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sign_test_utils.go
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/
sign_test_utils.go
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package crypto
import (
"fmt"
mrand "math/rand"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/onflow/flow-go/crypto/hash"
)
// tests sign and verify are consistent for multiple generated keys and messages
func testGenSignVerify(t *testing.T, salg SigningAlgorithm, halg hash.Hasher) {
t.Logf("Testing Generation/Signature/Verification for %s", salg)
// make sure the length is larger than minimum lengths of all the signaure algos
seedMinLength := 48
seed := make([]byte, seedMinLength)
input := make([]byte, 100)
r := time.Now().UnixNano()
mrand.Seed(r)
t.Logf("math rand seed is %d", r)
loops := 50
for j := 0; j < loops; j++ {
n, err := mrand.Read(seed)
require.Equal(t, n, seedMinLength)
require.NoError(t, err)
sk, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
_, err = mrand.Read(input)
require.NoError(t, err)
s, err := sk.Sign(input, halg)
require.NoError(t, err)
pk := sk.PublicKey()
// test a valid signature
result, err := pk.Verify(s, input, halg)
require.NoError(t, err)
assert.True(t, result, fmt.Sprintf(
"Verification should succeed:\n signature:%s\n message:%x\n private key:%s", s, input, sk))
// test with a different message
input[0] ^= 1
result, err = pk.Verify(s, input, halg)
require.NoError(t, err)
assert.False(t, result, fmt.Sprintf(
"Verification should fail:\n signature:%s\n message:%x\n private key:%s", s, input, sk))
input[0] ^= 1
// test with a valid but different key
seed[0] ^= 1
wrongSk, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
result, err = wrongSk.PublicKey().Verify(s, input, halg)
require.NoError(t, err)
assert.False(t, result, fmt.Sprintf(
"Verification should fail:\n signature:%s\n message:%x\n private key:%s", s, input, sk))
// test a wrong signature length
invalidLen := mrand.Intn(2 * len(s)) // try random invalid lengths
if invalidLen == len(s) { // map to an invalid length
invalidLen = 0
}
invalidSig := make([]byte, invalidLen)
result, err = pk.Verify(invalidSig, input, halg)
require.NoError(t, err)
assert.False(t, result, fmt.Sprintf(
"Verification should fail:\n signature:%s\n with invalid length %d", invalidSig, invalidLen))
}
}
var expectedError = newInvalidInputsError("")
func testKeyGenSeed(t *testing.T, salg SigningAlgorithm, minLen int, maxLen int) {
// valid seed lengths
seed := make([]byte, minLen)
_, err := GeneratePrivateKey(salg, seed)
assert.NoError(t, err)
seed = make([]byte, maxLen)
_, err = GeneratePrivateKey(salg, seed)
assert.NoError(t, err)
// invalid seed lengths
seed = make([]byte, minLen-1)
_, err = GeneratePrivateKey(salg, seed)
assert.Error(t, err)
assert.IsType(t, expectedError, err)
seed = make([]byte, maxLen+1)
_, err = GeneratePrivateKey(salg, seed)
assert.Error(t, err)
assert.IsType(t, expectedError, err)
}
func testEncodeDecode(t *testing.T, salg SigningAlgorithm) {
t.Logf("Testing encode/decode for %s", salg)
r := time.Now().UnixNano()
mrand.Seed(r)
t.Logf("math rand seed is %d", r)
// make sure the length is larger than minimum lengths of all the signaure algos
seedMinLength := 48
loops := 50
for j := 0; j < loops; j++ {
// generate a private key
seed := make([]byte, seedMinLength)
read, err := mrand.Read(seed)
require.Equal(t, read, seedMinLength)
require.NoError(t, err)
sk, err := GeneratePrivateKey(salg, seed)
assert.Nil(t, err, "the key generation has failed")
seed[0] ^= 1 // alter the seed to get a new private key
distinctSk, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
// check private key encoding
skBytes := sk.Encode()
skCheck, err := DecodePrivateKey(salg, skBytes)
require.Nil(t, err, "the key decoding has failed")
assert.True(t, sk.Equals(skCheck), "key equality check failed")
skCheckBytes := skCheck.Encode()
assert.Equal(t, skBytes, skCheckBytes, "keys should be equal")
distinctSkBytes := distinctSk.Encode()
assert.NotEqual(t, skBytes, distinctSkBytes, "keys should be different")
// check public key encoding
pk := sk.PublicKey()
pkBytes := pk.Encode()
pkCheck, err := DecodePublicKey(salg, pkBytes)
require.Nil(t, err, "the key decoding has failed")
