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69 lines
1.5 KiB
69 lines
1.5 KiB
package coscrypto
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import (
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"io"
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)
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// Cipher is interface for encryption or decryption of an object
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type Cipher interface {
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Encrypter
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Decrypter
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}
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// Encrypter is interface with only encrypt method
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type Encrypter interface {
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Encrypt(io.Reader) io.Reader
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}
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// Decrypter is interface with only decrypt method
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type Decrypter interface {
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Decrypt(io.Reader) io.Reader
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}
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// CryptoEncrypter provides close method for Encrypter
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type CryptoEncrypter struct {
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Body io.Reader
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Encrypter io.Reader
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isClosed bool
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}
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// Close lets the CryptoEncrypter satisfy io.ReadCloser interface
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func (rc *CryptoEncrypter) Close() error {
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rc.isClosed = true
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if closer, ok := rc.Body.(io.ReadCloser); ok {
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return closer.Close()
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}
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return nil
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}
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// Read lets the CryptoEncrypter satisfy io.ReadCloser interface
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func (rc *CryptoEncrypter) Read(b []byte) (int, error) {
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if rc.isClosed {
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return 0, io.EOF
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}
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return rc.Encrypter.Read(b)
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}
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// CryptoDecrypter provides close method for Decrypter
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type CryptoDecrypter struct {
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Body io.Reader
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Decrypter io.Reader
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isClosed bool
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}
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// Close lets the CryptoDecrypter satisfy io.ReadCloser interface
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func (rc *CryptoDecrypter) Close() error {
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rc.isClosed = true
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if closer, ok := rc.Body.(io.ReadCloser); ok {
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return closer.Close()
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}
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return nil
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}
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// Read lets the CryptoDecrypter satisfy io.ReadCloser interface
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func (rc *CryptoDecrypter) Read(b []byte) (int, error) {
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if rc.isClosed {
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return 0, io.EOF
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}
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return rc.Decrypter.Read(b)
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}
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