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【Java】 Android 获取签名公钥

作者: / 发布于2013/8/20/ 805


	public class GetPublicKey {
	
	/**
	 * 获取签名公钥
	 * @param mContext
	 * @return
	 */
	protected static String getSignInfo(Context mContext) {
	 String signcode = "";
	 try {
	 PackageInfo packageInfo = mContext.getPackageManager().getPackageInfo(
	 GetAppInfo.getPackageName(mContext), PackageManager.GET_SIGNATURES);
	 Signature[] signs = packageInfo.signatures;
	 Signature sign = signs[0];

	 signcode = parseSignature(sign.toByteArray());
	 signcode = signcode.toLowerCase();
	 } catch (Exception e) {
	 Log.e(Constants.TAG, e.getMessage(), e);
	 }
	 return signcode;
	}

	protected static String parseSignature(byte[] signature) {
	 String sign = "";
	 try {
	 CertificateFactory certFactory = CertificateFactory
	 .getInstance("X.509");
	 X509Certificate cert = (X509Certificate) certFactory
	 .generateCertificate(new ByteArrayInputStream(signature));
	 String pubKey = cert.getPublicKey().toString();
	 String ss = subString(pubKey);
	 ss = ss.replace(",", "");
	 ss = ss.toLowerCase();
	 int aa = ss.indexOf("modulus");
	 int bb = ss.indexOf("publicexponent");
	 sign = ss.substring(aa + 8, bb);
	 } catch (CertificateException e) {
	 Log.e(Constants.TAG, e.getMessage(), e);
	 }
	 return sign;
	}

	public static String subString(String sub) {
	 Pattern pp = Pattern.compile("\\s*|\t|\r|\n");
	 Matcher mm = pp.matcher(sub);
	 return mm.replaceAll("");
	}
	}

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　签名公钥　

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