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Added EIP 96 blockhash getter

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vub 2017-04-26 02:36:26 -04:00
parent 40a2df918c
commit b0c163521d
1 changed files with 23 additions and 0 deletions
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# Setting the block hash
if msg.sender == 2**160 - 2:
with prev_block_number = block.number - 1:
# Use storage fields 0..255 to store the last 256 hashes
~sstore(prev_block_number % 256, ~calldataload(0))
# Use storage fields 256..511 to store the hashes of the last 256
# blocks with block.number % 256 == 0
if not prev_block_number % 256:
~sstore(256 + (prev_block_number / 256) % 256, ~calldataload(0))
# Use storage fields 512..767 to store the hashes of the last 256
# blocks with block.number % 65536 == 0
if not prev_block_number % 65536:
~sstore(512 + (prev_block_number / 65536) % 256, ~calldataload(0))
# Getting the block hash
else:
if block.number - ~calldataload(0) <= 256:
return(~sload(~calldataload(0) % 256))
elif not block.number % 256 and block.number - ~calldataload(0) <= 65536:
return(~sload(256 + (~calldataload(0) / 256) % 256))
elif not block.number % 65536 and block.number - ~calldataload(0) <= 16777216:
return(~sload(512 + (~calldataload(0) / 65536) % 256))
else:
~invalid()