diff --git a/letsencrypt/acme/jose.py b/letsencrypt/acme/jose.py
index 3ddf9db82..da66b5b04 100644
--- a/letsencrypt/acme/jose.py
+++ b/letsencrypt/acme/jose.py
@@ -1,11 +1,11 @@
 """JOSE."""
+import base64
 import binascii
-import zope.interface
 
 import Crypto.PublicKey.RSA
+import zope.interface
 
 from letsencrypt.acme import interfaces
-from letsencrypt.client import le_util
 
 
 def _leading_zeros(arg):
@@ -43,13 +43,13 @@ class JWK(object):
     @classmethod
     def _encode_param(cls, param):
         """Encode numeric key parameter."""
-        return le_util.jose_b64encode(binascii.unhexlify(
+        return b64encode(binascii.unhexlify(
             _leading_zeros(hex(param)[2:].rstrip("L"))))
 
     @classmethod
     def _decode_param(cls, param):
         """Decode numeric key parameter."""
-        return long(binascii.hexlify(le_util.jose_b64decode(param)), 16)
+        return long(binascii.hexlify(b64decode(param)), 16)
 
     def to_json(self):
         """Serialize to JSON."""
@@ -66,3 +66,54 @@ class JWK(object):
         return cls(Crypto.PublicKey.RSA.construct(
             (cls._decode_param(json_object["n"]),
              cls._decode_param(json_object["e"]))))
+
+
+# https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-37#appendix-C
+#
+# Jose Base64:
+#
+#   - URL-safe Base64
+#
+#   - padding stripped
+
+
+def b64encode(data):
+    """JOSE Base64 encode.
+
+    :param data: Data to be encoded.
+    :type data: str or bytearray
+
+    :returns: JOSE Base64 string.
+    :rtype: str
+
+    :raises TypeError: if `data` is of incorrect type
+
+    """
+    if not isinstance(data, str):
+        raise TypeError('argument should be str or bytearray')
+    return base64.urlsafe_b64encode(data).rstrip('=')
+
+
+def b64decode(data):
+    """JOSE Base64 decode.
+
+    :param data: Base64 string to be decoded. If it's unicode, then
+                 only ASCII characters are allowed.
+    :type data: str or unicode
+
+    :returns: Decoded data.
+
+    :raises TypeError: if input is of incorrect type
+    :raises ValueError: if input is unicode with non-ASCII characters
+
+    """
+    if isinstance(data, unicode):
+        try:
+            data = data.encode('ascii')
+        except UnicodeEncodeError:
+            raise ValueError(
+                'unicode argument should contain only ASCII characters')
+    elif not isinstance(data, str):
+        raise TypeError('argument should be a str or unicode')
+
+    return base64.urlsafe_b64decode(data + '=' * (4 - (len(data) % 4)))
diff --git a/letsencrypt/acme/jose_test.py b/letsencrypt/acme/jose_test.py
index f7d9f5bcd..a18ad8700 100644
--- a/letsencrypt/acme/jose_test.py
+++ b/letsencrypt/acme/jose_test.py
@@ -57,5 +57,71 @@ class JWKTest(unittest.TestCase):
             JWK.from_json(self.jwk256json)))
 
 
+# https://en.wikipedia.org/wiki/Base64#Examples
+B64_PADDING_EXAMPLES = {
+    'any carnal pleasure.': ('YW55IGNhcm5hbCBwbGVhc3VyZS4', '='),
+    'any carnal pleasure': ('YW55IGNhcm5hbCBwbGVhc3VyZQ', '=='),
+    'any carnal pleasur': ('YW55IGNhcm5hbCBwbGVhc3Vy', ''),
+    'any carnal pleasu': ('YW55IGNhcm5hbCBwbGVhc3U', '='),
+    'any carnal pleas': ('YW55IGNhcm5hbCBwbGVhcw', '=='),
+}
+
+
+B64_URL_UNSAFE_EXAMPLES = {
+    chr(251) + chr(239): '--8',
+    chr(255) * 2: '__8',
+}
+
+
+class B64EncodeTest(unittest.TestCase):
+    """Tests for letsencrypt.acme.jose.b64encode."""
+
+    @classmethod
+    def _call(cls, data):
+        from letsencrypt.acme.jose import b64encode
+        return b64encode(data)
+
+    def test_unsafe_url(self):
+        for text, b64 in B64_URL_UNSAFE_EXAMPLES.iteritems():
+            self.assertEqual(self._call(text), b64)
+
+    def test_different_paddings(self):
+        for text, (b64, _) in B64_PADDING_EXAMPLES.iteritems():
+            self.assertEqual(self._call(text), b64)
+
+    def test_unicode_fails_with_type_error(self):
+        self.assertRaises(TypeError, self._call, u'some unicode')
+
+
+class B64DecodeTest(unittest.TestCase):
+    """Tests for letsencrypt.acme.jose.b64decode."""
+
+    @classmethod
+    def _call(cls, data):
+        from letsencrypt.acme.jose import b64decode
+        return b64decode(data)
+
+    def test_unsafe_url(self):
+        for text, b64 in B64_URL_UNSAFE_EXAMPLES.iteritems():
+            self.assertEqual(self._call(b64), text)
+
+    def test_input_without_padding(self):
+        for text, (b64, _) in B64_PADDING_EXAMPLES.iteritems():
+            self.assertEqual(self._call(b64), text)
+
+    def test_input_with_padding(self):
+        for text, (b64, pad) in B64_PADDING_EXAMPLES.iteritems():
+            self.assertEqual(self._call(b64 + pad), text)
+
+    def test_unicode_with_ascii(self):
+        self.assertEqual(self._call(u'YQ'), 'a')
+
+    def test_non_ascii_unicode_fails(self):
+        self.assertRaises(ValueError, self._call, u'\u0105')
+
+    def test_type_error_no_unicode_or_str(self):
+        self.assertRaises(TypeError, self._call, object())
+
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/letsencrypt/acme/messages.py b/letsencrypt/acme/messages.py
index 771a46911..688376ff1 100644
--- a/letsencrypt/acme/messages.py
+++ b/letsencrypt/acme/messages.py
@@ -12,8 +12,6 @@ from letsencrypt.acme import jose
 from letsencrypt.acme import other
 from letsencrypt.acme import util
 
-from letsencrypt.client import le_util
-
 
 SCHEMATA = dict([
     (schema, json.load(open(pkg_resources.resource_filename(
@@ -186,7 +184,7 @@ class Challenge(Message):
     def _fields_to_json(self):
         fields = {
             "sessionID": self.session_id,
-            "nonce": le_util.jose_b64encode(self.nonce),
+            "nonce": jose.b64encode(self.nonce),
             "challenges": self.challenges,
         }
         if self.combinations:
@@ -196,7 +194,7 @@ class Challenge(Message):
     @classmethod
     def _valid_from_json(cls, json_object):
         return cls(json_object["sessionID"],
-                   le_util.jose_b64decode(json_object["nonce"]),
+                   jose.b64decode(json_object["nonce"]),
                    json_object["challenges"], json_object.get("combinations"))
 
 
@@ -339,7 +337,7 @@ class Certificate(Message):
 
     def _fields_to_json(self):
         fields = {
-            "certificate": le_util.jose_b64encode(self.certificate.as_der())}
+            "certificate": jose.b64encode(self.certificate.as_der())}
         if self.chain is not None:
             fields["chain"] = self.chain
         if self.refresh is not None:
@@ -349,7 +347,7 @@ class Certificate(Message):
     @classmethod
     def _valid_from_json(cls, json_object):
         certificate = M2Crypto.X509.load_cert_der_string(
-            le_util.jose_b64decode(json_object["certificate"]))
+            jose.b64decode(json_object["certificate"]))
         return cls(certificate,
                    json_object.get("chain"),
                    json_object.get("refresh"))
@@ -398,13 +396,13 @@ class CertificateRequest(Message):
 
     def _fields_to_json(self):
         return {
-            "csr": le_util.jose_b64encode(self.csr),
+            "csr": jose.b64encode(self.csr),
             "signature": self.signature,
         }
 
     @classmethod
     def _valid_from_json(cls, json_object):
-        return cls(le_util.jose_b64decode(json_object["csr"]),
+        return cls(jose.b64decode(json_object["csr"]),
                    other.Signature.from_json(json_object["signature"]))
 
 
@@ -524,13 +522,13 @@ class RevocationRequest(Message):
 
     def _fields_to_json(self):
         return {
-            "certificate": le_util.jose_b64encode(self.certificate),
+            "certificate": jose.b64encode(self.certificate),
             "signature": self.signature,
         }
 
     @classmethod
     def _valid_from_json(cls, json_string):
-        return cls(le_util.jose_b64decode(json_string["certificate"]),
+        return cls(jose.b64decode(json_string["certificate"]),
                    other.Signature.from_json(json_string["signature"]))
 
 
diff --git a/letsencrypt/acme/other.py b/letsencrypt/acme/other.py
index faf48feec..63955ae2f 100644
--- a/letsencrypt/acme/other.py
+++ b/letsencrypt/acme/other.py
@@ -11,7 +11,6 @@ from letsencrypt.acme import interfaces
 from letsencrypt.acme import jose
 
 from letsencrypt.client import CONFIG
-from letsencrypt.client import le_util
 
 
 class Signature(object):
@@ -88,15 +87,14 @@ class Signature(object):
         """Seriliaze to JSON."""
         return {
             "alg": self.alg,
-            "sig": le_util.jose_b64encode(self.sig),
-            "nonce": le_util.jose_b64encode(self.nonce),
+            "sig": jose.b64encode(self.sig),
+            "nonce": jose.b64encode(self.nonce),
             "jwk": self.jwk,
         }
 
