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58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
/*
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* constants.go - Some metadata constants used throughout fscrypt
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*
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* Copyright 2017 Google Inc.
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* Author: Joe Richey (joerichey@google.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package metadata
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import (
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"crypto/sha256"
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"golang.org/x/sys/unix"
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)
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// Lengths for our keys, buffers, and strings used in fscrypt.
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const (
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// Length of policy descriptor (in hex chars) for v1 encryption policies
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PolicyDescriptorLenV1 = 2 * unix.FSCRYPT_KEY_DESCRIPTOR_SIZE
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// Length of protector descriptor (in hex chars)
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ProtectorDescriptorLen = PolicyDescriptorLenV1
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// Length of policy descriptor (in hex chars) for v2 encryption policies
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PolicyDescriptorLenV2 = 2 * unix.FSCRYPT_KEY_IDENTIFIER_SIZE
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// We always use 256-bit keys internally (compared to 512-bit policy keys).
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InternalKeyLen = 32
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IVLen = 16
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SaltLen = 16
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// We use SHA256 for the HMAC, and len(HMAC) == len(hash size).
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HMACLen = sha256.Size
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// PolicyKeyLen is the length of all keys passed directly to the Keyring
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PolicyKeyLen = unix.FSCRYPT_MAX_KEY_SIZE
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)
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var (
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// DefaultOptions use the supported encryption modes, max padding, and
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// policy version 1.
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DefaultOptions = &EncryptionOptions{
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Padding: 32,
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Contents: EncryptionOptions_AES_256_XTS,
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Filenames: EncryptionOptions_AES_256_CTS,
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PolicyVersion: 1,
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}
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// DefaultSource is the source we use if none is specified.
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DefaultSource = SourceType_custom_passphrase
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)
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