[1] & 0xc7; /* Mute retry, more data and pwr mgt bits */ + mic_header1[4] = mpdu[4]; /* A1 */ + mic_header1[5] = mpdu[5]; + mic_header1[6] = mpdu[6]; + mic_header1[7] = mpdu[7]; + mic_header1[8] = mpdu[8]; + mic_header1[9] = mpdu[9]; + mic_header1[10] = mpdu[10]; /* A2 */ + mic_header1[11] = mpdu[11]; + mic_header1[12] = mpdu[12]; + mic_header1[13] = mpdu[13]; + mic_header1[14] = mpdu[14]; + mic_header1[15] = mpdu[15]; +} + +/************************************************/ +/* construct_mic_header2() */ +/* Builds the last MIC header block from */ +/* header fields. */ +/************************************************/ + +void construct_mic_header2(unsigned char *mic_header2, + unsigned char *mpdu, int a4_exists, int qc_exists) +{ + int i; + + for (i = 0; i < 16; i++) + mic_header2[i] = 0x00; + + mic_header2[0] = mpdu[16]; /* A3 */ + mic_header2[1] = mpdu[17]; + mic_header2[2] = mpdu[18]; + mic_header2[3] = mpdu[19]; + mic_header2[4] = mpdu[20]; + mic_header2[5] = mpdu[21]; + + /* In Sequence Control field, mute sequence numer bits (12-bit) */ + mic_header2[6] = mpdu[22] & 0x0f; /* SC */ + mic_header2[7] = 0x00; /* mpdu[23]; */ + + if ((!qc_exists) & a4_exists) { + for (i = 0; i < 6; i++) + mic_header2[8 + i] = mpdu[24 + i]; /* A4 */ + + } + + if (qc_exists && (!a4_exists)) { + mic_header2[8] = mpdu[24] & 0x0f; /* mute bits 15 - 4 */ + mic_header2[9] = mpdu[25] & 0x00; + } + + if (qc_exists && a4_exists) { + for (i = 0; i < 6; i++) + mic_header2[8 + i] = mpdu[24 + i]; /* A4 */ + + mic_header2[14] = mpdu[30] & 0x0f; + mic_header2[15] = mpdu[31] & 0x00; + } +} + +/************************************************/ +/* construct_mic_iv() */ +/* Builds the MIC IV from header fields and PN */ +/************************************************/ + +void construct_mic_iv(unsigned char *mic_iv, + int qc_exists, + int a4_exists, + unsigned char *mpdu, + unsigned int payload_length, unsigned char *pn_vector) +{ + int i; + + mic_iv[0] = 0x59; + if (qc_exists && a4_exists) + mic_iv[1] = mpdu[30] & 0x0f; /* QoS_TC */ + if (qc_exists && !a4_exists) + mic_iv[1] = mpdu[24] & 0x0f; /* mute bits 7-4 */ + if (!qc_exists) + mic_iv[1] = 0x00; + for (i = 2; i < 8; i++) + mic_iv[i] = mpdu[i + 8]; /* mic_iv[2:7] = A2[0:5] = mpdu[10:15] */ +#ifdef CONSISTENT_PN_ORDER + for (i = 8; i < 14; i++) + mic_iv[i] = pn_vector[i - 8]; /* mic_iv[8:13] = PN[0:5] */ +#else + for (i = 8; i < 14; i++) + mic_iv[i] = pn_vector[13 - i]; /* mic_iv[8:13] = PN[5:0] */ +#endif + i = (payload_length / 256); + i = (payload_length % 256); + mic_iv[14] = (unsigned char)(payload_length / 256); + mic_iv[15] = (unsigned char)(payload_length % 256); + +} + +/****************************************/ +/* aes128k128d() */ +/* Performs a 128 bit AES encrypt with */ +/* 128 bit data. */ +/****************************************/ +void aes128k128d(unsigned char *key, unsigned char *data, + unsigned char *ciphertext) +{ + int round; + int i; + unsigned char intermediatea[16]; + unsigned char intermediateb[16]; + unsigned char round_key[16]; + + for (i = 0; i < 16; i++) + round_key[i] = key[i]; + + for (round = 0; round < 11; round++) { + if (round == 0) { + xor_128(round_key, data, ciphertext); + next_key(round_key, round); + } else if (round == 