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Add STORAGE_KEY tag to keymaster 4.1

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These are keymaster keys used specifically for storage
encryption. This provides the ability for keymaster implementations to
securely protect storage encryption keys.

Test: VtsHalKeymasterV4_1TargetTest
Bug: 147733587
Change-Id: I5f7f83755fcbed96d8f38fa51812aa6d2eb0927b
Merged-In: I5f7f83755fcbed96d8f38fa51812aa6d2eb0927b
This commit is contained in:
Barani Muthukumaran
2020-01-16 18:08:25 -08:00
committed by Shawn Willden
parent 166c5c70c2
commit 9e8014d1d5
3 changed files with 21 additions and 1 deletions
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2
current.txt
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@@ -623,7 +623,7 @@ bbeee9604128ede83ee755b67e73b5ad29e6e1dbac9ec41fea6ffe2745b0c50a android.hardwar
8da9c938e58f7d636ddd2f92c646f99d9a9e79612e6441b6380ab12744251873 android.hardware.identity@1.0::IWritableIdentityCredential
27ae3724053940462114228872b3ffaf0b8e6177d5ba97f5a76339d12b8a99dd android.hardware.keymaster@4.1::IKeymasterDevice
adb0efdf1462e9b2e742c0dcadd598666aac551f178be06e755bfcdf5797abd0 android.hardware.keymaster@4.1::IOperation
ac429fca0da4ce91218768ec31b64ded88251f8a26d8c4f27c06abdc5b1926d9 android.hardware.keymaster@4.1::types
ddcf89cd8ee2df0d32aee55050826446fb64f7aafde0a7cd946c64f61b1a364c android.hardware.keymaster@4.1::types
65c16331e57f6dd68b3971f06f78fe9e3209afb60630c31705aa355f9a52bf0d android.hardware.neuralnetworks@1.3::IBuffer
9b41dd49e2dcc2ecb4243d03f8421d72494ada5cf2945bff88f0019eeca56923 android.hardware.neuralnetworks@1.3::IDevice
4167dc3ad35e9cd0d2057d4868c7675ae2c3c9d05bbd614c1f5dccfa5fd68797 android.hardware.neuralnetworks@1.3::IExecutionCallback

1
keymaster/4.1/support/include/keymasterV4_1/keymaster_tags.h
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@@ -100,6 +100,7 @@ using V4_0::TAG_VENDOR_PATCHLEVEL;
DECLARE_KM_4_1_TYPED_TAG(EARLY_BOOT_ONLY);
DECLARE_KM_4_1_TYPED_TAG(DEVICE_UNIQUE_ATTESTATION);
DECLARE_KM_4_1_TYPED_TAG(STORAGE_KEY);
} // namespace android::hardware::keymaster::V4_1

19
keymaster/4.1/types.hal
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@@ -50,10 +50,29 @@ enum Tag : @4.0::Tag {
* HAL attests to Credential Keys. IIdentityCredential produces Keymaster-style attestations.
*/
IDENTITY_CREDENTIAL_KEY = TagType:BOOL | 721,
/**
* To prevent keys from being compromised if an attacker acquires read access to system / kernel
* memory, some inline encryption hardware supports protecting storage encryption keys in hardware
* without software having access to or the ability to set the plaintext keys. Instead, software
* only sees wrapped version of these keys.
*
* STORAGE_KEY is used to denote that a key generated or imported is a key used for storage
* encryption. Keys of this type can either be generated or imported or secure imported using
* keymaster. exportKey() can be used to re-wrap storage key with a per-boot ephemeral key wrapped
* key once the key characteristics are enforced.
*
* Keys with this tag cannot be used for any operation within keymaster.
* ErrorCode::INVALID_OPERATION is returned when a key with Tag::STORAGE_KEY is provided to
* begin().
*/
STORAGE_KEY = TagType:BOOL | 722,
};
enum ErrorCode : @4.0::ErrorCode {
EARLY_BOOT_ENDED = -73,
ATTESTATION_KEYS_NOT_PROVISIONED = -74,
ATTESTATION_IDS_NOT_PROVISIONED = -75,
INVALID_OPERATION = -76,
STORAGE_KEY_UNSUPPORTED = -77,
};