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