Grigori Goronzy
da29de23ef
Use a salted, unbound HMAC session with the primary key used as tpmKey, which mean that the random salt will be encrypted with the primary key while in transit. Decrypt/encrypt flags are set on the new session with AES in CFB mode. There is no fallback to XOR mode. This provides confidentiality and replay protection, both when sealing and unsealing. There is no protection against man in the middle attacks since we have no way to authenticate the TPM at the moment. The exception is unsealing with PIN, as an attacker will be unable to generate the proper HMAC digest.
System and Service Manager
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