ENGINE_load_private_key does not get invoked

[Mahendra SP <mahendra.sp@xxxxxxxxx>]

Hi All,

While writing the engine implementation for private key encryption and decryption, I need to get the private key from external source. 

ENGINE_set_load_privkey_function(e, load_tpm_private_key)

Above API is success.

RSA structure is as below.

RSA_METHOD my_rsa_struct =
{
   "MY RSA method",
   NULL,
   NULL,
   MyRSAPrivEnc,
   MyRSAPrivDec,
   NULL, 
   NULL,
   NULL, 
   NULL,
   0, 
   NULL,
   NULL,
   NULL,
   NULL
};

However, the routine load_tpm_private_key  does not get invoked during private key encryption and decryption.

Private key encryption and decryption gets routed to the above overloaded routines namely " MyRSAPrivEnc " and " MyRSAPrivDec". But  load_tpm_private_key never gets invoked. 

Is there a flag  to force the same ? I have tried it using openssl 1.0.2 version. All other engine calls work as expected, but not this one. 

I have also tried to debug in ENGINE_load_private_key in eng_pkey.c file. I dont see this function getting invoked. In this function, the private key callback set above gets invoked.

 

Please suggest if I am missing something here.

Thanks

Mahendra