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replaced ElGamalEncrypt to ElGamalEncryption

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orignal 2014-02-20 20:28:41 -05:00
parent 8d6c08ec78
commit 3c8f859169
5 changed files with 23 additions and 34 deletions
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32
ElGamal.h
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@ -17,14 +17,13 @@ namespace crypto
{
public:
ElGamalEncryption (const uint8_t * key, bool zeroPadding = false):
ElGamalEncryption (const uint8_t * key):
y (key, 256), k (rnd, CryptoPP::Integer::One(), elgp-1),
a (a_exp_b_mod_c (elgg, k, elgp)), b1 (a_exp_b_mod_c (y, k, elgp)),
m_ZeroPadding (zeroPadding)
a (a_exp_b_mod_c (elgg, k, elgp)), b1 (a_exp_b_mod_c (y, k, elgp))
{
}
void Encrypt (const uint8_t * data, int len, uint8_t * encrypted)
void Encrypt (const uint8_t * data, int len, uint8_t * encrypted, bool zeroPadding = false)
{
// calculate b = b1*m mod p
uint8_t m[255];
@ -34,7 +33,7 @@ namespace crypto
CryptoPP::Integer b (a_times_b_mod_c (b1, CryptoPP::Integer (m, 255), elgp));
// copy a and b
if (m_ZeroPadding)
if (zeroPadding)
{
encrypted[0] = 0;
a.Encode (encrypted + 1, 256);
@ -72,29 +71,6 @@ namespace crypto
memcpy (data, m + 33, 222);
return true;
}
// deprecated
inline void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, int len,
uint8_t * encrypted, bool zeroPadding = false) // 514 with padding and 512 without
{
CryptoPP::AutoSeededRandomPool rnd;
CryptoPP::Integer y(key, 256), k(rnd, CryptoPP::Integer::One(), elgp-1);
if (zeroPadding)
{
encrypted[0] = 0;
encrypted[257] = 0;
}
a_exp_b_mod_c (elgg, k, elgp).Encode (zeroPadding ? encrypted + 1 : encrypted, 256);
uint8_t m[255];
m[0] = 0xFF;
memcpy (m+33, data, len);
CryptoPP::SHA256().CalculateDigest(m+1, m+33, 222);
a_times_b_mod_c (a_exp_b_mod_c (y, k, elgp),
CryptoPP::Integer (m, 255), elgp).Encode (zeroPadding ? encrypted + 258 : encrypted + 256, 256);
}
}
}