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35 lines
856 B
Go
35 lines
856 B
Go
package s3crypto
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// Padder handles padding of crypto data
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type Padder interface {
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// Pad will pad the byte array.
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// The second parameter is NOT how many
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// bytes to pad by, but how many bytes
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// have been read prior to the padding.
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// This allows for streamable padding.
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Pad([]byte, int) ([]byte, error)
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// Unpad will unpad the byte bytes. Unpad
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// methods must be constant time.
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Unpad([]byte) ([]byte, error)
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// Name returns the name of the padder.
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// This is used when decrypting on
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// instantiating new padders.
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Name() string
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}
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// NoPadder does not pad anything
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var NoPadder = Padder(noPadder{})
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type noPadder struct{}
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func (padder noPadder) Pad(b []byte, n int) ([]byte, error) {
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return b, nil
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}
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func (padder noPadder) Unpad(b []byte) ([]byte, error) {
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return b, nil
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}
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func (padder noPadder) Name() string {
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return "NoPadding"
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}
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