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add ordk0 generation test

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This commit is contained in:
Emman 2021-12-22 16:59:43 +08:00
parent 73e8e0f0e5
commit a59e3e2e87
1 changed files with 12 additions and 0 deletions
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12
sm2/p256_asm_test.go
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@ -17,6 +17,18 @@ func toBigInt(in []uint64) *big.Int {
return new(big.Int).SetBytes(valBytes)
}
// ordk0 = -n^(-1) mod 2^64
func Test_p256ordk0(t *testing.T) {
n, _ := new(big.Int).SetString("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", 16)
p, _ := new(big.Int).SetString("10000000000000000", 16) // 2^64
n = n.ModInverse(n, p)
n = n.Neg(n)
n = n.Mod(n, p)
if "327f9e8872350975" != hex.EncodeToString(n.Bytes()) {
t.Failed()
}
}
func Test_p256NegCond(t *testing.T) {
p, _ := new(big.Int).SetString("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", 16)
var val = []uint64{0x61328990f418029e, 0x3e7981eddca6c050, 0xd6a1ed99ac24c3c3, 0x91167a5ee1c13b05}