RSA加密演算法生成公鑰和私鑰
阿新 • • 發佈:2018-11-10
Java RSA加密演算法生成公鑰和私鑰
import java.security.Key; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.interfaces.RSAPrivateKey; import java.security.interfaces.RSAPublicKey; import java.util.HashMap; import java.util.Map; import java.util.Base64; import java.util.Base64.Decoder; import java.util.Base64.Encoder; @SuppressWarnings("unused") public class TestRSA { public static final String KEY_ALGORITHM = "RSA"; public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; private static final String PUBLIC_KEY = "RSAPublicKey"; private static final String PRIVATE_KEY = "RSAPrivateKey"; public static void main(String[] args) { Map<String, Object> keyMap; try { keyMap = initKey(); String publicKey = getPublicKey(keyMap); System.out.println(publicKey); String privateKey = getPrivateKey(keyMap); System.out.println(privateKey); } catch (Exception e) { e.printStackTrace(); } } public static String getPublicKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PUBLIC_KEY); byte[] publicKey = key.getEncoded(); return encryptBASE64(key.getEncoded()); } public static String getPrivateKey(Map<String, Object> keyMap) throws Exception { Key key = (Key) keyMap.get(PRIVATE_KEY); byte[] privateKey = key.getEncoded(); return encryptBASE64(key.getEncoded()); } public static byte[] decryptBASE64(String key) throws Exception { Decoder decoder = Base64.getDecoder(); return decoder.decode(key); } public static String encryptBASE64(byte[] key) throws Exception { Encoder encoder = Base64.getEncoder(); return encoder.encodeToString(key); } public static Map<String, Object> initKey() throws Exception { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM); keyPairGen.initialize(1024); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); Map<String, Object> keyMap = new HashMap<String, Object>(2); keyMap.put(PUBLIC_KEY, publicKey); keyMap.put(PRIVATE_KEY, privateKey); return keyMap; } }
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