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package com.jchanghong.crypto;

import com.jchanghong.core.io.IORuntimeException;
import com.jchanghong.core.io.IoUtil;
import com.jchanghong.core.util.StrUtil;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemObjectGenerator;
import org.bouncycastle.util.io.pem.PemReader;
import org.bouncycastle.util.io.pem.PemWriter;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.security.Key;
import java.security.PrivateKey;
import java.security.PublicKey;

/**
 * PEM(Privacy Enhanced Mail)格式相关工具类。(基于Bouncy Castle)
 *
 * 

* PEM一般为文本格式,以 -----BEGIN... 开头,以 -----END... 结尾,中间的内容是 BASE64 编码。 *

* 这种格式可以保存证书和私钥,有时我们也把PEM格式的私钥的后缀改为 .key 以区别证书与私钥。 * * @author looly * @since 5.1.6 */ public class PemUtil { /** * 读取PEM格式的私钥 * * @param pemStream pem流 * @return {@link PrivateKey} * @since 4.5.2 */ public static PrivateKey readPemPrivateKey(InputStream pemStream) { return (PrivateKey) readPemKey(pemStream); } /** * 读取PEM格式的公钥 * * @param pemStream pem流 * @return {@link PublicKey} * @since 4.5.2 */ public static PublicKey readPemPublicKey(InputStream pemStream) { return (PublicKey) readPemKey(pemStream); } /** * 从pem文件中读取公钥或私钥
* 根据类型返回 {@link PublicKey} 或者 {@link PrivateKey} * * @param keyStream pem流 * @return {@link Key},null表示无法识别的密钥类型 * @since 5.1.6 */ public static Key readPemKey(InputStream keyStream) { final PemObject object = readPemObject(keyStream); final String type = object.getType(); if (StrUtil.isNotBlank(type)) { if (type.endsWith("PRIVATE KEY")) { return KeyUtil.generateRSAPrivateKey(object.getContent()); } else if (type.endsWith("PUBLIC KEY")) { return KeyUtil.generateRSAPublicKey(object.getContent()); } else if (type.endsWith("CERTIFICATE")) { return KeyUtil.readPublicKeyFromCert(IoUtil.toStream(object.getContent())); } } //表示无法识别的密钥类型 return null; } /** * 从pem流中读取公钥或私钥 * * @param keyStream pem流 * @return 密钥bytes * @since 5.1.6 */ public static byte[] readPem(InputStream keyStream) { PemObject pemObject = readPemObject(keyStream); if (null != pemObject) { return pemObject.getContent(); } return null; } /** * 读取pem文件中的信息,包括类型、头信息和密钥内容 * * @param keyStream pem流 * @return {@link PemObject} * @since 4.5.2 */ public static PemObject readPemObject(InputStream keyStream) { return readPemObject(IoUtil.getUtf8Reader(keyStream)); } /** * 读取pem文件中的信息,包括类型、头信息和密钥内容 * * @param reader pem Reader * @return {@link PemObject} * @since 5.1.6 */ public static PemObject readPemObject(Reader reader) { PemReader pemReader = null; try { pemReader = new PemReader(reader); return pemReader.readPemObject(); } catch (IOException e) { throw new IORuntimeException(e); } finally { IoUtil.close(pemReader); } } /** * 写出pem密钥(私钥、公钥、证书) * * @param type 密钥类型(私钥、公钥、证书) * @param content 密钥内容 * @param keyStream pem流 * @since 5.1.6 */ public static void writePemObject(String type, byte[] content, OutputStream keyStream) { writePemObject(new PemObject(type, content), keyStream); } /** * 写出pem密钥(私钥、公钥、证书) * * @param pemObject pem对象,包括密钥和密钥类型等信息 * @param keyStream pem流 * @since 5.1.6 */ public static void writePemObject(PemObjectGenerator pemObject, OutputStream keyStream) { PemWriter writer = null; try { writer = new PemWriter(IoUtil.getUtf8Writer(keyStream)); writer.writeObject(pemObject); } catch (IOException e) { throw new IORuntimeException(e); } finally { IoUtil.close(writer); } } }





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