ENGINE_load_private_key does not get invoked

[Mahendra SP]

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