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Refactor platform cryptography, add tests

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This commit is contained in:
Jonathan Bennett
2024-08-10 22:38:05 -05:00
parent b573e0eacc
commit 1cfd5d12d2
11 changed files with 88 additions and 276 deletions
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29
src/platform/nrf52/NRF52CryptoEngine.cpp
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@@ -9,41 +9,24 @@ class NRF52CryptoEngine : public CryptoEngine
~NRF52CryptoEngine() {}
/**
* Encrypt a packet
*
* @param bytes is updated in place
*/
virtual void encrypt(uint32_t fromNode, uint64_t packetId, size_t numBytes, uint8_t *bytes) override
virtual void encryptAESCtr(CryptoKey _key, uint8_t *_nonce, size_t numBytes, uint8_t *bytes) override
{
if (key.length > 16) {
LOG_DEBUG("Software encrypt fr=%x, num=%x, numBytes=%d!\n", fromNode, (uint32_t)packetId, numBytes);
if (_key.length > 16) {
AES_ctx ctx;
initNonce(fromNode, packetId);
AES_init_ctx_iv(&ctx, key.bytes, nonce);
AES_init_ctx_iv(&ctx, _key.bytes, _nonce);
AES_CTR_xcrypt_buffer(&ctx, bytes, numBytes);
} else if (key.length > 0) {
LOG_DEBUG("nRF52 encrypt fr=%x, num=%x, numBytes=%d!\n", fromNode, (uint32_t)packetId, numBytes);
} else if (_key.length > 0) {
nRFCrypto.begin();
nRFCrypto_AES ctx;
uint8_t myLen = ctx.blockLen(numBytes);
char encBuf[myLen] = {0};
initNonce(fromNode, packetId);
ctx.begin();
ctx.Process((char *)bytes, numBytes, nonce, key.bytes, key.length, encBuf, ctx.encryptFlag, ctx.ctrMode);
ctx.Process((char *)bytes, numBytes, _nonce, _key.bytes, _key.length, encBuf, ctx.encryptFlag, ctx.ctrMode);
ctx.end();
nRFCrypto.end();
memcpy(bytes, encBuf, numBytes);
}
}
virtual void decrypt(uint32_t fromNode, uint64_t packetId, size_t numBytes, uint8_t *bytes) override
{
// For CTR, the implementation is the same
encrypt(fromNode, packetId, numBytes, bytes);
}
private:
};
CryptoEngine *crypto = new NRF52CryptoEngine();
CryptoEngine *crypto = new NRF52CryptoEngine();