/********************************************************************************/
/*										*/
/*		DRBG with a behavior according to SP800-90A			*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: CryptRand.h 1047 2017-07-20 18:27:34Z kgoldman $		*/
/*										*/
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/********************************************************************************/

#ifndef CRYPTRAND_H
#define CRYPTRAND_H

/* 10.1.5 CryptRand.h */
/* 10.1.5.1 Introduction */
/* This file contains constant definition shared by CryptUtil() and the parts of the Crypto
   Engine. */
#ifndef _CRYPT_RAND_H
#define _CRYPT_RAND_H
/* DRBG Structures and Defines Values and structures for the random number generator. These values
   are defined in this header file so that the size of the RNG state can be known to TPM.lib. This
   allows the allocation of some space in NV memory for the state to be stored on an orderly
   shutdown. The DRBG based on a symmetric block cipher is defined by three values, */
/* a) the key size */
/* b) the block size (the IV size) */
/* c) the symmetric algorithm */
#define DRBG_KEY_SIZE_BITS MAX_AES_KEY_BITS
#define DRBG_IV_SIZE_BITS (MAX_AES_BLOCK_SIZE_BYTES * 8)
#define DRBG_ALGORITHM TPM_ALG_AES
typedef tpmKeyScheduleAES DRBG_KEY_SCHEDULE;
#define DRBG_ENCRYPT_SETUP(key, keySizeInBits, schedule)		\
    TpmCryptSetEncryptKeyAES(key, keySizeInBits, schedule)
#define DRBG_ENCRYPT(keySchedule, in, out)				\
    TpmCryptEncryptAES(SWIZZLE(keySchedule, in, out))
#if     ((DRBG_KEY_SIZE_BITS % RADIX_BITS) != 0)	\
    || ((DRBG_IV_SIZE_BITS % RADIX_BITS) != 0)
#error "Key size and IV for DRBG must be even multiples of the radix"
#endif
#if (DRBG_KEY_SIZE_BITS % DRBG_IV_SIZE_BITS) != 0
#error "Key size for DRBG must be even multiple of the cypher block size"
#endif
/*     Derived values */
#define DRBG_MAX_REQUESTS_PER_RESEED (1 << 48)
#define DRBG_MAX_REQEST_SIZE (1 << 32)
#define pDRBG_KEY(seed)    ((DRBG_KEY *)&(((BYTE *)(seed))[0]))
#define pDRBG_IV(seed)     ((DRBG_IV *)&(((BYTE *)(seed))[DRBG_KEY_SIZE_BYTES]))
#define DRBG_KEY_SIZE_WORDS     (BITS_TO_CRYPT_WORDS(DRBG_KEY_SIZE_BITS))
#define DRBG_KEY_SIZE_BYTES     (DRBG_KEY_SIZE_WORDS * RADIX_BYTES)
#define DRBG_IV_SIZE_WORDS      (BITS_TO_CRYPT_WORDS(DRBG_IV_SIZE_BITS))
#define DRBG_IV_SIZE_BYTES      (DRBG_IV_SIZE_WORDS * RADIX_BYTES)
#define DRBG_SEED_SIZE_WORDS    (DRBG_KEY_SIZE_WORDS + DRBG_IV_SIZE_WORDS)
#define DRBG_SEED_SIZE_BYTES    (DRBG_KEY_SIZE_BYTES + DRBG_IV_SIZE_BYTES)
typedef union
{
    BYTE            bytes[DRBG_KEY_SIZE_BYTES];
    crypt_uword_t   words[DRBG_KEY_SIZE_WORDS];
} DRBG_KEY;
typedef union
{
    BYTE            bytes[DRBG_IV_SIZE_BYTES];
    crypt_uword_t   words[DRBG_IV_SIZE_WORDS];
} DRBG_IV;
typedef union
{
    BYTE            bytes[DRBG_SEED_SIZE_BYTES];
    crypt_uword_t   words[DRBG_SEED_SIZE_WORDS];
} DRBG_SEED;
#define CTR_DRBG_MAX_REQUESTS_PER_RESEED        ((UINT64)1 << 20)
#define CTR_DRBG_MAX_BYTES_PER_REQUEST          (1 << 16)
