tree 93170cc94d34625bc1424c275549574cd8b35257
parent 0d0729a62fd8a9c38b708b51f9813e199c9082ea
author Eran Messeri <eranm@google.com> 1652174379 +0100
committer Eran Messeri <eranm@google.com> 1652174379 +0100

Keystore: Support Ed25519 keys

Implement support for Ed25519 signing keys in Android Keystore.
Because Conscrypt does not yet handle those keys, the Keystore classes
implement EdECPublicKey directly and parse the keys.

Specifically, AndroidKeyStoreEdECPublicKey can take an encoded X.509 key
specification, validate the encoding is of an Ed25519 key, then parse
the oddity and Y point on the curve.
RFC8032 describes EdDSA signature scheme, particularly Ed25519.
RFC8410, Section 3, defines the OID for Ed25519 keys (1.3.101.112).
RFC8410, Section 4, describes the encoding of the public key.

Bug: 195309719
Bug: 194359292
Bug: 214203951
Test: atest android.security.keystore2.AndroidKeyStoreEdECPublicKeyTest
Merged-In: I07b793cbd5029630768368ad4a863bbc1c828ced
Change-Id: I477e87658b98bc3340da9a062d81508aad041c07