56 lines
905 B
C++
56 lines
905 B
C++
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// AesCfb128Decryptor.cpp
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// Implements the cAesCfb128Decryptor class decrypting data using AES CFB-128
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#include "Globals.h"
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#include "AesCfb128Decryptor.h"
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cAesCfb128Decryptor::cAesCfb128Decryptor(void):
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m_IsValid(false)
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{
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mbedtls_aes_init(&m_Aes);
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}
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cAesCfb128Decryptor::~cAesCfb128Decryptor()
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{
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// Clear the leftover in-memory data, so that they can't be accessed by a backdoor
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mbedtls_aes_free(&m_Aes);
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}
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void cAesCfb128Decryptor::Init(const Byte a_Key[16], const Byte a_IV[16])
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{
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ASSERT(!IsValid()); // Cannot Init twice
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memcpy(m_IV, a_IV, 16);
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mbedtls_aes_setkey_enc(&m_Aes, a_Key, 128);
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m_IsValid = true;
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}
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void cAesCfb128Decryptor::ProcessData(Byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length)
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{
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ASSERT(IsValid()); // Must Init() first
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mbedtls_aes_crypt_cfb8(&m_Aes, MBEDTLS_AES_DECRYPT, a_Length, m_IV, a_EncryptedIn, a_DecryptedOut);
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}
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