/// <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>
/// 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));
}
byte[] CreatePublicKey()
{
var halg = hashAlg == 0 ? AssemblyHashAlgorithm.SHA1 : hashAlg;
return(StrongNamePublicKey.CreatePublicKey(SignatureAlgorithm.CALG_RSA_SIGN, halg, modulus, publicExponent));
}