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Check XCI signature validity

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Alex Barney 2018-09-13 14:07:28 -05:00
parent 8230b0ba75
commit c321f65f2a
2 changed files with 54 additions and 0 deletions
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19
LibHac/Crypto.cs
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@ -142,6 +142,25 @@ namespace LibHac
}
}
public static bool Rsa2048Pkcs1Verify(byte[] data, byte[] signature, byte[] modulus)
{
byte[] hash;
using (SHA256 sha256 = SHA256.Create())
{
hash = sha256.ComputeHash(data);
}
using (var rsa = new RSACryptoServiceProvider())
{
rsa.ImportParameters(new RSAParameters() { Exponent = new byte[] { 1, 0, 1 }, Modulus = modulus });
var rsaFormatter = new RSAPKCS1SignatureDeformatter(rsa);
rsaFormatter.SetHashAlgorithm("SHA256");
return rsaFormatter.VerifySignature(hash, signature);
}
}
public static byte[] DecryptTitleKey(byte[] titleKeyblock, RSAParameters rsaParams)
{
#if USE_RSA_CNG

35
LibHac/XciHeader.cs
View file

@ -10,6 +10,26 @@ namespace LibHac
private const string HeaderMagic = "HEAD";
private const int EncryptedHeaderSize = 0x70;
private readonly byte[] _xciHeaderPubk =
{
0x98, 0xC7, 0x26, 0xB6, 0x0D, 0x0A, 0x50, 0xA7, 0x39, 0x21, 0x0A, 0xE3, 0x2F, 0xE4, 0x3E, 0x2E,
0x5B, 0xA2, 0x86, 0x75, 0xAA, 0x5C, 0xEE, 0x34, 0xF1, 0xA3, 0x3A, 0x7E, 0xBD, 0x90, 0x4E, 0xF7,
0x8D, 0xFA, 0x17, 0xAA, 0x6B, 0xC6, 0x36, 0x6D, 0x4C, 0x9A, 0x6D, 0x57, 0x2F, 0x80, 0xA2, 0xBC,
0x38, 0x4D, 0xDA, 0x99, 0xA1, 0xD8, 0xC3, 0xE2, 0x99, 0x79, 0x36, 0x71, 0x90, 0x20, 0x25, 0x9D,
0x4D, 0x11, 0xB8, 0x2E, 0x63, 0x6B, 0x5A, 0xFA, 0x1E, 0x9C, 0x04, 0xD1, 0xC5, 0xF0, 0x9C, 0xB1,
0x0F, 0xB8, 0xC1, 0x7B, 0xBF, 0xE8, 0xB0, 0xD2, 0x2B, 0x47, 0x01, 0x22, 0x6B, 0x23, 0xC9, 0xD0,
0xBC, 0xEB, 0x75, 0x6E, 0x41, 0x7D, 0x4C, 0x26, 0xA4, 0x73, 0x21, 0xB4, 0xF0, 0x14, 0xE5, 0xD9,
0x8D, 0xB3, 0x64, 0xEE, 0xA8, 0xFA, 0x84, 0x1B, 0xB8, 0xB8, 0x7C, 0x88, 0x6B, 0xEF, 0xCC, 0x97,
0x04, 0x04, 0x9A, 0x67, 0x2F, 0xDF, 0xEC, 0x0D, 0xB2, 0x5F, 0xB5, 0xB2, 0xBD, 0xB5, 0x4B, 0xDE,
0x0E, 0x88, 0xA3, 0xBA, 0xD1, 0xB4, 0xE0, 0x91, 0x81, 0xA7, 0x84, 0xEB, 0x77, 0x85, 0x8B, 0xEF,
0xA5, 0xE3, 0x27, 0xB2, 0xF2, 0x82, 0x2B, 0x29, 0xF1, 0x75, 0x2D, 0xCE, 0xCC, 0xAE, 0x9B, 0x8D,
0xED, 0x5C, 0xF1, 0x8E, 0xDB, 0x9A, 0xD7, 0xAF, 0x42, 0x14, 0x52, 0xCD, 0xE3, 0xC5, 0xDD, 0xCE,
0x08, 0x12, 0x17, 0xD0, 0x7F, 0x1A, 0xAA, 0x1F, 0x7D, 0xE0, 0x93, 0x54, 0xC8, 0xBC, 0x73, 0x8A,
0xCB, 0xAD, 0x6E, 0x93, 0xE2, 0x19, 0x72, 0x6B, 0xD3, 0x45, 0xF8, 0x73, 0x3D, 0x2B, 0x6A, 0x55,
0xD2, 0x3A, 0x8B, 0xB0, 0x8A, 0x42, 0xE3, 0x3D, 0xF1, 0x92, 0x23, 0x42, 0x2E, 0xBA, 0xCC, 0x9C,
0x9A, 0xC1, 0xDD, 0x62, 0x86, 0x9C, 0x2E, 0xE1, 0x2D, 0x6F, 0x62, 0x67, 0x51, 0x08, 0x0E, 0xCF
};
public byte[] Signature { get; set; }
public string Magic { get; set; }
public int RomAreaStartPage { get; set; }
@ -42,6 +62,8 @@ namespace LibHac
public byte[] UppHash { get; set; }
public ulong UppId { get; set; }
public Validity SignatureValidity { get; set; }
public XciHeader(Keyset keyset, Stream stream)
{
var reader = new BinaryReader(stream, Encoding.Default, true);
@ -52,6 +74,19 @@ namespace LibHac
throw new InvalidDataException("Invalid XCI file: Header magic invalid.");
}
reader.BaseStream.Position = SignatureSize;
byte[] sigData = reader.ReadBytes(SignatureSize);
reader.BaseStream.Position = SignatureSize + 4;
if (Crypto.Rsa2048Pkcs1Verify(sigData, Signature, _xciHeaderPubk))
{
SignatureValidity = Validity.Valid;
}
else
{
SignatureValidity = Validity.Invalid;
}
RomAreaStartPage = reader.ReadInt32();
BackupAreaStartPage = reader.ReadInt32();
byte keyIndex = reader.ReadByte();