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Improve MbedTLS implementation of AES-CBC

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Cameron Gutman
2021-04-22 17:08:35 -05:00
parent d7549cd953
commit 29d2cc6d5b
4 changed files with 59 additions and 16 deletions
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7
src/InputStream.c
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@@ -79,12 +79,13 @@ static int encryptData(unsigned char* plaintext, int plaintextLen,
else {
// PKCS7 padding may need to be added in-place, so we must copy this into a buffer
// that can safely be modified.
unsigned char paddedData[MAX_INPUT_PACKET_SIZE];
unsigned char paddedData[ROUND_TO_PKCS7_PADDED_LEN(MAX_INPUT_PACKET_SIZE)];
memcpy(paddedData, plaintext, plaintextLen);
// Prior to Gen 7, 128-bit AES CBC is used for encryption
return PltEncryptMessage(cryptoContext, ALGORITHM_AES_CBC, 0,
// Prior to Gen 7, 128-bit AES CBC is used for encryption with each message padded
// to the block size to ensure messages are not delayed within the cipher.
return PltEncryptMessage(cryptoContext, ALGORITHM_AES_CBC, CIPHER_FLAG_PAD_TO_BLOCK_SIZE,
(unsigned char*)StreamConfig.remoteInputAesKey, sizeof(StreamConfig.remoteInputAesKey),
currentAesIv, sizeof(currentAesIv),
NULL, 0,