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package secp256k1_test
import (
"encoding/hex"
"math/big"
"testing"
"github.com/btcsuite/btcutil/base58"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/secp256k1"
underlyingSecp256k1 "github.com/btcsuite/btcd/btcec"
)
type keyData struct {
priv string
pub string
addr string
}
var secpDataTable = []keyData{
{
priv: "a96e62ed3955e65be32703f12d87b6b5cf26039ecfa948dc5107a495418e5330",
pub: "02950e1cdfcb133d6024109fd489f734eeb4502418e538c28481f22bce276f248c",
addr: "1CKZ9Nx4zgds8tU7nJHotKSDr4a9bYJCa3",
},
}
func TestPubKeySecp256k1Address(t *testing.T) {
for _, d := range secpDataTable {
privB, _ := hex.DecodeString(d.priv)
pubB, _ := hex.DecodeString(d.pub)
addrBbz, _, _ := base58.CheckDecode(d.addr)
addrB := crypto.Address(addrBbz)
priv := secp256k1.PrivKey(privB)
pubKey := priv.PubKey()
pubT, _ := pubKey.(secp256k1.PubKey)
pub := pubT
addr := pubKey.Address()
assert.Equal(t, pub, secp256k1.PubKey(pubB), "Expected pub keys to match")
assert.Equal(t, addr, addrB, "Expected addresses to match")
}
}
func TestSignAndValidateSecp256k1(t *testing.T) {
privKey := secp256k1.GenPrivKey()
pubKey := privKey.PubKey()
msg := crypto.CRandBytes(128)
sig, err := privKey.Sign(msg)
require.Nil(t, err)
assert.True(t, pubKey.VerifySignature(msg, sig))
// Mutate the signature, just one bit.
sig[3] ^= byte(0x01)
assert.False(t, pubKey.VerifySignature(msg, sig))
}
// This test is intended to justify the removal of calls to the underlying library
// in creating the privkey.
func TestSecp256k1LoadPrivkeyAndSerializeIsIdentity(t *testing.T) {
numberOfTests := 256
for i := 0; i < numberOfTests; i++ {
// Seed the test case with some random bytes
privKeyBytes := [32]byte{}
copy(privKeyBytes[:], crypto.CRandBytes(32))
// This function creates a private and public key in the underlying libraries format.
// The private key is basically calling new(big.Int).SetBytes(pk), which removes leading zero bytes
priv, _ := underlyingSecp256k1.PrivKeyFromBytes(underlyingSecp256k1.S256(), privKeyBytes[:])
// this takes the bytes returned by `(big int).Bytes()`, and if the length is less than 32 bytes,
// pads the bytes from the left with zero bytes. Therefore these two functions composed
// result in the identity function on privKeyBytes, hence the following equality check
// always returning true.
serializedBytes := priv.Serialize()
require.Equal(t, privKeyBytes[:], serializedBytes)
}
}
func TestGenPrivKeySecp256k1(t *testing.T) {
// curve oder N
N := underlyingSecp256k1.S256().N
tests := []struct {
name string
secret []byte
}{
{"empty secret", []byte{}},
{
"some long secret",
[]byte("We live in a society exquisitely dependent on science and technology, " +
"in which hardly anyone knows anything about science and technology."),
},
{"another seed used in cosmos tests #1", []byte{0}},
{"another seed used in cosmos tests #2", []byte("mySecret")},
{"another seed used in cosmos tests #3", []byte("")},
}
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
gotPrivKey := secp256k1.GenPrivKeySecp256k1(tt.secret)
require.NotNil(t, gotPrivKey)
// interpret as a big.Int and make sure it is a valid field element:
fe := new(big.Int).SetBytes(gotPrivKey[:])
require.True(t, fe.Cmp(N) < 0)
require.True(t, fe.Sign() > 0)
})
}
}