func create_readers(ciphers *[]block.Cipher) *[]io.Reader {
reader := &NullReaderWriter{}
// ECB, CBC, CTR, OFB ...?
readers := make([]io.Reader, len(*ciphers)*4)
for i, cipher := range *ciphers {
readers[i] = block.NewECBDecrypter(cipher, io.LimitReader(reader, 1024*1024*16))
readers[i+len(*ciphers)] = block.NewCBCDecrypter(cipher, gen_iv(cipher), io.LimitReader(reader, 1024*1024*16))
readers[i+2*len(*ciphers)] = block.NewCTRReader(cipher, gen_iv(cipher), io.LimitReader(reader, 1024*1024*16))
readers[i+3*len(*ciphers)] = block.NewOFBReader(cipher, gen_iv(cipher), io.LimitReader(reader, 1024*1024*16))
}
return &readers
}
// Decrypt using MySQL AES Decrypt
func AESDecrypt(in, key []byte) []byte {
cipher, err := aes.NewCipher(aesKey(key))
if err != nil {
return nil
}
pBuf := bytes.NewBuffer(make([]byte, 0, len(in)))
cRdr := block.NewECBDecrypter(cipher, bytes.NewBuffer(in))
_, err = pBuf.ReadFrom(cRdr)
if err != nil {
return nil
}
pText := pBuf.Bytes()
if len(pText) < 1 {
return nil
}
lenpt := len(pText) - int(pText[len(pText)-1])
if lenpt < 0 {
return nil
}
return pText[:lenpt]
}