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AES buffer aligned to 16 bytes

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orignal 2014-11-18 12:11:45 -05:00
parent 96387aecbd
commit dd1a798128
2 changed files with 30 additions and 17 deletions
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31
aes.h
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@ -24,22 +24,43 @@ namespace crypto
typedef i2p::data::Tag<32> AESKey;
template<size_t sz>
class AESAlignedBuffer // 16 bytes alignment
{
public:
AESAlignedBuffer ()
{
m_Buf = m_UnalignedBuffer;
uint8_t rem = ((uint64_t)m_Buf) & 0x0f;
if (rem)
m_Buf += (16 - rem);
}
operator uint8_t * () { return m_Buf; };
operator const uint8_t * () const { return m_Buf; };
private:
uint8_t m_UnalignedBuffer[sz + 15]; // up to 15 bytes alignment
uint8_t * m_Buf;
};
#ifdef AESNI
class ECBCryptoAESNI
{
public:
ECBCryptoAESNI ();
uint8_t * GetKeySchedule () { return m_KeySchedule; };
protected:
void ExpandKey (const AESKey& key);
protected:
private:
uint8_t * m_KeySchedule; // start of 16 bytes boundary of m_UnalignedBuffer
uint8_t m_UnalignedBuffer[256]; // 14 rounds for AES-256, 240 + 16 bytes
AESAlignedBuffer<240> m_KeySchedule; // 14 rounds for AES-256, 240 bytes
};
class ECBEncryptionAESNI: public ECBCryptoAESNI