diff --git a/vendor/golang.org/x/crypto/AUTHORS b/vendor/golang.org/x/crypto/AUTHORS
deleted file mode 100644
index 2b00ddb..0000000
--- a/vendor/golang.org/x/crypto/AUTHORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code refers to The Go Authors for copyright purposes.
-# The master list of authors is in the main Go distribution,
-# visible at https://tip.golang.org/AUTHORS.
diff --git a/vendor/golang.org/x/crypto/CONTRIBUTORS b/vendor/golang.org/x/crypto/CONTRIBUTORS
deleted file mode 100644
index 1fbd3e9..0000000
--- a/vendor/golang.org/x/crypto/CONTRIBUTORS
+++ /dev/null
@@ -1,3 +0,0 @@
-# This source code was written by the Go contributors.
-# The master list of contributors is in the main Go distribution,
-# visible at https://tip.golang.org/CONTRIBUTORS.
diff --git a/vendor/golang.org/x/crypto/md4/md4.go b/vendor/golang.org/x/crypto/md4/md4.go
index 59d3480..d1911c2 100644
--- a/vendor/golang.org/x/crypto/md4/md4.go
+++ b/vendor/golang.org/x/crypto/md4/md4.go
@@ -4,7 +4,7 @@
 
 // Package md4 implements the MD4 hash algorithm as defined in RFC 1320.
 //
-// Deprecated: MD4 is cryptographically broken and should should only be used
+// Deprecated: MD4 is cryptographically broken and should only be used
 // where compatibility with legacy systems, not security, is the goal. Instead,
 // use a secure hash like SHA-256 (from crypto/sha256).
 package md4 // import "golang.org/x/crypto/md4"
diff --git a/vendor/golang.org/x/crypto/md4/md4block.go b/vendor/golang.org/x/crypto/md4/md4block.go
index 3fed475..5ea1ba9 100644
--- a/vendor/golang.org/x/crypto/md4/md4block.go
+++ b/vendor/golang.org/x/crypto/md4/md4block.go
@@ -8,9 +8,11 @@
 
 package md4
 
-var shift1 = []uint{3, 7, 11, 19}
-var shift2 = []uint{3, 5, 9, 13}
-var shift3 = []uint{3, 9, 11, 15}
+import "math/bits"
+
+var shift1 = []int{3, 7, 11, 19}
+var shift2 = []int{3, 5, 9, 13}
+var shift3 = []int{3, 9, 11, 15}
 
 var xIndex2 = []uint{0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15}
 var xIndex3 = []uint{0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15}
@@ -48,7 +50,7 @@
 			s := shift1[i%4]
 			f := ((c ^ d) & b) ^ d
 			a += f + X[x]
-			a = a<<s | a>>(32-s)
+			a = bits.RotateLeft32(a, s)
 			a, b, c, d = d, a, b, c
 		}
 
@@ -58,7 +60,7 @@
 			s := shift2[i%4]
 			g := (b & c) | (b & d) | (c & d)
 			a += g + X[x] + 0x5a827999
-			a = a<<s | a>>(32-s)
+			a = bits.RotateLeft32(a, s)
 			a, b, c, d = d, a, b, c
 		}
 
@@ -68,7 +70,7 @@
 			s := shift3[i%4]
 			h := b ^ c ^ d
 			a += h + X[x] + 0x6ed9eba1
-			a = a<<s | a>>(32-s)
+			a = bits.RotateLeft32(a, s)
 			a, b, c, d = d, a, b, c
 		}
 
diff --git a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
index 593f653..904b57e 100644
--- a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
+++ b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go
@@ -32,7 +32,7 @@
 // can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
 // doing:
 //
-// 	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
+//	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
 //
 // Remember to get a good random salt. At least 8 bytes is recommended by the
 // RFC.