assert.True(t, pk.Equals(pkCheck), "key equality check failed")
pkCheckBytes := pkCheck.Encode()
assert.Equal(t, pkBytes, pkCheckBytes, "keys should be equal")
distinctPkBytes := distinctSk.PublicKey().Encode()
assert.NotEqual(t, pkBytes, distinctPkBytes, "keys should be different")
// same for the compressed encoding
pkComprBytes := pk.EncodeCompressed()
pkComprCheck, err := DecodePublicKeyCompressed(salg, pkComprBytes)
require.Nil(t, err, "the key decoding has failed")
assert.True(t, pk.Equals(pkComprCheck), "key equality check failed")
pkCheckComprBytes := pkComprCheck.EncodeCompressed()
assert.Equal(t, pkComprBytes, pkCheckComprBytes, "keys should be equal")
distinctPkComprBytes := distinctSk.PublicKey().EncodeCompressed()
assert.NotEqual(t, pkComprBytes, distinctPkComprBytes, "keys should be different")
}
// test invalid private keys (equal to the curve group order)
groupOrder := make(map[SigningAlgorithm][]byte)
groupOrder[ECDSAP256] = []byte{255, 255, 255, 255, 0, 0, 0, 0, 255, 255, 255,
255, 255, 255, 255, 255, 188, 230, 250, 173, 167,
23, 158, 132, 243, 185, 202, 194, 252, 99, 37, 81}
groupOrder[ECDSASecp256k1] = []byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 254, 186, 174, 220, 230,
175, 72, 160, 59, 191, 210, 94, 140, 208, 54, 65, 65}
groupOrder[BLSBLS12381] = []byte{0x73, 0xED, 0xA7, 0x53, 0x29, 0x9D, 0x7D, 0x48, 0x33, 0x39,
0xD8, 0x08, 0x09, 0xA1, 0xD8, 0x05, 0x53, 0xBD, 0xA4, 0x02, 0xFF, 0xFE,
0x5B, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01}
_, err := DecodePrivateKey(salg, groupOrder[salg])
require.Error(t, err, "the key decoding should fail - private key value is too large")
assert.IsType(t, newInvalidInputsError(""), err)
}
func testEquals(t *testing.T, salg SigningAlgorithm, otherSigAlgo SigningAlgorithm) {
t.Logf("Testing Equals for %s", salg)
r := time.Now().UnixNano()
mrand.Seed(r)
t.Logf("math rand seed is %d", r)
// make sure the length is larger than minimum lengths of all the signaure algos
seedMinLength := 48
// generate a key pair
seed := make([]byte, seedMinLength)
n, err := mrand.Read(seed)
require.Equal(t, n, seedMinLength)
require.NoError(t, err)
// first pair
sk1, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
pk1 := sk1.PublicKey()
// second pair without changing the seed
sk2, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
pk2 := sk2.PublicKey()
// unrelated algo pair
sk3, err := GeneratePrivateKey(otherSigAlgo, seed)
require.NoError(t, err)
pk3 := sk3.PublicKey()
// fourth pair with same algo but a different seed
seed[0] ^= 1
sk4, err := GeneratePrivateKey(salg, seed)
require.NoError(t, err)
pk4 := sk4.PublicKey()
// tests
assert.True(t, sk1.Equals(sk2), "key equality should return true")
assert.True(t, pk1.Equals(pk2), "key equality should return true")
assert.False(t, sk1.Equals(sk3), "key equality should return false")
assert.False(t, pk1.Equals(pk3), "key equality should return false")
assert.False(t, sk1.Equals(sk4), "key equality should return false")
assert.False(t, pk1.Equals(pk4), "key equality should return false")
}
func testKeysAlgorithm(t *testing.T, sk PrivateKey, salg SigningAlgorithm) {
t.Logf("Testing key.Algorithm for %s", salg)
alg := sk.Algorithm()
assert.Equal(t, alg, salg)
alg = sk.PublicKey().Algorithm()
assert.Equal(t, alg, salg)
}
func testKeySize(t *testing.T, sk PrivateKey, skLen int, pkLen int) {
t.Logf("Testing key.Size for %s", sk.Algorithm())
size := sk.Size()
assert.Equal(t, size, skLen)
size = sk.PublicKey().Size()
assert.Equal(t, size, pkLen)
}
func benchVerify(b *testing.B, algo SigningAlgorithm, halg hash.Hasher) {
seed := make([]byte, 48)
for j := 0; j < len(seed); j++ {
seed[j] = byte(j)
}
sk, _ := GeneratePrivateKey(algo, seed)
pk := sk.PublicKey()
input := []byte("Bench input")
s, _ := sk.Sign(input, halg)
b.ResetTimer()
for i := 0; i < b.N; i++ {
pk.Verify(s, input, halg)
}
b.StopTimer()
}
func benchSign(b *testing.B, algo SigningAlgorithm, halg hash.Hasher) {
seed := make([]byte, 48)
for j := 0; j < len(seed); j++ {
seed[j] = byte(j)
}
sk, _ := GeneratePrivateKey(algo, seed)
input := []byte("Bench input")
b.ResetTimer()
for i := 0; i < b.N; i++ {
sk.Sign(input, halg)
}
b.StopTimer()
}