Commits on May 4, 2024

1. SmartContract: catch exception on multisignature contract parsing …

   IsMultiSigContract should return proper true/false result even if some
   garbage is provided as an input. Without this commit an exception is
   possible during IsMultiSigContract execution during subsequent public
   key decoding from compressed form:
   ```
     Failed TestIsMultiSigContract [16 ms]
     Error Message:
      Test method Neo.UnitTests.SmartContract.UT_Helper.TestIsMultiSigContract threw exception:
   System.FormatException: Invalid point encoding 221
     Stack Trace:
         at Neo.Cryptography.ECC.ECPoint.DecodePoint(ReadOnlySpan`1 encoded, ECCurve curve) in /home/anna/Documents/GitProjects/neo-project/neo/src/Neo/Cryptography/ECC/ECPoint.cs:line 98
      at Neo.SmartContract.Helper.IsMultiSigContract(ReadOnlySpan`1 script, Int32& m, Int32& n, List`1 points) in /home/anna/Documents/GitProjects/neo-project/neo/src/Neo/SmartContract/Helper.cs:line 189
      at Neo.SmartContract.Helper.IsMultiSigContract(ReadOnlySpan`1 script) in /home/anna/Documents/GitProjects/neo-project/neo/src/Neo/SmartContract/Helper.cs:line 123
      at Neo.UnitTests.SmartContract.UT_Helper.TestIsMultiSigContract() in /home/anna/Documents/GitProjects/neo-project/neo/tests/Neo.UnitTests/SmartContract/UT_Helper.cs:line 65
      at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
      at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
   ```
   
   Note that this change is compatible wrt the callers' behaviour. We need
   this change to properly handle non-Secp256r1-based witness scripts, ref.
   #3209.
   
   Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

   

   AnnaShaleva committed May 4, 2024
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