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internal/radix51: remove FeCSwap 

It's unused and it does not do what it says in the docs.
This commit is contained in:
Filippo Valsorda 2019-01-20 18:13:25 -05:00 committed by George Tankersley
parent 0a030f62c0
commit 0e8b4dbb24
1 changed files with 0 additions and 25 deletions
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25
internal/radix51/fe.go
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@ -192,31 +192,6 @@ func FeInvert(out, z *FieldElement) {
FeMul(out, &t, &z11) // 2^255 - 21
}
// FeCSwap implements a constant-time conditional swap. That is:
// (a, b) = (b, a) if c = 1
// (a, b) = (a, b) if c = 0
func FeCSwap(a, b *FieldElement, c uint64) {
var t FieldElement
t[0] ^= c & (a[0] ^ b[0])
t[1] ^= c & (a[1] ^ b[1])
t[2] ^= c & (a[2] ^ b[2])
t[3] ^= c & (a[3] ^ b[3])
t[4] ^= c & (a[4] ^ b[4])
a[0] ^= t[0]
a[1] ^= t[1]
a[2] ^= t[2]
a[3] ^= t[3]
a[4] ^= t[4]
b[0] ^= t[0]
b[1] ^= t[1]
b[2] ^= t[2]
b[3] ^= t[3]
b[4] ^= t[4]
}
// Returns true if two field elements are equal.
func FeEqual(a, b *FieldElement) bool {
var result uint64