Remove unnecessary custom signature encoding

libgm/crypto/encode.go

@@ -11,22 +11,6 @@ import (
 var SequenceOne = []int{1, 2, 840, 10045, 2, 1}
 var SequenceTwo = []int{1, 2, 840, 10045, 3, 1, 7}
 
-func EncodeBNA(a []byte) []byte {
-	b := 0
-	for b < len(a) && a[b] == 0 {
-		b++
-	}
-
-	c := 0
-	if b < len(a) && (a[b]&128) == 128 {
-		c = 1
-	}
-
-	d := make([]byte, len(a)-b+c)
-	copy(d[c:], a[b:])
-	return d
-}
-
 func EncodeValues(a *[]byte, b []int) {
 	*a = append(*a, 6)
 	idx := len(*a)

libgm/crypto/signer.go

@@ -26,27 +26,5 @@ func (t *JWK) SignRequest(requestId string, timestamp int64) (string, error) {
 
 func (t *JWK) sign(key *ecdsa.PrivateKey, msg []byte) ([]byte, error) {
 	hash := sha256.Sum256(msg)
-	r, s, err := ecdsa.Sign(rand.Reader, key, hash[:])
-	if err != nil {
-		return nil, err
-	}
-
-	rBytes := r.Bytes()
-	sBytes := s.Bytes()
-
-	rBytes = EncodeBNA(rBytes)
-	sBytes = EncodeBNA(sBytes)
-
-	sigLen := len(rBytes) + len(sBytes) + 6 // 2 bytes for each sequence tag and 2 bytes for each length field
-	sig := make([]byte, sigLen)
-	sig[0] = 48
-	sig[1] = byte(sigLen - 2)
-	sig[2] = 2
-	sig[3] = byte(len(rBytes))
-	copy(sig[4:], rBytes)
-	sig[4+len(rBytes)] = 2
-	sig[5+len(rBytes)] = byte(len(sBytes))
-	copy(sig[6+len(rBytes):], sBytes)
-
-	return sig, nil
+	return ecdsa.SignASN1(rand.Reader, key, hash[:])
 }