/// <summary>
/// Creates a counter signature, just like
/// <c>sn -a IdentityPubKey.snk IdentityKey.snk SignaturePubKey.snk</c> can do.
/// The public key <c>sn</c> prints is <paramref name="signaturePubKey"/>'s value.
/// </summary>
/// <param name="identityPubKey">Identity public key</param>
/// <param name="identityKey">Identity strong name key pair</param>
/// <param name="signaturePubKey">Signature public key</param>
/// <returns>The counter signature</returns>
public static byte[] CreateCounterSignature(StrongNamePublicKey identityPubKey, StrongNameKey identityKey, StrongNamePublicKey signaturePubKey)
{
var hash = AssemblyHash.Hash(signaturePubKey.CreatePublicKey(), identityPubKey.HashAlgorithm);
using (var rsa = identityKey.CreateRSA())
{
var rsaFmt = new RSAPKCS1SignatureFormatter(rsa);
string hashName = identityPubKey.HashAlgorithm.GetName();
rsaFmt.SetHashAlgorithm(hashName);
var snSig = rsaFmt.CreateSignature(hash);
Array.Reverse(snSig);
return(snSig);
}
}
/// <summary>
/// Adds or updates an existing <c>System.Reflection.AssemblySignatureKeyAttribute</c>
/// attribute. This attribute is used in enhanced strong naming with key migration.
/// See http://msdn.microsoft.com/en-us/library/hh415055.aspx
/// </summary>
/// <param name="identityPubKey">Identity public key</param>
/// <param name="identityKey">Identity strong name key pair</param>
/// <param name="signaturePubKey">Signature public key</param>
public void UpdateOrCreateAssemblySignatureKeyAttribute(StrongNamePublicKey identityPubKey, StrongNameKey identityKey, StrongNamePublicKey signaturePubKey)
{
var manifestModule = ManifestModule;
if (manifestModule == null)
{
return;
}
// Remove all existing attributes
var ca = CustomAttributes.ExecuteLocked <CustomAttribute, object, CustomAttribute>(null, (tsList, arg) =>
{
CustomAttribute foundCa = null;
for (int i = 0; i < tsList.Count_NoLock(); i++)
{
var caTmp = tsList.Get_NoLock(i);
if (caTmp.TypeFullName != "System.Reflection.AssemblySignatureKeyAttribute")
{
continue;
}
tsList.RemoveAt_NoLock(i);
i--;
if (foundCa == null)
{
foundCa = caTmp;
}
}
return(foundCa);
});
if (IsValidAssemblySignatureKeyAttribute(ca))
{
ca.NamedArguments.Clear();
}
else
{
ca = CreateAssemblySignatureKeyAttribute();
}
var counterSig = StrongNameKey.CreateCounterSignatureAsString(identityPubKey, identityKey, signaturePubKey);
ca.ConstructorArguments[0] = new CAArgument(manifestModule.CorLibTypes.String, new UTF8String(signaturePubKey.ToString()));
ca.ConstructorArguments[1] = new CAArgument(manifestModule.CorLibTypes.String, new UTF8String(counterSig));
CustomAttributes.Add(ca);
}
/// <summary>
/// Creates a counter signature, just like
/// <c>sn -a IdentityPubKey.snk IdentityKey.snk SignaturePubKey.snk</c> can do.
/// The public key <c>sn</c> prints is <paramref name="signaturePubKey"/>'s value.
/// </summary>
/// <param name="identityPubKey">Identity public key</param>
/// <param name="identityKey">Identity strong name key pair</param>
/// <param name="signaturePubKey">Signature public key</param>
/// <returns>The counter signature as a hex string</returns>
public static string CreateCounterSignatureAsString(StrongNamePublicKey identityPubKey, StrongNameKey identityKey, StrongNamePublicKey signaturePubKey)
{
var counterSignature = CreateCounterSignature(identityPubKey, identityKey, signaturePubKey);
return(Utils.ToHex(counterSignature, false));
}
private byte[] CreatePublicKey_NoLock()
{
var halg = hashAlg == 0 ? AssemblyHashAlgorithm.SHA1 : hashAlg;
return(StrongNamePublicKey.CreatePublicKey(SignatureAlgorithm.CALG_RSA_SIGN, halg, modulus, publicExponent));
}