From 85626c40a84189c87a742005dc6aa7c6125e1c8a Mon Sep 17 00:00:00 2001 From: Mark Qvist Date: Mon, 4 Feb 2019 22:30:52 +0100 Subject: [PATCH] AES crypto driver --- Makefile | 4 +- hardware/Crypto.c | 66 ++++++++ hardware/Crypto.h | 14 ++ hardware/crypto/AES.c | 361 ++++++++++++++++++++++++++++++++++++++++++ hardware/crypto/AES.h | 74 +++++++++ main.c | 2 + 6 files changed, 518 insertions(+), 3 deletions(-) create mode 100644 hardware/Crypto.c create mode 100644 hardware/Crypto.h create mode 100755 hardware/crypto/AES.c create mode 100755 hardware/crypto/AES.h diff --git a/Makefile b/Makefile index edfccdb..b67b2d2 100755 --- a/Makefile +++ b/Makefile @@ -6,7 +6,7 @@ TARGET = images/OpenModem OPT = s FORMAT = ihex -SRC = main.c hardware/Serial.c hardware/AFSK.c hardware/VREF.c hardware/LED.c hardware/UserIO.c hardware/SD.c hardware/sdcard/diskio.c hardware/sdcard/ff.c hardware/sdcard/ffsystem.c hardware/sdcard/ffunicode.c hardware/Bluetooth.c hardware/GPS.c util/CRC-CCIT.c protocol/AX25.c protocol/KISS.c +SRC = main.c hardware/Serial.c hardware/AFSK.c hardware/VREF.c hardware/LED.c hardware/UserIO.c hardware/SD.c hardware/sdcard/diskio.c hardware/sdcard/ff.c hardware/sdcard/ffsystem.c hardware/sdcard/ffunicode.c hardware/Bluetooth.c hardware/GPS.c hardware/Crypto.c hardware/crypto/AES.c util/CRC-CCIT.c protocol/AX25.c protocol/KISS.c # List Assembler source files here. @@ -30,8 +30,6 @@ $(patsubst %,-I%,$(EXTRAINCDIRS)) CFLAGS += -std=gnu99 - - # Optional assembler flags. ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs diff --git a/hardware/Crypto.c b/hardware/Crypto.c new file mode 100644 index 0000000..faaaad2 --- /dev/null +++ b/hardware/Crypto.c @@ -0,0 +1,66 @@ +#include "Crypto.h" + +uint8_t active_key[16]; +uint8_t active_iv[16]; + +aes_128_context_t context; +uint8_t current_vector[16]; + +void crypto_init(void) { + crypto_test(); + return; +} + +void crypto_prepare(uint8_t key[16], uint8_t initialization_vector[16]) { + // Initialise the context with the key + aes_128_init(&context, key); + + // Copy the IV into the current vector array + memcpy(current_vector, initialization_vector, 16); +} + +void crypto_encrypt_block(uint8_t block[16]) { + int i; + + // XOR the current vector with the block before encrypting + for (i = 0; i < 16; i++) { + block[i] ^= current_vector[i]; + } + + // Encrypt the block + aes_128_encrypt(&context, block); + + // Copy the cipher output to the current vector + memcpy(current_vector, block, 16); +} + +void crypto_decrypt_block(uint8_t block[16]) { + uint8_t temp_vector[16]; + int i; + + // Copy the cipher output to the temporary vector + memcpy(temp_vector, block, 16); + + // Decrypt the block + aes_128_decrypt(&context, block); + + // XOR the output with the current vector to fully decrypt + for (i = 0; i < 16; i++) { + block[i] ^= current_vector[i]; + } + + // Copy the temporary vector to the current vector + memcpy(current_vector, temp_vector, 16); +} + +void load_key(void) { + // TODO: implement +} + +void generate_iv(void) { + // TODO: implement +} + +void crypto_test(void) { + +} \ No newline at end of file diff --git a/hardware/Crypto.h b/hardware/Crypto.h new file mode 100644 index 0000000..afdc4bb --- /dev/null +++ b/hardware/Crypto.h @@ -0,0 +1,14 @@ +#ifndef CRYPTO_H +#define CRYPTO_H + +#include +#include +#include +#include +#include "crypto/aes.h" + +void