Chris Coulson
93e9c2c974
The TPM2_NV_Read commands returns the requested data in a TPM2B_MAX_NV_BUFFER type, the maximum size of which is TPM-specific and can be determined by querying the value of the TPM_PT_NV_BUFFER_MAX property. The value of this may be smaller than the payload size of some NV indexes, particularly when that payload is a X509 certificate with a RSA public key. Eg, the manufacturer supplied RSA EK certificate on my own machine has a size of 1035 bytes, and the value of TPM_PT_NV_BUFFER_MAX is 1024. To handle this case and make it possible to read any EK certificate from the TPM, make tpm2_read_nv_index support chunked reads when the payload size is larger than what the TPM can return in a single command.
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