public DSIGInfo(string filename)
{
fontfile = new OTFile();
tDSIG = null;
Warn_TTCv1 = false;
Warn_DSIG_in_memFonts = false;
Warn_MalformedSIG = false;
usNumSigs = 0;
if (!fontfile.open(filename))
{
throw new IOException("Cannot open file " + filename);
}
TTCHeader ttc = null;
if (fontfile.IsCollection())
{
ttc = fontfile.GetTTCHeader();
if (fontfile.GetTableManager().GetUnaliasedTableName(ttc.DsigTag) == "DSIG")
{
MBOBuffer buf = fontfile.ReadPaddedBuffer(ttc.DsigOffset, ttc.DsigLength);
tDSIG = (Table_DSIG)fontfile.GetTableManager().CreateTableObject(ttc.DsigTag, buf);
}
for (uint i = 0; i < fontfile.GetNumFonts(); i++)
{
OTFont fn = fontfile.GetFont(i);
Table_DSIG memDSIG = (Table_DSIG)fn.GetTable("DSIG");
if (memDSIG != null)
{
Warn_DSIG_in_memFonts = true;
break;
}
}
}
else
{
OTFont fn = fontfile.GetFont(0);
tDSIG = (Table_DSIG)fn.GetTable("DSIG");
}
HaveDSIG = ((tDSIG == null) ? false : true);
// Officially we should only warn if HaveDSIG true
if (fontfile.IsCollection() && ttc.version != 0x00020000)
{
Warn_TTCv1 = true;
}
if (HaveDSIG)
{
FurtherWork();
}
}
static byte[] get_TTF_digest(OTFile f)
{
OTFont fn = f.GetFont(0);
Table_DSIG tDSIG = (Table_DSIG)fn.GetTable("DSIG");
DirectoryEntry deDSIG = null;
// sort table by offset
Dictionary <uint, int> offsetlookup = new Dictionary <uint, int>();
var list = new List <uint>();
for (ushort i = 0; i < fn.GetNumTables(); i++)
{
DirectoryEntry de = fn.GetDirectoryEntry(i);
offsetlookup.Add(de.offset, i);
list.Add(de.offset);
if ((string)de.tag == "DSIG")
{
deDSIG = de;
}
}
list.Sort();
// New offset table
var old_ot = fn.GetOffsetTable();
OffsetTable ot = new OffsetTable(old_ot.sfntVersion, (ushort)(old_ot.numTables - 1));
for (ushort i = 0; i < fn.GetNumTables(); i++)
{
DirectoryEntry oldde = fn.GetDirectoryEntry(i);
if ((string)oldde.tag != "DSIG")
{
DirectoryEntry de = new DirectoryEntry(oldde);
de.offset -= 16; // one less entry
if (de.offset > deDSIG.offset)
{
de.offset -= tDSIG.GetBuffer().GetPaddedLength();
}
ot.DirectoryEntries.Add(de);
}
}
hash.TransformBlock(ot.m_buf.GetBuffer(), 0, (int)ot.m_buf.GetLength(), ot.m_buf.GetBuffer(), 0);
for (int i = 0; i < ot.DirectoryEntries.Count; i++)
{
DirectoryEntry de = (DirectoryEntry)ot.DirectoryEntries[i];
hash.TransformBlock(de.m_buf.GetBuffer(), 0, (int)de.m_buf.GetLength(), de.m_buf.GetBuffer(), 0);
}
Table_head headTable = (Table_head)fn.GetTable("head");
// calculate the checksum
uint sum = 0;
sum += ot.CalcOffsetTableChecksum();
sum += ot.CalcDirectoryEntriesChecksum();
foreach (var key in list)
{
OTTable table = fn.GetTable((ushort)offsetlookup[key]);
if ((string)table.GetTag() != "DSIG")
{
sum += table.CalcChecksum();
}
}
Table_head.head_cache headCache = (Table_head.head_cache)headTable.GetCache();
// set the checkSumAdujustment field
headCache.checkSumAdjustment = 0xb1b0afba - sum;
Table_head newHead = (Table_head)headCache.GenerateTable();
foreach (var key in list)
{
OTTable table = fn.GetTable((ushort)offsetlookup[key]);
if ((string)table.GetTag() == "head")
{
table = newHead;
}
if ((string)table.GetTag() != "DSIG")
{
hash.TransformBlock(table.m_bufTable.GetBuffer(), 0, (int)table.GetBuffer().GetPaddedLength(),
table.m_bufTable.GetBuffer(), 0);
}
}
