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This article mainly explains the "java version of the decryption demo method is what", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in-depth, together to study and learn "java version of the decryption demo method is what" it!

1.

Join pom.xml

Org.bouncycastle

Bcprov-jdk15on

1.59

two。

Import com.alibaba.fastjson.JSONObject

Import com.sun.org.apache.xerces.internal.impl.dv.util.Base64

Import java.security.AlgorithmParameters

Import java.security.Security

Import java.util.Arrays

Import javax.crypto.Cipher

Import javax.crypto.spec.IvParameterSpec

Import javax.crypto.spec.SecretKeySpec

Import org.bouncycastle.jce.provider.BouncyCastleProvider

/ * *

*

* decryption method

, /

Public class SecretUtils {

Public static JSONObject unEncrypted (String encryptedData, String sessionKey, String iv) {

/ / encrypted data

Byte [] dataByte = Base64.decode (encryptedData)

/ / encryption key

Byte [] keyByte = Base64.decode (sessionKey)

/ / offset

Byte [] ivByte = Base64.decode (iv)

Try {

/ / if the key is less than 16 bits, then make it up. The content in this if is very important.

Int base = 16

If (keyByte.length% base! = 0) {

Int groups = keyByte.length / base + (keyByte.length% base! = 0? 1: 0)

Byte [] temp = new byte [groups * base]

Arrays.fill (temp, (byte) 0)

System.arraycopy (keyByte, 0, temp, 0, keyByte.length)

KeyByte = temp

}

/ / initialize

Security.addProvider (new BouncyCastleProvider ())

Cipher cipher = Cipher.getInstance ("AES/CBC/PKCS7Padding", "BC")

SecretKeySpec spec = new SecretKeySpec (keyByte, "AES")

AlgorithmParameters parameters = AlgorithmParameters.getInstance ("AES")

Parameters.init (new IvParameterSpec (ivByte))

Cipher.init (Cipher.DECRYPT_MODE, spec, parameters); / / initialize

Byte [] resultByte = cipher.doFinal (dataByte)

If (null! = resultByte & & resultByte.length > 0) {

String result = new String (resultByte, "UTF-8")

Return JSONObject.parseObject (result)

}

} catch (Exception e) {

E.printStackTrace ()

}

Return null

}

}

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