diff options
Diffstat (limited to 'core/vm/instructions.go')
| -rw-r--r-- | core/vm/instructions.go | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/core/vm/instructions.go b/core/vm/instructions.go index 349f407a2..de0fcaeb6 100644 --- a/core/vm/instructions.go +++ b/core/vm/instructions.go @@ -17,6 +17,7 @@ package vm import ( + "encoding/binary" "errors" "fmt" "math/big" @@ -24,6 +25,7 @@ import ( "github.com/dexon-foundation/dexon/common" "github.com/dexon-foundation/dexon/common/math" "github.com/dexon-foundation/dexon/core/types" + "github.com/dexon-foundation/dexon/crypto" "github.com/dexon-foundation/dexon/params" "golang.org/x/crypto/sha3" ) @@ -404,6 +406,26 @@ func opSha3(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory return nil, nil } +func opRand(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) { + evm := interpreter.evm + + nonce := evm.StateDB.GetNonce(contract.Caller()) + binaryNonce := make([]byte, binary.MaxVarintLen64) + binary.PutUvarint(binaryNonce, nonce) + + binaryGas := make([]byte, binary.MaxVarintLen64) + binary.PutUvarint(binaryGas, contract.Gas) + + hash := crypto.Keccak256( + evm.Randomness, + contract.Caller().Bytes(), + binaryNonce, + binaryGas) + + stack.push(interpreter.intPool.get().SetBytes(hash)) + return nil, nil +} + func opAddress(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) { stack.push(contract.Address().Big()) return nil, nil |