cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add a link from ecrecover to address

Browse Source
This commit is contained in:
Leonardo Alt 2018-09-18 11:06:33 +02:00
parent 2409986cf3
commit d51cb16ed0
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
docs/units-and-global-variables.rst
View File

@ -151,6 +151,11 @@ Mathematical and Cryptographic Functions
recover the address associated with the public key from elliptic curve signature or return zero on error recover the address associated with the public key from elliptic curve signature or return zero on error
(`example usage <https://ethereum.stackexchange.com/q/1777/222>`_) (`example usage <https://ethereum.stackexchange.com/q/1777/222>`_)
.. note::
Function ``ecrecover`` returns an ``address``, and not an ``address
payable``. See :ref:`address payable<address>` for conversion, in case you need
to transfer funds to the recovered address.
It might be that you run into Out-of-Gas for ``sha256``, ``ripemd160`` or ``ecrecover`` on a *private blockchain*. The reason for this is that those are implemented as so-called precompiled contracts and these contracts only really exist after they received the first message (although their contract code is hardcoded). Messages to non-existing contracts are more expensive and thus the execution runs into an Out-of-Gas error. A workaround for this problem is to first send e.g. 1 Wei to each of the contracts before you use them in your actual contracts. This is not an issue on the official or test net. It might be that you run into Out-of-Gas for ``sha256``, ``ripemd160`` or ``ecrecover`` on a *private blockchain*. The reason for this is that those are implemented as so-called precompiled contracts and these contracts only really exist after they received the first message (although their contract code is hardcoded). Messages to non-existing contracts are more expensive and thus the execution runs into an Out-of-Gas error. A workaround for this problem is to first send e.g. 1 Wei to each of the contracts before you use them in your actual contracts. This is not an issue on the official or test net.
.. index:: balance, send, transfer, call, callcode, delegatecall, staticcall .. index:: balance, send, transfer, call, callcode, delegatecall, staticcall