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Make addmod and mulmod revert if the last argument is zero.

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chriseth
2018-02-15 13:52:17 +01:00
parent 5746e2d7d8
commit 2b5a5a8669
5 changed files with 37 additions and 5 deletions
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docs/miscellaneous.rst
+2 -2
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@@ -327,8 +327,8 @@ Global Variables
- ``sha256(...) returns (bytes32)``: compute the SHA-256 hash of the :ref:`(tightly packed) arguments <abi_packed_mode>`
- ``ripemd160(...) returns (bytes20)``: compute the RIPEMD-160 hash of the :ref:`(tightly packed) arguments <abi_packed_mode>`
- ``ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address)``: recover address associated with the public key from elliptic curve signature, return zero on error
- ``addmod(uint x, uint y, uint k) returns (uint)``: compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``
- ``mulmod(uint x, uint y, uint k) returns (uint)``: compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``
- ``addmod(uint x, uint y, uint k) returns (uint)``: compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``. Assert that ``k != 0`` starting from version 0.5.0.
- ``mulmod(uint x, uint y, uint k) returns (uint)``: compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``. Assert that ``k != 0`` starting from version 0.5.0.
- ``this`` (current contract's type): the current contract, explicitly convertible to ``address``
- ``super``: the contract one level higher in the inheritance hierarchy
- ``selfdestruct(address recipient)``: destroy the current contract, sending its funds to the given address
docs/units-and-global-variables.rst
+2 -2
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@@ -107,9 +107,9 @@ Mathematical and Cryptographic Functions
----------------------------------------
``addmod(uint x, uint y, uint k) returns (uint)``:
compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``.
compute ``(x + y) % k`` where the addition is performed with arbitrary precision and does not wrap around at ``2**256``. Assert that ``k != 0`` starting from version 0.5.0.
``mulmod(uint x, uint y, uint k) returns (uint)``:
compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``.
compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``. Assert that ``k != 0`` starting from version 0.5.0.
``keccak256(...) returns (bytes32)``:
compute the Ethereum-SHA-3 (Keccak-256) hash of the :ref:`(tightly packed) arguments <abi_packed_mode>`
``sha256(...) returns (bytes32)``: