Wrong byte order for serialized integers in tpm2_quote/tpm2_checkquote PCR output file

[fblaese]

The integers in the TPML_PCR_SELECTION struct of the PCR output file (serialized) of tpm2_quote are written in little-endian byte order. On the other hand, the quote message (type TPMS_ATTEST) generated by the TPM with tpm2_quote -m <msg_file> also contains the same TPML_PCR_SELECTION, but in big-endian byte order (data is generated by the TPM).

According to the TPM 2.0 specification [TPM 2.0 Part 1, 7.4.1], integers shall be written in big-endian byte order when marshaling buffers.

The little-endian byte order makes the output format of tpm2_quote and the input format for tpm2_checkquote incompatible with other libraries (i.e. go-tpm).

[fblaese]

It looks like this behavior is somewhat intentional to preserve compatibility: #2228