sforkowany z mirror/meshtastic-firmware
use a tiny software AES lib if user needs AES-256
Thomas Göttgens
rodzic
d640478289
commit
76e48178c8
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@ -1,7 +1,7 @@
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#include "configuration.h"
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#include "CryptoEngine.h"
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#include <Adafruit_nRFCrypto.h>
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#include "aes-256/tiny-aes.h"
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class NRF52CryptoEngine : public CryptoEngine
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{
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public:
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@ -18,7 +18,12 @@ class NRF52CryptoEngine : public CryptoEngine
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{
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// DEBUG_MSG("NRF52 encrypt!\n");
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if (key.length > 0) {
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if (key.length > 16) {
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AES_ctx ctx;
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initNonce(fromNode, packetId);
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AES_init_ctx_iv(&ctx, key.bytes, nonce);
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AES_CTR_xcrypt_buffer(&ctx, bytes, numBytes);
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} else if (key.length > 0) {
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nRFCrypto.begin();
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nRFCrypto_AES ctx;
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uint8_t myLen = ctx.blockLen(numBytes);
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@ -36,7 +41,12 @@ class NRF52CryptoEngine : public CryptoEngine
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{
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// DEBUG_MSG("NRF52 decrypt!\n");
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if (key.length > 0) {
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if (key.length > 16) {
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AES_ctx ctx;
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initNonce(fromNode, packetId);
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AES_init_ctx_iv(&ctx, key.bytes, nonce);
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AES_CTR_xcrypt_buffer(&ctx, bytes, numBytes);
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} else if (key.length > 0) {
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nRFCrypto.begin();
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nRFCrypto_AES ctx;
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uint8_t myLen = ctx.blockLen(numBytes);
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@ -0,0 +1,239 @@
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/*
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AES-256 Software Implementation
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based on https://github.com/kokke/tiny-AES-C/ which is in public domain
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NOTE: String length must be evenly divisible by 16byte (str_len % 16 == 0)
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You should pad the end of the string with zeros if this is not the case.
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For AES192/256 the key size is proportionally larger.
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*/
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#include <string.h>
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#include "tiny-aes.h"
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#define Nb 4
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#define Nk 8
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#define Nr 14
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typedef uint8_t state_t[4][4];
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static const uint8_t sbox[256] = {
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//0 1 2 3 4 5 6 7 8 9 A B C D E F
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 };
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static const uint8_t Rcon[11] = {
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0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 };
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#define getSBoxValue(num) (sbox[(num)])
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static void KeyExpansion(uint8_t* RoundKey, const uint8_t* Key)
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{
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unsigned i, j, k;
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uint8_t tempa[4];
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for (i = 0; i < Nk; ++i)
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{
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RoundKey[(i * 4) + 0] = Key[(i * 4) + 0];
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RoundKey[(i * 4) + 1] = Key[(i * 4) + 1];
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RoundKey[(i * 4) + 2] = Key[(i * 4) + 2];
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RoundKey[(i * 4) + 3] = Key[(i * 4) + 3];
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}
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for (i = Nk; i < Nb * (Nr + 1); ++i)
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{
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{
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k = (i - 1) * 4;
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tempa[0]=RoundKey[k + 0];
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tempa[1]=RoundKey[k + 1];
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tempa[2]=RoundKey[k + 2];
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tempa[3]=RoundKey[k + 3];
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}
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if (i % Nk == 0)
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{
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const uint8_t u8tmp = tempa[0];
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tempa[0] = tempa[1];
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tempa[1] = tempa[2];
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tempa[2] = tempa[3];
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tempa[3] = u8tmp;
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tempa[0] = getSBoxValue(tempa[0]);
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tempa[1] = getSBoxValue(tempa[1]);
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tempa[2] = getSBoxValue(tempa[2]);
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tempa[3] = getSBoxValue(tempa[3]);
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tempa[0] = tempa[0] ^ Rcon[i/Nk];
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}
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if (i % Nk == 4)
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{
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tempa[0] = getSBoxValue(tempa[0]);
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tempa[1] = getSBoxValue(tempa[1]);
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tempa[2] = getSBoxValue(tempa[2]);
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tempa[3] = getSBoxValue(tempa[3]);
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}
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j = i * 4; k=(i - Nk) * 4;
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RoundKey[j + 0] = RoundKey[k + 0] ^ tempa[0];
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RoundKey[j + 1] = RoundKey[k + 1] ^ tempa[1];
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RoundKey[j + 2] = RoundKey[k + 2] ^ tempa[2];
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RoundKey[j + 3] = RoundKey[k + 3] ^ tempa[3];
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}
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}
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void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key)
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{
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KeyExpansion(ctx->RoundKey, key);
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}
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void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv)
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{
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KeyExpansion(ctx->RoundKey, key);
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memcpy (ctx->Iv, iv, AES_BLOCKLEN);
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}
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void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv)
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{
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memcpy (ctx->Iv, iv, AES_BLOCKLEN);
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}
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static void AddRoundKey(uint8_t round, state_t* state, const uint8_t* RoundKey)
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{
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uint8_t i,j;
