// #decrypt()
int AffineCipher::decrypt
(
const vector<byte>& cipher_text,
const vector<byte>& key,
vector<byte>& plain_text)
{
int plain_len = 0;
vector<byte>::const_iterator ct_it;
vector<byte>::const_iterator key_it;
key_it = key.begin();
byte key1 = *key_it;
key_it++;
byte key2 = *key_it;
ct_it = cipher_text.begin();
while (ct_it!=cipher_text.end())
{
int result = multInverse(key1) * (*ct_it - key2)%26;
while(result < 0)
{
result += 26;
}
plain_text.push_back(result);
ct_it++;
plain_len++;
}
return plain_len;
} // decrypt()
void multInverseEq(W& a) {
a = multInverse(a);
}
