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package s3crypto import ( "bytes" "crypto/aes" "crypto/cipher" "io" ) // AESCBC is a symmetric crypto algorithm. This algorithm // requires a padder due to CBC needing to be of the same block // size. AES CBC is vulnerable to Padding Oracle attacks and // so should be avoided when possible. type aesCBC struct { encrypter cipher.BlockMode decrypter cipher.BlockMode padder Padder } // newAESCBC creates a new AES CBC cipher. Expects keys to be of // the correct size. func newAESCBC(cd CipherData, padder Padder) (Cipher, error) { block, err := aes.NewCipher(cd.Key) if err != nil { return nil, err } encrypter := cipher.NewCBCEncrypter(block, cd.IV) decrypter := cipher.NewCBCDecrypter(block, cd.IV) return &aesCBC{encrypter, decrypter, padder}, nil } // Encrypt will encrypt the data using AES CBC by returning // an io.Reader. The io.Reader will encrypt the data as Read // is called. func (c *aesCBC) Encrypt(src io.Reader) io.Reader { reader := &cbcEncryptReader{ encrypter: c.encrypter, src: src, padder: c.padder, } return reader } type cbcEncryptReader struct { encrypter cipher.BlockMode src io.Reader padder Padder size int buf bytes.Buffer } // Read will read from our io.Reader and encrypt the data as necessary. // Due to padding, we have to do some logic that when we encounter an // end of file to pad properly. func (reader *cbcEncryptReader) Read(data []byte) (int, error) { n, err := reader.src.Read(data) reader.size += n blockSize := reader.encrypter.BlockSize() reader.buf.Write(data[:n]) if err == io.EOF { b := make([]byte, getSliceSize(blockSize, reader.buf.Len(), len(data))) n, err = reader.buf.Read(b) if err != nil && err != io.EOF { return n, err } // The buffer is now empty, we can now pad the data if reader.buf.Len() == 0 { b, err = reader.padder.Pad(b[:n], reader.size) if err != nil { return n, err } n = len(b) err = io.EOF } // We only want to encrypt if we have read anything if n > 0 { reader.encrypter.CryptBlocks(data, b) } return n, err } if err != nil { return n, err } if size := reader.buf.Len(); size >= blockSize { nBlocks := size / blockSize if size > len(data) { nBlocks = len(data) / blockSize } if nBlocks > 0 { b := make([]byte, nBlocks*blockSize) n, _ = reader.buf.Read(b) reader.encrypter.CryptBlocks(data, b[:n]) } } else { n = 0 } return n, nil } // Decrypt will decrypt the data using AES CBC func (c *aesCBC) Decrypt(src io.Reader) io.Reader { return &cbcDecryptReader{ decrypter: c.decrypter, src: src, padder: c.padder, } } type cbcDecryptReader struct { decrypter cipher.BlockMode src io.Reader padder Padder buf bytes.Buffer } // Read will read from our io.Reader and decrypt the data as necessary. // Due to padding, we have to do some logic that when we encounter an // end of file to pad properly. func (reader *cbcDecryptReader) Read(data []byte) (int, error) { n, err := reader.src.Read(data) blockSize := reader.decrypter.BlockSize() reader.buf.Write(data[:n]) if err == io.EOF { b := make([]byte, getSliceSize(blockSize, reader.buf.Len(), len(data))) n, err = reader.buf.Read(b) if err != nil && err != io.EOF { return n, err } // We only want to decrypt if we have read anything if n > 0 { reader.decrypter.CryptBlocks(data, b) } if reader.buf.Len() == 0 { b, err = reader.padder.Unpad(data[:n]) n = len(b) if err != nil { return n, err } err = io.EOF } return n, err } if err != nil { return n, err } if size := reader.buf.Len(); size >= blockSize { nBlocks := size / blockSize if size > len(data) { nBlocks = len(data) / blockSize } // The last block is always padded. This will allow us to unpad // when we receive an io.EOF error nBlocks -= blockSize if nBlocks > 0 { b := make([]byte, nBlocks*blockSize) n, _ = reader.buf.Read(b) reader.decrypter.CryptBlocks(data, b[:n]) } else { n = 0 } } return n, nil } // getSliceSize will return the correct amount of bytes we need to // read with regards to padding. func getSliceSize(blockSize, bufSize, dataSize int) int { size := bufSize if bufSize > dataSize { size = dataSize } size = size - (size % blockSize) - blockSize if size <= 0 { size = blockSize } return size }