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crypto: add basic functionality for parsing SSE-C headers (#6148)

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This commit adds basic support for SSE-C / SSE-C copy.
This includes functions for determining whether SSE-C
is requested by the S3 client and functions for parsing
such HTTP headers.

All S3 SSE-C parsing errors are exported such that callers
can pattern-match to forward the correct error to S3
clients.

Further the SSE-C related internal metadata entry-keys
are added by this commit.
This commit is contained in:
Andreas Auernhammer
2018-07-18 19:49:26 +02:00
committed by Dee Koder
parent 3ec4738955
commit 758a80e39b
4 changed files with 420 additions and 4 deletions
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20
cmd/crypto/error.go
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@@ -27,6 +27,26 @@ var (
// ErrInvalidEncryptionMethod indicates that the specified SSE encryption method
// is not supported.
ErrInvalidEncryptionMethod = errors.New("The encryption method is not supported")
// ErrInvalidCustomerAlgorithm indicates that the specified SSE-C algorithm
// is not supported.
ErrInvalidCustomerAlgorithm = errors.New("The SSE-C algorithm is not supported")
// ErrMissingCustomerKey indicates that the HTTP headers contains no SSE-C client key.
ErrMissingCustomerKey = errors.New("The SSE-C request is missing the customer key")
// ErrMissingCustomerKeyMD5 indicates that the HTTP headers contains no SSE-C client key
// MD5 checksum.
ErrMissingCustomerKeyMD5 = errors.New("The SSE-C request is missing the customer key MD5")
// ErrInvalidCustomerKey indicates that the SSE-C client key is not valid - e.g. not a
// base64-encoded string or not 256 bits long.
ErrInvalidCustomerKey = errors.New("The SSE-C client key is invalid")
// ErrCustomerKeyMD5Mismatch indicates that the SSE-C key MD5 does not match the
// computed MD5 sum. This means that the client provided either the wrong key for
// a certain MD5 checksum or the wrong MD5 for a certain key.
ErrCustomerKeyMD5Mismatch = errors.New("The provided SSE-C key MD5 does not match the computed MD5 of the SSE-C key")
)
var (