CODEWITHSUNDEEP
spibustpmhardware-interface
Bar K
Bar K

Reputation: 11

What could be causing TPM_RC_COMMAND_SIZE error (0x80010000000a00000142) in response to TPM_GETRANDOM?

I am encountering an issue while working with an Infineon SLB9670 TPM (Trusted Platform Module) using its SPI.

I am issuing the TPM_GETRANDOM command, and receiving the error code:

0x80010000000a00000142 (TPM_RC_COMMAND_SIZE)

The specific sequence of transactions leading to this error is as follows:

Operation mAddress Size data out dataIn miso out
read 0x0 1 0x81
read 0x0 1 0x81
write 0x0 1 0x02 0
read 0x0 1 0xA1
read 0x18 1 0x40
read 0x19 1 0xFF
write 0x24 c 0x80010000 000c0000 017b0010 0 0 0 0 0x80 0 0 0 0 0 0 0
read 0x18 1 0x88
write 0x18 1 0x20 0
read 0x18 1 0x90
read 0x18 1 0x90
read 0x18 1 0x90
read 0x18 1 0x90
read 0x19 1 0x0A
read 0x1a 1 0x00
read 0x24 a 0x420100000A0000000180
read 0x18 1 0x80
read 0x18 1 0x80
write 0x18 1 0x40 0
write 0x0 1 0x20 0
read 0x19 1 0xFF
read 0x0 1 0x81

I'm having trouble pinpointing the root cause of this error. Could someone shed some light on what might be causing this TPM_RC_COMMAND_SIZE error?

Any insights or suggestions would be greatly appreciated. Thank you.

Upvotes: 0

Views: 112

Answers (1)

Ken
Ken

Reputation: 29

If you post the actual command stream, I can test it for you.

Or use a SW TPM to debug, e.g., https://github.com/kgoldman/ibmswtpm2.

On Windows, the MS Store has a command decoder that might help.

Upvotes: 0

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