Proplem with RSA_private_encrypt and OAEP

[Robert Inzinger - SKIDATA]

Hi

I try to use RSA_private_encrypt and OAEP and always get the error at the call 
of RSA_private_encrypt :

Error code: 4066076 in .\crypto\rsa\rsa_eay.c line 6029358.

Samplecode:

void SimpleTest()
{
       RSA * rsa;
       RSA * rsapub;
       RSA * rsapri;

       unsigned char src[1000] = "1234567";
       unsigned char enc[1000] = {0};
       unsigned char dec[1000] = {0};
       int result;
       int pubKeyLen, priKeyLen;
       const byte *pubKey;
       const byte *priKey;
       byte *dummy;

       OpenSSL_add_all_algorithms();

       if (!(rsa = RSA_generate_key(1024, 0x10001, NULL, NULL)))
             return;

       pubKeyLen = i2d_RSAPublicKey(rsa, NULL);
       pubKey = dummy =(byte *) malloc (pubKeyLen);
       i2d_RSAPublicKey(rsa, &dummy);
       rsapub = d2i_RSAPublicKey(NULL, &pubKey, pubKeyLen);

       priKeyLen = i2d_RSAPrivateKey(rsa, NULL);
       priKey = dummy = (byte *) malloc (priKeyLen);
       i2d_RSAPrivateKey(rsa, &dummy);
       rsapri = d2i_RSAPrivateKey(NULL, &priKey, priKeyLen);


       if ((result = RSA_private_encrypt(strlen((char*)src), src, enc, rsapri, 
RSA_PKCS1_OAEP_PADDING)) < 0)
       {
             LogCryptError();
             return;
       }

       if ((result = RSA_public_decrypt(result, enc, dec, rsapub, 
RSA_PKCS1_OAEP_PADDING)) < 0)
       {
             LogCryptError();
             return;
       }

       RSA_free(rsa);
       RSA_free(rsapub);
       RSA_free(rsapri);

       return;
}

Where is my fault? Please help.

Robert