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