yaole
27 lines
513 B
Go
27 lines
513 B
Go
package paillier
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import (
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"crypto/rand"
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"math/big"
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"testing"
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"github.com/stretchr/testify/assert"
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"xdx.jelly/xgcl/grand"
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)
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func TestNeg(t *testing.T) {
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sk, err := GenerateKeyFromPassword(2048, grand.GetRandom(32), grand.GetRandom(32), 1024)
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assert.Nil(t, err)
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pk := sk.Public()
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m, _ := rand.Int(grand.Reader, pk.N)
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mNeg := new(big.Int).Sub(pk.N, m) // n - m
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c, _ := Encrypt(m, pk, grand.Reader)
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c.Neg(pk) // Enc(n-m) = Enc(m)^-1 mod n^2
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mm, _ := Decrypt(c, sk)
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assert.Zero(t, mm.Cmp(mNeg))
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}
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