byte[] usFlag = { 0, 1 };
hash.TransformFinalBlock(usFlag, 0, 2);
return(hash.Hash);
}
static int Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("DSIGInfo [-v] [-v] [-v] fontfile");
return(0);
}
OTFile f = new OTFile();
Table_DSIG tDSIG = null;
string filename = null;
verbose = 0;
for (int i = 0; i < args.Length; i++)
{
if ("-v" == args[i])
{
verbose++;
}
else
{
filename = args[i];
}
}
if (!f.open(filename))
{
Console.WriteLine("Error: Cannot open {0} as font file", filename);
return(0);
}
TTCHeader ttc = null;
if (f.IsCollection())
{
ttc = f.GetTTCHeader();
if (f.GetTableManager().GetUnaliasedTableName(ttc.DsigTag) == "DSIG")
{
MBOBuffer buf = f.ReadPaddedBuffer(ttc.DsigOffset, ttc.DsigLength);
tDSIG = (Table_DSIG)f.GetTableManager().CreateTableObject(ttc.DsigTag, buf);
}
for (uint i = 0; i < f.GetNumFonts(); i++)
{
OTFont fn = f.GetFont(i);
Table_DSIG memDSIG = (Table_DSIG)fn.GetTable("DSIG");
if (memDSIG != null)
{
Console.WriteLine("Warning: DSIG in member font");
break;
}
}
}
else
{
OTFont fn = f.GetFont(0);
tDSIG = (Table_DSIG)fn.GetTable("DSIG");
}
Console.WriteLine("{0} DSIG table: {1}", filename,
(tDSIG == null) ? "Absent" : "Present");
if (tDSIG == null)
{
return(0);
}
if (f.IsCollection() && ttc.version != 0x00020000)
{
Console.WriteLine("Warning: TTC has DSIG but header version is 0x{0}, != 0x00020000", ttc.version.ToString("X8"));
}
if (tDSIG.usNumSigs != 1)
{
Console.WriteLine("NumSigs = {0}", tDSIG.usNumSigs);
}
for (uint v = 0; v < tDSIG.usNumSigs; v++)
{
Table_DSIG.SignatureBlock sgb;
try {
sgb = tDSIG.GetSignatureBlock(v);
} catch (IndexOutOfRangeException)
{
Console.WriteLine("Error: Out of Range SignatureBlock {0}", v);
break;
}
SignedCms cms = new SignedCms();
try
{
cms.Decode(sgb.bSignature);
}
catch (Exception e)
{
if (e is NullReferenceException || /* Mono */
e is CryptographicException /* .Net2 */)
{
Console.WriteLine("Error: Malformed Signature");
break;
}
Console.WriteLine("Error: Malformed Signature (Unexpected Case 1)");
throw;
}
if (cms.SignerInfos.Count > 1)
{
Console.WriteLine("#SignerInfos: {0}", cms.SignerInfos.Count);
}
foreach (var si in cms.SignerInfos)
{
Console.WriteLine(si.Certificate);
if (Type.GetType("Mono.Runtime") == null)
{
foreach (var ua in si.UnsignedAttributes)
{
foreach (var asnd in ua.Values)
{
try
{
ASN1 vv = new ASN1(asnd.RawData);
ASN1 t = new ASN1(vv[3][1][1].Value);
Console.WriteLine("Decoded Signing Time: {0}", ASN1Convert.ToDateTime(t));
}
catch (Exception)
{ /* Nothing to do */ }
}
}
}
}
Console.WriteLine("#Certificates: {0}", cms.Certificates.Count);
#if HAVE_MONO_X509
certs = new Mono.Security.X509.X509CertificateCollection();
//Mono.Security.X509.X509Chain signerChain = new Mono.Security.X509.X509Chain ();
#endif
foreach (var x509 in cms.Certificates)
{
#if HAVE_MONO_X509
certs.Add(new Mono.Security.X509.X509Certificate(x509.RawData));
#endif
if (verbose > 0)
{
Console.WriteLine(x509);
}
else
{
Console.WriteLine(x509.Subject);
}
}
;
#if HAVE_MONO_X509
Mono.Security.X509.X509Certificate x = new Mono.Security.X509.X509Certificate(cms.SignerInfos[0].Certificate.RawData);
Mono.Security.X509.X509Certificate parent = x;
while (x != null) // Self-signed is fine - the font bundled CA is self-signed.
