title: Convert base64 encoded string to java byte array
body: <p>I am writing a decryption class (AES/CBC/PKCS7Padding) where the encrypted data is coming from C#. I want to take the following string (which is base64 encoded):</p>
  
  <p>usiTyri3/gPJJ0F6Kj9qYL0w/zXiUAEcslUH6/zVIjs=</p>
  
  <p>and convert it to a byte array in java to pass into the SecretKeySpec as the key. I know there is the issue of C# having unsigned bytes and java only having signed bytes. How then can I pass this sting which has values greater than 127 within it and have java accept the key and initialization vectors?</p>