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#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 ) { // ¤® ¢ë஢ïâì 256 ¡¨â
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[SHA256::DIGESTSIZE];
// SHA256().CalculateDigest(h, b, 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;
}
/*
RandomPool& GlobalRNG()
{
static RandomPool randomPool;
return randomPool;
}
*/
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());
}
// EOF
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