$ p11tool --list-token-urls
pkcs11:model=p11-kit-trust;manufacturer=PKCS%2311%20Kit;serial=1;token=Default%20Trust
pkcs11:model=p11-kit-trust;manufacturer=PKCS%2311%20Kit;serial=1;token=System%20Trust
pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=00000xxxxxxxxxxxxxxxxxxx
pkcs11:model=PKCS%2315%20emulated;manufacturer=piv_II;serial=d6c523c6b0054a64;token=xxxxxxxxxxxx
$ p11tool --list-all "pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001"
Object 0:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%00%00%00%00%00%00%00%00;object=Certificate%20For%20PIV%20Authentication%20%28xxxxxxxxxxxx%29;type=cert
	Type: X.509 Certificate
	Label: Certificate For PIV Authentication (xxxxxxxxxxxxxx)
	ID: 00:00:00:00:00:00:00:00

Object 1:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%00%00%00%00%00%00%00%00;type=private
	Type: Private key
	Label: 
	Flags: CKA_PRIVATE; 
	ID: 00:00:00:00:00:00:00:00

Object 2:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%01%00%00%00%00%00%00%00;object=Certificate%20For%20Card%20Authentication%20%28xxxxxxxxxxxxxx;type=cert
	Type: X.509 Certificate
	Label: Certificate For Card Authentication (xxxxxxxxxxxxx)
	ID: 01:00:00:00:00:00:00:00

Object 3:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%01%00%00%00%00%00%00%00;type=private
	Type: Private key
	Label: 
	Flags: CKA_PRIVATE; 
	ID: 01:00:00:00:00:00:00:00

Object 4:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%02%00%00%00%00%00%00%00;object=Certificate%20For%20Digital%20Signature%20%28xxxxxxxxxxxxxxxxxxxx;type=cert
	Type: X.509 Certificate
	Label: Certificate For Digital Signature (xxxxxxxxxxxx)
	ID: 02:00:00:00:00:00:00:00

Object 5:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%02%00%00%00%00%00%00%00;type=private
	Type: Private key
	Label: 
	Flags: CKA_PRIVATE; 
	ID: 02:00:00:00:00:00:00:00

Object 6:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%03%00%00%00%00%00%00%00;object=Certificxxxxxxxxxxxxxxxxxxxxxxxxxxxx;type=cert
	Type: X.509 Certificate
	Label: Certificate For Key Management (xxxxxxxxxxxx)
	ID: 03:00:00:00:00:00:00:00

Object 7:
	URL: pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%03%00%00%00%00%00%00%00;type=private
	Type: Private key
	Label: 
	Flags: CKA_PRIVATE; 
	ID: 03:00:00:00:00:00:00:00

$ openssl dgst -engine pkcs11 -keyform engine -sign "pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%02%00%00%00%00%00%00%00;type=private" -sha256 -out /tmp/d.sig /tmp/d.dat
engine "pkcs11" set.
PKCS11_get_private_key returned NULL
cannot load key file from engine
140735945642952:error:8206F012:PKCS#11 module:pkcs11_getattr_int:Attribute type invalid:p11_attr.c:48:
140735945642952:error:26096080:engine routines:ENGINE_load_private_key:failed loading private key:eng_pkey.c:124:
unable to load key file
$
$ openssl dgst -engine pkcs11 -keyform engine -sign "pkcs11:model=Unknown%20Model;manufacturer=Unknown%20Manufacturer;serial=000001;id=%02%00%00%00%00%00%00%00;type=private" -sha256 -out /tmp/d.sig /tmp/d.dat


*************** OpenSC PKCS#11 spy *****************
Loaded: "/usr/local/lib/keychain-pkcs11.dylib"

0: C_GetFunctionList
2018-09-25 20:08:20.258
Returned:  0 CKR_OK

1: C_Initialize
2018-09-25 20:08:20.264
[in] pInitArgs = 0x7fb0014064d0
     flags: 2
       CKF_OS_LOCKING_OK
Returned:  0 CKR_OK

2: C_GetSlotList
2018-09-25 20:08:20.574
[in] tokenPresent = 0x0
[out] pSlotList: 
Count is 1
[out] *pulCount = 0x1
Returned:  0 CKR_OK

3: C_GetSlotList
2018-09-25 20:08:20.761
[in] tokenPresent = 0x0
[out] pSlotList: 
Slot 1
[out] *pulCount = 0x1
Returned:  0 CKR_OK

4: C_GetSlotInfo
2018-09-25 20:08:20.763
[in] slotID = 0x1
[out] pInfo: 
      slotDescription:        'Certificate For PIV Authenticati'
                              'on xxxxxxxxxxxxxxxxxxxxxxxxxxx  '
      manufacturerID:         'U.S. Naval Research Lab         '
      hardwareVersion:         1.0
      firmwareVersion:         1.0
      flags:                   7
        CKF_TOKEN_PRESENT                
        CKF_REMOVABLE_DEVICE             
        CKF_HW_SLOT                      
Returned:  0 CKR_OK

5: C_GetTokenInfo
2018-09-25 20:08:20.763
[in] slotID = 0x1
[out] pInfo: 
      label:                  'xxxxxxxxxxxxxxxxxxxxxxxxxxx     '
      manufacturerID:         'Unknown Manufacturer            '
      model:                  'Unknown Model   '
      serialNumber:           '000001          '
      ulMaxSessionCount:       0
      ulSessionCount:          -1
      ulMaxRwSessionCount:     0
      ulRwSessionCount:        0
      ulMaxPinLen:             255
      ulMinPinLen:             1
      ulTotalPublicMemory:     -1
      ulFreePublicMemory:      -1
      ulTotalPrivateMemory:    -1
      ulFreePrivateMemory:     -1
      hardwareVersion:         1.0
      firmwareVersion:         1.0
      time:                   '1970010100000000'
      flags:                   50e
        CKF_WRITE_PROTECTED              
        CKF_LOGIN_REQUIRED               
        CKF_USER_PIN_INITIALIZED         
        CKF_PROTECTED_AUTHENTICATION_PATH
        CKF_TOKEN_INITIALIZED            
Returned:  0 CKR_OK
engine "pkcs11" set.

