exception - Android, why IllegalBlockSizeException occur when i want to encrypt a string? -


i building android apps using fingerprint authentication, source code of generating key , cipher initialization encryption in fingerprint authentication (in fingerprintactivity).

public final void generatekey() {     try {         keystore = keystore.getinstance("androidkeystore");     } catch (exception e) {         e.printstacktrace();     }      keygenerator keygenerator;     try {         keygenerator = keygenerator.getinstance(keyproperties.key_algorithm_aes, "androidkeystore");     } catch (nosuchalgorithmexception | nosuchproviderexception e) {         throw new runtimeexception("failed keygenerator instance", e);     }      try {         keystore.load(null);         keygenerator.init(new                 keygenparameterspec.builder(key_name,                 keyproperties.purpose_encrypt |                         keyproperties.purpose_decrypt)                 .setblockmodes(keyproperties.block_mode_cbc)                 .setuserauthenticationrequired(true)                 .setencryptionpaddings(                         keyproperties.encryption_padding_pkcs7)                 .setkeysize(256)                 .build());         keygenerator.generatekey();     } catch (nosuchalgorithmexception |             invalidalgorithmparameterexception             | certificateexception | ioexception e) {         throw new runtimeexception(e);     } }  @targetapi(build.version_codes.m) public boolean cipherinit() {     try {         cipher = cipher.getinstance(keyproperties.key_algorithm_aes + "/" + keyproperties.block_mode_cbc + "/" + keyproperties.encryption_padding_pkcs7);     } catch (nosuchalgorithmexception | nosuchpaddingexception e) {         throw new runtimeexception("failed cipher", e);     }      try {         keystore.load(null);         secretkey key = (secretkey) keystore.getkey(key_name,                 null);         cipher.init(cipher.encrypt_mode, key);         return true;     } catch (keypermanentlyinvalidatedexception e) {         return false;     } catch (keystoreexception | certificateexception | unrecoverablekeyexception | ioexception | nosuchalgorithmexception | invalidkeyexception e) {         throw new runtimeexception("failed init cipher", e);     } }

then want reuse generated key @ activity (homeactivity, activity after fingerprint authentication succed) , take key this.

private static final string key_name = "androidhive"; private keystore keystore; private cipher cipher; string test = "abc"; byte[] encryptedbyte;      textview textview = (textview) findviewbyid(r.id.test);      try {         keystore = keystore.getinstance("androidkeystore");     } catch (exception e) {         e.printstacktrace();     }      try {         cipher = cipher.getinstance(keyproperties.key_algorithm_aes + "/" + keyproperties.block_mode_cbc + "/" + keyproperties.encryption_padding_pkcs7);     } catch (nosuchalgorithmexception | nosuchpaddingexception e) {         throw new runtimeexception("failed cipher", e);     }      try {         keystore.load(null);         secretkey key = (secretkey) keystore.getkey(key_name,                 null);         cipher.init(cipher.encrypt_mode, key);         encryptedbyte = cipher.dofinal(test.getbytes());     } catch (keypermanentlyinvalidatedexception e) {         textview.settext("a");     } catch (keystoreexception | certificateexception | unrecoverablekeyexception | ioexception | nosuchalgorithmexception | invalidkeyexception e) {         throw new runtimeexception("failed init cipher", e);     } catch (badpaddingexception e) {         e.printstacktrace();     } catch (illegalblocksizeexception e) {         e.printstacktrace();         textview.settext("c");     }

i set textview text know exception program got, , got it's illegal block size exception. know how fix ? credits : androidhive (its code , want develop further)


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