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Chris Ward 2019-04-08 11:46:32 +02:00
parent 26d6305a43
commit 4a6d6cb14f
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docs/units-and-global-variables.rst
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@ -188,9 +188,9 @@ Mathematical and Cryptographic Functions
.. warning:: .. warning::
If you use ``ecrecover``, be aware that a valid signature can be turned into a different valid signature without requiring If you use ``ecrecover``, be aware that a valid signature can be turned into a different valid signature without
knowledge of the corresponding private key. Since `EIP-2 <http://eips.ethereum.org/EIPS/eip-2#specification>`_, all transaction signatures with an ``s`` value requiring knowledge of the corresponding private key. Since `EIP-2 <http://eips.ethereum.org/EIPS/eip-2#specification>`_,
greater than ``secp256k1n/2`` are considered invalid. all transaction signatures with an ``s`` value greater than ``secp256k1n/2`` are considered invalid.
This is usually not a problem unless you require signatures to be unique or This is usually not a problem unless you require signatures to be unique or
use them to identify items. OpenZeppelin have a `ECDSA helper library <https://docs.openzeppelin.org/docs/cryptography_ecdsa>`_ that you can use as a wrapper for ``ecrecover`` without this issue. use them to identify items. OpenZeppelin have a `ECDSA helper library <https://docs.openzeppelin.org/docs/cryptography_ecdsa>`_ that you can use as a wrapper for ``ecrecover`` without this issue.