encryption - InvalidKeyException java.security.InvalidKeyException: No installed provider supports this key: (null) -



encryption - InvalidKeyException java.security.InvalidKeyException: No installed provider supports this key: (null) -

i have 2 classes, 1 main class , implementation of aes.

however, in aes class have method decrypt string, whenever run it, gives exception

my encryption method works fine decryption method doesn't work expected.

the code

private cipher aescipherfordecryption; string strdecryptedtext = new string(); public string decryptaes(final string ciphertext) { seek { aescipherfordecryption = cipher.getinstance("aes/cbc/pkcs5padding"); aescipherfordecryption.init(cipher.decrypt_mode, secretkey, new ivparameterspec(iv)); byte[] bytedecryptedtext = aescipherfordecryption.dofinal(byteciphertext); strdecryptedtext = new string(bytedecryptedtext); } grab (illegalblocksizeexception e) { system.out.print("illegalblocksizeexception " +e); } grab (badpaddingexception e) { system.out.print("badpaddingexception "+e); } grab (nosuchalgorithmexception e) { system.out.print("nosuchalgorithmexception "+ e); } grab (nosuchpaddingexception e) { system.out.print("nosuchpaddingexception "+e); } grab (invalidkeyexception e) { system.out.print("invalidkeyexception "+e); } grab (invalidalgorithmparameterexception e) { system.out.print("invalidalgorithmparameterexception "+e); } system.out.println("\ndecrypted text message " + strdecryptedtext); homecoming strdecryptedtext; }

the error method outputs is

invalidkeyexception java.security.invalidkeyexception: no installed provider supports key: (null)

update #1:

so have updated code following

public string decryptaes(byte[] ciphertext) { string strdecryptedtext = new string(); seek { byte[] bytedecryptedtext = aescipherfordecryption.dofinal(ciphertext); strdecryptedtext = new string(bytedecryptedtext); } grab (illegalblocksizeexception e) { system.out.print("illegalblocksizeexception "+e); e.printstacktrace(); } grab (badpaddingexception e) { system.out.print("badpaddingexception "+e); e.printstacktrace(); } system.out.println("\ndecrypted text message " + strdecryptedtext); homecoming strdecryptedtext; }

and in main class have line

byte [] byteciphertext = ciphertext.getbytes();

just convert string bytes

is correct? i'm still having

illegalblocksizeexception javax.crypto.illegalblocksizeexception: input length must multiple of 16 when decrypting padded cipherjavax.crypto.illegalblocksizeexception: input length must multiple of 16 when decrypting padded cipher

could help me prepare issue?

thank you.

secretkey null.

other problems:

you aren't using input parameter ciphertext. the input parameter ciphertext should byte[], not string: cipher text binary, , string not container binary data. the result string strdecryptedtext should local variable, not fellow member variable.

java encryption aes

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