Re: PK_DecryptorFilter Returns empty string

On Wednesday, June 8, 2022 at 10:10:41 PM UTC-4 [email protected] wrote:

> Hi there 
> i have two functions encrypt and decrypt as follows
>
> *ENCRYPT()*
> ECIES<ECP>::Decryptor d0(prng, ASN1::secp256r1());
>     PrintPrivateKey(d0.GetKey());
>
>     ECIES<ECP>::Encryptor e0(d0);
>     PrintPublicKey(e0.GetKey());
>     SavePrivateKey(d0.GetPrivateKey());
>     SavePublicKey(e0.GetPublicKey());
>
>     ifstream infile;
>     ofstream outfile;
>     string sen,sen1,line,enc;
>     sen.clear();
>     line.clear();
>     enc.clear();
>     infile.open("Me/text.txt");
>     if(infile.is_open()){
>         while(!infile.eof()){
>             getline(infile,line);
>             sen1 = sen1 + line;                                 
>         }
>     }
>     StringSource ss1(sen,true,new PK_EncryptorFilter(prng,e0,new 
> StringSink(enc)));
>     cout<<"Encrypted:"<<endl<<enc<<endl;
>     infile.close();    
>     string encoded;
>     StringSource ss3(enc, true, new HexEncoder(new StringSink(encoded)));
>     outfile.open("Me/e1nc_text.txt");
>     outfile<<encoded;
>     outfile.close();
>     cout<<"Encoded: "<< encoded<<endl;
>
>
> *--------------------------------------------------------------------------------------------------------*
> In the above function  a file is opened and all the content is first 
> ENCRYPTED using ECIES
> and the ENCODED WITH HEXENCODER and Saved in an another file.
>
>
>
> ------------------------------------------------------------------------------------------------------------------------------------------------
> *DECRYPT()*
>
> ECIES<ECP>::Decryptor d1;
>     ECIES<ECP>::Decryptor d0(prng, ASN1::secp256r1());
>     LoadPrivateKey(d1.AccessPrivateKey());
>     d1.GetPrivateKey().ThrowIfInvalid(prng, 3);
>     
>     ECIES<ECP>::Encryptor e1;
>     LoadPublicKey(e1.AccessPublicKey());
>     e1.GetPublicKey(). ThrowIfInvalid(prng, 3);
>  
>     PrintPrivateKey(d1.GetKey());
>      PrintPublicKey(e1.GetKey());
>         
>     ifstream file;
>     string sen,line,dec,decoded;
>     sen.clear();
>     line.clear();
>     file.open("Me/e1nc_text.txt");
>     if(file.is_open()){
>         while(!file.eof()){
>             getline(file,line);
>             sen = sen + line;                                 
>         }
>     }
>     StringSource ss7 (sen,true, new HexDecoder(new StringSink(decoded)));
>     cout<<"Decoded"<<endl<<decoded;
>     StringSource ss8 (decoded,true,new PK_DecryptorFilter(prng,d1,new 
> StringSink(dec)));
>     cout<<endl<<"Decrypted:"<<endl;
>     cout<<dec;
>     ofstream outfile("Me/decrypt.txt");
>     outfile<<dec;
>
> --------------------------------------------------------------------------------------------------------------------------------------------------
> The encrypted and encoded file is extracted and first decoded after that 
> at decryption part
> the string variable dec is the one in which the decrypted string should be 
> stored but when out putted  it shows empty string
>
> The output of the above is the following:[image: Screenshot from 
> 2022-06-09 07-37-06.png]
> THE ENCRYPTED and THE DECODED OUTPUTS ARE the same thus its not an invalid 
> cipher text yet At the last line the *Decrypted :  *as we can see is 
> empty.
>

Please provide a self contained sample that I can compile and run.

Also, you should consider using a FileSource/FileSink  instead of file 
streams.

Jeff

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