10) { + byte_sub(ciphertext, intermediatea); + shift_row(intermediatea, intermediateb); + xor_128(intermediateb, round_key, ciphertext); + } else { /* 1 - 9 */ + + byte_sub(ciphertext, intermediatea); + shift_row(intermediatea, intermediateb); + mix_column(&intermediateb[0], &intermediatea[0]); + mix_column(&intermediateb[4], &intermediatea[4]); + mix_column(&intermediateb[8], &intermediatea[8]); + mix_column(&intermediateb[12], &intermediatea[12]); + xor_128(intermediatea, round_key, ciphertext); + next_key(round_key, round); + } + } + +} + +void construct_ctr_preload(unsigned char *ctr_preload, + int a4_exists, + int qc_exists, + unsigned char *mpdu, unsigned char *pn_vector, int c) +{ + + int i = 0; + for (i = 0; i < 16; i++) + ctr_preload[i] = 0x00; + i = 0; + + ctr_preload[0] = 0x01; /* flag */ + if (qc_exists && a4_exists) + ctr_preload[1] = mpdu[30] & 0x0f; /* QoC_Control */ + if (qc_exists && !a4_exists) + ctr_preload[1] = mpdu[24] & 0x0f; + + for (i = 2; i < 8; i++) + ctr_preload[i] = mpdu[i + 8]; /* ctr_preload[2:7] = A2[0:5] = mpdu[10:15] */ +#ifdef CONSISTENT_PN_ORDER + for (i = 8; i < 14; i++) + ctr_preload[i] = pn_vector[i - 8]; /* ctr_preload[8:13] = PN[0:5] */ +#else + for (i = 8; i < 14; i++) + ctr_preload[i] = pn_vector[13 - i]; /* ctr_preload[8:13] = PN[5:0] */ +#endif + ctr_preload[14] = (unsigned char)(c / 256); /* Ctr */ + ctr_preload[15] = (unsigned char)(c % 256); + +} + +BOOLEAN RTMPSoftDecryptAES(struct rt_rtmp_adapter *pAd, + u8 *pData, + unsigned long DataByteCnt, struct rt_cipher_key *pWpaKey) +{ + u8 KeyID; + u32 HeaderLen; + u8 PN[6]; + u32 payload_len; + u32 num_blocks; + u32 payload_remainder; + u16 fc; + u8 fc0; + u8 fc1; + u32 frame_type; + u32 frame_subtype; + u32 from_ds; + u32 to_ds; + int a4_exists; + int qc_exists; + u8 aes_out[16]; + int payload_index; + u32 i; + u8 ctr_preload[16]; + u8 chain_buffer[16]; + u8 padded_buffer[16]; + u8 mic_iv[16]; + u8 mic_header1[16]; + u8 mic_header2[16]; + u8 MIC[8]; + u8 TrailMIC[8]; + + fc0 = *pData; + fc1 = *(pData + 1); + + fc = *((u16 *)pData); + + frame_type = ((fc0 >> 2) & 0x03); + frame_subtype = ((fc0 >> 4) & 0x0f); + + from_ds = (fc1 & 0x2) >> 1; + to_ds = (fc1 & 0x1); + + a4_exists = (from_ds & to_ds); + qc_exists = ((frame_subtype == 0x08) || /* Assumed QoS subtypes */ + (frame_subtype == 0x09) || /* Likely to change. */ + (frame_subtype == 0x0a) || (frame_subtype == 0x0b) + ); + + HeaderLen = 24; + if (a4_exists) + HeaderLen += 6; + + KeyID = *((u8 *)(pData + HeaderLen + 3)); + KeyID = KeyID >> 6; + + if (pWpaKey[KeyID].KeyLen == 0) { + DBGPRINT(RT_DEBUG_TRACE, + ("RTMPSoftDecryptAES failed!(KeyID[%d] Length can not be 0)\n", + KeyID)); + return FALSE; + } + + PN[0] = *(pData + HeaderLen); + PN[1] = *(pData + HeaderLen + 1); + PN[2] = *(pData + HeaderLen + 4); + PN[3] = *(pData + HeaderLen + 5); + PN[4] = *(pData + HeaderLen + 6); + PN[5] = *(pData + HeaderLen + 7); + + payload_len = DataByteCnt - HeaderLen - 8 - 8; /* 8 bytes for CCMP header , 8 bytes for MIC */ + payload_remainder = (payload_len) % 16; + num_blocks = (payload_len) / 16; + + /* Find start of payload */ + payload_index = HeaderLen + 8; /*IV+EIV */ + + for (i = 0; i < num_blocks; i++) { + construct_ctr_preload(ctr_preload, + a4_exists, qc_exists, pData, PN, i + 