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/*
 * COPYRIGHT (c) International Business Machines Corp. 2016-2017
 *
 * This program is provided under the terms of the Common Public License,
 * version 1.0 (CPL-1.0). Any use, reproduction or distribution for this
 * software constitutes recipient's acceptance of CPL-1.0 terms which can be
 * found in the file LICENSE file or at
 * https://opensource.org/licenses/cpl1.0.php
 */

typedef CK_RV (*m_GenerateRandom_t) (CK_BYTE_PTR rnd, CK_ULONG len,
                                     target_t target);
typedef CK_RV (*m_SeedRandom_t) (CK_BYTE_PTR pSeed, CK_ULONG ulSeedLen,
                                 target_t target);
typedef CK_RV (*m_Digest_t) (const unsigned char *state, size_t slen,
                             CK_BYTE_PTR data, CK_ULONG len,
                             CK_BYTE_PTR digest, CK_ULONG_PTR dglen,
                             target_t target);
typedef CK_RV (*m_DigestInit_t) (unsigned char *state, size_t * len,
                                 const CK_MECHANISM_PTR pmech,
                                 target_t target);
typedef CK_RV (*m_DigestUpdate_t) (unsigned char *state, size_t slen,
                                   CK_BYTE_PTR data, CK_ULONG dlen,
                                   target_t target);
typedef CK_RV (*m_DigestKey_t) (unsigned char *state, size_t slen,
                                const unsigned char *key, size_t klen,
                                target_t target);
typedef CK_RV (*m_DigestFinal_t) (const unsigned char *state,
                                  size_t slen, CK_BYTE_PTR digest,
                                  CK_ULONG_PTR dlen, target_t target);
typedef CK_RV (*m_DigestSingle_t) (CK_MECHANISM_PTR pmech,
                                   CK_BYTE_PTR data, CK_ULONG len,
                                   CK_BYTE_PTR digest, CK_ULONG_PTR dlen,
                                   target_t target);
typedef CK_RV (*m_EncryptInit_t) (unsigned char *state, size_t * slen,
                                  CK_MECHANISM_PTR pmech,
                                  const unsigned char *key, size_t klen,
                                  target_t target);
typedef CK_RV (*m_DecryptInit_t) (unsigned char *state, size_t * slen,
                                  CK_MECHANISM_PTR pmech,
                                  const unsigned char *key, size_t klen,
                                  target_t target);
typedef CK_RV (*m_EncryptUpdate_t) (unsigned char *state, size_t slen,
                                    CK_BYTE_PTR plain, CK_ULONG plen,
                                    CK_BYTE_PTR cipher,
                                    CK_ULONG_PTR clen, target_t target);
typedef CK_RV (*m_DecryptUpdate_t) (unsigned char *state, size_t slen,
                                    CK_BYTE_PTR cipher, CK_ULONG clen,
                                    CK_BYTE_PTR plain, CK_ULONG_PTR plen,
                                    target_t target);
typedef CK_RV (*m_Encrypt_t) (const unsigned char *state, size_t slen,
                              CK_BYTE_PTR plain, CK_ULONG plen,
                              CK_BYTE_PTR cipher, CK_ULONG_PTR clen,
                              target_t target);
typedef CK_RV (*m_Decrypt_t) (const unsigned char *state, size_t slen,
                              CK_BYTE_PTR cipher, CK_ULONG clen,
                              CK_BYTE_PTR plain, CK_ULONG_PTR plen,
                              target_t target);
typedef CK_RV (*m_EncryptFinal_t) (const unsigned char *state,
                                   size_t slen, CK_BYTE_PTR output,
                                   CK_ULONG_PTR len, target_t target);
typedef CK_RV (*m_DecryptFinal_t) (const unsigned char *state,
                                   size_t slen, CK_BYTE_PTR output,
                                   CK_ULONG_PTR len, target_t target);
typedef CK_RV (*m_EncryptSingle_t) (const unsigned char *key,
                                    size_t klen, CK_MECHANISM_PTR mech,
                                    CK_BYTE_PTR plain, CK_ULONG plen,
                                    CK_BYTE_PTR cipher,
                                    CK_ULONG_PTR clen, target_t target);
typedef CK_RV (*m_DecryptSingle_t) (const unsigned char *key,
