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core: check for key length in CheckWitness, fix #968
Only one type of keys is allowed here.
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@ -322,6 +322,10 @@ func (ic *interopContext) runtimeCheckWitness(v *vm.VM) error {
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hashOrKey := v.Estack().Pop().Bytes()
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hash, err := util.Uint160DecodeBytesBE(hashOrKey)
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if err != nil {
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// We only accept compressed keys here as per C# implementation.
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if len(hashOrKey) != 33 {
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return errors.New("bad parameter length")
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}
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key := &keys.PublicKey{}
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err = key.DecodeBytes(hashOrKey)
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if err != nil {
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