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keccak256 does not call an external contract

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``keccak256`` will be compiled to the ``SHA3`` opcode and not call an external contract.
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ritzdorf 2018-11-13 15:54:13 +01:00 committed by GitHub
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docs/contracts.rst
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@ -455,7 +455,7 @@ execution data (``msg.value`` or ``gasleft()``) or makes calls to external contr
that might have a side-effect on memory allocation are allowed, but those that
might have a side-effect on other memory objects are not. The built-in functions
``keccak256``, ``sha256``, ``ripemd160``, ``ecrecover``, ``addmod`` and ``mulmod``
are allowed (even though they do call external contracts).
are allowed (even though, with the exception of ``keccak256``, they do call external contracts).
The reason behind allowing side-effects on the memory allocator is that it
should be possible to construct complex objects like e.g. lookup-tables.