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// Copyright © 2021 siddharth ravikumar <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package lib
import (
"math/big"
"testing"
)
func TestInvMod(t *testing.T) {
a := big.NewInt(17)
b := big.NewInt(3120)
e := big.NewInt(2753) // Expected inverse.
i, err := invmod(a, b)
if err != nil {
t.Errorf("invmod(%v,%v) failed: %v", a, b, err)
return
}
if i.Cmp(e) != 0 {
t.Errorf("gcd(%v,%v) != %v", a, b, e)
}
a = big.NewInt(240)
b = big.NewInt(47)
e = big.NewInt(19) // Expected inverse.
i, err = invmod(a, b)
if err != nil {
t.Errorf("invmod(%v,%v) failed: %v", a, b, err)
return
}
if i.Cmp(e) != 0 {
t.Errorf("gcd(%v,%v) != %v", a, b, e)
}
a = big.NewInt(11)
b = big.NewInt(26)
e = big.NewInt(19) // Expected inverse.
i, err = invmod(a, b)
if err != nil {
t.Errorf("invmod(%v,%v) failed: %v", a, b, err)
return
}
if i.Cmp(e) != 0 {
t.Errorf("gcd(%v,%v) != %v", a, b, e)
}
a = big.NewInt(3)
b = big.NewInt(7)
e = big.NewInt(5) // Expected inverse.
i, err = invmod(a, b)
if err != nil {
t.Errorf("invmod(%v,%v) failed: %v", a, b, err)
return
}
if i.Cmp(e) != 0 {
t.Errorf("gcd(%v,%v) != %v", a, b, e)
}
}
func TestRSAGenKey(t *testing.T) {
pair, err := RSAGenKey()
if err != nil {
t.Errorf("genkey: %v", err)
return
}
if pair.Public == nil {
t.Error("genkey: pub key is nil")
return
}
if pair.Public.e.Cmp(big.NewInt(0)) < 1 {
t.Error("genkey: e is invalid")
return
}
if pair.Public.n.Cmp(big.NewInt(0)) < 1 {
t.Error("genkey: n is invalid")
return
}
if pair.Private == nil {
t.Error("genkey: private key is nil")
return
}
if pair.Private.d.Cmp(big.NewInt(0)) < 1 {
t.Error("genkey: d is invalid")
return
}
if pair.Private.n.Cmp(big.NewInt(0)) < 1 {
t.Error("genkey: n is invalid")
return
}
if pair.Public.n.Cmp(pair.Private.n) != 0 {
t.Error("genkey: public.n != private.n")
return
}
}
func TestRSAEncryptDecrypt(t *testing.T) {
pair, err := RSAGenKey()
if err != nil {
t.Errorf("genkey: %v", err)
return
}
pub := pair.Public
prv := pair.Private
// [1] Encrypt.
msg := []byte("42")
enc := pub.Encrypt(msg)
if len(enc) < 1 {
t.Errorf("encrypt failed: %v", enc)
return
}
// [1] Decrypt.
dec := prv.Decrypt(enc)
if !BytesEqual(msg, dec) {
t.Errorf("decrypt failed: %v", dec)
return
}
// [2] Encrypt.
msg = []byte("0xd1a4a6e870b40a261827f17741c19facf80d01a537d55e59abe5d615d961a23f")
enc = pub.Encrypt(msg)
if len(enc) < 1 {
t.Errorf("encrypt failed: %v", enc)
return
}
// [2] Decrypt.
dec = prv.Decrypt(enc)
if !BytesEqual(msg, dec) {
t.Errorf("decrypt failed: %v", dec)
return
}
}
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