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future
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import java.util.Base64;
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import java.math.BigInteger;
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import java.io.ByteArrayInputStream;
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public class KeyAnalyzer {
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public static void main(String[] args) {
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String privateKeyBase64 = "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";
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System.out.println("========== 密钥分析开始 ==========");
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System.out.println("密钥长度: " + privateKeyBase64.length());
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byte[] keyBytes = Base64.getDecoder().decode(privateKeyBase64);
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System.out.println("解码后长度: " + keyBytes.length + " bytes");
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// 打印前30字节
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System.out.print("前30字节(hex): ");
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for (int i = 0; i < 30 && i < keyBytes.length; i++) {
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System.out.printf("%02X ", keyBytes[i]);
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}
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System.out.println();
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// 解析ASN.1结构
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try {
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parseASN1(keyBytes);
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} catch (Exception e) {
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System.out.println("解析失败: " + e.getMessage());
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e.printStackTrace();
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}
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}
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static void parseASN1(byte[] keyBytes) throws Exception {
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ByteArrayInputStream bis = new ByteArrayInputStream(keyBytes);
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// 读取SEQUENCE
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int tag = bis.read();
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System.out.println("第一个tag: 0x" + Integer.toHexString(tag));
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if (tag == 0x30) {
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System.out.println("这是SEQUENCE");
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// 读取长度
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int len = readASN1Length(bis);
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System.out.println("SEQUENCE长度: " + len);
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// 检查下一个tag
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int nextTag = bis.read();
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System.out.println("下一个tag: 0x" + Integer.toHexString(nextTag));
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if (nextTag == 0x02) {
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// INTEGER
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int intLen = readASN1Length(bis);
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byte[] versionBytes = new byte[intLen];
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bis.read(versionBytes);
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int version = new BigInteger(versionBytes).intValue();
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System.out.println("版本INTEGER值: " + version);
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// 检查这是PKCS#8还是PKCS#1
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// PKCS#8: version=0后是SEQUENCE(算法标识符)
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// PKCS#1: version=0后是INTEGER(modulus)
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int afterVersionTag = bis.read();
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System.out.println("版本后的tag: 0x" + Integer.toHexString(afterVersionTag));
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if (afterVersionTag == 0x30) {
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System.out.println(">>> 这是PKCS#8格式 (version后是SEQUENCE)");
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// 解析PKCS#8
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// AlgorithmIdentifier: SEQUENCE { OID, NULL }
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int algLen = readASN1Length(bis);
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System.out.println("AlgorithmIdentifier长度: " + algLen);
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// 跳过AlgorithmIdentifier内容
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byte[] algBytes = new byte[algLen];
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bis.read(algBytes);
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// 打印OID
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System.out.print("OID bytes: ");
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for (int i = 0; i < algBytes.length; i++) {
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System.out.printf("%02X ", algBytes[i]);
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}
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System.out.println();
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// 下一个应该是OCTET STRING (包含私钥)
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int octetTag = bis.read();
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System.out.println("下一个tag: 0x" + Integer.toHexString(octetTag));
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if (octetTag == 0x04) {
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System.out.println("这是OCTET STRING (包含私钥数据)");
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int octetLen = readASN1Length(bis);
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System.out.println("OCTET STRING长度: " + octetLen);
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// OCTET STRING内容是PKCS#1私钥
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byte[] pkcs1Bytes = new byte[octetLen];
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bis.read(pkcs1Bytes);
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System.out.print("PKCS#1私钥前20字节: ");
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for (int i = 0; i < 20; i++) {
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System.out.printf("%02X ", pkcs1Bytes[i]);
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}
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System.out.println();
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// 解析PKCS#1私钥
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ByteArrayInputStream pkcs1Stream = new ByteArrayInputStream(pkcs1Bytes);
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int pkcs1Tag = pkcs1Stream.read();
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System.out.println("PKCS#1第一个tag: 0x" + Integer.toHexString(pkcs1Tag));
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if (pkcs1Tag == 0x30) {
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int pkcs1Len = readASN1Length(pkcs1Stream);
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System.out.println("PKCS#1 SEQUENCE长度: " + pkcs1Len);
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// version
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int vTag = pkcs1Stream.read();
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int vLen = readASN1Length(pkcs1Stream);
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byte[] vBytes = new byte[vLen];
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pkcs1Stream.read(vBytes);
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System.out.println("PKCS#1版本: " + new BigInteger(vBytes));
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// 解析私钥参数
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parsePKCS1(pkcs1Stream);
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}
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}
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} else if (afterVersionTag == 0x02) {
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System.out.println(">>> 这是PKCS#1格式 (version后是INTEGER)");
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// 继续解析PKCS#1
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parsePKCS1(bis);
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} else {
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System.out.println(">>> 未知格式 (tag: 0x" + Integer.toHexString(afterVersionTag) + ")");
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}
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}
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}
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}
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static void parsePKCS1(ByteArrayInputStream bis) throws Exception {
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System.out.println("\n========== 解析PKCS#1私钥参数 ==========");
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// modulus
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BigInteger modulus = readASN1Integer(bis);
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System.out.println("modulus长度: " + modulus.bitLength() + " bits");
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// publicExponent
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BigInteger publicExponent = readASN1Integer(bis);
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System.out.println("publicExponent: " + publicExponent);
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// privateExponent
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BigInteger privateExponent = readASN1Integer(bis);
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System.out.println("privateExponent长度: " + privateExponent.bitLength() + " bits");
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// prime1
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BigInteger prime1 = readASN1Integer(bis);
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System.out.println("prime1长度: " + prime1.bitLength() + " bits");
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// prime2
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BigInteger prime2 = readASN1Integer(bis);
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System.out.println("prime2长度: " + prime2.bitLength() + " bits");
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// 验证 prime1 * prime2 == modulus
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BigInteger calculatedModulus = prime1.multiply(prime2);
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boolean valid = calculatedModulus.equals(modulus);
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System.out.println("\n验证 prime1 * prime2 == modulus: " + valid);
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if (!valid) {
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System.out.println(">>> 密钥数学关系不正确！这是无效的RSA私钥");
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System.out.println("计算得到的modulus长度: " + calculatedModulus.bitLength() + " bits");
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}
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// exponent1
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BigInteger exponent1 = readASN1Integer(bis);
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System.out.println("exponent1长度: " + exponent1.bitLength() + " bits");
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// exponent2
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BigInteger exponent2 = readASN1Integer(bis);
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System.out.println("exponent2长度: " + exponent2.bitLength() + " bits");
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// coefficient
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BigInteger coefficient = readASN1Integer(bis);
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System.out.println("coefficient长度: " + coefficient.bitLength() + " bits");
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System.out.println("\n========== 解析完成 ==========");
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}
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static int readASN1Length(ByteArrayInputStream bis) throws Exception {
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int firstByte = bis.read();
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if ((firstByte & 0x80) == 0) {
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return firstByte;
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}
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int numBytes = firstByte & 0x7F;
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int length = 0;
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for (int i = 0; i < numBytes; i++) {
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length = (length << 8) | (bis.read() & 0xFF);
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}
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return length;
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}
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static BigInteger readASN1Integer(ByteArrayInputStream bis) throws Exception {
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int tag = bis.read();
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if (tag != 0x02) throw new Exception("期望INTEGER tag: 0x02, 实际: 0x" + Integer.toHexString(tag));
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int len = readASN1Length(bis);
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byte[] data = new byte[len];
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bis.read(data);
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return new BigInteger(1, data);
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}
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}
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