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【Java】 rsa加密

作者:柠檬爱曾 / 发布于2015/10/19/ 660


	public class RSAHelper_t {
	
	 /**
	 * 得到公钥
	 *
	 * @param key
	 * 密钥字符串（经过base64编码）
	 * @throws Exception
	 */
	 public static PublicKey getPublicKey(String key) throws Exception {
	 byte[] keyBytes;
	 keyBytes = (new BASE64Decoder()).decodeBuffer(key);
	
	 X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
	 KeyFactory keyFactory = KeyFactory.getInstance("RSA");
	 PublicKey publicKey = keyFactory.generatePublic(keySpec);
	 return publicKey;
	 }
	
	 /**
	 * 得到私钥
	 *
	 * @param key
	 * 密钥字符串（经过base64编码）
	 * @throws Exception
	 */
	 public static PrivateKey getPrivateKey(String key) throws Exception {
	 byte[] keyBytes;
	 keyBytes = (new BASE64Decoder()).decodeBuffer(key);
	
	 PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
	 KeyFactory keyFactory = KeyFactory.getInstance("RSA");
	 PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
	 return privateKey;
	 }
	
	 /**
	 * 得到密钥字符串（经过base64编码）
	 *
	 * @return
	 */
	 public static String getKeyString(Key key) throws Exception {
	 byte[] keyBytes = key.getEncoded();
	 String s = (new BASE64Encoder()).encode(keyBytes);
	 return s;
	 }
	
	
	
	}

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　rsa　　加密　

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