Added pytss python tutorials for quote and get_random

PythonExamples/README.md

@@ -14,4 +14,5 @@ Each example can be run just by typing `python3 example.py`
 
 Each example has an accompanying description as markdown file, plus annotated code.
 
-   * [quote](quote.md)
+   * [randomnumber]
+   * [quote]

PythonExamples/quote.md

@@ -9,6 +9,10 @@ The code will:
    * request a quote using the given attestation key, pcrs and extradata
    * unmarshal the returned data structures and print these as a python dict and convert to JSON and pretty print
 
+then as a bonus example
+
+   * generate a random number from the TPM and use that as the extra data to the quote
+
 ## Setup and Variables
 
 The following code might need to be modified for you local setup
@@ -28,6 +32,8 @@ Errors might be generated as the pytss libraries search for a suitable TPM devic
 
 ## Example Output
 
+The following is example output:
+
 ```bash
 ~/tpm.dev.tutorials/PythonExamples$ python3 quote.py 
 ERROR:tcti:src/tss2-tcti/tcti-device.c:442:Tss2_Tcti_Device_Init() Failed to open specified TCTI device file /dev/tpmrm0: No such file or directory 
@@ -38,9 +44,9 @@ ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:222:tcti_control_command() Control command
 ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:330:tcti_swtpm_set_locality() Failed to set locality: 0xa000a 
 WARNING:tcti:src/tss2-tcti/tcti-swtpm.c:599:Tss2_Tcti_Swtpm_Init() Could not set locality via control channel: 0xa000a 
 ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-swtpm.so.0 
-att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f5fb10419d0>
+att= <tpm2_pytss.types.TPMS_ATTEST object at 0x7f0bebf19070>
 ae= <class 'dict'> 
- {'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 308418200, 'resetCount': 22, 'restartCount': 0, 'safe': 1}, 'extraData': '49616e3132333435', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
+ {'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 313399693, 'resetCount': 24, 'restartCount': 0, 'safe': 1}, 'extraData': '49616e3132333435', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
 
  {
     "attested": {
@@ -58,8 +64,8 @@ ae= <class 'dict'>
         ]
     },
     "clockInfo": {
-        "clock": 308418200,
+        "clock": 313399693,
-        "resetCount": 22,
+        "resetCount": 24,
         "restartCount": 0,
         "safe": 1
     },
@@ -73,4 +79,9 @@ ae= <class 'dict'>
     "type": "attest_quote"
 }
 
-```
+With randomly generated extra data:  0c830dd1a9dd50c0
+ae2= <class 'dict'> 
+ {'attested': {'pcrDigest': '38723a2e5e8a17aa7950dc008209944e898f69a7bd10a23c839d341e935fd5ca', 'pcrSelect': [{'hash': 'sha256', 'pcrSelect': [0, 1, 2, 3]}]}, 'clockInfo': {'clock': 313399694, 'resetCount': 24, 'restartCount': 0, 'safe': 1}, 'extraData': '30633833306464316139646435306330', 'firmwareVersion': [538513443, 1455670], 'magic': 4283712327, 'qualifiedSigner': '000bff3ea118be81e7f10ead098c900b93c885785e828bf27d824a87add847b5ec56', 'type': 'attest_quote'}
+```
+
+The *magic number* of the quote is returned as an integer `4283712327` this corresponds to the better known TPM returned byte sequence `FF544347` in hex.

PythonExamples/quote.py

@@ -67,7 +67,7 @@ print("att=",att)
 # We construct an encoder and encode that structure in a python dict
 #
 
-enc = json_encdec() 
+enc = json_encdec()
 ae = enc.encode(att)
 print("ae=",type(ae),"\n",ae)
 
@@ -76,4 +76,24 @@ print("ae=",type(ae),"\n",ae)
 #
 
 js = json.dumps(ae,indent=4)
-print("\n",js)
+print("\n",js)
+
+
+#
+# Now we'll do the same, except we'll generate the nonce using the TPM's random number generator
+#
+
+r = tpm.get_random( 8 )
+
+extradata_to_use = TPM2B_DATA(str(r))
+
+print("\nWith randomly generated extra data: ",str(r))
+
+quote,signature = tpm.quote(
+	  handle, pcrsels, extradata_to_use
+	)
+
+att,_ = TPMS_ATTEST.unmarshal( bytes(quote) )
+enc = json_encdec()
+ae = enc.encode(att)
+print("ae2=",type(ae),"\n",ae)

PythonExamples/randomnumber.md

@@ -0,0 +1,30 @@
+# Quote
+
+This example demonstrates the use of ESAPI.get_random
+
+The code will:
+
+   * setup the ESAPI interface
+   * send a TPM_STARTUP clear command
+   * request 8 random numbers from the TPM
+   * print out the result
+
+## Setup and Variables
+
+No specific setup is required. You may wish to change the number of bytes returned in the `get_random` call. 
+
+## Running
+
+To run type `python3 quote.py`
+
+Errors might be generated as the pytss libraries search for a suitable TPM device. If everything is successful then a random number will be shown.
+
+## Output
+
+```bash
+~/tpm.dev.tutorials/PythonExamples$ python3 randomnumber.py 
+type is  <class 'tpm2_pytss.types.TPM2B_DIGEST'>
+r    is  a10ab7558675a56c
+as int   11604288967829464428
+
+```

PythonExamples/randomnumber.py

@@ -0,0 +1,31 @@
+#
+# Import the tpm2_pytss libraries 
+#
+
+from tpm2_pytss import *
+
+#
+# Make a connection to a TPM and use the ESAPI interface
+# tcti=None means that the pytss libraries will search for an available TCTI
+#
+#
+# When this is run, then as the various TCTI interfaces are searched errors are written if those interfaces are not foud
+#
+
+tpm = ESAPI(tcti=None)
+
+# 
+# Send a startup message, just in case (actually this is because I'm using the IBM SW TPM and haven't started it properly)
+#
+
+tpm.startup(TPM2_SU.CLEAR)
+
+#
+# Now to make the quote and return the attested values and signature
+#
+
+r = tpm.get_random( 8 )
+
+print("type is ",type(r))
+print("r    is ",str(r))
+print("as int  ",int(str(r),16))