crypto_init(void); +void crypto_test(void); + +#endif + diff --git a/hardware/crypto/AES.c b/hardware/crypto/AES.c new file mode 100755 index 0000000..7764433 --- /dev/null +++ b/hardware/crypto/AES.c @@ -0,0 +1,361 @@ +/* +MIT License + +Copyright (c) 2016 Andrew Carter + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + +Modifications copyright 2019 Mark Qvist + +*/ + +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wparentheses" + +#include +#include +#include + +#include "AES.h" + +// Preprocessor Definitions +#define MAP(i,j) (((j) << 2) + (i)) +#define MUL(x,y) aes_GaloisFieldMultiply((x),(y)) +#define MUL2(x) (((x) << 1) ^ (0x1B & (((x) >> 7) * 0xFF))) & 0xFF +#define MUL3(x) ((x) ^ MUL2(x)) +#define SUB4(x) (((uint32_t)pgm_read_byte(&(s_box[((x) & 0xFF000000) >> 24])) << 24) | ((uint32_t)pgm_read_byte(&(s_box[((x) & 0xFF0000) >> 16])) << 16) | (pgm_read_byte(&(s_box[((x) & 0xFF00) >> 8])) << 8) | pgm_read_byte(&(s_box[((x) & 0xFF)]))) + +// AES Tables +const uint8_t s_box[256] PROGMEM = { + 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 +}; + +const uint8_t s_box_inverse[256] PROGMEM = { + 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 +}; + +const uint8_t rcon[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36 }; + +// AES Operation Definitions + +void aes_Rotate (uint8_t block[4]); +void aes_SubBytes (uint8_t state[16]); +void aes_InvSubBytes (uint8_t state[16]); +void aes_ShiftRows (uint8_t state[16]); +void aes_InvShiftRows (uint8_t state[16]); +void aes_MixColumns (uint8_t state[16]); +void aes_InvMixColumns (uint8_t state[16]); +void aes_AddRoundKey (uint8_t state[16], uint8_t sub_key[16]); + +// Maths Operation Definitions + +uint8_t aes_GaloisFieldMultiply (uint8_t fixed, uint8_t variable); + +// AES Core Procedures + +void aes_init(uint32_t *round_key, counter b, uint32_t *key, counter n) +{ + uint32_t t; + counter i, position, cycle; + + memcpy(round_key, key, n * sizeof(uint32_t)); + + for (position = n, cycle = n, t = round_key[n - 1], i = 0; position < b; position++, cycle++) { + if (cycle == n) { + cycle = 0; + + aes_Rotate((uint8_t *) &t); + t = SUB4(t); + ((uint8_t *) &t)[0] ^= rcon[i++]; + } else if (cycle == 4 && n == 8) { + t = SUB4(t); + } + + t ^= round_key[position - n]; + round_key[position] = t; + } +} + +void aes_encrypt(uint8_t *round_key, uint8_t block[16], counter rounds) +{ + counter i; + + aes_AddRoundKey(block, round_key); + + for (i = 1; i < rounds; i++) { + aes_SubBytes(block); + aes_ShiftRows(block); + aes_MixColumns(block); + aes_AddRoundKey(block, round_key + (i << 4)); + } + + aes_SubBytes(block); + aes_ShiftRows(block); + aes_AddRoundKey(block, round_key + (i << 4)); +} + +void aes_decrypt(uint8_t *round_key, uint8_t block[16], counter rounds) +{ + counter i; + + aes_AddRoundKey(block, round_key + (rounds << 4)); + + for (i = 1; i < rounds; i++) { + aes_InvShiftRows(block); + aes_InvSubBytes(block); + aes_AddRoundKey(block, round_key + ((rounds - i) << 4)); + aes_InvMixColumns(block); + } + + aes_InvShiftRows(block); + aes_InvSubBytes(block); + aes_AddRoundKey(block, round_key); +} + +// AES Key Specific API + +void aes_256_init(aes_256_context_t *context, uint8_t key[32]) +{ + aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 8); +} + +void aes_256_encrypt(aes_256_context_t *context, uint8_t block[16]) +{ + aes_encrypt(context->round_key, block, AES_256_ROUNDS); +} + +void