cn.hutool.crypto.ASN1Util Maven / Gradle / Ivy
package cn.hutool.crypto;
import cn.hutool.core.io.FastByteArrayOutputStream;
import cn.hutool.core.io.IORuntimeException;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DLSequence;
import org.bouncycastle.asn1.util.ASN1Dump;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* ASN.1 – Abstract Syntax Notation dot one，抽象记法1 工具类。
* ASN.1描述了一种对数据进行表示、编码、传输和解码的数据格式。它的编码格式包括DER、BER、DL等
*
* @author looly
* @since 5.7.10
*/
public class ASN1Util {
/**
* 编码为DER格式
*
* @param elements ASN.1元素
* @return 编码后的bytes
*/
public static byte[] encodeDer(ASN1Encodable... elements) {
return encode(ASN1Encoding.DER, elements);
}
/**
* 编码为指定ASN1格式
*
* @param asn1Encoding 编码格式，见{@link ASN1Encoding}，可选DER、BER或DL
* @param elements ASN.1元素
* @return 编码后的bytes
*/
public static byte[] encode(String asn1Encoding, ASN1Encodable... elements) {
final FastByteArrayOutputStream out = new FastByteArrayOutputStream();
encodeTo(asn1Encoding, out, elements);
return out.toByteArray();
}
/**
* 编码为指定ASN1格式
*
* @param asn1Encoding 编码格式，见{@link ASN1Encoding}，可选DER、BER或DL
* @param out 输出流
* @param elements ASN.1元素
*/
public static void encodeTo(String asn1Encoding, OutputStream out, ASN1Encodable... elements) {
ASN1Sequence sequence;
switch (asn1Encoding) {
case ASN1Encoding.DER:
sequence = new DERSequence(elements);
break;
case ASN1Encoding.BER:
sequence = new BERSequence(elements);
break;
case ASN1Encoding.DL:
sequence = new DLSequence(elements);
break;
default:
throw new CryptoException("Unsupported ASN1 encoding: {}", asn1Encoding);
}
try {
sequence.encodeTo(out);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 读取ASN.1数据流为{@link ASN1Object}
*
* @param in ASN.1数据
* @return {@link ASN1Object}
*/
public static ASN1Object decode(InputStream in) {
final ASN1InputStream asn1In = new ASN1InputStream(in);
try {
return asn1In.readObject();
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 获取ASN1格式的导出格式，一般用于调试
*
* @param in ASN.1数据
* @return {@link ASN1Object}的字符串表示形式
* @see ASN1Dump#dumpAsString(Object)
*/
public static String getDumpStr(InputStream in) {
return ASN1Dump.dumpAsString(decode(in));
}
}