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POHow to encrypt decrypt with RSA keys in java
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copied!<p>I need to replace the encrypt and decrypt step from Unix to java code with the <code>rsaprivatekey.pem</code> and <code>rsapublickey.pem</code> keys generated with openssl</p> <p>I generate the keys</p> <pre><code>openssl genrsa -out /tmp/rsaprivatekey.pem -des3 1024 openssl rsa -in /tmp/rsaprivatekey.pem -pubout -out /tmp/rsapublickey.pem </code></pre> <p>i use the keys in unix (i need do it in java)</p> <pre><code>echo "Text to encript"| openssl rsautl -encrypt -inkey /tmp/rsapublickey.pem -pubin -out out.enc openssl rsautl -decrypt -inkey /tmp/rsaprivatekey.pem -in out.enc </code></pre> <p>This was my attempt to do it</p> <pre><code>public static void main(String[] args) { Base64 base64 = new Base64(); String TextStream = "this is the input text"; byte[] Cipher; System.out.println("input:\n" + TextStream); Cipher = encrypt(TextStream); System.out.println("cipher:\n" + base64.encodeAsString(Cipher)); System.out.println("decrypt:\n" + decrypt(Cipher)); } private static byte[] encrypt(String Buffer) { try { Cipher rsa; rsa = Cipher.getInstance("RSA"); rsa.init(Cipher.ENCRYPT_MODE, getPrivateKey(PRIVATE_PATH)); return rsa.doFinal(Buffer.getBytes()); } catch (Exception e) { e.printStackTrace(); } return null; } private static String decrypt(byte[] buffer) { try { Cipher rsa; rsa = Cipher.getInstance("RSA"); rsa.init(Cipher.DECRYPT_MODE, getPrivateKey(PUBLIC_PATH)); byte[] utf8 = rsa.doFinal(buffer); return new String(utf8, "UTF8"); } catch (Exception e) { e.printStackTrace(); } return null; } public static PrivateKey getPrivateKey(String filename) throws Exception { File f = new File(filename); FileInputStream fis = new FileInputStream(f); DataInputStream dis = new DataInputStream(fis); byte[] keyBytes = new byte[(int) f.length()]; dis.readFully(keyBytes); dis.close(); PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory kf = KeyFactory.getInstance("RSA"); return kf.generatePrivate(spec); } public static PublicKey getPublicKey(String filename) throws Exception { File f = new File(filename); FileInputStream fis = new FileInputStream(f); DataInputStream dis = new DataInputStream(fis); byte[] keyBytes = new byte[(int) f.length()]; dis.readFully(keyBytes); dis.close(); X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes); KeyFactory kf = KeyFactory.getInstance("RSA"); return kf.generatePublic(spec); } </code></pre> <p>but it not works, the PKCS8EncodedKeySpec/X509EncodedKeySpec are not correct... but i do not know what to put</p>

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