Recognize the legacy OID 1.3.14.3.2.29 (sha1WithRSASignature) as equivalent to

net/cert/internal/signature_algorithm_unittest.cc

Index: net/cert/internal/signature_algorithm_unittest.cc
diff --git a/net/cert/internal/signature_algorithm_unittest.cc b/net/cert/internal/signature_algorithm_unittest.cc
index e89e015a40627a59fd62eb0fe1a57395aafeef7e..7bc0c86c4592b719ac69e058bd620ec6c4fd0970 100644
--- a/net/cert/internal/signature_algorithm_unittest.cc
+++ b/net/cert/internal/signature_algorithm_unittest.cc
@@ -88,6 +88,27 @@ TEST(SignatureAlgorithmTest, ParseDer_sha1WithRSAEncryption_NonNullParams) {
   ASSERT_FALSE(algorithm.ParseDer(der::Input(kData)));
 }
 
+// Parses a sha1WithRSASignature which contains a NULL parameters field.
+//
+//   SEQUENCE (2 elem)
+//       OBJECT IDENTIFIER  1.3.14.3.2.29
+//       NULL
+TEST(SignatureAlgorithmTest, ParseDer_sha1WithRSASignature_NullParams) {
+  // clang-format off
+  const uint8_t kData[] = {
+    0x30, 0x09,  // SEQUENCE (9 bytes)
+    0x06, 0x05,  // OBJECT IDENTIFIER (5 bytes)
+    0x2b, 0x0e, 0x03, 0x02, 0x1d,
+    0x05, 0x00,  // NULL (0 bytes)
+  };
+  // clang-format on
+  SignatureAlgorithm algorithm;
+  ASSERT_TRUE(algorithm.ParseDer(der::Input(kData)));
+
+  EXPECT_EQ(SignatureAlgorithmId::RsaPkcs1, algorithm.algorithm());
+  EXPECT_EQ(DigestAlgorithm::Sha1, algorithm.digest());
+}
+
 // Parses a sha-1WithRSAEncryption which contains values after the sequence.
 //
 //   SEQUENCE (1 elem)