{
parent = x; // last valid
x = FindCertificateParent(x);
if (x != null && x.Equals(parent))
{
break;
}
}
#endif
// Windows 10/.net 4.6.x throws here
ASN1 spc;
try
{
spc = new ASN1(cms.ContentInfo.Content);
}
catch (Exception e)
{
if (e is IndexOutOfRangeException)
{
Console.WriteLine("Error: Malformed Signature (Win10/.net 4.6.x)");
break;
}
Console.WriteLine("Error: Malformed Signature (Unexpected Case 2)");
throw;
}
ASN1 playload_oid = null;
ASN1 oid = null;
ASN1 digest = null;
ASN1 obsolete = null;
if (Type.GetType("Mono.Runtime") == null)
{
// DotNet is much saner!
playload_oid = spc[0][0];
obsolete = spc[0][1][0];
oid = spc[1][0][0];
digest = spc[1][1];
}
else
{
playload_oid = spc[0];
obsolete = spc[1][0];
oid = spc[2][0][0];
digest = spc[2][1];
}
string algo = ASN1Convert.ToOid(oid);
string algoname = (new Oid(algo)).FriendlyName;
Console.WriteLine("Digest Algorithm: {0}", algoname);
byte[] Value = digest.Value;
StringBuilder hexLine_sig = new StringBuilder();
for (int i = 0; i < Value.Length; i++)
{
hexLine_sig.AppendFormat("{0} ", Value [i].ToString("X2"));
}
hexLine_sig.AppendFormat(Environment.NewLine);
switch (algoname)
{
case "md5":
hash = HashAlgorithm.Create("MD5");
break;
case "sha1":
hash = HashAlgorithm.Create("SHA1");
break;
default:
throw new NotImplementedException("Unknown HashAlgorithm: " + algoname);
}
byte[] cdigest;
if (f.IsCollection())
{
cdigest = get_TTC_digest(f);
}
else
{
cdigest = get_TTF_digest(f);
}
StringBuilder hexLine = new StringBuilder();
for (int i = 0; i < cdigest.Length; i++)
{
hexLine.AppendFormat("{0} ", cdigest [i].ToString("X2"));
}
hexLine.AppendFormat(Environment.NewLine);
Console.WriteLine("{0} Signed Digest:\t{1}", algoname.ToUpper(), hexLine_sig);
Console.WriteLine("Calculated Digest:\t{0}", hexLine);
string root_thumb = "";
#if HAVE_MONO_X509
root_thumb =
(new System.Security.Cryptography.X509Certificates.X509Certificate2(parent.RawData)).Thumbprint;
Console.WriteLine("ChainEnd Name: {0}", parent.SubjectName);
Console.WriteLine("ChainEnd Self-Signed: {0}", parent.IsSelfSigned);
#endif
Console.WriteLine("ChainEnd: {0}", root_thumb);
bool trusted = false;
try
{
string root_id = trusted_roots[root_thumb];
Console.WriteLine("RootID: {0}", root_id);
trusted = true;
}
catch (KeyNotFoundException)
{}
Console.WriteLine("Trusted: {0}", trusted);
}
return(0);
}