                                    size_t klen, CK_MECHANISM_PTR mech,
                                    CK_BYTE_PTR cipher, CK_ULONG clen,
                                    CK_BYTE_PTR plain, CK_ULONG_PTR plen,
                                    target_t target);
typedef CK_RV (*m_ReencryptSingle_t) (const unsigned char *dkey,
                                      size_t dklen,
                                      const unsigned char *ekey,
                                      size_t eklen,
                                      CK_MECHANISM_PTR pdecrmech,
                                      CK_MECHANISM_PTR pencrmech,
                                      CK_BYTE_PTR in, CK_ULONG ilen,
                                      CK_BYTE_PTR out, CK_ULONG_PTR olen,
                                      target_t target);
typedef CK_RV (*m_GenerateKey_t) (CK_MECHANISM_PTR pmech,
                                  CK_ATTRIBUTE_PTR ptempl,
                                  CK_ULONG templcount,
                                  const unsigned char *pin,
                                  size_t pinlen, unsigned char *key,
                                  size_t * klen, unsigned char *csum,
                                  size_t * clen, target_t target);
typedef CK_RV (*m_GenerateKeyPair_t) (CK_MECHANISM_PTR pmech,
                                      CK_ATTRIBUTE_PTR ppublic,
                                      CK_ULONG pubattrs,
                                      CK_ATTRIBUTE_PTR pprivate,
                                      CK_ULONG prvattrs,
                                      const unsigned char *pin,
                                      size_t pinlen, unsigned char *key,
                                      size_t * klen,
                                      unsigned char *pubkey,
                                      size_t * pklen, target_t target);
typedef CK_RV (*m_SignInit_t) (unsigned char *state, size_t * slen,
                               CK_MECHANISM_PTR alg,
                               const unsigned char *key, size_t klen,
                               target_t target);
typedef CK_RV (*m_VerifyInit_t) (unsigned char *state, size_t * slen,
                                 CK_MECHANISM_PTR alg,
                                 const unsigned char *key, size_t klen,
                                 target_t target);
typedef CK_RV (*m_SignUpdate_t) (unsigned char *state, size_t slen,
                                 CK_BYTE_PTR data, CK_ULONG dlen,
                                 target_t target);
typedef CK_RV (*m_VerifyUpdate_t) (unsigned char *state, size_t slen,
                                   CK_BYTE_PTR data, CK_ULONG dlen,
                                   target_t target);
typedef CK_RV (*m_SignFinal_t) (const unsigned char *state, size_t stlen,
                                CK_BYTE_PTR sig, CK_ULONG_PTR siglen,
                                target_t target);
typedef CK_RV (*m_VerifyFinal_t) (const unsigned char *state,
                                  size_t stlen, CK_BYTE_PTR sig,
                                  CK_ULONG siglen, target_t target);
typedef CK_RV (*m_Sign_t) (const unsigned char *state, size_t stlen,
                           CK_BYTE_PTR data, CK_ULONG dlen,
                           CK_BYTE_PTR sig, CK_ULONG_PTR siglen,
                            target_t target);
typedef CK_RV (*m_Verify_t) (const unsigned char *state, size_t stlen,
                             CK_BYTE_PTR data, CK_ULONG dlen,
                             CK_BYTE_PTR sig, CK_ULONG siglen,
                             target_t target);
typedef CK_RV (*m_SignSingle_t) (const unsigned char *key, size_t klen,
                                 CK_MECHANISM_PTR pmech,
                                 CK_BYTE_PTR data, CK_ULONG dlen,
                                 CK_BYTE_PTR sig, CK_ULONG_PTR slen,
                                 target_t target);
typedef CK_RV (*m_VerifySingle_t) (const unsigned char *key, size_t klen,
                                   CK_MECHANISM_PTR pmech,
                                   CK_BYTE_PTR data, CK_ULONG dlen,
                                   CK_BYTE_PTR sig, CK_ULONG slen,
                                   target_t target);

/* mackey is NULL for PKCS#11 formats, not for authenticated ones */
typedef CK_RV (*m_WrapKey_t) (const unsigned char *key, size_t keylen,
                              const unsigned char *kek, size_t keklen,
                              const unsigned char *mackey, size_t mklen,
                              const CK_MECHANISM_PTR pmech,
                              CK_BYTE_PTR wrapped, CK_ULONG_PTR wlen,
                               target_t target);
 /**/
/* mackey is NULL for PKCS#11 formats, not for authenticated ones */
typedef CK_RV (*m_UnwrapKey_t) (const CK_BYTE_PTR wrapped, CK_ULONG wlen,
                                const unsigned char *kek, size_t keklen,
                                const unsigned char *mackey,
                                size_t mklen, const unsigned char *pin,
                                size_t pinlen,
                                const CK_MECHANISM_PTR uwmech,
                                const CK_ATTRIBUTE_PTR ptempl,
                                CK_ULONG pcount,
                                unsigned char *unwrapped, size_t * uwlen,
                                CK_BYTE_PTR csum, CK_ULONG * cslen,
                                target_t target);

typedef CK_RV (*m_DeriveKey_t) (CK_MECHANISM_PTR pderivemech,
                                CK_ATTRIBUTE_PTR ptempl,
                                CK_ULONG templcount,
                                const unsigned char *basekey,
                                size_t bklen,
                                const unsigned char *data, size_t dlen,
                                const unsigned char *pin, size_t pinlen,
                                unsigned char *newkey, size_t * nklen,
                                unsigned char *csum, size_t * cslen,
                                target_t target);

typedef CK_RV (*m_GetMechanismList_t) (CK_SLOT_ID slot,
                                       CK_MECHANISM_TYPE_PTR mechs,
                                       CK_ULONG_PTR count,
                                       target_t target);
typedef CK_RV (*m_GetMechanismInfo_t) (CK_SLOT_ID slot,
                                       CK_MECHANISM_TYPE mech,
                                       CK_MECHANISM_INFO_PTR pmechinfo,
                                       target_t target);
typedef CK_RV (*m_GetAttributeValue_t) (const unsigned char *obj,
                                        size_t olen,
                                        CK_ATTRIBUTE_PTR pTemplate,
                                        CK_ULONG ulCount,
                                        target_t target);
typedef CK_RV (*m_SetAttributeValue_t) (unsigned char *obj, size_t olen,
                                        CK_ATTRIBUTE_PTR pTemplate,
                                        CK_ULONG ulCount,
                                        target_t target);
typedef CK_RV (*m_Login_t) (CK_UTF8CHAR_PTR pin, CK_ULONG pinlen,
                            const unsigned char *nonce, size_t nlen,
                            unsigned char *pinblob, size_t * pinbloblen,
                            target_t target);
typedef CK_RV (*m_Logout_t) (const unsigned char *pin, size_t len,
                             target_t target);
typedef CK_RV (*m_admin_t) (unsigned char *response1, size_t * r1len,
                            unsigned char *response2, size_t * r2len,
                            const unsigned char *cmd, size_t clen,
                            const unsigned char *sigs, size_t slen,
                            target_t target);
typedef int (*m_add_backend_t) (const char *name, unsigned int port);
typedef int (*m_init_t) (void);
typedef int (*m_shutdown_t) (void);
typedef int (*m_add_module_t) (XCP_Module_t module, target_t *target);
typedef int (*m_rm_module_t) (XCP_Module_t module, target_t target);

#ifndef XCP_SERIALNR_CHARS
#define XCP_SERIALNR_CHARS        8
#endif
#ifndef XCP_ADMCTR_BYTES
#define XCP_ADMCTR_BYTES          ((size_t) (128/8))
#endif
#ifndef XCP_ADM_QUERY
#define XCP_ADM_QUERY              0x10000
#endif
#ifndef XCP_ADMQ_DOM_CTRLPOINTS
#define XCP_ADMQ_DOM_CTRLPOINTS    6 | XCP_ADM_QUERY    // domain CP
#endif

#ifndef __xcpadm_h__
typedef struct XCPadmresp {
    uint32_t fn;
    uint32_t domain;
    uint32_t domainInst;

    /* module ID || module instance */
    unsigned char module[XCP_SERIALNR_CHARS + XCP_SERIALNR_CHARS];
    unsigned char modNr[XCP_SERIALNR_CHARS];
    unsigned char modInst[XCP_SERIALNR_CHARS];

    unsigned char tctr[XCP_ADMCTR_BYTES];       /* transaction counter */

    CK_RV rv;
    uint32_t reason;

