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38 lines
1.7 KiB
Go
38 lines
1.7 KiB
Go
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package s3crypto
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// DefaultInstructionKeySuffix is appended to the end of the instruction file key when
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// grabbing or saving to S3
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const DefaultInstructionKeySuffix = ".instruction"
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const (
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metaHeader = "x-amz-meta"
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keyV1Header = "x-amz-key"
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keyV2Header = keyV1Header + "-v2"
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ivHeader = "x-amz-iv"
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matDescHeader = "x-amz-matdesc"
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cekAlgorithmHeader = "x-amz-cek-alg"
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wrapAlgorithmHeader = "x-amz-wrap-alg"
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tagLengthHeader = "x-amz-tag-len"
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unencryptedMD5Header = "x-amz-unencrypted-content-md5"
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unencryptedContentLengthHeader = "x-amz-unencrypted-content-length"
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)
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// Envelope encryption starts off by generating a random symmetric key using
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// AES GCM. The SDK generates a random IV based off the encryption cipher
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// chosen. The master key that was provided, whether by the user or KMS, will be used
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// to encrypt the randomly generated symmetric key and base64 encode the iv. This will
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// allow for decryption of that same data later.
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type Envelope struct {
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// IV is the randomly generated IV base64 encoded.
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IV string `json:"x-amz-iv"`
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// CipherKey is the randomly generated cipher key.
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CipherKey string `json:"x-amz-key-v2"`
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// MaterialDesc is a description to distinguish from other envelopes.
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MatDesc string `json:"x-amz-matdesc"`
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WrapAlg string `json:"x-amz-wrap-alg"`
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CEKAlg string `json:"x-amz-cek-alg"`
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TagLen string `json:"x-amz-tag-len"`
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UnencryptedMD5 string `json:"x-amz-unencrypted-content-md5"`
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UnencryptedContentLen string `json:"x-amz-unencrypted-content-length"`
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}
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