     @classmethod
     def from_json(cls, json_object):
         """Deserialize from JSON."""
-        return cls(json_object["alg"],
-                   le_util.jose_b64decode(json_object["sig"]),
-                   le_util.jose_b64decode(json_object["nonce"]),
+        return cls(json_object["alg"], jose.b64decode(json_object["sig"]),
+                   jose.b64decode(json_object["nonce"]),
                    jose.JWK.from_json(json_object["jwk"]))
diff --git a/letsencrypt/client/challenge_util.py b/letsencrypt/client/challenge_util.py
index b5d1cf38d..4c37cfee2 100644
--- a/letsencrypt/client/challenge_util.py
+++ b/letsencrypt/client/challenge_util.py
@@ -4,9 +4,10 @@ import hashlib
 
 from Crypto import Random
 
+from letsencrypt.acme import jose
+
 from letsencrypt.client import CONFIG
 from letsencrypt.client import crypto_util
-from letsencrypt.client import le_util
 
 
 # Authenticator Challenges
@@ -45,7 +46,7 @@ def dvsni_gen_cert(name, r_b64, nonce, key):
     """
     # Generate S
     dvsni_s = Random.get_random_bytes(CONFIG.S_SIZE)
-    dvsni_r = le_util.jose_b64decode(r_b64)
+    dvsni_r = jose.b64decode(r_b64)
 
     # Generate extension
     ext = _dvsni_gen_ext(dvsni_r, dvsni_s)
@@ -53,7 +54,7 @@ def dvsni_gen_cert(name, r_b64, nonce, key):
     cert_pem = crypto_util.make_ss_cert(
         key.pem, [nonce + CONFIG.INVALID_EXT, name, ext])
 
-    return cert_pem, le_util.jose_b64encode(dvsni_s)
+    return cert_pem, jose.b64encode(dvsni_s)
 
 
 def _dvsni_gen_ext(dvsni_r, dvsni_s):
diff --git a/letsencrypt/client/crypto_util.py b/letsencrypt/client/crypto_util.py
index 662e5e912..7dc8cee52 100644
--- a/letsencrypt/client/crypto_util.py
+++ b/letsencrypt/client/crypto_util.py
@@ -7,7 +7,7 @@ import Crypto.Signature.PKCS1_v1_5
 
 import M2Crypto
 
-from letsencrypt.client import le_util
+from letsencrypt.acme import jose
 
 
 def make_csr(key_str, domains):
@@ -196,4 +196,4 @@ def get_cert_info(filename):
 def b64_cert_to_pem(b64_der_cert):
     """Convert JOSE Base-64 encoded DER cert to PEM."""
     return M2Crypto.X509.load_cert_der_string(
-        le_util.jose_b64decode(b64_der_cert)).as_pem()
+        jose.b64decode(b64_der_cert)).as_pem()
diff --git a/letsencrypt/client/le_util.py b/letsencrypt/client/le_util.py
index 59b581a45..4337c91c9 100644
--- a/letsencrypt/client/le_util.py
+++ b/letsencrypt/client/le_util.py
@@ -1,5 +1,4 @@
 """Utilities for all Let's Encrypt."""
-import base64
 import errno
 import os
 import stat
@@ -68,54 +67,3 @@ def unique_file(path, mode=0o777):
         except OSError:
             pass
         count += 1
-
-
-# https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-37#appendix-C
-#
-# Jose Base64:
-#
-#   - URL-safe Base64
-#
-#   - padding stripped
-
-
-def jose_b64encode(data):
-    """JOSE Base64 encode.
-
-    :param data: Data to be encoded.
-    :type data: str or bytearray
-
-    :returns: JOSE Base64 string.
-    :rtype: str
-
-    :raises TypeError: if `data` is of incorrect type
-
-    """
-    if not isinstance(data, str):
-        raise TypeError('argument should be str or bytearray')
-    return base64.urlsafe_b64encode(data).rstrip('=')
-
-
-def jose_b64decode(data):
-    """JOSE Base64 decode.
-
-    :param data: Base64 string to be decoded. If it's unicode, then
-                 only ASCII characters are allowed.
-    :type data: str or unicode
-
-    :returns: Decoded data.
-
-    :raises TypeError: if input is of incorrect type
-    :raises ValueError: if input is unicode with non-ASCII characters
-
-    """
-    if isinstance(data, unicode):
-        try:
-            data = data.encode('ascii')
-        except UnicodeEncodeError:
-            raise ValueError(
-                'unicode argument should contain only ASCII characters')
-    elif not isinstance(data, str):
-        raise TypeError('argument should be a str or unicode')
-
-    return base64.urlsafe_b64decode(data + '=' * (4 - (len(data) % 4)))
diff --git a/letsencrypt/client/tests/challenge_util_test.py b/letsencrypt/client/tests/challenge_util_test.py
index 84a561d5d..9b051a40a 100644
--- a/letsencrypt/client/tests/challenge_util_test.py
+++ b/letsencrypt/client/tests/challenge_util_test.py
@@ -6,10 +6,11 @@ import unittest
 