    // points to original response; NULL if no payload
    // make sure it's copied if used after releasing response block
    //
    const unsigned char *payload;
    size_t pllen;
} *XCPadmresp_t;
#endif

#ifndef XCP_CPB_ADD_CPBS
#define XCP_CPB_ADD_CPBS           0  // allow addition (activation) of CP bits
#define XCP_CPB_DELETE_CPBS        1  // allow removal (deactivation) of CP bits
                                      // remove both ADD_CPBs and DELETE_CPBs
                                      // to make unit read-only
#define XCP_CPB_SIGN_ASYMM         2  // sign with private keys
#define XCP_CPB_SIGN_SYMM          3  // sign with HMAC or CMAC
#define XCP_CPB_SIGVERIFY_SYMM     4  // verify with HMAC or CMAC
#define XCP_CPB_ENCRYPT_SYMM       5  // encrypt with symmetric keys
                                      // No asymmetric counterpart: one
                                      // may not restrict use of public keys
#define XCP_CPB_DECRYPT_ASYMM      6  // decrypt with private keys
#define XCP_CPB_DECRYPT_SYMM       7  // decrypt with symmetric keys
#define XCP_CPB_WRAP_ASYMM         8  // key export with public keys
#define XCP_CPB_WRAP_SYMM          9  // key export with symmetric keys
#define XCP_CPB_UNWRAP_ASYMM       10 // key import with private keys
#define XCP_CPB_UNWRAP_SYMM        11 // key import with symmetric keys
#define XCP_CPB_KEYGEN_ASYMM       12 // generate asymmetric keypairs
#define XCP_CPB_KEYGEN_SYMM        13 // generate or derive symmetric keys
                                      // including DSA parameters
#define XCP_CPB_RETAINKEYS         14 // allow backend to save semi/retained
                                      // keys
#define XCP_CPB_SKIP_KEYTESTS      15 // disable selftests on new asymmetric
                                      // keys
#define XCP_CPB_NON_ATTRBOUND      16 // allow keywrap without attribute-binding
#define XCP_CPB_MODIFY_OBJECTS     17 // allow changes to objects
                                      // (Booleans only)
#define XCP_CPB_RNG_SEED           18 // allow mixing external seed to RNG
#define XCP_CPB_ALG_RAW_RSA        19 // allow RSA private-key use without
                                      // padding (highly discouraged)
#define XCP_CPB_ALG_NFIPS2009      20 // allow non-FIPS-approved algs
                                      // (as of 2009)
                                      // including non-FIPS keysizes
#define XCP_CPB_ALG_NBSI2009       21 // allow non-BSI algorithms (as of 2009)
                                      // including non-FIPS keysizes
#define XCP_CPB_KEYSZ_HMAC_ANY     22 // don't enforce minimum keysize on HMAC
#define XCP_CPB_KEYSZ_BELOW80BIT   23 // allow algorithms below 80-bit strength
                                      // public-key operations are still allowed
#define XCP_CPB_KEYSZ_80BIT        24 // allow 80 to 111-bit algorithms
#define XCP_CPB_KEYSZ_112BIT       25 // allow 112 to 127-bit algorithms
#define XCP_CPB_KEYSZ_128BIT       26 // allow 128 to 191-bit algorithms
#define XCP_CPB_KEYSZ_192BIT       27 // allow 192 to 255-bit algorithms
#define XCP_CPB_KEYSZ_256BIT       28 // allow 256-bit algorithms
#define XCP_CPB_KEYSZ_RSA65536     29 // allow RSA public exponents below
                                      // 0x10001
#define XCP_CPB_ALG_RSA            30 // RSA private-key or key-encrypt use
#define XCP_CPB_ALG_DSA            31 // DSA private-key use
#define XCP_CPB_ALG_EC             32 // EC private-key use, see also
                                      // curve restrictions
#define XCP_CPB_ALG_EC_BPOOLCRV    33 // Brainpool (E.U.) EC curves
#define XCP_CPB_ALG_EC_NISTCRV     34 // NIST/SECG EC curves
#define XCP_CPB_ALG_NFIPS2011      35 // allow non-FIPS-approved algs
                                      // (as of 2011)
                                      // including non-FIPS keysizes
#define XCP_CPB_ALG_NBSI2011       36 // allow non-BSI algorithms (as of 2011)
                                      // including non-BSI keysizes
#define XCP_CPB_USER_SET_TRUSTED   37 // allow non-admins to set TRUSTED on a
                                      // blob/SPKI
#define XCP_CPB_ALG_SKIP_CROSSCHK  38 // do not double-check sign/decrypt ops
#define XCP_CPB_WRAP_CRYPT_KEYS    39 // allow keys which can en/decrypt data
                                      // and also un/wrap other keys
#define XCP_CPB_SIGN_CRYPT_KEYS    40 // allow keys which can en/decrypt data
                                      // and also sign/verify
#define XCP_CPB_WRAP_SIGN_KEYS     41 // allow keys which can un/wrap data
                                      // and also sign/verify
#define XCP_CPB_USER_SET_ATTRBOUND 42 // allow non-administrators to
                                      // Wire format 69/82
                                      // mark public key objects ATTRBOUND
#define XCP_CPB_ALLOW_PASSPHRASE   43 // allow host to pass passprases, such as
                                      // PKCS12 data, in the clear
#define XCP_CPB_WRAP_STRONGER_KEY  44 // allow wrapping of stronger keys
                                      // by weaker keys
#define XCP_CPB_WRAP_WITH_RAW_SPKI 45 // allow wrapping with SPKIs without
                                      // MAC and attributes
#define XCP_CPB_ALG_DH             46 // Diffie-Hellman use (private keys)
#define XCP_CPB_DERIVE             47 // allow key derivation (symmetric+EC/DH)
#define XCP_CPB_ALG_EC_25519       55 // enable support of curve25519, c41417,
                                      // c448 and related algorithms incl. EdDSA
#define XCP_CPB_ALG_NBSI2017       61 // allow non-BSI algorithms (as of 2017)
                                      // including non-BSI keysizes
#define XCP_CPB_CPACF_PK           64 // support data key generation and import
                                      // for protected key
#define XCP_CPB_ALG_PQC_DILITHIUM  65 // enable support for Dilithium algorithm

