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我在密新手，我總是得到這個犯錯鑑於最終塊未正確填充，加密問題
有一個服務：http://aesencryption.net/ 所以我爲了把服務結果在我的測試案例
加密文本key: passwd
original: mysecret
bytes: 128 (*don't know what it means but anyway..)
encrypted: EaDf/5rVXY3qMeQx1JmPCw==
，我有這個Scala代碼
import javax.crypto.Cipher
import javax.crypto.spec.SecretKeySpec
import com.github.kondaurovdev.snippets.helper.{CryptoHelper, TryHelper}
import org.apache.commons.codec.binary.Base64
object Crypter {
def apply(secret: String): Either[String, Crypter] = {
for (
s <- CryptoHelper.getSecretKey(secret).left.map(err => s"Can't get secretKeySpec: $err").right
) yield new Crypter(s)
}
}
class Crypter(secretKey: SecretKeySpec) {
def encrypt(input: String): Either[String, String] = {
TryHelper.tryBlock({
val cipher = Cipher.getInstance("AES/ECB/PKCS5Padding")
cipher.init(Cipher.ENCRYPT_MODE, secretKey)
val encrypted = cipher.doFinal(input.getBytes("UTF-8"))
Base64.encodeBase64String(encrypted)
}, "Can't encrypt text")
}
//input = base64 encoded string
def decrypt(input: String): Either[String, String] = {
for (
res <- {
TryHelper.tryBlock({
val cipher = Cipher.getInstance("AES/ECB/PKCS5Padding")
cipher.init(Cipher.DECRYPT_MODE, secretKey)
val decrypted = cipher.doFinal(Base64.decodeBase64(input))
new String(decrypted)
}, "Error while decrypting")
}.right
) yield res
}
}
object CryptoHelper {
def getSecretKey(myKey: String): Either[String, SecretKeySpec] = {
TryHelper.tryBlock({
var key = myKey.getBytes("UTF-8")
val sha = MessageDigest.getInstance("SHA-1")
key = sha.digest(key)
key = util.Arrays.copyOf(key, 16) // use only first 128 bit
new SecretKeySpec(key, "AES")
}, "Can't build secretKey")
}
}
object TryHelper {
def tryBlock[R, E <: Throwable](block: => R, errPrefix: String = "", handle: errorPF = handlePF): Either[String, R] = {
tryToEither(block).left.map(err => {
var msg = err.getMessage
if (errPrefix.nonEmpty) msg = s"$errPrefix: $msg"
msg
})
}
}
，我有這樣的測試案例：
import com.github.kondaurovdev.snippets.Crypter
import org.specs2.mutable.Specification
class CrypterSpec extends Specification {
"Crypter" should {
val crypter = Crypter("passwd")
"decrypt" in {
"case 1" in {
crypter.right.flatMap(_.decrypt("eRKUj0EIXgyqzNFwHWYSLw==")) must beRight("asd")
}
}
"encrypt" in {
"case 1" in {
crypter.right.flatMap(_.encrypt("asd")) must beRight("eRKUj0EIXgyqzNFwHWYSLw==")
}
}
}
}
但這些測試不及格..
> snippets/testOnly snippets.CrypterSpec
[info] CrypterSpec
[info]
[info] Crypter should
[info] decrypt
[error] x case 1
[error] 'Left(Error while decrypting: Given final block not properly padded)' is not Right (CrypterSpec.scala:15)
[info]
[info] encrypt
[error] x case 1
[error] 'Right(bVkPlx7E0OjhCWFyIHzM5Q==)' is Right but 'bVkPlx7E0OjhCWFyIHzM5Q==' is not equal to 'eRKUj0EIXgyqzNFwHWYSLw==' (CrypterSpec.scala:23)
[error] Actual: bVkPlx7E0OjhCWFyIHzM5Q==
[error] Expected: eRKUj0EIXgyqzNFwHWYSLw==
[info]
[info]
[info]
[info] Total for specification CrypterSpec
[info] Finished in 6 minutes 3 seconds, 588 ms
[info] 2 examples, 2 failures, 0 error
[info]
[error] Failed: Total 2, Failed 2, Errors 0, Passed 0
[error] Failed tests:
[error] snippets.CrypterSpec
[error] (snippets/test:testOnly) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 366 s, completed Jun 3, 2017 11:24:16 PM
我不知道scala，但是如果這是java，那麼返回'new String（解密）'將是一個錯誤。你在加密時做的所有事情都必須在解密時完成，所以你應該返回'new String（解密的，「UTF-8」）'。但是，這不會導致BadPaddingException，所以我還沒有看到那是什麼。我可能會嘗試重新創建一個Java代碼版本，並看看會發生什麼。 –