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POHow do I RSA encrypt a string with a plaintext key using Java BouncyCastle API on Android
 

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  1. POHow do I RSA encrypt a string with a plaintext key using Java BouncyCastle API on Android
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    <p>I am trying to encrypt a string using the BouncyCastle API in Android to send off to a server.</p> <p>I have the public key in plaintext (in memory, not in the filesystem, of course! no need to yell at me, cryptographers ;) ) and I need to use this plaintext public key to encrypt a string to an RSA encrypted string.</p> <p>This is my class:</p> <pre><code>public class RSAEncryptor { //Get certificate from base64 string public static X509Certificate getCertificateFromBase64String(String string) throws CertificateException, javax.security.cert.CertificateException { if(string.equals("") || string == null) { return null; } byte[] certBytes = Base64.decode(string.getBytes(), Base64.DEFAULT); X509Certificate cert = X509Certificate.getInstance(certBytes); return cert; } //Get public key from base64 encoded string public static PublicKey getPublicKeyFromEncodedCertData(String encodedCertData) throws CertificateException, javax.security.cert.CertificateException { if(encodedCertData == null || encodedCertData.equals("")) return null; X509Certificate cert = getCertificateFromBase64String(encodedCertData); if(cert == null) return null; return cert.getPublicKey(); } public static String rsaEncrypt(String plainText, String keyFromResources) throws NoSuchAlgorithmException, InvalidKeySpecException, IOException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException // { if(plainText == null || plainText.equals("")) return null; if(keyFromResources == null || keyFromResources.equals("")) return null; byte[] encryptedBytes; Cipher cipher = Cipher.getInstance("RSA"); PublicKey publicKey = null; try { publicKey = getPublicKeyFromEncodedCertData(keyFromResources); } catch(Exception ex) { Logger.LogError("getPublicKeyFromEncodedCertData()", ex); } cipher.init(Cipher.ENCRYPT_MODE, publicKey); encryptedBytes = cipher.doFinal(plainText.getBytes()); String encrypted = new String(encryptedBytes); return encrypted; } </code></pre> <p>}</p> <p>I'm currently not getting the properly encrypted string back out, just a garbled mess like this:</p> <p><code>��RB��%����I��Q��F*�bd[@�y�_H]T{KƾuTN�Q� ��U�f��]�S �q|.t�t�9�Rˇ�����)��{�},ޱ�ª�ǥ#���@k=�WO���f�7t"yP�z�</code></p> <p>(The <code>&lt;?&gt;</code>'s are null chars)</p> <p>I should be getting back an alphanumeric string similar to this:</p> <p><code>2+tSXez8JrAIX+VJ2Dy4IsA56XhWpTwF8X2yGGaI6novucXknwykDyqJZICpmYcqx75qBRgxwrW2kY9LmQR2xU17PLqTukAu2Bna8WXYTmJJQ7CWsN3SdABlETRfsYA+g3A2rO2Qp6aR9OCBcFVJpnZJjb9kaOUj5Pcj0tNPFdM=</code> (changed obviously from the actual response :D)</p> <p>I'd appreciate any help!</p> <p>Thanks!</p> <p>Has anyone done this before? I'd love any suggestions you have as to how to fix this.</p>
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    1. COPublic keys are called that because they are meant to be public. So feel free to put them on a filesystem, or on the front page of the New York Times.
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      1. USJames K Polk
 

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