非android环境获取apk签名信息

前段时间在工作中遇到一个问题，即在非android环境下获取apk签名信息，网上查了不少资料整理出一份代码，分享出来希望对看到的人有所帮助。

主要思路：读META-INF/路径下的证书，获取签名信息后，转换成字符数组(tochar方法是关键)。

解决方法整理程序如下：

private static char[] toChars(byte[] mSignature) {
	    byte[] sig = mSignature;
	    final int N = sig.length;
	    final int N2 = N*2;
	    char[] text = new char[N2];
	    
	    for(int j=0;j<N;j++){
	    	byte v = sig[j];
	    	int d = (v>>4)&0xf;
	    	text[j*2] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d));
	    	d = v&0xf;
	    	text[j*2+1] = (char)(d >= 10 ? ('a' + d - 10) : ('0' + d));
	    }
	    return text;
	}
	
	private static java.security.cert.Certificate[] loadCertificates(JarFile jarFile, JarEntry je, byte[] readBuffer) {
		try {
			InputStream is = jarFile.getInputStream(je);
			while(is.read(readBuffer,0,readBuffer.length)!=-1) {
				
			}
			is.close();
			return (java.security.cert.Certificate[])(je!=null?je.getCertificates():null);
		} catch (Exception e) {
			e.printStackTrace();
			System.err.println("Exception reading "+je.getName()+" in "+jarFile.getName()+": "+e);
		}
		return null;
	}

public static String getApkSignInfo(String apkFilePath){
		byte[] readBuffer = new byte[8192];
		java.security.cert.Certificate[] certs = null;
		try{
			JarFile jarFile = new JarFile(apkFilePath);
			Enumeration entries = jarFile.entries();
			while(entries.hasMoreElements()){
				JarEntry je = (JarEntry)entries.nextElement();
			    if(je.isDirectory()){
			        continue;
			    }
			    if(je.getName().startsWith("META-INF/")){
			    	continue;
			    }
			    java.security.cert.Certificate[] localCerts = loadCertificates(jarFile,je,readBuffer);
			    System.out.println("File " + apkFilePath + " entry " + je.getName()+ ": certs=" + certs + " ("+ (certs != null ? certs.length : 0) + ")");
			    if (certs == null) {
				    certs = localCerts;
				}else{
					for(int i=0; i<certs.length; i++){
					    boolean found = false;
					    for (int j = 0; j < localCerts.length; j++) {
					    	if (certs[i] != null && certs[i].equals(localCerts[j])) {
					    		  found = true;
					    		  break;
					        }
					    }
					    if (!found || certs.length != localCerts.length) {
					    	  jarFile.close();
					    	  return null;
					    }
					}
				}
			}
			jarFile.close();
			return new String(toChars(certs[0].getEncoded()));
		}catch(Exception e){
			e.printStackTrace();
		}
		return null;
	}

 

欢迎拍砖！