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package tpm2
import (
"io"
)
var (
labelDuplicate = "DUPLICATE"
)
// CreateDuplicate encrypts an object so that it can be imported under a target Storage Key.
// An inner wrapper is not supported.
func CreateDuplicate(rand io.Reader, pub LabeledEncapsulationKey, name []byte, sensitive []byte) (duplicate []byte, encSecret []byte, err error) {
secret, ciphertext, err := pub.Encapsulate(rand, labelDuplicate)
if err != nil {
return nil, nil, err
}
// Marshal the sensitive as a TPM2B_SENSITIVE before encrypting it.
// See Part 1, "Outer Duplication Wrapper"
sensitive2B := Marshal(TPM2BDigest{Buffer: sensitive})
// Encrypt the sensitive2B as dupSensitive.
dupSensitive, err := deriveAndEncrypt(pub, secret, name, sensitive2B)
if err != nil {
return nil, nil, err
}
// Compute the HMAC of (dupSensitive || name)
outerHMAC, err := deriveAndHMAC(pub, secret, nil, dupSensitive, name)
if err != nil {
return nil, nil, err
}
// Marshal the virtual _PRIVATE ourselves. We have to do this since dupSensitive's size is encrypted.
duplicate = make([]byte, 0, 2+len(outerHMAC)+len(dupSensitive))
duplicate = append(duplicate, Marshal(TPM2BDigest{Buffer: outerHMAC})...)
duplicate = append(duplicate, dupSensitive...)
return duplicate, ciphertext, nil
}
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