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for (i = 0; i < 4; ++i)
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{
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for (j = 0; j < 4; ++j)
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{
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(*state)[i][j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
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}
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}
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}
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static void SubBytes(state_t* state)
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{
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uint8_t i, j;
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for (i = 0; i < 4; ++i)
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{
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for (j = 0; j < 4; ++j)
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{
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(*state)[j][i] = getSBoxValue((*state)[j][i]);
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}
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}
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}
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static void ShiftRows(state_t* state)
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{
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uint8_t temp;
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temp = (*state)[0][1];
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(*state)[0][1] = (*state)[1][1];
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(*state)[1][1] = (*state)[2][1];
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(*state)[2][1] = (*state)[3][1];
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(*state)[3][1] = temp;
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temp = (*state)[0][2];
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(*state)[0][2] = (*state)[2][2];
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(*state)[2][2] = temp;
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temp = (*state)[1][2];
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(*state)[1][2] = (*state)[3][2];
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(*state)[3][2] = temp;
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temp = (*state)[0][3];
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(*state)[0][3] = (*state)[3][3];
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(*state)[3][3] = (*state)[2][3];
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(*state)[2][3] = (*state)[1][3];
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(*state)[1][3] = temp;
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}
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static uint8_t xtime(uint8_t x)
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{
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return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
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}
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static void MixColumns(state_t* state)
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{
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uint8_t i;
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uint8_t Tmp, Tm, t;
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for (i = 0; i < 4; ++i)
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{
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t = (*state)[i][0];
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Tmp = (*state)[i][0] ^ (*state)[i][1] ^ (*state)[i][2] ^ (*state)[i][3] ;
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Tm = (*state)[i][0] ^ (*state)[i][1] ; Tm = xtime(Tm); (*state)[i][0] ^= Tm ^ Tmp ;
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Tm = (*state)[i][1] ^ (*state)[i][2] ; Tm = xtime(Tm); (*state)[i][1] ^= Tm ^ Tmp ;
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Tm = (*state)[i][2] ^ (*state)[i][3] ; Tm = xtime(Tm); (*state)[i][2] ^= Tm ^ Tmp ;
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Tm = (*state)[i][3] ^ t ; Tm = xtime(Tm); (*state)[i][3] ^= Tm ^ Tmp ;
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}
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}
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#define Multiply(x, y) \
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( ((y & 1) * x) ^ \
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((y>>1 & 1) * xtime(x)) ^ \
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((y>>2 & 1) * xtime(xtime(x))) ^ \
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((y>>3 & 1) * xtime(xtime(xtime(x)))) ^ \
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((y>>4 & 1) * xtime(xtime(xtime(xtime(x)))))) \
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static void Cipher(state_t* state, const uint8_t* RoundKey)
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{
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uint8_t round = 0;
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AddRoundKey(0, state, RoundKey);
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for (round = 1; ; ++round)
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{
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SubBytes(state);
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ShiftRows(state);
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if (round == Nr) {
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break;
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}
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MixColumns(state);
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AddRoundKey(round, state, RoundKey);
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}
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AddRoundKey(Nr, state, RoundKey);
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}
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void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length)
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{
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uint8_t buffer[AES_BLOCKLEN];
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size_t i;
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int bi;
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for (i = 0, bi = AES_BLOCKLEN; i < length; ++i, ++bi)
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{
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if (bi == AES_BLOCKLEN)
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{
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memcpy(buffer, ctx->Iv, AES_BLOCKLEN);
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Cipher((state_t*)buffer,ctx->RoundKey);
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for (bi = (AES_BLOCKLEN - 1); bi >= 0; --bi)
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{
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if (ctx->Iv[bi] == 255)
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{
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ctx->Iv[bi] = 0;
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continue;
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}
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ctx->Iv[bi] += 1;
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break;
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}
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bi = 0;
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}
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buf[i] = (buf[i] ^ buffer[bi]);
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}
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}
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@ -0,0 +1,23 @@
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#ifndef _TINY_AES_H_
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#define _TINY_AES_H_
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#include <stdint.h>
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#include <stddef.h>
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#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
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// #define AES_KEYLEN 32
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#define AES_keyExpSize 240
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struct AES_ctx
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{
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uint8_t RoundKey[AES_keyExpSize];
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uint8_t Iv[AES_BLOCKLEN];
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};
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void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
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void AES_init_ctx_iv(struct AES_ctx* ctx, const uint8_t* key, const uint8_t* iv);
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void AES_ctx_set_iv(struct AES_ctx* ctx, const uint8_t* iv);
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void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, size_t length);
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#endif // _TINY_AES_H_
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