aes_256_decrypt(aes_256_context_t *context, uint8_t block[16]) +{ + aes_decrypt(context->round_key, block, AES_256_ROUNDS); +} + +void aes_192_init(aes_192_context_t *context, uint8_t key[24]) +{ + aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 6); +} + +void aes_192_encrypt(aes_192_context_t *context, uint8_t block[16]) +{ + aes_encrypt(context->round_key, block, AES_192_ROUNDS); +} + +void aes_192_decrypt(aes_192_context_t *context, uint8_t block[16]) +{ + aes_decrypt(context->round_key, block, AES_192_ROUNDS); +} + +void aes_128_init(aes_128_context_t *context, uint8_t key[16]) +{ + aes_init((uint32_t *) context->round_key, sizeof(context->round_key) / sizeof(uint32_t), (uint32_t *) key, 4); +} + +void aes_128_encrypt(aes_128_context_t *context, uint8_t block[16]) +{ + aes_encrypt(context->round_key, block, AES_128_ROUNDS); +} + +void aes_128_decrypt(aes_128_context_t *context, uint8_t block[16]) +{ + aes_decrypt(context->round_key, block, AES_128_ROUNDS); +} + +// AES Operation Implementations + +void aes_Rotate(uint8_t block[4]) +{ + uint8_t tmp; + + tmp = block[0]; + block[0] = block[1]; + block[1] = block[2]; + block[2] = block[3]; + block[3] = tmp; +} + +void aes_SubBytes(uint8_t state[16]) +{ + counter i = 16; + + while (i--) { + state[i] = pgm_read_byte(&(s_box[state[i]])); + } +} + +void aes_InvSubBytes(uint8_t state[16]) +{ + counter i = 16; + + while (i--) { + state[i] = pgm_read_byte(&(s_box_inverse[state[i]])); + } +} + +void aes_ShiftRows(uint8_t state[16]) +{ + uint8_t tmp; + + tmp = state[MAP(1,0)]; + state[MAP(1,0)] = state[MAP(1,1)]; + state[MAP(1,1)] = state[MAP(1,2)]; + state[MAP(1,2)] = state[MAP(1,3)]; + state[MAP(1,3)] = tmp; + + tmp = state[MAP(2,0)]; + state[MAP(2,0)] = state[MAP(2,2)]; + state[MAP(2,2)] = tmp; + + tmp = state[MAP(2,1)]; + state[MAP(2,1)] = state[MAP(2,3)]; + state[MAP(2,3)] = tmp; + + tmp = state[MAP(3,0)]; + state[MAP(3,0)] = state[MAP(3,3)]; + state[MAP(3,3)] = state[MAP(3,2)]; + state[MAP(3,2)] = state[MAP(3,1)]; + state[MAP(3,1)] = tmp; +} + +void aes_InvShiftRows(uint8_t state[16]) +{ + uint8_t tmp; + + tmp = state[MAP(3,0)]; + state[MAP(3,0)] = state[MAP(3,1)]; + state[MAP(3,1)] = state[MAP(3,2)]; + state[MAP(3,2)] = state[MAP(3,3)]; + state[MAP(3,3)] = tmp; + + tmp = state[MAP(2,0)]; + state[MAP(2,0)] = state[MAP(2,2)]; + state[MAP(2,2)] = tmp; + + tmp = state[MAP(2,1)]; + state[MAP(2,1)] = state[MAP(2,3)]; + state[MAP(2,3)] = tmp; + + tmp = state[MAP(1,0)]; + state[MAP(1,0)] = state[MAP(1,3)]; + state[MAP(1,3)] = state[MAP(1,2)]; + state[MAP(1,2)] = state[MAP(1,1)]; + state[MAP(1,1)] = tmp; +} + +void aes_MixColumns(uint8_t state[16]) +{ + counter i = 4; + uint8_t new_state[4]; + + while (i--) { + new_state[0] = MUL2(state[MAP(0,i)]) ^ MUL3(state[MAP(1,i)]) ^ state[MAP(2,i)] ^ state[MAP(3,i)] ; + new_state[1] = state[MAP(0,i)] ^ MUL2(state[MAP(1,i)]) ^ MUL3(state[MAP(2,i)]) ^ state[MAP(3,i)] ; + new_state[2] = state[MAP(0,i)] ^ state[MAP(1,i)] ^ MUL2(state[MAP(2,i)]) ^ MUL3(state[MAP(3,i)]); + new_state[3] = MUL3(state[MAP(0,i)]) ^ state[MAP(1,i)] ^ state[MAP(2,i)] ^ MUL2(state[MAP(3,i)]); + + state[MAP(0,i)] = new_state[0]; + state[MAP(1,i)] = new_state[1]; + state[MAP(2,i)] = new_state[2]; + state[MAP(3,i)] = new_state[3]; + } +} + +void aes_InvMixColumns(uint8_t state[16]) +{ + counter i = 4; + uint8_t new_state[4]; + + while (i--) { + new_state[0] = MUL(14, state[MAP(0,i)]) ^ MUL(11, state[MAP(1,i)]) ^ MUL(13, state[MAP(2,i)]) ^ MUL( 9, state[MAP(3,i)]); + new_state[1] = MUL( 9, state[MAP(0,i)]) ^ MUL(14, state[MAP(1,i)]) ^ MUL(11, state[MAP(2,i)]) ^ MUL(13, state[MAP(3,i)]); + new_state[2] = MUL(13, state[MAP(0,i)]) ^ MUL( 9, state[MAP(1,i)]) ^ MUL(14, state[MAP(2,i)]) ^ MUL(11, state[MAP(3,i)]); + new_state[3] = MUL(11, state[MAP(0,i)]) ^ MUL(13, state[MAP(1,i)]) ^ MUL( 9, state[MAP(2,i)]) ^ MUL(14, state[MAP(3,i)]); + + state[MAP(0,i)] = new_state[0]; + state[MAP(1,i)] = new_state[1]; + state[MAP(2,i)] = new_state[2]; + state[MAP(3,i)] = new_state[3]; + } +} + +void aes_AddRoundKey(uint8_t state[16], uint8_t sub_key[16]) +{ +#ifdef OPTIMISE_8_BIT + + counter i = 16; + + while (i--) { + state[i] ^= sub_key[i]; + } + +#else + + counter i = 4; + + while (i--) { + ((uint32_t *) state)[i] ^= ((uint32_t *) sub_key)[i]; + } + +#endif +} + +// Maths Operation Implementations + +uint8_t aes_GaloisFieldMultiply(uint8_t fixed, uint8_t variable) +{ + uint8_t result = 0; + + while (fixed) { + result ^= variable & ((fixed & 0x01) * 0xFF); + variable = MUL2(variable); + fixed >>= 1; + } + + return result; +} + +#pragma GCC diagnostic pop \ No newline at end of file diff --git a/hardware/crypto/AES.h b/hardware/crypto/AES.h new file mode 100755 index 0000000..31ea886 --- /dev/null +++ b/hardware/crypto/AES.h @@ -0,0 +1,74 @@ +/* +MIT License + +Copyright (c) 2016 Andrew Carter + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +*/ + +#ifndef AES_H +#define AES_H + +#include + +#define AES_256_ROUNDS 14 +#define AES_192_ROUNDS 12 +#define AES_128_ROUNDS 10 + +// Uncomment this (or compile with -DOPT_8_BIT) to optimise for an 8 bit architecture +#define AES_OPT_8_BIT + +#ifdef AES_OPT_8_BIT + typedef uint8_t counter; +#else + typedef unsigned int counter; +#endif + +// AES-256 + +typedef struct aes_256_context_t_ { + uint8_t round_key[(AES_256_ROUNDS + 1) * 16]; +} aes_256_context_t; + +void aes_256_init (aes_256_context_t *context, uint8_t key[32]); +void aes_256_encrypt (aes_256_context_t *context, uint8_t block[16]); +void aes_256_decrypt (aes_256_context_t *context, uint8_t block[16]); + +// AES-192 + +typedef struct aes_192_context_t_ { + uint8_t round_key[(AES_192_ROUNDS + 1) * 16]; +} aes_192_context_t; + +void aes_192_init (aes_192_context_t *context, uint8_t key[24]); +void aes_192_encrypt (aes_192_context_t *context, uint8_t block[16]); +void aes_192_decrypt (aes_192_context_t *context, uint8_t block[16]); + +// AES-128 + +typedef struct aes_128_context_t_ { + uint8_t round_key[(AES_128_ROUNDS + 1) * 16]; +} aes_128_context_t; + +void aes_128_init (aes_128_context_t *context, uint8_t key[16]); +void aes_128_encrypt (aes_128_context_t *context, uint8_t block[16]); +void aes_128_decrypt (aes_128_context_t *context, uint8_t block[16]); + +#endif + diff --git a/main.c b/main.c index f066434..a92adc6 100755 --- a/main.c +++ b/main.c @@ -13,6 +13,7 @@ #include "hardware/LED.h" #include "hardware/UserIO.h" #include "hardware/SD.h" +#include "hardware/Crypto.h" #include "hardware/Bluetooth.h" #include "hardware/GPS.h" #include "protocol/AX25.h" @@ -69,6 +70,7 @@ void init(void) { ax25_init(&AX25, &modem, &modem.fd, ax25_callback); kiss_init(&AX25, &modem, &serial); sd_init(); + crypto_init(); bluetooth_init(); gps_init(&serial); usrio_init();