Here's some TODOs after scoping the ECC support works.

* Support using ECC in attestation flow
  * fix cr50 EK generation, b/80207339
  * generate, store EK public key in attestation
  * request ECC AIK and stored ECC EK for further use.
  * support verify ECC EK at PCA side, https://crbug.com/377609
* Chaps (PKCS#11)
  * Software support ECC in libchaps
  * Hardware support ECC when TPM is available
* cryptohome
  * Use ECC in DecryptVaultKeyset
  * may be more?
* Replace internally use of RSA for share secret (Session/Duplication/Sharing for Credentials)
  * TPM2_StartAuthSession
  * etc.

Add bug 910485 to track ECC key operation works in trunks

Add  bug 910490  for ECC SRK changing.

Add changing of salt key

Add bug 910633 for tracking ECC support in chaps

Update the overview

* Support using ECC in attestation flow (bug 910519)
  * fix cr50 EK generation (b/80207339)
  * generate, store EK public key in attestation
  * request ECC AIK and stored ECC EK for further use.
  * support verify ECC EK at PCA side (bug 377609)
* Chaps (PKCS#11) (bug 910633)
  * Software support all ECC PKCS#11 functionality
  * Utilize TPM as hardware ECC key storage/generater when TPM is present. (reference the RSA implementation)
* trunks
  * ECC key operations support in tpm_utility (bug 910485)
  * ECC EK operations support in tpm_utility (bug 910491)
* Replace internally use of RSA for share secret (Session/Duplication/Sharing for Credentials)
  * Session salt key (bug 910495)
  * etc.
* cryptohome (TODO: add root bug)
  * Use ECC or remove for cryptohome key (bug 909050)
  * etc.