#   define CTR_DRBG_MIN_ENTROPY_INPUT_LENGTH    DRBG_SEED_SIZE_BYTES
#   define CTR_DRBG_MAX_ENTROPY_INPUT_LENGTH    DRBG_SEED_SIZE_BYTES
#   define CTR_DRBG_MAX_ADDITIONAL_INPUT_LENGTH DRBG_SEED_SIZE_BYTES
#define     TESTING         (1 << 0)
#define     ENTROPY         (1 << 1)
#define     TESTED          (1 << 2)
#define     IsTestStateSet(BIT)    ((g_cryptoSelfTestState.rng & BIT) != 0)
#define     SetTestStateBit(BIT)   (g_cryptoSelfTestState.rng |= BIT)
#define     ClearTestStateBit(BIT) (g_cryptoSelfTestState.rng &= ~BIT)
#define     IsSelfTest()    IsTestStateSet(TESTING)
#define     SetSelfTest()   SetTestStateBit(TESTING)
#define     ClearSelfTest() ClearTestStateBit(TESTING)
#define     IsEntropyBad()      IsTestStateSet(ENTROPY)
#define     SetEntropyBad()     SetTestStateBit(ENTROPY)
#define     ClearEntropyBad()   ClearTestStateBit(ENTROPY)
#define     IsDrbgTested()      IsTestStateSet(TESTED)
#define     SetDrbgTested()     SetTestStateBit(TESTED)
#define     ClearDrbgTested()   ClearTestStateBit(TESTED)
    typedef struct
    {
	UINT64      reseedCounter;
	UINT32      magic;
	DRBG_SEED   seed; // contains the key and IV for the counter mode DRBG
	UINT32      lastValue[4];   // used when the TPM does continuous self-test
	// for FIPS compliance of DRBG
    } DRBG_STATE, *pDRBG_STATE;
#define DRBG_MAGIC   ((UINT32) 0x47425244) // "DRBG" backwards so that it displays
typedef struct
{
    UINT64               counter;
    UINT32               magic;
    UINT32               limit;
    TPM2B               *seed;
    const TPM2B         *label;
    TPM2B               *context;
    TPM_ALG_ID           hash;
    TPM_ALG_ID           kdf;
    UINT16               digestSize;
    TPM2B_DIGEST         residual;
} KDF_STATE, *pKDR_STATE;
#define KDF_MAGIC    ((UINT32) 0x4048444a) // "KDF " backwards
/* Make sure that any other structures added to this union start with a 64-bit counter and a 32-bit
   magic number */
typedef union
{
    DRBG_STATE      drbg;
    KDF_STATE       kdf;
} RAND_STATE;
/* This is the state used when the library uses a random number generator. A special function is
   installed for the library to call. That function picks up the state from this location and uses
   it for the generation of the random number. */
extern RAND_STATE           *s_random;
/* When instrumenting RSA key sieve */
#ifdef  RSA_INSTRUMENT
#define PRIME_INDEX(x)  ((x) == 512 ? 0 : (x) == 1024 ? 1 : 2)
#   define INSTRUMENT_SET(a, b) ((a) = (b))
#   define INSTRUMENT_ADD(a, b) (a) = (a) + (b)
#   define INSTRUMENT_INC(a)    (a) = (a) + 1
extern UINT32  PrimeIndex;
extern UINT32  failedAtIteration[10];
extern UINT32  PrimeCounts[3];
extern UINT32  MillerRabinTrials[3];
extern UINT32  totalFieldsSieved[3];
extern UINT32  bitsInFieldAfterSieve[3];
extern UINT32  emptyFieldsSieved[3];
extern UINT32  noPrimeFields[3];
extern UINT32  primesChecked[3];
extern UINT16  lastSievePrime;
#else
#   define INSTRUMENT_SET(a, b)
#   define INSTRUMENT_ADD(a, b)
#   define INSTRUMENT_INC(a)
#endif
#endif // _CRYPT_RAND_H


#endif
