[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc3962/keyDerivation.go b/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc3962/keyDerivation.go
new file mode 100644
index 0000000..fb402d9
--- /dev/null
+++ b/vendor/github.com/jcmturner/gokrb5/v8/crypto/rfc3962/keyDerivation.go
@@ -0,0 +1,51 @@
+package rfc3962
+
+import (
+ "encoding/binary"
+ "encoding/hex"
+ "errors"
+
+ "github.com/jcmturner/gofork/x/crypto/pbkdf2"
+ "github.com/jcmturner/gokrb5/v8/crypto/etype"
+)
+
+const (
+ s2kParamsZero = 4294967296
+)
+
+// StringToKey returns a key derived from the string provided according to the definition in RFC 3961.
+func StringToKey(secret, salt, s2kparams string, e etype.EType) ([]byte, error) {
+ i, err := S2KparamsToItertions(s2kparams)
+ if err != nil {
+ return nil, err
+ }
+ return StringToKeyIter(secret, salt, i, e)
+}
+
+// StringToPBKDF2 generates an encryption key from a pass phrase and salt string using the PBKDF2 function from PKCS #5 v2.0
+func StringToPBKDF2(secret, salt string, iterations int64, e etype.EType) []byte {
+ return pbkdf2.Key64([]byte(secret), []byte(salt), iterations, int64(e.GetKeyByteSize()), e.GetHashFunc())
+}
+
+// StringToKeyIter returns a key derived from the string provided according to the definition in RFC 3961.
+func StringToKeyIter(secret, salt string, iterations int64, e etype.EType) ([]byte, error) {
+ tkey := e.RandomToKey(StringToPBKDF2(secret, salt, iterations, e))
+ return e.DeriveKey(tkey, []byte("kerberos"))
+}
+
+// S2KparamsToItertions converts the string representation of iterations to an integer
+func S2KparamsToItertions(s2kparams string) (int64, error) {
+ //The s2kparams string should be hex string representing 4 bytes
+ //The 4 bytes represent a number in big endian order
+ //If the value is zero then the number of iterations should be 4,294,967,296 (2^32)
+ var i uint32
+ if len(s2kparams) != 8 {
+ return int64(s2kParamsZero), errors.New("invalid s2kparams length")
+ }
+ b, err := hex.DecodeString(s2kparams)
+ if err != nil {
+ return int64(s2kParamsZero), errors.New("invalid s2kparams, cannot decode string to bytes")
+ }
+ i = binary.BigEndian.Uint32(b)
+ return int64(i), nil
+}