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internal/bigmod: optimize SetOverflowedBytes #273

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Sun Yimin 2024-11-20 18:15:32 +08:00 committed by GitHub
parent 9624b43515
commit 4f7504c6b9
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1 changed files with 3 additions and 2 deletions
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internal/bigmod/nat.go
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@ -196,8 +196,9 @@ func (x *Nat) SetOverflowedBytes(b []byte, m *Modulus) *Nat {
one := NewNat().resetFor(m)
one.limbs[0] = 1
x.resetToBytes(b)
x = NewNat().modNat(x, mMinusOne)
return x.Add(one, m)
x = NewNat().modNat(x, mMinusOne) // x = x mod (m-1)
x.add(one) // we can safely add 1, no need to check overflow
return x
}
// bigEndianUint returns the contents of buf interpreted as a