bad value returned by i2d_RSAPublicKey( RSA, NULL )

[William Estrada]

i2d_RSAPublicKey( RSA, NULL ) is to be used to get the size of an RSA 
structure.
The following code shows that it does not return the correct value.
    #define _GNU_SOURCE
    #include <string.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <openssl/rsa.h>  

    #define RSA_KEY_LENGTH 1024

    RSA  *My_RSA;
    RSA  *Pri_RSA;
    RSA  *Pub_RSA;

    int   RC, Size, Len, Run;
    unsigned char *Key, *Ptr;

    int
    main( ) {

      My_RSA = RSA_generate_key( 1024, 65537, NULL, NULL );

      RSA_blinding_on( My_RSA, NULL );

      Size = RSA_KEY_LENGTH;
     
      Key = Ptr = malloc( Size );

      Len = i2d_RSAPublicKey( My_RSA, NULL );

      Pri_RSA = d2i_RSAPrivateKey( NULL, (const unsigned char **)
    &Key, Len );

      printf("Size: %d, Len: %d, RSA: %d\n", Size, Len, Pri_RSA );

      RC = i2d_RSAPrivateKey( My_RSA, &Ptr );

      Pri_RSA = d2i_RSAPrivateKey( NULL, (const unsigned char **)
    &Key, RC );

      printf("Size: %d, Len: %d, RSA: %d\n", Size, RC, Pri_RSA );
     
      return 1; }

This is the output:

    rsakey
    Size: 1024, Len: 140, RSA: 0
    Size: 1024, Len: 608, RSA: 154555560

If you use the value returned by the call for the malloc, it will seg fault.

--
William Estrada
[EMAIL PROTECTED]
Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net )
Ymessenger: MrUmunhum

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