1); + + aes128k128d(pWpaKey[KeyID].Key, ctr_preload, aes_out); + + bitwise_xor(aes_out, pData + payload_index, chain_buffer); + NdisMoveMemory(pData + payload_index - 8, chain_buffer, 16); + payload_index += 16; + } + + /* */ + /* If there is a short final block, then pad it */ + /* encrypt it and copy the unpadded part back */ + /* */ + if (payload_remainder > 0) { + construct_ctr_preload(ctr_preload, + a4_exists, + qc_exists, pData, PN, num_blocks + 1); + + NdisZeroMemory(padded_buffer, 16); + NdisMoveMemory(padded_buffer, pData + payload_index, + payload_remainder); + + aes128k128d(pWpaKey[KeyID].Key, ctr_preload, aes_out); + + bitwise_xor(aes_out, padded_buffer, chain_buffer); + NdisMoveMemory(pData + payload_index - 8, chain_buffer, + payload_remainder); + payload_index += payload_remainder; + } + /* */ + /* Descrypt the MIC */ + /* */ + construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pData, PN, 0); + NdisZeroMemory(padded_buffer, 16); + NdisMoveMemory(padded_buffer, pData + payload_index, 8); + + aes128k128d(pWpaKey[KeyID].Key, ctr_preload, aes_out); + + bitwise_xor(aes_out, padded_buffer, chain_buffer); + + NdisMoveMemory(TrailMIC, chain_buffer, 8); + + /* */ + /* Calculate MIC */ + /* */ + + /*Force the protected frame bit on */ + *(pData + 1) = *(pData + 1) | 0x40; + + /* Find start of payload */ + /* Because the CCMP header has been removed */ + payload_index = HeaderLen; + + construct_mic_iv(mic_iv, qc_exists, a4_exists, pData, payload_len, PN); + + construct_mic_header1(mic_header1, HeaderLen, pData); + + construct_mic_header2(mic_header2, pData, a4_exists, qc_exists); + + aes128k128d(pWpaKey[KeyID].Key, mic_iv, aes_out); + bitwise_xor(aes_out, mic_header1, chain_buffer); + aes128k128d(pWpaKey[KeyID].Key, chain_buffer, aes_out); + bitwise_xor(aes_out, mic_header2, chain_buffer); + aes128k128d(pWpaKey[KeyID].Key, chain_buffer, aes_out); + + /* iterate through each 16 byte payload block */ + for (i = 0; i < num_blocks; i++) { + bitwise_xor(aes_out, pData + payload_index, chain_buffer); + payload_index += 16; + aes128k128d(pWpaKey[KeyID].Key, chain_buffer, aes_out); + } + + /* Add on the final payload block if it needs padding */ + if (payload_remainder > 0) { + NdisZeroMemory(padded_buffer, 16); + NdisMoveMemory(padded_buffer, pData + payload_index, + payload_remainder); + + bitwise_xor(aes_out, padded_buffer, chain_buffer); + aes128k128d(pWpaKey[KeyID].Key, chain_buffer, aes_out); + } + /* aes_out contains padded mic, discard most significant */ + /* 8 bytes to generate 64 bit MIC */ + for (i = 0; i < 8; i++) + MIC[i] = aes_out[i]; + + if (!NdisEqualMemory(MIC, TrailMIC, 8)) { + DBGPRINT(RT_DEBUG_ERROR, ("RTMPSoftDecryptAES, MIC Error !\n")); /*MIC error. */ + return FALSE; + } + + return TRUE; +} + +/* ========================= AES En/Decryption ========================== */ +#ifndef uint8 +#define uint8 unsigned char +#endif + +#ifndef uint32 +#define uint32 unsigned int +#endif + +/* forward S-box */ +static uint32 FSb[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 +}; + +/* forward table */ +#define FT \ +\ + V(C6,63,63,A5), V(F8,7C,7C,84), V(EE,77,77,99), V(F6,7B,7B,8D), \ + V(FF,F2,F2,0D), V(D6,6B,6B,BD), V(DE,6F,6F,B1), V(91,C5,C5,54), \ + V(60,30,30,50), V(02,01,01,03), V(CE,67,67,A9), V(56,2B,2B,7D), \ + V(E7,FE,FE,19), V(B5,D7,D7,62), V(4D,AB,AB,E6), V(EC,76,76,9A), \ + V(8F,CA,CA,45), V(1F,82,82,9D), V(89,C9,C9,40), V(FA,7D,7D,87), \ + V(EF,FA,FA,15), V(B2,59,59,EB), V(8E,47,47,C9), V(FB,F0,F0,0B), \ + V(41,AD,AD,EC), V(B3,D4,D4,67), V(5F,A2,A2,FD), V(45,AF,AF,EA), \ + V(23,9C,9C,BF), V(53,A4,A4,F7), V(E4,72,72,96), V(9B,C0,C0,5B), \ + V(75,B7,B7,C2), V(E1,FD,FD,1C), V(3D,93,93,AE), V(4C,26,26,6A), \ + V(6C,36,36,5A), V(7E,3F,3F,41), V(F5,F7,F7,02), V(83,CC,CC,4F), \ + V(68,34,34,5C), V(51,A5,A5,F4), V(D1,E5,E5,34), V(F9,F1,F1,08), \ + V(E2,71,71,93), V(AB,D8,D8,73), V(62,31,31,53), V(2A,15,15,3F), \ + V(08,04,04,0C), V(95,C7,C7,52), V(46,23,23,65), V(9D,C3,C3,5E), \ + V(30,18,18,28), V(37,96,96,A1), V(0A,05,05,0F), V(2F,9A,9A,B5), \ + V(0E,07,07,09), V(24,12,12,36), V(1B,80,80,9B), V(DF,E2,E2,3D), \ + V(CD,EB,EB,26), V(4E,27,27,69), V(7F,B2,B2,CD), V(EA,75,75,9F), \ + V(12,09,09,1B), V(1D,83,83,9E), V(58,2C,2C,74), V(34,1A,1A,2E), \ + V(36,1B,1B,2D), V(DC,6E,6E,B2), V(B4,5A,5A,EE), V(5B,A0,A0,FB), \ + V(A4,52,52,F6), V(76,3B,3B,4D), V(B7,D6,D6,61), V(7D,B3,B3,CE), \ + V(52,29,29,7B), V(DD,E3,E3,3E), V(5E,2F,2F,71), V(13,84,84,97), \ + V(A6,53,53,F5), V(B9,D1,D1,68), V(00,00,00,00), V(C1,ED,ED,2C), \ + V(40,20,20,60), V(E3,FC,FC,1F), V(79,B1,B1,C8), V(B6,5B,5B,ED), \ + V(D4,6A,6A,BE), V(8D,CB,CB,46), V(67,BE,BE,D9), V(72,39,39,4B), \ + V(94,4A,4A,DE), V(98,4C,4C,D4), V(B0,58,58,E8), V(85,CF,CF,4A), \ + V(BB,D0,D0,6B), V(C5,EF,EF,2A), V(4F,AA,AA,E5), V(ED,FB,FB,16), \ + V(86,43,43,C5), V(9A,4D,4D,D7), V(66,33,33,55), V(11,85,85,94), \ + V(8A,45,45,CF), V(E9,F9,F9,10), V(04,02,02,06), V(FE,7F,7F,81), \ + V(A0,50,50,F0), V(78,3C,3C,44), V(25,9F,9F,BA), V(4B,A8,A8,E3), \ + V(A2,51,51,F3), V(5D,A3,A3,FE), V(80,40,40,C0), V(05,8F,8F,8A), \ + V(3F,92,92,AD), V(21,9D,9D,BC), V(70,38,38,48), V(F1,F5,F5,04), \ + V(63,BC,BC,DF), V(77,B6,B6,C1), V(AF,DA,DA,75), V(42,21,21,63), \ + V(20,10,10,30), V(E5,FF,FF,1A), V(FD,F3,F3,0E), V(BF,D2,D2,6D), \ + V(81,CD,CD,4C), V(18,0C,0C,14), V(26,13,13,35), V(C3,EC,EC,2F), \ + V(BE,5F,5F,E1), V(35,97,97,A2), V(88,44,44,CC), V(2E,17,17,39), \ + V(93,C4,C4,57), V(55,A7,A7,F2), V(FC,7E,7E,82), V(7A,3D,3D,47), \ + V(C8,64,64,AC), V(BA,5D,5D,E7), V(32,19,19,2B), V(E6,73,73,95), \ + V(C0,60,60,A0), V(19,81,81,98), V(9E,4F,4F,D1), V(A3,DC,DC,7F), \ + V(44,22,22,66), V(54,2A,2A,7E), V(3B,90,90,AB), V(0B,88,88,83), \ + V(8C,46,46,CA), V(C7,EE,EE,29), V(6B,B8,B8,D3), V(28,14,14,3C), \ + V(A7,DE,DE,79), V(BC,5E,5E,E2), V(16,0B,0B,1D), V(AD,DB,DB,76), \ + V(DB,E0,E0,3B), V(64,32,32,56), V(74,3A,3A,4E), V(14,0A,0A,1E), \ + V(92,49,49,DB), V(0C,06,06,0A), V(48,24,24,6C), V(B8,5C,5C,E4), \ + V(9F,C2,C2,5D), V(BD,D3,D3,6E), V(43,AC,AC,EF), V(C4,62,62,A6), \ + V(39,91,91,A8), V(31,95,95,A4), V(D3,E4,E4,37), V(F2,79,79,8B), \ + V(D5,E7,E7,32), V(8B,C8,C8,43), V(6E,37,37,59), V(DA,6D,6D,B7), \ + V(01,8D,8D,8C), V(B1,D5,D5,64), V(9C,4E,4E,D2), V(49,A9,A9,E0), \ + V(D8,6C,6C,B4), V(AC,56,56,FA), V(F3,F4,F4,07), V(CF,EA,EA,25), \ + V(CA,65,65,AF), V(F4,7A,7A,8E), V(47,AE,AE,E9), V(10,08,08,18), \ + V(6F,BA,BA,D5), V(F0,78,78,88), V(4A,25,25,6F), V(5C,2E,2E,72), \ + V(38,1C,1C,24), V(57,A6,A6,F1), V(73,B4,B4,C7), V(97,C6,C6,51), \ + V(CB,E8,E8,23), V(A1,DD,DD,7C), V(E8,74,74,9C), V(3E,1F,1F,21), \ + V(96,4B,4B,DD), V(61,BD,BD,DC), V(0D,8B,8B,86), V(0F,8A,8A,85), \ + V(E0,70,70,90), V(7C,3E,3E,42), V(71,B5,B5,C4), V(CC,66,66,AA), \ + V(90,48,48,D8), V(06,03,03,05), V(F7,F6,F6,01), V(1C,0E,0E,12), \ + V(C2,61,61,A3), V(6A,35,35,5F), V(AE,57,57,F9), V(69,B9,B9,D0), \ + V(17,86,86,91), V(99,C1,C1,58), V(3A,1D,1D,27), V(27,9E,9E,B9), \ + V(D9,E1,E1,38), V(EB,F8,F8,13), V(2B,98,98,B3), V(22,11,11,33), \ + V(D2,69,69,BB), V(A9,D9,D9,70), V(07,8E,8E,89), V(33,94,94,A7), \ + V(2D,9B,9B,B6), V(3C,1E,1E,22), V(15,87,87,92), V(C9,E9,E9,20), \ + V(87,CE,CE,49), V(AA,55,55,FF), V(50,28,28,78), V(A5,DF,DF,7A), \ + V(03,8C,8C,8F), V(59,A1,A1,F8), V(09,89,89,80), V(1A,0D,0D,17), \ + V(65,BF,BF,DA), V(D7,E6,E6,31), V(84,42,42,C6), V(D0,68,68,B8), \ + V(82,41,41,C3), V(29,99,99,B0), V(5A,2D,2D,77), V(1E,0F,0F,11), \ + V(7B,B0,B0,CB), V(A8,54,54,FC), V(6D,BB,BB,D6), V(2C,16,16,3A) + +#define V(a,b,c,d) 0x##a##b##c##d +static uint32 FT0[256] = { FT }; + +#undef V + +#define V(a,b,c,d) 0x##d##a##b##c +static uint32 FT1[256] = { FT }; + +#undef V + +#define V(a,b,c,d) 0x##c##d##a##b +static uint32 FT2[256] = { FT }; + +#undef V + +#define V(a,b,c,d) 0x##b##c##d##a +static uint32 FT3[256] = { FT }; + +#undef V + +#undef FT + +/* reverse S-box */ + +static uint32 RSb[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 +}; + +/* reverse table */ + +#define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define V(a,b,c,d) 0x##a##b##c##d +static uint32 RT0[256] = { RT }; + +#undef V + +#define V(a,b,c,d) 0x##d##a##b##c +static uint32 RT1[256] = { RT }; + +#undef V + +#define V(a,b,c,d) 0x##c##d##a##b +static uint32 RT2[256] = { RT }; + +#undef V + +#define V(a,b,c,d) 0x##b##c##d##a +static uint32 RT3[256] = { RT }; + +#undef V + +#undef RT + +/* round constants */ + +static uint32 RCON[10] = { + 0x01000000, 0x02000000, 0x04000000, 0x08000000, + 0x10000000, 0x20000000, 0x40000000, 0x80000000, + 0x1B000000, 0x36000000 +}; + +/* key schedule tables */ + +static int KT_init = 1; + +static uint32 KT0[256]; +static uint32 KT1[256]; +static uint32 KT2[256]; +static uint32 KT3[256]; + +/* platform-independant 32-bit integer manipulation macros */ + +#define GET_UINT32(n,b,i) \ +{ \ + (n) = ( (uint32) (b)[(i) ] << 24 ) \ + | ( (uint32) (b)[(i) + 1] << 16 ) \ + | ( (uint32) (b)[(i) + 2] << 8 ) \ + | ( (uint32) (b)[(i) + 3] ); \ +} + +#define PUT_UINT32(n,b,i) \ +{ \ + (b)[(i) ] = (uint8) ( (n) >> 24 ); \ + (b)[(i) + 1] = (uint8) ( (n) >> 16 ); \ + (b)[(i) + 2] = (uint8) ( (n) >> 8 ); \ + (b)[(i) + 3] = (uint8) ( (n) ); \ +} + +int rt_aes_set_key(struct aes_context * ctx, uint8 * key, int nbits) +{ + int i; + uint32 *RK, *SK; + + switch (nbits) { + case 128: + ctx->nr = 10; + break; + case 192: + ctx->nr = 12; + break; + case 256: + ctx->nr = 14; + break; + default: + return (1); + } + + RK = (uint32 *) ctx->erk; + + for (i = 0; i < (nbits >> 5); i++) { + GET_UINT32(RK[i], key, i * 4); + } + + /* setup encryption round keys */ + + switch (nbits) { + case 128: + + for (i = 0; i < 10; i++, RK += 4) { + RK[4] = RK[0] ^ RCON[i] ^ + (FSb[(uint8) (RK[3] >> 16)] << 24) ^ + (FSb[(uint8) (RK[3] >> 8)] << 16) ^ + (FSb[(uint8) (RK[3])] << 8) ^ + (FSb[(uint8) (RK[3] >> 24)]); + + RK[5] = RK[1] ^ RK[4]; + RK[6] = RK[2] ^ RK[5]; + RK[7] = RK[3] ^ RK[6]; + } + break; + + case 192: + + for (i = 0; i < 8; i++, RK += 6) { + RK[6] = RK[0] ^ RCON[i] ^ + (FSb[(uint8) (RK[5] >> 16)] << 24) ^ + (FSb[(uint8) (RK[5] >> 8)] << 16) ^ + (FSb[(uint8) (RK[5])] << 8) ^ + (FSb[(uint8) (RK[5] >> 24)]); + + RK[7] = RK[1] ^ RK[6]; + RK[8] = RK[2] ^ RK[7]; + RK[9] = RK[3] ^ RK[8]; + RK[10] = RK[4] ^ RK[9]; + RK[11] = RK[5] ^ RK[10]; + } + break; + + case 256: + + for (i = 0; i < 7; i++, RK += 8) { + RK[8] = RK[0] ^ RCON[i] ^ + (FSb[(uint8) (RK[7] >> 16)] << 24) ^ + (FSb[(uint8) (RK[7] >> 8)] << 16) ^ + (FSb[(uint8) (RK[7])] << 8) ^ + (FSb[(uint8) (RK[7] >> 24)]); + + RK[9] = RK[1] ^ RK[8]; + RK[10] = RK[2] ^ RK[9]; + RK[11] = RK[3] ^ RK[10]; + + RK[12] = RK[4] ^ + (FSb[(uint8) (RK[11] >> 24)] << 24) ^ + (FSb[(uint8) (RK[11] >> 16)] << 16) ^ + (FSb[(uint8) (RK[11] >> 8)] << 8) ^ + (FSb[(uint8) (RK[11])]); + + RK[13] = RK[5] ^ RK[12]; + RK[14] = RK[6] ^ RK[13]; + RK[15] = RK[7] ^ RK[14]; + } + break; + } + + /* setup decryption round keys */ + + if (KT_init) { + for (i = 0; i < 256; i++) { + KT0[i] = RT0[FSb[i]]; + KT1[i] = RT1[FSb[i]]; + KT2[i] = RT2[FSb[i]]; + KT3[i] = RT3[FSb[i]]; + } + + KT_init = 0; + } + + SK = (uint32 *) ctx->drk; + + *SK++ = *RK++; + *SK++ = *RK++; + *SK++ = *RK++; + *SK++ = *RK++; + + for (i = 1; i < ctx->nr; i++) { + RK -= 8; + + *SK++ = KT0[(uint8) (*RK >> 24)] ^ + KT1[(uint8) (*RK >> 16)] ^ + KT2[(uint8) (*RK >> 8)] ^ KT3[(uint8) (*RK)]; + RK++; + + *SK++ = KT0[(uint8) (*RK >> 24)] ^ + KT1[(uint8) (*RK >> 16)] ^ + KT2[(uint8) (*RK >> 8)] ^ KT3[(uint8) (*RK)]; + RK++; + + *SK++ = KT0[(uint8) (*RK >> 24)] ^ + KT1[(uint8) (*RK >> 16)] ^ + KT2[(uint8) (*RK >> 8)] ^ KT3[(uint8) (*RK)]; + RK++; + + *SK++ = KT0[(uint8) (*RK >> 24)] ^ + KT1[(uint8) (*RK >> 16)] ^ + KT2[(uint8) (*RK >> 8)] ^ KT3[(uint8) (*RK)]; + RK++; + } + + RK -= 8; + + *SK++ = *RK++; + *SK++ = *RK++; + *SK++ = *RK++; + *SK++ = *RK++; + + return (0); +} + +/* AES 128-bit block encryption routine */ + +void rt_aes_encrypt(struct aes_context * ctx, uint8 input[16], uint8 output[16]) +{ + uint32 *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3; + + RK = (uint32 *) ctx->erk; + GET_UINT32(X0, input, 0); + X0 ^= RK[0]; + GET_UINT32(X1, input, 4); + X1 ^= RK[1]; + GET_UINT32(X2, input, 8); + X2 ^= RK[2]; + GET_UINT32(X3, input, 12); + X3 ^= RK[3]; + +#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \ +{ \ + RK += 4; \ + \ + X0 = RK[0] ^ FT0[ (uint8) ( Y0 >> 24 ) ] ^ \ + FT1[ (uint8) ( Y1 >> 16 ) ] ^ \ + FT2[ (uint8) ( Y2 >> 8 ) ] ^ \ + FT3[ (uint8) ( Y3 ) ]; \ + \ + X1 = RK[1] ^ FT0[ (uint8) ( Y1 >> 24 ) ] ^ \ + FT1[ (uint8) ( Y2 >> 16 ) ] ^ \ + FT2[ (uint8) ( Y3 >> 8 ) ] ^ \ + FT3[ (uint8) ( Y0 ) ]; \ + \ + X2 = RK[2] ^ FT0[ (uint8) ( Y2 >> 24 ) ] ^ \ + FT1[ (uint8) ( Y3 >> 16 ) ] ^ \ + FT2[ (uint8) ( Y0 >> 8 ) ] ^ \ + FT3[ (uint8) ( Y1 ) ]; \ + \ + X3 = RK[3] ^ FT0[ (uint8) ( Y3 >> 24 ) ] ^ \ + FT1[ (uint8) ( Y0 >> 16 ) ] ^ \ + FT2[ (uint8) ( Y1 >> 8 ) ] ^ \ + FT3[ (uint8) ( Y2 ) ]; \ +} + + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 1 */ + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 2 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 3 */ + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 4 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 5 */ + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 