com.jchanghong.crypto.PemUtil Maven / Gradle / Ivy
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);
}
}
}