[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc4757/keyDerivation.go b/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc4757/keyDerivation.go
new file mode 100644
index 0000000..d1f90c0
--- /dev/null
+++ b/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc4757/keyDerivation.go
@@ -0,0 +1,40 @@
+package rfc4757
+
+import (
+ "bytes"
+ "encoding/hex"
+ "errors"
+ "fmt"
+ "io"
+
+ "golang.org/x/crypto/md4"
+)
+
+// StringToKey returns a key derived from the string provided according to the definition in RFC 4757.
+func StringToKey(secret string) ([]byte, error) {
+ b := make([]byte, len(secret)*2, len(secret)*2)
+ for i, r := range secret {
+ u := fmt.Sprintf("%04x", r)
+ c, err := hex.DecodeString(u)
+ if err != nil {
+ return []byte{}, errors.New("character could not be encoded")
+ }
+ // Swap round the two bytes to make little endian as we put into byte slice
+ b[2*i] = c[1]
+ b[2*i+1] = c[0]
+ }
+ r := bytes.NewReader(b)
+ h := md4.New()
+ _, err := io.Copy(h, r)
+ if err != nil {
+ return []byte{}, err
+ }
+ return h.Sum(nil), nil
+}
+
+func deriveKeys(key, checksum []byte, usage uint32, export bool) (k1, k2, k3 []byte) {
+ k1 = key
+ k2 = HMAC(k1, UsageToMSMsgType(usage))
+ k3 = HMAC(k2, checksum)
+ return
+}