android根据包名获取签名MD5信息

private Signature[] getRawSignature(Context paramContext, String paramString) {
        if ((paramString == null) || (paramString.length() == 0)) {
            errout("getSignature, packageName is null");
            return null;
        }
        PackageManager localPackageManager = paramContext.getPackageManager();
        PackageInfo localPackageInfo;
        try {
            localPackageInfo = localPackageManager.getPackageInfo(paramString, PackageManager.GET_SIGNATURES);
            if (localPackageInfo == null) {
                errout("info is null, packageName = " + paramString);
                return null;
            }
        } catch (PackageManager.NameNotFoundException localNameNotFoundException) {
            errout("NameNotFoundException");
            return null;
        }
        return localPackageInfo.signatures;
    }

private void getSign(String packageName) {
        Signature[] arrayOfSignature = getRawSignature(this, packageName);
        if ((arrayOfSignature == null) || (arrayOfSignature.length == 0)) {
            errout("signs is null");
            return;
        }
        stdout(MD5.getMessageDigest(arrayOfSignature[0].toByteArray()));
    }

源码地址： GenSignature