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Before, we support reading SRK password from env TPM_SRK_PW,
but it is a plain password and not secure.
So, we improve it and support to get an encrypted (AES algorithm)
SRK password from env, and then parse it. The default decrypting
AES password and salt is set in bb file.
When we initialize TPM, and set a SRK pw, and then we need to
encrypt it with the same AES password and salt by AES algorithm.
At last, we set a env as below:
export TPM_SRK_ENC_PW=xxxxxxxx
"xxxxxxxx" is the encrypted SRK password for libtpm.so.
Signed-off-by: Meng Li <Meng.Li@windriver.com>
Signed-off-by: Lans Zhang <jia.zhang@windriver.com>
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