Re: RSA settings?

[Layla]

Hi Sebastian:

 

Thank you for your response. Actually I am not getting any specific error messages, but as I try running my application from the IDE (MS VC++ 6 studio) the program crashes: meaning that as soon as a function which uses the RSA object is encountered the program stops executing and a windows generated message is displayed where it says that an error has occured with the application.

 

Does that ring a bell?

Sebastian <[EMAIL PROTECTED]> wrote:

Hi Layla,
there a no special settings for RSA. What are your problems to run your app -
please tell us the errors / abends you get to help us locating the cause(s).

Sebastian


Layla wrote:
> Angel,
> Thank you sooo much for the function, I really appreciate it, but as
> I've expected it didn't work. Which confirms that there's nothing wrong
> with the functions, but rather something is perhaps wrong with my
> configuration. Therefore, if anyone knows of any special settings
> required for RSA please let me know.
> I'm using windows XP pro. I have ensured that the .dll files are copied
> to the system32 folder. Also I have no problem running symmetric EVP
> crypto on this machine so I don't think there's anything wrong with my
> OpenSSL installation.
> I am able to compile and link but I just can't run!
>
> Suggestions?
>
> */Angel Martinez Gonzalez <[EMAIL PROTECTED]>/* wrote:
>
> Hello:
>
> I send you a function that read RSA public and private key from a file:
>
> RSA *RecuperaClavesRSA(int type, char *pemfile)
> {
> FILE *fp;
> RSA *key=NULL;
> switch (type){
> case READPUB:
> if((fp = fopen(pemfile,"r")) == NULL) {
> fprintf(stderr,"Error: Public Key file doesn't exists.\n");
> exit(EXIT_FAILURE);
> }
> if((key = PEM_read_RSAPublicKey(fp,NULL,NULL,NULL)) == NULL) {
> fprintf(stderr,"Error: problems while reading Public Key.\n");
> exit(EXIT_FAILURE);
> }
> fclose(fp);
> printf("RSA size: %d", RSA_size(key));
>
> return key;
> break;
> case READSEC:
> if((fp = fopen(pemfile,"r")) == NULL) {
> fprintf(stderr,"Error: Private Key file doesn't exists.\n");
> exit(EXIT_FAILURE);
> }
> if((key = PEM_read_RSAPrivateKey(fp,NULL,NULL,NULL)) == NULL) {
> fprintf(stderr,"Error: problmes while reading Private Key.
> %d %s\n",type,pemfile);
> exit(EXIT_FAILURE);
> }
> fclose(fp);
> if(RSA_check_key(key) == -1) {
> fprintf(stderr,"Error: Problems while reading RS A Private
> Key in \
> '%s' file.\n",pemfile);
> exit(EXIT_FAILURE);
> } else if(RSA_check_key(key) == 0) {
> fprintf(stderr,"Error: Bad RSA Private Key readed in '%s' \
> file.\n",pemfile);
> exit(EXIT_FAILURE);
> }
> else
> return key;
> break;
> }
> return key;
> }
> If the parameter "type" is "READPUB" it read the public key from the
> file "pemfile", and if this parameter is "READSEC", it read the
> private key.
>
> Too, this function show RSA size correctly.
>
> I hope this function solve your problem.
>
> Regards.
>
> P.D.: Your name remember me a very famous song of Eric Clapton ... ;-)
>
> ----- Original Message -----
> *From:* Layla
> *To:* openssl-users@openssl.org
> *Sent:* Tuesday, May 10, 2005 3:55 PM
> *Subject:* Re: Loading RSA keys from file.
>
> Hi Angel,
> Thank you for your response. I have changed my code with
> accordance to your suggestion but I'm still getting a runtime
> error when attempting to read the key from its file.
> So far I'm having trouble with 1- reading the key from file, and
> 2- RSA_size() , this function generates a runtime error when
> encountered as well. I can't think of anything since I'm
> initializing my RSA object.
> Suggestions ?
>
> */Angel Martinez Gonzalez <[EMAIL PROTECTED]>/* wrote:
>
> Hello Layla:
>
> Maybe, your error disapear if you will change the following:
>
> apub = PEM_read_RSAPublicKey(f, NULL, NULL, NULL);
>
> Regards.
>
> ----- Original Message -----
> *From:* Layla
> *To:* openssl-users@openssl.org
>
> *Sent:* Tuesday, May 10, 2005 9:30 AM
> *Subject:* Loading RSA keys from file.
>
> I'm still not able to load the key from its file and I'm
> still encountering an error when I use RSA_size(); a run
> time error occured when I try to print the returned
> size. I'm including a segment of my code after modification:
>
> ************************************************************
> RSA *apub;
> FILE *f;
>
>
> seed_prng(); // my function for seeding PRNG
>
> //Allocating apub
> apub = RSA_new();
>
> if ( apub == NULL)
> //print error mesage
>
> //open key file
> f= fopen ("a_rsa_public","r");
> if (f == NULL)
> //print error message
>
> //Loading key
> apub = PEM_read_RSAPublicKey(f, &apub, 0,0); //a run
> time error occurs here
> if (apub == NULL)
> {
> // print error message
> return -1;
> }
>
> /* if I try the following line after the allocation of
> the RSA object I get a runtime error as well*/
> printf("RSA size: %d", RSA_size(apub);
> *******************************************************************************
> I'm thankful for any help I can get.
>
>
> */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 wi ll 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;
& gt; > }
> >
> > 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.
> >
> >
& gt; >
> >
> >
> > __________________________________________________
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