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Implement EIP-7883 #1226

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Implement EIP-7883 #1226

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10 changes: 7 additions & 3 deletions src/ethereum/osaka/vm/precompiled_contracts/modexp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,11 @@ def complexity(base_length: U256, modulus_length: U256) -> Uint:
"""
max_length = max(Uint(base_length), Uint(modulus_length))
words = (max_length + Uint(7)) // Uint(8)
return words ** Uint(2)
complexity = words ** Uint(2)
if max_length <= Uint(32):
return complexity
else:
return Uint(2) * complexity


def iterations(exponent_length: U256, exponent_head: Uint) -> Uint:
Expand Down Expand Up @@ -120,7 +124,7 @@ def iterations(exponent_length: U256, exponent_head: Uint) -> Uint:

count = bit_length
else:
length_part = Uint(8) * (Uint(exponent_length) - Uint(32))
length_part = Uint(16) * (Uint(exponent_length) - Uint(32))
bits_part = Uint(exponent_head.bit_length())

if bits_part > Uint(0):
Expand Down Expand Up @@ -166,4 +170,4 @@ def gas_cost(
iteration_count = iterations(exponent_length, exponent_head)
cost = multiplication_complexity * iteration_count
cost //= GQUADDIVISOR
return max(Uint(200), cost)
return max(Uint(500), cost)
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