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package secp256k1
import (
"bytes"
"math/big"
"testing"
"github.com/stretchr/testify/require"
underlyingSecp256k1 "github.com/btcsuite/btcd/btcec"
)
func Test_genPrivKey(t *testing.T) {
empty := make([]byte, 32)
oneB := big.NewInt(1).Bytes()
onePadded := make([]byte, 32)
copy(onePadded[32-len(oneB):32], oneB)
t.Logf("one padded: %v, len=%v", onePadded, len(onePadded))
validOne := append(empty, onePadded...)
tests := []struct {
name string
notSoRand []byte
shouldPanic bool
}{
{"empty bytes (panics because 1st 32 bytes are zero and 0 is not a valid field element)", empty, true},
{"curve order: N", underlyingSecp256k1.S256().N.Bytes(), true},
{"valid because 0 < 1 < N", validOne, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if tt.shouldPanic {
require.Panics(t, func() {
genPrivKey(bytes.NewReader(tt.notSoRand))
})
return
}
got := genPrivKey(bytes.NewReader(tt.notSoRand))
fe := new(big.Int).SetBytes(got[:])
require.True(t, fe.Cmp(underlyingSecp256k1.S256().N) < 0)
require.True(t, fe.Sign() > 0)
})
}
}