Hi,
I am using RSA encryption.
I am using Crypto5.1 for encryption(c++) and bouncy
castle(java) for decryption.
Key generation is done using java key tool.From keys
generated, i am getting public key exponent and
modulus.
I am creating RSAFunction Using public key exponent
and modulus, and i am using RSAFunction:ApplyFunction
and BASE64 encoding techinque to return the
encryptedString.when i give this encrypted string i
get junk decrypted msg. On java side i am using RSA
with no padding.
If i Perform Applyfunction on string containing only
integer values i have this problem.(i.e
pToEncrypt="123").
If applyFunction is applied on string containing alpha
chars, i get length of encyrpted data as 1.
Is is this ApplyFunction only for Integer vaues.
I also tried to use
RSAPublicKeyTemplate<EncryptorTemplate<PKCS_EncryptionPaddingScheme,
RSAFunction>, RSAES_PKCS1v15_Decryptor>. For this we
need to provide random seed. what is this?? i just
provided the value 0.
When i decrypt the encrypted string using java ,i get
input data size is too long exception.
For RSA decryption in java, i have provided
RSA/ECB/PKCS1Padding i.e PKCS1 V 1.5. Random number is
auto generated here. no need to input the random seed.
Pl. anybody has solution for this.
I have just included my c++ sample for both cases
case 1: using RSAFunction
char* TestEncryption::encryptString(string
pToEncrypt){
char * inputString;
int len=pToEncrypt.length();
inputString=new char[len];
pToEncrypt.copy(inputString, len);
Integer *inputVal=new Integer(inputString);
Integer
encryptIntValue=rsaFunction->ApplyFunction(*inputVal);
Integer::Signedness mysign;
mysign=(Integer::Signedness)1;
unsigned int
outputLen=encryptIntValue.MinEncodedSize(mysign);
cout<<" \n OUTPUT LEN "<<outputLen;
byte * output=new byte[outputLen];
encryptIntValue.Encode (output,outputLen,mysign);
char *outstr;
int modulus = outputLen% 3;
if (modulus == 0){
len=4 * outputLen/ 3;
}else{
len=4* ((outputLen/3)+1);
}
outstr=new char[len];
len=len;
cout<<" \n LEN OF ENCYPTED DATA "<<len;
Base64Encoder base64Encoder;
base64Encoder.Put((byte*)output,outputLen);
base64Encoder.MessageEnd();
base64Encoder.Get((byte *)outstr,len);
cout<<"outstr \n "<<outstr;
return outstr;
}
case 2:
RSAPublicKeyTemplate<EncryptorTemplate<PKCS_EncryptionPaddingScheme,
RSAFunction>, RSAES_PKCS1v15_Decryptor>
char* encryptString(string pToEncrypt){
char * inputString;
int len=pToEncrypt.length();
inputString=new char[len];
pToEncrypt.copy(inputString, len);
cout<<"\n INPUT STRING "<<inputString;
Integer *inputVal=new Integer(inputString);
RSAPublicKeyTemplate<EncryptorTemplate<PKCS_EncryptionPaddingScheme,
RSAFunction>, RSAES_PKCS1v15_Decryptor>
pubKey(rsaFunction->GetModulus(),rsaFunction->GetExponent());
char seed[1024];
cout << "\nRandom Seed: ";
ws(cin);
cin.getline(seed, 1024);
RandomPool randPool;
randPool.Put((byte *)seed, strlen(seed));
char *outstr = new char[pubKey.CipherTextLength()];
pubKey.Encrypt(randPool, (byte *)inputString,
strlen(inputString), (byte *)outstr);
int outputLen=pubKey.CipherTextLength();
int modulus = outputLen% 3;
if (modulus == 0){
len=4 * outputLen/ 3;
}else{
len=4* ((outputLen/3)+1);
}
char *output=new char[len];
Base64Encoder base64Encoder;
base64Encoder.Put((byte*)outstr,outputLen);
base64Encoder.MessageEnd();
base64Encoder.Get((byte *)output,len);
cout<<"output \n "<<output;
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