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Reduce the object state size of AES

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This commit is contained in:
Rhys Weatherley
2016-01-16 08:44:35 +10:00
parent 1ae693127c
commit b852d222b4
3 changed files with 20 additions and 24 deletions
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4
libraries/Crypto/AES.h
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@@ -47,10 +47,6 @@ protected:
void keyScheduleCore(uint8_t *output, const uint8_t *input, uint8_t iteration);
void applySbox(uint8_t *output, const uint8_t *input);
/** @endcond */
private:
uint8_t state1[16];
uint8_t state2[16];
};
class AES128 : public AESCommon

8
libraries/Crypto/AESCommon.cpp
View File

@@ -133,8 +133,6 @@ AESCommon::AESCommon()
*/
AESCommon::~AESCommon()
{
clean(state1);
clean(state2);
}
/**
@@ -268,6 +266,8 @@ void AESCommon::encryptBlock(uint8_t *output, const uint8_t *input)
const uint8_t *roundKey = schedule;
uint8_t posn;
uint8_t round;
uint8_t state1[16];
uint8_t state2[16];
// Copy the input into the state and XOR with the first round key.
for (posn = 0; posn < 16; ++posn)
@@ -297,6 +297,8 @@ void AESCommon::decryptBlock(uint8_t *output, const uint8_t *input)
const uint8_t *roundKey = schedule + rounds * 16;
uint8_t round;
uint8_t posn;
uint8_t state1[16];
uint8_t state2[16];
// Copy the input into the state and reverse the final round.
for (posn = 0; posn < 16; ++posn)
@@ -324,8 +326,6 @@ void AESCommon::decryptBlock(uint8_t *output, const uint8_t *input)
void AESCommon::clear()
{
clean(schedule, (rounds + 1) * 16);
clean(state1);
clean(state2);
}
/** @cond */