typescript - RSA encrypt using JSEncrypt and decrypt using BouncyCastle (Java) -


this might duplicate of this answered question, can't seem same results. hoping guidance here.

jsencrypt (client)

let encrypt = new encrypt.jsencrypt(); encrypt.setpublickey(this.publickey);  // retrieved server encrypt.encrypt(password);

bouncycastle (server) - rsa key generation

keypairgenerator generator = keypairgenerator.getinstance("rsa"); generator.initialize(1024); keypair pair = generator.generatekeypair(); publickey pubkey = pair.getpublic(); privatekey privkey = pair.getprivate();  // returned client string publickeystr = new string(base64.encodebase64(pubkey.getencoded())); string privatekeystr = new string(base64.encodebase64(privkey.getencoded()));

bouncycastle (server) - decryption

cipher cipher = cipher.getinstance("rsa/none/pkcs1padding"); cipher.init(cipher.decrypt_mode, privatekey); // org.apache.commons.codec.binary.hex  byte[] ciphertext = cipher.dofinal(hex.decodehex(encrypted.tochararray())); decrypted = new string(ciphertext, baseconstant.enc_utf8);

error

org.apache.commons.codec.decoderexception: illegal hexadecimal character @ index 0 @ org.apache.commons.codec.binary.hex.todigit(hex.java:178) @ org.apache.commons.codec.binary.hex.decodehex(hex.java:89)

one thing noticed length of encrypted text jsencrypt, 172, while encryption @ server side produces 256.

the answered question mentioned use rsa/none/pkcs1padding, had set. else missing?

the error occurs in hex.decodehex() method, means data not hex encoded string.

jsencrypt.encrypt() method returns encrypted data in base64 (instead of hex string). in order decrypt it, must decode base64 format.

so instead of:

byte[] ciphertext = cipher.dofinal(hex.decodehex(encrypted.tochararray()));

do this:

byte[] ciphertext = cipher.dofinal(base64.decodebase64(encrypted.tochararray()));

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