Validate AIDs when registered. (1bfc3d62) · Commits · e / os / android_frameworks_base

core/java/android/nfc/cardemulation/AidGroup.java

+6 −1

Original line number	Diff line number	Diff line
		@@ -16,7 +16,7 @@ import android.util.Log;
		* The AidGroup class represents a group of Application Identifiers (AIDs).
		*
		* <p>An instance of this object can be used with
		* {@link CardEmulation#registerAidGroupForService(android.content.ComponentName, AidGroup)}
		* {@link CardEmulation#registerAidsForService(android.content.ComponentName, String, java.util.List)}
		* to tell the OS which AIDs are handled by your HCE- or SE-based service.
		*
		* <p>The format of AIDs is defined in the ISO/IEC 7816-4 specification. This class
		@@ -50,6 +50,11 @@ public final class AidGroup implements Parcelable {
		if (aids.size() > MAX_NUM_AIDS) {
		throw new IllegalArgumentException("Too many AIDs in AID group.");
		}
		for (String aid : aids) {
		if (!ApduServiceInfo.isValidAid(aid)) {
		throw new IllegalArgumentException("AID " + aid + " is not a valid AID.");
		}
		}
		if (isValidCategory(category)) {
		this.category = category;
		} else {

+23 −6

Original line number	Diff line number	Diff line
		@@ -351,20 +351,37 @@ public final class ApduServiceInfo implements Parcelable {
		}
		}

		/**
		* A valid AID according to ISO/IEC 7816-4:
		* <ul>
		* <li>Has >= 5 bytes and <=16 bytes (>=10 hex chars and <= 32 hex chars)
		* <li>Consist of only hex characters
		* <li>Additionally, we allow an asterisk at the end, to indicate
		* a prefix
		* </ul>
		*/
		static boolean isValidAid(String aid) {
		if (aid == null)
		return false;

		int aidLength = aid.length();
		if (aidLength == 0 \|\| (aidLength % 2) != 0) {
		Log.e(TAG, "AID " + aid + " is not correctly formatted.");
		// If a prefix AID, the total length must be odd (even # of AID chars + '*')
		if (aid.endsWith("*") && ((aid.length() % 2) == 0)) {
		Log.e(TAG, "AID " + aid + " is not a valid AID.");
		return false;
		}
		// Minimum AID length is 5 bytes, 10 hex chars
		if (aidLength < 10) {
		Log.e(TAG, "AID " + aid + " is shorter than 5 bytes.");

		// If not a prefix AID, the total length must be even (even # of AID chars)
		if (!aid.endsWith("*") && ((aid.length() % 2) != 0)) {
		Log.e(TAG, "AID " + aid + " is not a valid AID.");
		return false;
		}

		// Verify hex characters
		if (!aid.matches("[0-9A-Fa-f]{10,32}\\*?")) {
		Log.e(TAG, "AID " + aid + " is not a valid AID.");
		return false;
		}

		return true;
		}