/********************************************************************************/
/*										*/
/*			   TPM DES Support	  				*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: TpmToOsslDesSupport.c 1476 2019-06-10 19:32:03Z kgoldman $	*/
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/* B.2.3.1. TpmToOsslDesSupport.c */
/* B.2.3.1.1. Introduction */
/* The functions in this file are used for initialization of the interface to the OpenSSL
   library. */
/* B.2.3.1.2. Defines and Includes */
#include "Tpm.h"
#if (defined SYM_LIB_OSSL) && ALG_TDES
/*     B.2.3.1.3. Functions */
/* B.2.3.1.3.1. TDES_set_encyrpt_key() */
/* This function makes creation of a TDES key look like the creation of a key for any of the other
   OpenSSL block ciphers. It will create three key schedules, one for each of the DES keys. If
   there are only two keys, then the third schedule is a copy of the first. */
void
TDES_set_encrypt_key(
		     const BYTE                  *key,
		     UINT16                       keySizeInBits,
		     tpmKeyScheduleTDES          *keySchedule
		     )
{
    DES_set_key_unchecked((const_DES_cblock *)key, &keySchedule[0]);
    DES_set_key_unchecked((const_DES_cblock *)&key[8], &keySchedule[1]);
    // If is two-key, copy the schedule for K1 into K3, otherwise, compute the
    // the schedule for K3
    if(keySizeInBits == 128)
	keySchedule[2] = keySchedule[0];
    else
	DES_set_key_unchecked((const_DES_cblock *)&key[16],
			      &keySchedule[2]);
}
/* B.2.3.1.3.2. TDES_encyrpt() */
/* The TPM code uses one key schedule. For TDES, the schedule contains three schedules. OpenSSL
   wants the schedules referenced separately. This function does that. */
void TDES_encrypt(
		  const BYTE              *in,
		  BYTE                    *out,
		  tpmKeyScheduleTDES      *ks
		  )
{
    DES_ecb3_encrypt((const_DES_cblock *)in, (DES_cblock *)out,
		     &ks[0], &ks[1], &ks[2],
		     DES_ENCRYPT);
}
/* B.2.3.1.3.3. TDES_decrypt() */
/* As with TDES_encypt() this function bridges between the TPM single schedule model and the
   OpenSSL three schedule model. */
void TDES_decrypt(
		  const BYTE          *in,
		  BYTE                *out,
		  tpmKeyScheduleTDES   *ks
		  )
{
    DES_ecb3_encrypt((const_DES_cblock *)in, (DES_cblock *)out,
		     &ks[0], &ks[1], &ks[2],
		     DES_DECRYPT);
}
#endif // SYM_LIB_OSSL
