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Merge pull request #704 from ethereum/malleability
Expanded malleability risks.
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e10297a2ef
@ -146,7 +146,11 @@ Minor Details
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Furthermore, it is not enforced by the EVM, so a contract function that "claims"
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to be constant might still cause changes to the state.
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- Types that do not occupy the full 32 bytes might contain "dirty higher order bits".
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This is especially important if you access ``msg.data`` - it poses a malleability risk.
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This is especially important if you access ``msg.data`` - it poses a malleability risk:
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You can craft transactions that call a function ``f(uint8 x)`` with a raw byte argument
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of ``0xff000001`` and with ``0x00000001``. Both are fed to the contract and both will
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look like the number ``1`` as far as ``x`` is concerned, but ``msg.data`` will
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be different, so if you use ``sha3(msg.data)`` for anything, you will get different results.
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***************
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Recommendations
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