Rsa读取pem公钥和私钥

1.把pem文件用text打开，把开头和结尾的begin和end内容删去，只留下字符串内容；
2.用流读取文件中的字符串；
3.用以下代码生成公钥和私钥对象；

	public static PublicKey string2PublicKey(String pubStr) throws Exception{
		byte[] keyBytes = base642Byte(pubStr);
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PublicKey publicKey = keyFactory.generatePublic(keySpec);
		return publicKey;
	}
	
	//将Base64编码后的私钥转换成PrivateKey对象
	public static PrivateKey string2PrivateKey(String priStr) throws Exception{
		byte[] keyBytes = base642Byte(priStr);
		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
		return privateKey;
	}

备注：
读取私钥前要加上：
java.security.Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
运行服务，不然运行会出现algid parse error, not a sequence错误。