6 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 7 */ + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 8 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 9 */ + + if (ctx->nr > 10) { + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 10 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 11 */ + } + + if (ctx->nr > 12) { + AES_FROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 12 */ + AES_FROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 13 */ + } + + /* last round */ + + RK += 4; + + X0 = RK[0] ^ (FSb[(uint8) (Y0 >> 24)] << 24) ^ + (FSb[(uint8) (Y1 >> 16)] << 16) ^ + (FSb[(uint8) (Y2 >> 8)] << 8) ^ (FSb[(uint8) (Y3)]); + + X1 = RK[1] ^ (FSb[(uint8) (Y1 >> 24)] << 24) ^ + (FSb[(uint8) (Y2 >> 16)] << 16) ^ + (FSb[(uint8) (Y3 >> 8)] << 8) ^ (FSb[(uint8) (Y0)]); + + X2 = RK[2] ^ (FSb[(uint8) (Y2 >> 24)] << 24) ^ + (FSb[(uint8) (Y3 >> 16)] << 16) ^ + (FSb[(uint8) (Y0 >> 8)] << 8) ^ (FSb[(uint8) (Y1)]); + + X3 = RK[3] ^ (FSb[(uint8) (Y3 >> 24)] << 24) ^ + (FSb[(uint8) (Y0 >> 16)] << 16) ^ + (FSb[(uint8) (Y1 >> 8)] << 8) ^ (FSb[(uint8) (Y2)]); + + PUT_UINT32(X0, output, 0); + PUT_UINT32(X1, output, 4); + PUT_UINT32(X2, output, 8); + PUT_UINT32(X3, output, 12); +} + +/* AES 128-bit block decryption routine */ + +void rt_aes_decrypt(struct aes_context * ctx, uint8 input[16], uint8 output[16]) +{ + uint32 *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3; + + RK = (uint32 *) ctx->drk; + + GET_UINT32(X0, input, 0); + X0 ^= RK[0]; + GET_UINT32(X1, input, 4); + X1 ^= RK[1]; + GET_UINT32(X2, input, 8); + X2 ^= RK[2]; + GET_UINT32(X3, input, 12); + X3 ^= RK[3]; + +#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3) \ +{ \ + RK += 4; \ + \ + X0 = RK[0] ^ RT0[ (uint8) ( Y0 >> 24 ) ] ^ \ + RT1[ (uint8) ( Y3 >> 16 ) ] ^ \ + RT2[ (uint8) ( Y2 >> 8 ) ] ^ \ + RT3[ (uint8) ( Y1 ) ]; \ + \ + X1 = RK[1] ^ RT0[ (uint8) ( Y1 >> 24 ) ] ^ \ + RT1[ (uint8) ( Y0 >> 16 ) ] ^ \ + RT2[ (uint8) ( Y3 >> 8 ) ] ^ \ + RT3[ (uint8) ( Y2 ) ]; \ + \ + X2 = RK[2] ^ RT0[ (uint8) ( Y2 >> 24 ) ] ^ \ + RT1[ (uint8) ( Y1 >> 16 ) ] ^ \ + RT2[ (uint8) ( Y0 >> 8 ) ] ^ \ + RT3[ (uint8) ( Y3 ) ]; \ + \ + X3 = RK[3] ^ RT0[ (uint8) ( Y3 >> 24 ) ] ^ \ + RT1[ (uint8) ( Y2 >> 16 ) ] ^ \ + RT2[ (uint8) ( Y1 >> 8 ) ] ^ \ + RT3[ (uint8) ( Y0 ) ]; \ +} + + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 1 */ + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 2 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 3 */ + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 4 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 5 */ + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 6 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 7 */ + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 8 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 9 */ + + if (ctx->nr > 10) { + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 10 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 11 */ + } + + if (ctx->nr > 12) { + AES_RROUND(X0, X1, X2, X3, Y0, Y1, Y2, Y3); /* round 12 */ + AES_RROUND(Y0, Y1, Y2, Y3, X0, X1, X2, X3); /* round 13 */ + } + + /* last round */ + + RK += 4; + + X0 = RK[0] ^ (RSb[(uint8) (Y0 >> 24)] << 24) ^ + (RSb[(uint8) (Y3 >> 16)] << 16) ^ + (RSb[(uint8) (Y2 >> 8)] << 8) ^ (RSb[(uint8) (Y1)]); + + X1 = RK[1] ^ (RSb[(uint8) (Y1 >> 24)] << 24) ^ + (RSb[(uint8) (Y0 >> 16)] << 16) ^ + (RSb[(uint8) (Y3 >> 8)] << 8) ^ (RSb[(uint8) (Y2)]); + + X2 = RK[2] ^ (RSb[(uint8) (Y2 >> 24)] << 24) ^ + (RSb[(uint8) (Y1 >> 16)] << 16) ^ + (RSb[(uint8) (Y0 >> 8)] << 8) ^ (RSb[(uint8) (Y3)]); + + X3 = RK[3] ^ (RSb[(uint8) (Y3 >> 24)] << 24) ^ + (RSb[(uint8) (Y2 >> 16)] << 16) ^ + (RSb[(uint8) (Y1 >> 8)] << 8) ^ (RSb[(uint8) (Y0)]); + + PUT_UINT32(X0, output, 0); + PUT_UINT32(X1, output, 4); + PUT_UINT32(X2, output, 8); + PUT_UINT32(X3, output, 12); +} + +/* + ========================================================================== + Description: + ENCRYPT AES GTK before sending in EAPOL frame. + AES GTK length = 128 bit, so fix blocks for aes-key-wrap as 2 in this function. + This function references to RFC 3394 for aes key wrap algorithm. + Return: + ========================================================================== +*/ +void AES_GTK_KEY_WRAP(u8 * key, + u8 * plaintext, + u32 p_len, u8 * ciphertext) +{ + u8 A[8], BIN[16], BOUT[16]; + u8 R[512]; + int num_blocks = p_len / 8; /* unit:64bits */ + int i, j; + struct aes_context aesctx; + u8 xor; + + rt_aes_set_key(&aesctx, key, 128); + + /* Init IA */ + for (i = 0; i < 8; i++) + A[i] = 0xa6; + + /*Input plaintext */ + for (i = 0; i < num_blocks; i++) { + for (j = 0; j < 8; j++) + R[8 * (i + 1) + j] = plaintext[8 * i + j]; + } + + /* Key Mix */ + for (j = 0; j < 6; j++) { + for (i = 1; i <= num_blocks; i++) { + /*phase 1 */ + NdisMoveMemory(BIN, A, 8); + NdisMoveMemory(&BIN[8], &R[8 * i], 8); + rt_aes_encrypt(&aesctx, BIN, BOUT); + + NdisMoveMemory(A, &BOUT[0], 8); + xor = num_blocks * j + i; + A[7] = BOUT[7] ^ xor; + NdisMoveMemory(&R[8 * i], &BOUT[8], 8); + } + } + + /* Output ciphertext */ + NdisMoveMemory(ciphertext, A, 8); + + for (i = 1; i <= num_blocks; i++) { + for (j = 0; j < 8; j++) + ciphertext[8 * i + j] = R[8 * i + j]; + } +} + +/* + ======================================================================== + + Routine Description: + Misc function to decrypt AES body + + Arguments: + + Return Value: + + Note: + This function references to RFC 3394 for aes key unwrap algorithm. + + ======================================================================== +*/ +void AES_GTK_KEY_UNWRAP(u8 * key, + u8 * plaintext, + u32 c_len, u8 * ciphertext) +{ + u8 A[8], BIN[16], BOUT[16]; + u8 xor; + int i, j; + struct aes_context aesctx; + u8 *R; + int num_blocks = c_len / 8; /* unit:64bits */ + + os_alloc_mem(NULL, (u8 **) & R, 512); + + if (R == NULL) { + DBGPRINT(RT_DEBUG_ERROR, + ("AES_GTK_KEY_UNWRAP: no memory!\n")); + return; + } + /* End of if */ + /* Initialize */ + NdisMoveMemory(A, ciphertext, 8); + /*Input plaintext */ + for (i = 0; i < (c_len - 8); i++) { + R[i] = ciphertext[i + 8]; + } + + rt_aes_set_key(&aesctx, key, 128); + + for (j = 5; j >= 0; j--) { + for (i = (num_blocks - 1); i > 0; i--) { + xor = (num_blocks - 1) * j + i; + NdisMoveMemory(BIN, A, 8); + BIN[7] = A[7] ^ xor; + NdisMoveMemory(&BIN[8], &R[(i - 1) * 8], 8); + rt_aes_decrypt(&aesctx, BIN, BOUT); + NdisMoveMemory(A, &BOUT[0], 8); + NdisMoveMemory(&R[(i - 1) * 8], &BOUT[8], 8); + } + } + + /* OUTPUT */ + for (i = 0; i < c_len; i++) { + plaintext[i] = R[i]; + } + + os_free_mem(NULL, R); +} |