Revert "[apkverify] Skip DSA SHA256 during apk verification"

This reverts commit c68b95b84de4b852b0e6480df459b8f8ec8d41e3.

Reason for revert: b/248068872

Test: atest libidsig.test
Change-Id: Ib978f23954fe6d901b4806d230e3067c4572083f
diff --git a/libs/apkverify/tests/apkverify_test.rs b/libs/apkverify/tests/apkverify_test.rs
index f2018a1..5bd901d 100644
--- a/libs/apkverify/tests/apkverify_test.rs
+++ b/libs/apkverify/tests/apkverify_test.rs
@@ -40,11 +40,22 @@
 }
 
 #[test]
-fn apks_signed_with_v3_dsa_sha256_are_not_supported() {
+fn test_verify_v3_dsa_sha256() {
     for key_name in KEY_NAMES_DSA.iter() {
         let res = verify(format!("tests/data/v3-only-with-dsa-sha256-{}.apk", key_name));
-        assert!(res.is_err(), "DSA algorithm is not supported for verification. See b/197052981.");
-        assert_contains(&res.unwrap_err().to_string(), "No supported signatures found");
+        assert!(res.is_err());
+        assert_contains(&res.unwrap_err().to_string(), "not implemented");
+    }
+}
+
+/// TODO(b/197052981): DSA algorithm is not yet supported.
+#[test]
+fn apks_signed_with_v3_dsa_sha256_have_valid_apk_digest() {
+    for key_name in KEY_NAMES_DSA.iter() {
+        validate_apk_digest(
+            format!("tests/data/v3-only-with-dsa-sha256-{}.apk", key_name),
+            SignatureAlgorithmID::DsaWithSha256,
+        );
     }
 }
 
@@ -91,6 +102,7 @@
 #[test]
 fn test_verify_v3_sig_does_not_verify() {
     let path_list = [
+        "tests/data/v3-only-with-dsa-sha256-2048-sig-does-not-verify.apk",
         "tests/data/v3-only-with-ecdsa-sha512-p521-sig-does-not-verify.apk",
         "tests/data/v3-only-with-rsa-pkcs1-sha256-3072-sig-does-not-verify.apk",
     ];
@@ -106,9 +118,16 @@
 
 #[test]
 fn test_verify_v3_digest_mismatch() {
-    let res = verify("tests/data/v3-only-with-rsa-pkcs1-sha512-8192-digest-mismatch.apk");
-    assert!(res.is_err());
-    assert_contains(&res.unwrap_err().to_string(), "Digest mismatch");
+    let path_list = [
+        "tests/data/v3-only-with-dsa-sha256-3072-digest-mismatch.apk",
+        "tests/data/v3-only-with-rsa-pkcs1-sha512-8192-digest-mismatch.apk",
+    ];
+    for path in path_list.iter() {
+        let res = verify(path);
+        assert!(res.is_err());
+        let error_msg = &res.unwrap_err().to_string();
+        assert!(error_msg.contains("Digest mismatch") || error_msg.contains("not implemented"));
+    }
 }
 
 #[test]