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very hash in one pass

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orignal 2015-06-09 13:02:37 -04:00
parent e461982a31
commit e8d80e16ba
1 changed files with 6 additions and 8 deletions
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14
ElGamal.h
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@ -60,15 +60,13 @@ namespace crypto
{ {
CryptoPP::Integer x(key, 256), a(zeroPadding? encrypted +1 : encrypted, 256), CryptoPP::Integer x(key, 256), a(zeroPadding? encrypted +1 : encrypted, 256),
b(zeroPadding? encrypted + 258 :encrypted + 256, 256); b(zeroPadding? encrypted + 258 :encrypted + 256, 256);
uint8_t m[255], hash[32]; uint8_t m[255];
a_times_b_mod_c (b, a_exp_b_mod_c (a, elgp - x - 1, elgp), elgp).Encode (m, 255); a_times_b_mod_c (b, a_exp_b_mod_c (a, elgp - x - 1, elgp), elgp).Encode (m, 255);
CryptoPP::SHA256().CalculateDigest(hash, m+33, 222); if (!CryptoPP::SHA256().VerifyDigest (m + 1, m + 33, 222))
for (int i = 0; i < 32; i++) {
if (hash[i] != m[i+1]) LogPrint ("ElGamal decrypt hash doesn't match");
{ return false;
LogPrint ("ElGamal decrypt hash doesn't match"); }
return false;
}
memcpy (data, m + 33, 222); memcpy (data, m + 33, 222);
return true; return true;
} }