Java aes encryption string to hex

Question

I am using node forge package to encrypt and decrypt on my server , now I am trying to encrypt data from my client app on android and want to send data back to my server in hex format but the below code is not working

val KEY_AES= "************"
val IV_AES= "************"
fun encrypat(value: String): String? {
    try {
        val key: ByteArray = KEY_AES.toByteArray()
        val ivs: ByteArray = IV_AES.toByteArray()
        val cipher = Cipher.getInstance("AES/CBC/PKCS7Padding")
        val secretKeySpec = SecretKeySpec(key, "AES")
        val paramSpec: AlgorithmParameterSpec = IvParameterSpec(ivs)
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, paramSpec)
        return Hex.encodeHexString(cipher.doFinal(value.toByteArray(charset("UTF-8"))),true)
    } catch (e: Exception) {
        e.printStackTrace()
    }
    return null
}

error :java.lang.NoSuchMethodError: No static method encodeHexString([BZ)Ljava/lang/String; in class Lorg/apache/commons/codec/binary/Hex; or its super classes (declaration of 'org.apache.commons.codec.binary.Hex' appears in /system/framework/org.apache.http.legacy.jar)

@blackapps , I do not want base64 string , I want hex format , edited to show the error — LumbusterTick, Feb 09 '22 at 12:27
@blackapps all stackoverflow answers for hex show this function — LumbusterTick, Feb 09 '22 at 12:28
@blackapps required libraries are all added , even used common 1.3 — LumbusterTick, Feb 09 '22 at 12:29
I used this one to encrypt : https://stackoverflow.com/questions/29232705/encrypt-text-to-aes-cbc-pkcs7padding and these ones to change the data to hex : 1-https://stackoverflow.com/questions/41611248/java-convert-base64-to-hex-string 2-https://stackoverflow.com/questions/9126567/method-not-found-using-digestutils-in-android used many others also still does not work — LumbusterTick, Feb 09 '22 at 12:34
What i miss in your question is if you have problems with encryption or with encoding to hex. — blackapps, Feb 09 '22 at 12:37
@blackapps encryption is working now need to encode to hex instead of base64 — LumbusterTick, Feb 09 '22 at 12:38
I do not understand that you would use Hex.encodeHexString() if you have to hexencode a byte array. I would rather think something like Hex.encodeByteArray(). — blackapps, Feb 09 '22 at 12:40

score 1 · Answer 1 · answered Feb 09 '22 at 12:37

1

You are using the legacy version of apache.http. But you should be able to get the same results with the available char[] encodeHex(byte[] data) method.

answered Feb 09 '22 at 12:37

Jonas

159
8

your answer with char[] encodeHex lead me to this : https://stackoverflow.com/questions/9655181/how-to-convert-a-byte-array-to-a-hex-string-in-java?page=1&tab=votes#tab-top now it works , Thanks alot – LumbusterTick Feb 09 '22 at 12:59

Java aes encryption string to hex

1 Answers1