非android环境获取apk签名信息
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;}
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