Thank you :)
Sebastian <[EMAIL PROTECTED]> wrote:
Sebastian <[EMAIL PROTECTED]> wrote:
Hmm,
take a look at routines like RSA_new() to create RSA structures. As you coded
'sizeof apub', this will return the size of a _pointer_ - assuming a 32-bit
architecture you will get round about four bytes ;-).
See: http://www.openssl.org/docs/crypto/RSA_new.html
The runtime error is caused by calling RSA_size() with a null pointer -
unfortnunfortunately RSA_size() doesn't like null pointers.
See: http://www.openssl.org/docs/crypto/RSA_size.html
Good luck,
Sebastian
> Hi all,
>
> I'm trying to develop a C++ application to encrypt and decrypt data
> using RSA public key cryptography scheme. I have generated the
> public/private keys using OpenSSL command line tool. The following C++
> code should read a public key, encrypt data, read private key and
> decrypt the data:
> ********************************************************************
> #include
> #include
> #include
> #include
> #include
>
>
> int main()
> {
> char *message ="Hello World!";
> RSA *apub;
> RSA *aprivate;
> FILE *f;
> int ret;
> unsigned char *buf;
> unsigned char *e_data;
> unsigned char *clear_text;
>
>
> //Get key
> f= fopen("a_rsa_public","rb");
> if(f == NULL)
> {
> printf("\nError opening public key file");
> return -1;
> }
> else
> printf("\n Public key file opened");
>
> //load the key
> if ( fread(&apub,sizeof apub,1,f) != 1)
> {
> printf("\nError reading public key");
> return -1;
> }
> else
> printf("\nPublic key read");
>
> //close the key file
> fclose(f);
>
> buf = (unsigned char *) malloc(strlen(message));
> memcpy(buf,message,strlen(message));
>
> e_data = (unsigned char *) malloc(RSA_size(apub)); // THIS is where i
> get a run time error
>
> //encrypt data
> RSA_public_encrypt(strlen(message),buf, e_data, apub,
> RSA_PKCS1_OAEP_PADDING);
>
> //------------------decrypt
> //Get key
> f= fopen("a_rsa_private","rb");
> if(f == NULL)
> {
> printf("\nError opening private key file");
> return -1;
> }
> //load the key
> ret = fread(&aprivate,sizeof(aprivate),1,f);
> //close the key file
> fclose(f);
>
> //make sure we loaded ok
> if(ret != 1)
> {
> printf("\nError reading private key");
> return -1;
> }
>
> clear_text= (unsigned char *) malloc(strlen(message));
> RSA_private_decrypt(strlen((char*)e _data), e_data, clear_text,
> aprivate, RSA_PKCS1_OAEP_PADDING);
> return 0;
> }
>
> *******************************************************************************
> At first I used to get a run time error in the RSA_public_encrypt(...);
> and I figured caused I had e_data initialized as:
> e_data = (unsigned char *) malloc(strlen(message)*4);
>
> So instead I used :
> e_data = (unsigned char *) malloc(RSA_size(apub));
> and now I'm getting a run time as this line is encountered.
>
> I'm sure someone with experience would be able to spot my mistake.
>
> I thank you all in advance for your help.
>
>
>
>
>
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