#define XCP_CPBITS_MAX             XCP_CPB_ALG_PQC_DILITHIUM // marks last used CPB

#define  XCP_CPBLOCK_BITS          128 // handle CPs in this granularity
#define  XCP_CPCOUNT                \
        (((XCP_CPBITS_MAX + XCP_CPBLOCK_BITS-1) / XCP_CPBLOCK_BITS) * \
         XCP_CPBLOCK_BITS)
#define  XCP_CP_BYTES     (XCP_CPCOUNT / 8)   // full blocks, incl. unused bits

#endif

typedef long (*xcpa_queryblock_t) (unsigned char *blk, size_t blen,
                                   unsigned int fn, uint64_t domain,
                                   const unsigned char *payload, size_t plen);
typedef long (*xcpa_internal_rv_t) (const unsigned char *rsp, size_t rlen,
                                    struct XCPadmresp * rspblk, CK_RV * rv);

typedef CK_RV (*m_get_xcp_info_t)(CK_VOID_PTR pinfo, CK_ULONG_PTR infbytes,
                                unsigned int query, unsigned int subquery,
                                target_t target);

#ifndef CK_IBM_XCP_HOSTQ_IDX

typedef enum {
    CK_IBM_XCPQ_API         =  0,  /* API and build identifier     */
    CK_IBM_XCPQ_MODULE      =  1,  /* module-level information     */
    CK_IBM_XCPQ_DOMAINS     =  2,  /* list active domains & WK IDs */
    CK_IBM_XCPQ_DOMAIN      =  3,
    CK_IBM_XCPQ_SELFTEST    =  4,  /* integrity & algorithm tests  */
    CK_IBM_XCPQ_EXT_CAPS    =  5,  /* extended capabilities, count */
    CK_IBM_XCPQ_EXT_CAPLIST =  6,  /* extended capabilities, list  */
    CK_IBM_XCPQ_AUDITLOG    =  8,  /* audit record or records      */
    CK_IBM_XCPQ_DESCRTEXT   =  9,  /* human-readable text/tokens   */
    CK_IBM_XCPQ_EC_CURVES   = 10,  /* supported elliptic curves    */
    CK_IBM_XCPQ_COMPAT      = 11,  /* domains' compatibility modes */
    CK_IBM_XCPQ_MAX         = CK_IBM_XCPQ_COMPAT
} CK_IBM_XCPQUERY_t;

