/********************************************************************************/
/*										*/
/*		Implementation of the symmetric block cipher modes 		*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: CryptSym.h 1658 2021-01-22 23:14:01Z kgoldman $		*/
/*										*/
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/********************************************************************************/


#ifndef CRYPTSYM_H
#define CRYPTSYM_H

#if ALG_AES
#   define IF_IMPLEMENTED_AES(op)    op(AES, aes)
#else
#   define IF_IMPLEMENTED_AES(op)
#endif
#if ALG_SM4
#   define IF_IMPLEMENTED_SM4(op)    op(SM4, sm4)
#else
#   define IF_IMPLEMENTED_SM4(op)
#endif
#if ALG_CAMELLIA
#   define IF_IMPLEMENTED_CAMELLIA(op)    op(CAMELLIA, camellia)
#else
#   define IF_IMPLEMENTED_CAMELLIA(op)
#endif
#if ALG_TDES
#   define IF_IMPLEMENTED_TDES(op)    op(TDES, tdes)
#else
#   define IF_IMPLEMENTED_TDES(op)
#endif

#define FOR_EACH_SYM(op)		\
    IF_IMPLEMENTED_AES(op)		\
    IF_IMPLEMENTED_SM4(op)		\
    IF_IMPLEMENTED_CAMELLIA(op)		\
    IF_IMPLEMENTED_TDES(op)

/* Macros for creating the key schedule union */

#define     KEY_SCHEDULE(SYM, sym)      tpmKeySchedule##SYM sym;
#define     TDES    DES[3]
typedef union tpmCryptKeySchedule_t {
    FOR_EACH_SYM(KEY_SCHEDULE)

#if SYMMETRIC_ALIGNMENT == 8
    uint64_t            alignment;
#else
    uint32_t            alignment;
#endif
} tpmCryptKeySchedule_t;

/* Each block cipher within a library is expected to conform to the same calling conventions with
   three parameters (keySchedule, in, and out) in the same order. That means that all algorithms
   would use the same order of the same parameters. The code is written assuming the (keySchedule,
   in, and out) order. However, if the library uses a different order, the order can be changed with
   a SWIZZLE macro that puts the parameters in the correct order. Note that all algorithms have to
   use the same order and number of parameters because the code to build the calling list is common
   for each call to encrypt or decrypt with the algorithm chosen by setting a function pointer to
   select the algorithm that is used. */
#   define ENCRYPT(keySchedule, in, out)	\
    encrypt(SWIZZLE(keySchedule, in, out))
#   define DECRYPT(keySchedule, in, out)	\
    decrypt(SWIZZLE(keySchedule, in, out))

/* Note that the macros rely on encrypt as local values in the functions that use these
   macros. Those parameters are set by the macro that set the key schedule to be used for the
   call. */

#define ENCRYPT_CASE(ALG, alg)						\
    case TPM_ALG_##ALG:							\
    TpmCryptSetEncryptKey##ALG(key, keySizeInBits, &keySchedule.alg);	\
    encrypt = (TpmCryptSetSymKeyCall_t)TpmCryptEncrypt##ALG;		\
    break;
#define DECRYPT_CASE(ALG, alg)						\
    case TPM_ALG_##ALG:							\
    TpmCryptSetDecryptKey##ALG(key, keySizeInBits, &keySchedule.alg);	\
    decrypt = (TpmCryptSetSymKeyCall_t)TpmCryptDecrypt##ALG;		\
    break;

#endif