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29 lines
914 B
Markdown
29 lines
914 B
Markdown
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# libsigrokdecoder_spi-tpm
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libsigrok stacked Protocol Decoder for TPM 2.0 & TPM 1.2 transactions from an SPI bus.
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BitLocker Volume Master Key (VMK) is automatically extracted.
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## How to use
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### CLI
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Example from a previous capture (Value Change Dump - .vcd format):
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1. Identifying channels name:
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`sigrok-cli -i capture.vcd --show`
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2. Extracting BitLocker VMK (filter output to extract only VMK annotations)
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`.\sigrok-cli.exe -i C:\Users\jovre\Documents\tpm_spi_comm_2.vcd -I vcd:numchannels=6 -P spi:wordsize=8:cs_polarity=active-high:miso=libsigrok4DSL.3:mosi=libsigrok4DSL.1:clk=libsigrok4DSL.2:cs=libsigrok4DSL.0,spi_tpm:tpm_version=1.2 -A spi_tpm=VMK`
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***command output:***
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`spi_tpm-1: VMK header: 2c0005000100000003200000`
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`spi_tpm-1: VMK: 85e5xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxee00`
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### GUI
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Use and configure the SPI Protocol Decoder and then select SPI TPM Stack Decoder.
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