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core/vm: remove shift

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This commit is contained in:
Felix Lange 2025-08-15 15:41:46 +02:00
parent ae8d4d4629
commit c8d18bf9c3
1 changed files with 8 additions and 11 deletions
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7
core/vm/contracts.go
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@ -506,6 +506,7 @@ func (c *bigModExp) Run(input []byte) ([]byte, error) {
baseLen = baseLenBig.Uint64() baseLen = baseLenBig.Uint64()
expLen = expLenBig.Uint64() expLen = expLenBig.Uint64()
modLen = modLenBig.Uint64() modLen = modLenBig.Uint64()
inputLenOverflow = max(baseLenBig.BitLen(), expLenBig.BitLen(), modLenBig.BitLen()) > 64
) )
if len(input) > 96 { if len(input) > 96 {
input = input[96:] input = input[96:]
@ -513,12 +514,8 @@ func (c *bigModExp) Run(input []byte) ([]byte, error) {
input = input[:0] input = input[:0]
} }
inputLensHighBitsSet := baseLenBig.Rsh(baseLenBig, 64).Cmp(common.Big0) != 0 ||
expLenBig.Rsh(expLenBig, 64).Cmp(common.Big0) != 0 ||
modLenBig.Rsh(modLenBig, 64).Cmp(common.Big0) != 0
// enforce size cap for inputs // enforce size cap for inputs
if c.eip7823 && (max(baseLen, expLen, modLen) > 1024 || inputLensHighBitsSet) { if c.eip7823 && (inputLenOverflow || max(baseLen, expLen, modLen) > 1024) {
return nil, errors.New("one or more of base/exponent/modulus length exceeded 1024 bytes") return nil, errors.New("one or more of base/exponent/modulus length exceeded 1024 bytes")
} }
// Handle a special case when both the base and mod length is zero // Handle a special case when both the base and mod length is zero