Thanks Jeffrey,
but I have already test this code example, it's this piece of code:
string RSADecryptString(const char *privFilename, const char
*ciphertext)
{
FileSource privFile(privFilename, true, new HexDecoder);
RSAES_OAEP_SHA_Decryptor priv(privFile);
string result;
StringSource(ciphertext, true, new HexDecoder(new
PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(result))));
return result;
}
but this code doesn't work with my private key and ciphertext ,
this private key and ciphertext was generated by a Java application ( with
JCE package cryptography ), it seems that CryptoPP have maybe a problem if
privatekey and ciphertext are created by Java applications ?
you can help me by this way: I send you with this mail 2 files that
represent
the privateKey and the ciphertext in binary format ( pure format, not text
format )
can you tell me if you can decrypt the ciphertext with cryptoPP ?
thanks
"Jeffrey Walton" <[EMAIL PROTECTED]> a écrit dans le message de news:
[EMAIL PROTECTED]
> Hi Gordon,
>
> The followinf is taken from 5.2.1's test.cpp:
>
> void GenerateRSAKey(unsigned int keyLength, const char *privFilename,
> const char *pubFilename, const char *seed)
> {
> RandomPool randPool;
> randPool.Put((byte *)seed, strlen(seed));
>
> RSAES_OAEP_SHA_Decryptor priv(randPool, keyLength);
> HexEncoder privFile(new FileSink(privFilename));
> priv.DEREncode(privFile);
> privFile.MessageEnd();
>
> RSAES_OAEP_SHA_Encryptor pub(priv);
> HexEncoder pubFile(new FileSink(pubFilename));
> pub.DEREncode(pubFile);
> pubFile.MessageEnd();
> }
>
> string RSAEncryptString(const char *pubFilename, const char *seed,
> const char *message)
> {
> FileSource pubFile(pubFilename, true, new HexDecoder);
> RSAES_OAEP_SHA_Encryptor pub(pubFile);
>
> RandomPool randPool;
> randPool.Put((byte *)seed, strlen(seed));
>
> string result;
> StringSource(message, true, new PK_EncryptorFilter(randPool,
> pub, new HexEncoder(new StringSink(result))));
> return result;
> }
>
> string RSADecryptString(const char *privFilename, const char
> *ciphertext)
> {
> FileSource privFile(privFilename, true, new HexDecoder);
> RSAES_OAEP_SHA_Decryptor priv(privFile);
>
> string result;
> StringSource(ciphertext, true, new HexDecoder(new
> PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(result))));
> return result;
> }
>
>>>> [EMAIL PROTECTED] 2/8/2006 3:25 PM >>>
> Hi,
>
> I am a newbie with cryptoPP
>
> I am trying to decrypt a string that was crypted in RSA
>
> but it doesn't work, I have an exception that say "Invalid
> ciphertext",
>
> in my program the RSA private key was succesfully loaded, but when the
>
> program try to decrypt the ciphertext it doesn't work
>
> I am sure that the ciphertext is Ok, so I don't understand, I need help
>
> please
>
> here my source code:
>
> std::string Crypto::RSADecryptString( const char *privKey, const char
>
> *ciphertext){
>
> //privKey is the privateKey, in hexadecimal format
> StringSource privFile(privKey, true, new HexDecoder);
> RSAES_OAEP_SHA_Decryptor priv(privFile);
>
> //here we try to decrypt a ciphertext, here ciphertext is in
>
> hexadecimal format
> RandomPool randomPool;
> string result;
> StringSource(ciphertext, true, new HexDecoder(new
> PK_DecryptorFilter(randomPool, priv, new StringSink(result))));
> return result;
>
> }
>
> can you send me a source code who explain the encryption/decryption
> method
> for RSA ?
>
> thanks
>
>
>
>
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