6: C_OpenSession
2018-09-25 20:08:20.772
[in] slotID = 0x1
[in] flags = 0x4
pApplication=0x0
Notify=0x0
[out] *phSession = 0x1
Returned:  0 CKR_OK

7: C_FindObjectsInit
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] pTemplate[1]: 
    CKA_CLASS             CKO_PRIVATE_KEY      
Returned:  0 CKR_OK

8: C_FindObjects
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x3 matches
Returned:  0 CKR_OK

9: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

10: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID

11: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_ID                0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_ID                0000000000000000 / 8
Returned:  0 CKR_OK

12: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_ID                00007fb001612a40 / 8
[out] pTemplate[1]: 
    CKA_ID                00007fb001612a40 / 8
    00000000  00 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

13: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_ID                00007fb00160a291 / 255
[out] pTemplate[1]: 
    CKA_ID                00007fb00160a291 / 8
    00000000  00 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

14: C_FindObjects
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x6 matches
Returned:  0 CKR_OK

15: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

16: C_GetAttributeValue
2018-09-25 20:08:20.772
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID

17: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_ID                0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_ID                0000000000000000 / 8
Returned:  0 CKR_OK

18: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_ID                00007fb0014584a0 / 8
[out] pTemplate[1]: 
    CKA_ID                00007fb0014584a0 / 8
    00000000  01 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

19: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_ID                00007fb00143d2e1 / 255
[out] pTemplate[1]: 
    CKA_ID                00007fb00143d2e1 / 8
    00000000  01 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

20: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x9 matches
Returned:  0 CKR_OK

21: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

22: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID

23: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_ID                0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_ID                0000000000000000 / 8
Returned:  0 CKR_OK

24: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_ID                00007fb001458270 / 8
[out] pTemplate[1]: 
    CKA_ID                00007fb001458270 / 8
    00000000  02 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

25: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_ID                00007fb001440c81 / 255
[out] pTemplate[1]: 
    CKA_ID                00007fb001440c81 / 8
    00000000  02 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

26: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0xc matches
Returned:  0 CKR_OK

27: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

28: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_LABEL             0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID

29: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_ID                0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_ID                0000000000000000 / 8
Returned:  0 CKR_OK

30: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_ID                00007fb001458150 / 8
[out] pTemplate[1]: 
    CKA_ID                00007fb001458150 / 8
    00000000  03 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

31: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_ID                00007fb0014660b1 / 255
[out] pTemplate[1]: 
    CKA_ID                00007fb0014660b1 / 8
    00000000  03 00 00 00 00 00 00 00                          ........        
Returned:  0 CKR_OK

32: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x0
Returned:  0 CKR_OK

33: C_FindObjectsFinal
2018-09-25 20:08:20.773
[in] hSession = 0x1
Returned:  0 CKR_OK

34: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_MODULUS           0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_MODULUS           0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID

35: C_GetSessionInfo
2018-09-25 20:08:20.773
[in] hSession = 0x1
[out] pInfo: 
      slotID:                  1
      state:                  '           CKS_RO_PUBLIC_SESSION'
      flags:                   4
        CKF_SERIAL_SESSION               
      ulDeviceError:           0
Returned:  0 CKR_OK

36: C_Login
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] userType = CKU_USER
[in] pPin[ulPinLen] NULL [size : 0x0 (0)]
Returned:  0 CKR_OK

37: C_FindObjectsInit
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] pTemplate[1]: 
    CKA_CLASS             CKO_PRIVATE_KEY      
Returned:  0 CKR_OK

38: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x3 matches
Returned:  0 CKR_OK

39: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x3
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

40: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x6 matches
Returned:  0 CKR_OK

41: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x6
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

42: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0x9 matches
Returned:  0 CKR_OK

43: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

44: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x1
Object 0xc matches
Returned:  0 CKR_OK

45: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0xc
[in] pTemplate[1]: 
    CKA_KEY_TYPE          00007ffeeb502128 / 8
[out] pTemplate[1]: 
    CKA_KEY_TYPE          CKK_RSA            
Returned:  0 CKR_OK

46: C_FindObjects
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] ulMaxObjectCount = 0x1
[out] ulObjectCount = 0x0
Returned:  0 CKR_OK

47: C_FindObjectsFinal
2018-09-25 20:08:20.773
[in] hSession = 0x1
Returned:  0 CKR_OK

48: C_GetAttributeValue
2018-09-25 20:08:20.773
[in] hSession = 0x1
[in] hObject = 0x9
[in] pTemplate[1]: 
    CKA_MODULUS           0000000000000000 / 0
[out] pTemplate[1]: 
    CKA_MODULUS           0000000000000000 / 18446744073709551615
Returned:  18 CKR_ATTRIBUTE_TYPE_INVALID
PKCS11_get_private_key returned NULL
cannot load key file from engine
140735945642952:error:8206F012:PKCS#11 module:pkcs11_getattr_int:Attribute type invalid:p11_attr.c:48:
140735945642952:error:26096080:engine routines:ENGINE_load_private_key:failed loading private key:eng_pkey.c:124:
unable to load key file
$