67 lines
2.9 KiB
Go
67 lines
2.9 KiB
Go
/*
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Package s3crypto provides encryption to S3 using KMS and AES GCM.
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Keyproviders are interfaces that handle masterkeys. Masterkeys are used to encrypt and decrypt the randomly
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generated cipher keys. The SDK currently uses KMS to do this. A user does not need to provide a master key
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since all that information is hidden in KMS.
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Modes are interfaces that handle content encryption and decryption. It is an abstraction layer that instantiates
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the ciphers. If content is being encrypted we generate the key and iv of the cipher. For decryption, we use the
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metadata stored either on the object or an instruction file object to decrypt the contents.
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Ciphers are interfaces that handle encryption and decryption of data. This may be key wrap ciphers or content
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ciphers.
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Creating an S3 cryptography client
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cmkID := "<some key ID>"
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sess := session.New()
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// Create the KeyProvider
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handler := s3crypto.NewKMSKeyGenerator(kms.New(sess), cmkID)
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// Create an encryption and decryption client
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// We need to pass the session here so S3 can use it. In addition, any decryption that
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// occurs will use the KMS client.
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svc := s3crypto.NewEncryptionClient(sess, s3crypto.AESGCMContentCipherBuilder(handler))
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svc := s3crypto.NewDecryptionClient(sess)
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Configuration of the S3 cryptography client
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cfg := s3crypto.EncryptionConfig{
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// Save instruction files to separate objects
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SaveStrategy: NewS3SaveStrategy(session.New(), ""),
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// Change instruction file suffix to .example
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InstructionFileSuffix: ".example",
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// Set temp folder path
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TempFolderPath: "/path/to/tmp/folder/",
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// Any content less than the minimum file size will use memory
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// instead of writing the contents to a temp file.
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MinFileSize: int64(1024 * 1024 * 1024),
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}
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The default SaveStrategy is to the object's header.
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The InstructionFileSuffix defaults to .instruction. Careful here though, if you do this, be sure you know
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what that suffix is in grabbing data. All requests will look for fooKey.example instead of fooKey.instruction.
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This suffix only affects gets and not puts. Put uses the keyprovider's suffix.
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Registration of new wrap or cek algorithms are also supported by the SDK. Let's say we want to support `AES Wrap`
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and `AES CTR`. Let's assume we have already defined the functionality.
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svc := s3crypto.NewDecryptionClient(sess)
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svc.WrapRegistry["AESWrap"] = NewAESWrap
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svc.CEKRegistry["AES/CTR/NoPadding"] = NewAESCTR
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We have now registered these new algorithms to the decryption client. When the client calls `GetObject` and sees
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the wrap as `AESWrap` then it'll use that wrap algorithm. This is also true for `AES/CTR/NoPadding`.
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For encryption adding a custom content cipher builder and key handler will allow for encryption of custom
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defined ciphers.
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// Our wrap algorithm, AESWrap
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handler := NewAESWrap(key, iv)
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// Our content cipher builder, AESCTRContentCipherBuilder
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svc := s3crypto.NewEncryptionClient(sess, NewAESCTRContentCipherBuilder(handler))
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*/
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package s3crypto
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