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This commit adds two new functions to the internal `etag` package: - `ETag.Format` - `Decrypt` The `Decrypt` function decrypts an encrypted ETag using a decryption key. It returns not encrypted / multipart ETags unmodified. The `Decrypt` function is mainly used when handling SSE-S3 encrypted single-part objects. In particular, the ETag of an SSE-S3 encrypted single-part object needs to be decrypted since S3 clients expect that this ETag is equal to the content MD5. The `ETag.Format` method also covers SSE ETag handling. MinIO encrypts all ETags of SSE single part objects. However, only the ETag of SSE-S3 encrypted single part objects needs to be decrypted. The ETag of an SSE-C or SSE-KMS single part object does not correspond to its content MD5 and can be a random value. The `ETag.Format` function formats an ETag such that it is an AWS S3 compliant ETag. In particular, it returns non-encrypted ETags (single / multipart) unmodified. However, for encrypted ETags it returns the trailing 16 bytes as ETag. For encrypted ETags the last 16 bytes will be a random value. The main purpose of `Format` is to format ETags such that clients accept them as well-formed AWS S3 ETags. It differs from the `String` method since `String` will return string representations for encrypted ETags that are not AWS S3 compliant. Signed-off-by: Andreas Auernhammer <hi@aead.dev> |
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| .. | ||
| etag_test.go | ||
| etag.go | ||
| reader.go | ||