service: implement a function for creating and storing a signature
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3 changed files with 59 additions and 0 deletions
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@ -56,3 +56,17 @@ func DataSignature(src SignedDataSource, key *ecdsa.PrivateKey) ([]byte, error)
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return crypto.Sign(key, data)
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}
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// AddSignatureWithKey calculates the data signature and adds it to accumulator with public key.
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//
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// Returns signing errors only.
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func AddSignatureWithKey(v SignatureKeyAccumulator, key *ecdsa.PrivateKey) error {
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sign, err := DataSignature(v, key)
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if err != nil {
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return err
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}
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v.AddSignKey(sign, &key.PublicKey)
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return nil
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}
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@ -1,6 +1,7 @@
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package service
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"errors"
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"io"
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@ -23,6 +24,21 @@ type testSignedDataReader struct {
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d []byte
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}
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type testKeySigAccum struct {
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d []byte
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f func([]byte, *ecdsa.PublicKey)
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}
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func (s testKeySigAccum) SignedData() ([]byte, error) {
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return s.d, nil
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}
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func (s testKeySigAccum) AddSignKey(sig []byte, key *ecdsa.PublicKey) {
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if s.f != nil {
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s.f(sig, key)
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}
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}
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func testData(t *testing.T, sz int) []byte {
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d := make([]byte, sz)
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_, err := rand.Read(d)
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@ -110,3 +126,22 @@ func TestDataSignature(t *testing.T) {
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require.NoError(t, crypto.Verify(&sk.PublicKey, src.d, sig))
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})
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}
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func TestAddSignatureWithKey(t *testing.T) {
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// create test data
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data := testData(t, 10)
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// create test private key
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sk := test.DecodeKey(0)
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// create test signature accumulator
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var s SignatureKeyAccumulator = &testKeySigAccum{
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d: data,
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f: func(sig []byte, key *ecdsa.PublicKey) {
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require.Equal(t, &sk.PublicKey, key)
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require.NoError(t, crypto.Verify(key, data, sig))
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},
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}
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require.NoError(t, AddSignatureWithKey(s, sk))
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}
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@ -1,5 +1,9 @@
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package service
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import (
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"crypto/ecdsa"
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)
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// NodeRole to identify in Bootstrap service.
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type NodeRole int32
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@ -187,3 +191,9 @@ type SignedDataReader interface {
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// Must behave like Read method of io.Reader and differ only in the reading of the signed data.
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ReadSignedData([]byte) (int, error)
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}
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// SignatureKeyAccumulator is an interface of the accumulator of data signatures with keys.
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type SignatureKeyAccumulator interface {
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SignedDataSource
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AddSignKey([]byte, *ecdsa.PublicKey)
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}
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