crypt32: Implement decoding of X509_ECC_SIGNATURE.

dlls/crypt32/decode.c

@@ -6013,6 +6013,35 @@ static BOOL WINAPI CRYPT_AsnDecodeObjectIdentifier(DWORD dwCertEncodingType,
     return ret;
 }
 
+static BOOL WINAPI CRYPT_AsnDecodeEccSignature(DWORD dwCertEncodingType,
+ LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
+ CRYPT_DECODE_PARA *pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
+{
+    BOOL ret;
+    struct AsnDecodeSequenceItem items[] = {
+     { ASN_INTEGER, offsetof(CERT_ECC_SIGNATURE, r),
+       CRYPT_AsnDecodeUnsignedIntegerInternal, sizeof(CRYPT_UINT_BLOB), FALSE,
+       TRUE, offsetof(CERT_ECC_SIGNATURE, r.pbData), 0 },
+     { ASN_INTEGER, offsetof(CERT_ECC_SIGNATURE, s),
+       CRYPT_AsnDecodeUnsignedIntegerInternal, sizeof(CRYPT_UINT_BLOB), FALSE,
+       TRUE, offsetof(CERT_ECC_SIGNATURE, s.pbData), 0 },
+    };
+
+    __TRY
+    {
+        ret = CRYPT_AsnDecodeSequence(items, ARRAY_SIZE(items),
+         pbEncoded, cbEncoded, dwFlags, pDecodePara, pvStructInfo,
+         pcbStructInfo, NULL, NULL);
+    }
+    __EXCEPT_PAGE_FAULT
+    {
+        SetLastError(STATUS_ACCESS_VIOLATION);
+        ret = FALSE;
+    }
+    __ENDTRY
+    return ret;
+}
+
 static CryptDecodeObjectExFunc CRYPT_GetBuiltinDecoder(DWORD dwCertEncodingType,
  LPCSTR lpszStructType)
 {
@@ -6155,6 +6184,9 @@ static CryptDecodeObjectExFunc CRYPT_GetBuiltinDecoder(DWORD dwCertEncodingType,
         case LOWORD(X509_OBJECT_IDENTIFIER):
             decodeFunc = CRYPT_AsnDecodeObjectIdentifier;
             break;
+        case LOWORD(X509_ECC_SIGNATURE):
+            decodeFunc = CRYPT_AsnDecodeEccSignature;
+            break;
         }
     }
     else if (!strcmp(lpszStructType, szOID_CERT_EXTENSIONS))