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encrypt/decrypt same buffer

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orignal 2014-05-06 13:26:28 -04:00
parent d8d8c752b1
commit 81b57141d4
2 changed files with 21 additions and 1 deletions
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20
aes.cpp
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@ -1,3 +1,4 @@
#include <stdlib.h>
#include "aes.h" #include "aes.h"
namespace i2p namespace i2p
@ -15,16 +16,33 @@ namespace crypto
} }
} }
bool CBCEncryption::Encrypt (const uint8_t * in, std::size_t len, uint8_t * out)
{
div_t d = div (len, 16);
if (d.rem) return false; // len is not multipple of 16
Encrypt (d.quot, (const ChipherBlock *)in, (ChipherBlock *)out);
return true;
}
void CBCDecryption::Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out) void CBCDecryption::Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out)
{ {
for (int i = 0; i < numBlocks; i++) for (int i = 0; i < numBlocks; i++)
{ {
ChipherBlock tmp = in[i];
m_ECBDecryption.ProcessData (out[i].buf, in[i].buf, 16); m_ECBDecryption.ProcessData (out[i].buf, in[i].buf, 16);
out[i].ll[0] ^= m_IV.ll[0]; out[i].ll[0] ^= m_IV.ll[0];
out[i].ll[1] ^= m_IV.ll[1]; out[i].ll[1] ^= m_IV.ll[1];
m_IV = in[i]; m_IV = tmp;
} }
} }
bool CBCDecryption::Decrypt (const uint8_t * in, std::size_t len, uint8_t * out)
{
div_t d = div (len, 16);
if (d.rem) return false; // len is not multipple of 16
Decrypt (d.quot, (const ChipherBlock *)in, (ChipherBlock *)out);
return true;
}
} }
} }

2
aes.h
View file

@ -25,6 +25,7 @@ namespace crypto
void SetIV (uint8_t * iv) { memcpy (m_LastBlock.buf, iv, 16); }; // 16 bytes void SetIV (uint8_t * iv) { memcpy (m_LastBlock.buf, iv, 16); }; // 16 bytes
void Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out); void Encrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
bool Encrypt (const uint8_t * in, std::size_t len, uint8_t * out);
private: private:
@ -42,6 +43,7 @@ namespace crypto
void SetIV (uint8_t * iv) { memcpy (m_IV.buf, iv, 16); }; // 16 bytes void SetIV (uint8_t * iv) { memcpy (m_IV.buf, iv, 16); }; // 16 bytes
void Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out); void Decrypt (int numBlocks, const ChipherBlock * in, ChipherBlock * out);
bool Decrypt (const uint8_t * in, std::size_t len, uint8_t * out);
private: private: