[refactor] Extract the CertVerifyResult assignment of has_md2, has_md4,

net/cert/x509_certificate_win.cc

Index: net/cert/x509_certificate_win.cc
diff --git a/net/cert/x509_certificate_win.cc b/net/cert/x509_certificate_win.cc
index c67011e06b9c783059b0804c2eb3e97fad473b30..ef3d040e5df1148055309e632c95384f02b885b7 100644
--- a/net/cert/x509_certificate_win.cc
+++ b/net/cert/x509_certificate_win.cc
@@ -421,6 +421,33 @@ void X509Certificate::GetPublicKeyInfo(OSCertHandle cert_handle,
   }
 }
 
+X509Certificate::SignatureHashAlgorithm
+X509Certificate::GetSignatureHashAlgorithm(OSCertHandle cert_handle) {
+  const char* algorithm = cert_handle->pCertInfo->SignatureAlgorithm.pszObjId;
+  if (strcmp(algorithm, szOID_RSA_MD5RSA) == 0) {
+    // md5WithRSAEncryption: 1.2.840.113549.1.1.4
+    return kSignatureHashAlgorithmMd5;
+  }
+  if (strcmp(algorithm, szOID_RSA_MD2RSA) == 0) {
+    // md2WithRSAEncryption: 1.2.840.113549.1.1.2
+    return kSignatureHashAlgorithmMd2;
+  }
+  if (strcmp(algorithm, szOID_RSA_MD4RSA) == 0) {
+    // md4WithRSAEncryption: 1.2.840.113549.1.1.3
+    return kSignatureHashAlgorithmMd4;
+  }
+  if (strcmp(algorithm, szOID_RSA_SHA1RSA) == 0 ||
+      strcmp(algorithm, szOID_X957_SHA1DSA) == 0 ||
+      strcmp(algorithm, szOID_ECDSA_SHA1) == 0) {
+    // sha1WithRSAEncryption: 1.2.840.113549.1.1.5
+    // id-dsa-with-sha1: 1.2.840.10040.4.3
+    // ecdsa-with-SHA1: 1.2.840.10045.4.1
+    return kSignatureHashAlgorithmSha1;
+  }
+
+  return kSignatureHashAlgorithmOther;
+}
+
 bool X509Certificate::IsIssuedByEncoded(
     const std::vector<std::string>& valid_issuers) {