Convertion of byte array in UTF-8 to GSM character set.

I want to convert byte array in UTF-8 to GSM character set. Please advice How can I do that?

String s = new String(byteArrayInUTF8,"utf-8");This will convert your byte array to a Java UNICODE UTF-16 encoded String on the assumption that the byte array represents characters encoded as utf-8.
I don't understand what GSM characters are so someone else will have to help you with the second part.

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    Since the byte array is in UTF-8, you can easily examine whether it is corrupt or not by taking a look at the last 4 bytes (at most). That is because the bit distribution of each byte (1st, 2nd, 3rd, and 4th) in UTF-8 encoding is well defined in its spec.
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    generator.init(new SecureRandom());
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    cipher.init(Cipher.ENCRYPT_MODE, key);
    String input = "Medicare Secure Prescription: 30 Tamazopan 200mg tablets. Dosage: 1 to be taken every 4 hours";
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    BASE64Encoder encoder = new BASE64Encoder();
    String ciphertext1 = encoder.encode(raw);
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    byte[] keybytes = key.getEncoded();
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    System.out.println(" - Random Prescription Key: "+randomkey);
    System.out.println("ENCRYPTION SUCESSFULL");
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    String passphrase = "ABCD1234efghIJ56"; //Patient Medicare Key
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    byte[] input2 = decoder.decodeBuffer(randomkey);
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    byte[] digest = md.digest();
    System.arraycopy(digest, 0, salt, 0, 8);
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    cipher = Cipher.getInstance(algorithm);
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    String ciphertext2 = encoder.encode(outputFinalKey);
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    //NOT CHANGED String passphrase = "ABCD1234efghIJ56";
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    System.out.println(" - Input Plain Text: "+ciphertext2);
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