#include "commonheaders.h"

const string padding = "PADDING!PADDING!PADDING!PADDING!"; // 256 bit

string pad256(string& str)
{
	string out = str;
	int pad = out.length() % 32;
	if (pad) { // надо выровнять на 256 бит
		if (pad > 3) {
			out += tlv(0, padding.substr(0, 32 - 3 - pad));
		}
		else {
			if (pad == 3) out += string("\0\0\0");
			else
				if (pad == 2) out += string("\0\0");
				else         out += string("\0");
		}
	}
	return out;
}


string& add_delim(string& str, const string& del, int len)
{
	string val;
	for (u_int i = 0; i < str.length(); i += len) {
		val += str.substr(i, len) + del;
	}
	str = val;
	return str;
}


string& del_delim(string& str, const string& del)
{
	string val;
	for (u_int i = 0; i < str.length(); i++) {
		if (del.find(str[i]) == string::npos)
			val += str[i];
	}
	str = val;
	return str;
}


string tlv(int t, const string& v)
{
	string b;
	t |= v.length() << 8;
	b.assign((const char*)&t, 3);
	b += v;
	return b;
}


string tlv(int t, const char* v)
{
	return tlv(t, string(v));
}


string tlv(int t, int v)
{
	string s;
	u_int l = (v <= 0xFF) ? 1 : ((v <= 0xFFFF) ? 2 : ((v <= 0xFFFFFF) ? 3 : 4));
	s.assign((char*)&v, l);
	return tlv(t, s);
}


string& un_tlv(string& b, int& t, string& v)
{
	string r; v = r;
	if (b.length() > 3) {
		t = 0;
		b.copy((char*)&t, 3);
		u_int l = t >> 8;
		t &= 0xFF;
		if (b.length() >= 3 + l) {
			v = b.substr(3, l);
			r = b.substr(3 + l);
		}
	}
	if (!v.length()) {
		t = -1;
	}
	b = r;
	return b;
}

string& un_tlv(string& b, int& t, int& v)
{
	string s;
	un_tlv(b, t, s);
	v = 0;
	s.copy((char*)&v, s.length());
	return b;
}

int str2int(string& s)
{
	int v = 0;
	if (s.length() <= sizeof(int))
		s.copy((char*)&v, s.length());
	return v;
}

string hash(string& b)
{
	return ::hash((PBYTE)b.data(), b.length());
}

string hash(PBYTE b, int l)
{
	BYTE h[RSA_KEYSIZE];
	RSA_CalculateDigest(h, b, l);
	string s; s.assign((char*)&h, RSA_KEYSIZE);
	return s;
}

string hash128(string& b)
{
	return hash128((PBYTE)b.data(), b.length());
}

string hash128(LPSTR b)
{
	return hash128((PBYTE)b, strlen(b));
}

string hash128(PBYTE b, int l)
{
	BYTE h[RIPEMD128::DIGESTSIZE];
	RIPEMD128().CalculateDigest(h, b, l);
	string s; s.assign((char*)&h, sizeof(h));
	return s;
}

string hash256(string& b)
{
	return hash256((PBYTE)b.data(), b.length());
}

string hash256(LPSTR b)
{
	return hash256((PBYTE)b, strlen(b));
}

string hash256(PBYTE b, int l)
{
	BYTE h[RIPEMD256::DIGESTSIZE];
	RIPEMD256().CalculateDigest(h, b, l);
	string s; s.assign((char*)&h, sizeof(h));
	return s;
}

Integer BinaryToInteger(const string& data)
{
	StringSource ss(data, true, NULL);
	SecByteBlock result(ss.MaxRetrievable());
	ss.Get(result, result.size());
	return Integer(result, result.size());
}

string IntegerToBinary(const Integer& value)
{
	SecByteBlock sbb(value.MinEncodedSize());
	value.Encode(sbb, sbb.size());
	string data;
	StringSource(sbb, sbb.size(), true, new StringSink(data));
	return data;
}

AutoSeededRandomPool& GlobalRNG()
{
	static AutoSeededRandomPool randomPool;
	return randomPool;
}

void GenerateRSAKey(unsigned int keyLength, string& privKey, string& pubKey)
{
	RSAES_PKCS1v15_Decryptor priv(GlobalRNG(), keyLength);
	StringSink privFile(privKey);
	priv.DEREncode(privFile);
	privFile.MessageEnd();

	RSAES_PKCS1v15_Encryptor pub(priv);
	StringSink pubFile(pubKey);
	pub.DEREncode(pubFile);
	pubFile.MessageEnd();
}

string RSAEncryptString(const RSA::PublicKey& pubkey, const string& plaintext)
{
	RSAES_PKCS1v15_Encryptor pub(pubkey);

	string result;
	StringSource(plaintext, true, new PK_EncryptorFilter(GlobalRNG(), pub, new StringSink(result)));
	return result;
}

string RSADecryptString(const RSA::PrivateKey& privkey, const string& ciphertext)
{
	RSAES_PKCS1v15_Decryptor priv(privkey);

	string result;
	try {
		StringSource(ciphertext, true, new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(result)));
	}
	catch (...) {
		;
	}
	return result;
}

string RSASignString(const RSA::PrivateKey& privkey, const string& plaintext)
{
	RSASSA_PKCS1v15_SHA_Signer priv(privkey);

	string result;
	try {
		StringSource(plaintext, true, new SignerFilter(GlobalRNG(), priv, new StringSink(result)));
	}
	catch (...) {
		;
	}
	return result;
}

BOOL RSAVerifyString(const RSA::PublicKey& pubkey, const string& plaintext, const string& sig)
{
	RSASSA_PKCS1v15_SHA_Verifier ver(pubkey);

	return ver.VerifyMessage((PBYTE)plaintext.data(), plaintext.length(), (PBYTE)sig.data(), sig.length());
}