#define CK_IBM_XCP_HOSTQ_IDX  0xff000000  /* host-only queries index, min. */
typedef enum {
    CK_IBM_XCPHQ_COUNT    = (int)0xff000000, /* number of host-query indexes */
                                             /* including this type itself   */
    CK_IBM_XCPHQ_VERSION  = (int)0xff000001, /* host-specific package version*/
                                             /* such as packaging library ID */
    CK_IBM_XCPHQ_VERSION_HASH
                          = (int)0xff000002, /* Assumed-unique identifier of */
                                             /* host code, such as version-  */
                                             /* identifying cryptographic    */
					     /* hash (library signature      */
                                             /* field...)                    */
    CK_IBM_XCPHQ_DIAGS    = (int)0xff000003, /* Host code diagnostic level.  */
                                             /* 0 if non-diagnostics host    */
					     /* code.                        */
    CK_IBM_XCPHQ_HVERSION = (int)0xff000004, /* Human-readable host version  */
                                             /* identification (recommended: */
                                             /* UTF-8 string)                */
    CK_IBM_XCPHQ_TGT_MODE = (int)0xff000005, /* Host targeting modes         */
                                             /* returns supported target     */
                                             /* modes as bitmask.            */
                                             /* If not available only        */
                                             /* compat target mode is in     */
                                             /* use. See                     */
                                             /* CK_IBM_XCPHQ_TGT_MODES_t.    */
    CK_IBM_XCPHQ_MAX = CK_IBM_XCPHQ_TGT_MODE
} CK_IBM_XCPHQUERY_t;

typedef struct CK_IBM_XCPAPI_INFO {
    CK_ULONG firmwareApi;
    CK_ULONG firmwareConfig;          /* truncated firmware hash */
} CK_IBM_XCPAPI_INFO;

typedef CK_IBM_XCPAPI_INFO    CK_PTR   CK_IBM_XCPAPI_INFO_PTR;

typedef struct CK_IBM_XCP_INFO {
    CK_ULONG   firmwareApi;         /* API ordinal number */
                                    /* major+minor pairs  */
    CK_ULONG   firmwareId;          /* truncated firmwareConfig */

    CK_VERSION firmwareVersion;     /* xcp only, matches xcpConfig below */
    CK_VERSION cspVersion;

                                    /* hashes, possibly truncated */
    CK_BYTE    firmwareConfig[ 32 ];
    CK_BYTE    xcpConfig     [ 32 ];
    CK_BYTE    cspConfig     [ 32 ];

    CK_CHAR    serialNumber[ 16 ];    /* device || instance */
    CK_CHAR    utcTime     [ 16 ];

    CK_ULONG   opMode2;               /* currently, reserved 0        */
    CK_ULONG   opMode1;               /* operational mode, card-level */

    CK_FLAGS   flags;               /*     PKCS#11 capabilities */
    CK_FLAGS   extflags;            /* non-PKCS#11 capabilities */

    CK_ULONG   domains;
    CK_ULONG   symmStateBytes;
    CK_ULONG digestStateBytes;
    CK_ULONG    pinBlockBytes;
    CK_ULONG     symmKeyBytes;
    CK_ULONG        spkiBytes;
    CK_ULONG      prvkeyBytes;

    CK_ULONG  maxPayloadBytes;
    CK_ULONG   cpProfileBytes;
    CK_ULONG    controlPoints;
} CK_IBM_XCP_INFO;

typedef CK_IBM_XCP_INFO    CK_PTR   CK_IBM_XCP_INFO_PTR;

#endif

#ifndef XCP_PINBLOB_BYTES
#define  XCP_HMAC_BYTES ((size_t) (256 /8))     /* SHA-256 */
#define  XCP_WK_BYTES   ((size_t) (256 /8))     /* keypart and session sizes  */
#define  MOD_WRAP_BLOCKSIZE ((size_t) (128 /8)) /* blob crypt block bytecount */
#define  XCP_PIN_SALT_BYTES  MOD_WRAP_BLOCKSIZE
#define  XCP_PINBLOB_BYTES  \
            (XCP_WK_BYTES + XCP_PIN_SALT_BYTES + XCP_HMAC_BYTES)
#define  XCP_MIN_PINBYTES          8
#define  XCP_MAX_PINBYTES         16
#endif