Ejemplo n.º 1
0
        public static Validity ValidateSectionMasterHash(this Nca nca, int index)
        {
            if (!nca.SectionExists(index))
            {
                throw new ArgumentException(nameof(index), Messages.NcaSectionMissing);
            }
            if (!nca.CanOpenSection(index))
            {
                return(Validity.MissingKey);
            }

            NcaFsHeader header = nca.Header.GetFsHeader(index);

            // The base data is needed to validate the hash, so use a trick involving the AES-CTR extended
            // encryption table to check if the decryption is invalid.
            // todo: If the patch replaces the data checked by the master hash, use that directly
            if (header.IsPatchSection())
            {
                if (header.EncryptionType != NcaEncryptionType.AesCtrEx)
                {
                    return(Validity.Unchecked);
                }

                Validity ctrExValidity = ValidateCtrExDecryption(nca, index);
                return(ctrExValidity == Validity.Invalid ? Validity.Invalid : Validity.Unchecked);
            }

            byte[] expectedHash;
            long   offset;
            long   size;

            switch (header.HashType)
            {
            case NcaHashType.Ivfc:
                NcaFsIntegrityInfoIvfc ivfcInfo = header.GetIntegrityInfoIvfc();

                expectedHash = ivfcInfo.MasterHash.ToArray();
                offset       = ivfcInfo.GetLevelOffset(0);
                size         = 1 << ivfcInfo.GetLevelBlockSize(0);

                break;

            case NcaHashType.Sha256:
                NcaFsIntegrityInfoSha256 sha256Info = header.GetIntegrityInfoSha256();
                expectedHash = sha256Info.MasterHash.ToArray();

                offset = sha256Info.GetLevelOffset(0);
                size   = sha256Info.GetLevelSize(0);

                break;

            default:
                return(Validity.Unchecked);
            }

            IStorage storage = nca.OpenRawStorage(index);

            var data = new byte[size];

            storage.Read(data, offset);

            byte[] actualHash = Crypto.ComputeSha256(data, 0, data.Length);

            if (Util.ArraysEqual(expectedHash, actualHash))
            {
                return(Validity.Valid);
            }

            return(Validity.Invalid);
        }
Ejemplo n.º 2
0
 public static void ExportSection(this Nca nca, NcaSectionType type, string filename, bool raw = false,
                                  IntegrityCheckLevel integrityCheckLevel = IntegrityCheckLevel.None, IProgressReport logger = null)
 {
     nca.OpenStorage(type, integrityCheckLevel, raw)
     .WriteAllBytes(filename, logger);
 }