 import M2Crypto
 
+from letsencrypt.acme import jose
+
 from letsencrypt.client import challenge_util
 from letsencrypt.client import client
 from letsencrypt.client import CONFIG
-from letsencrypt.client import le_util
 
 
 class DvsniGenCertTest(unittest.TestCase):
@@ -20,7 +21,7 @@ class DvsniGenCertTest(unittest.TestCase):
         """Basic test for straightline code."""
         domain = "example.com"
         dvsni_r = "r_value"
-        r_b64 = le_util.jose_b64encode(dvsni_r)
+        r_b64 = jose.b64encode(dvsni_r)
         pem = pkg_resources.resource_string(
             __name__, os.path.join("testdata", "rsa256_key.pem"))
         key = client.Client.Key("path", pem)
@@ -29,7 +30,7 @@ class DvsniGenCertTest(unittest.TestCase):
 
         # pylint: disable=protected-access
         ext = challenge_util._dvsni_gen_ext(
-            dvsni_r, le_util.jose_b64decode(s_b64))
+            dvsni_r, jose.b64decode(s_b64))
         self._standard_check_cert(cert_pem, domain, nonce, ext)
 
     def _standard_check_cert(self, pem, domain, nonce, ext):
diff --git a/letsencrypt/client/tests/le_util_test.py b/letsencrypt/client/tests/le_util_test.py
index 5cc71a1ef..6dcbf57e7 100644
--- a/letsencrypt/client/tests/le_util_test.py
+++ b/letsencrypt/client/tests/le_util_test.py
@@ -121,71 +121,5 @@ class UniqueFileTest(unittest.TestCase):
         self.assertTrue(basename3.endswith('foo.txt'))
 
 
-# https://en.wikipedia.org/wiki/Base64#Examples
-JOSE_B64_PADDING_EXAMPLES = {
-    'any carnal pleasure.': ('YW55IGNhcm5hbCBwbGVhc3VyZS4', '='),
-    'any carnal pleasure': ('YW55IGNhcm5hbCBwbGVhc3VyZQ', '=='),
-    'any carnal pleasur': ('YW55IGNhcm5hbCBwbGVhc3Vy', ''),
-    'any carnal pleasu': ('YW55IGNhcm5hbCBwbGVhc3U', '='),
-    'any carnal pleas': ('YW55IGNhcm5hbCBwbGVhcw', '=='),
-}
-
-
-B64_URL_UNSAFE_EXAMPLES = {
-    chr(251) + chr(239): '--8',
-    chr(255) * 2: '__8',
-}
-
-
-class JOSEB64EncodeTest(unittest.TestCase):
-    """Tests for letsencrypt.client.le_util.jose_b64encode."""
-
-    @classmethod
-    def _call(cls, data):
-        from letsencrypt.client.le_util import jose_b64encode
-        return jose_b64encode(data)
-
-    def test_unsafe_url(self):
-        for text, b64 in B64_URL_UNSAFE_EXAMPLES.iteritems():
-            self.assertEqual(self._call(text), b64)
-
-    def test_different_paddings(self):
-        for text, (b64, _) in JOSE_B64_PADDING_EXAMPLES.iteritems():
-            self.assertEqual(self._call(text), b64)
-
-    def test_unicode_fails_with_type_error(self):
-        self.assertRaises(TypeError, self._call, u'some unicode')
-
-
-class JOSEB64DecodeTest(unittest.TestCase):
-    """Tests for letsencrypt.client.le_util.jose_b64decode."""
-
-    @classmethod
-    def _call(cls, data):
-        from letsencrypt.client.le_util import jose_b64decode
-        return jose_b64decode(data)
-
-    def test_unsafe_url(self):
-        for text, b64 in B64_URL_UNSAFE_EXAMPLES.iteritems():
-            self.assertEqual(self._call(b64), text)
-
-    def test_input_without_padding(self):
-        for text, (b64, _) in JOSE_B64_PADDING_EXAMPLES.iteritems():
-            self.assertEqual(self._call(b64), text)
-
-    def test_input_with_padding(self):
-        for text, (b64, pad) in JOSE_B64_PADDING_EXAMPLES.iteritems():
-            self.assertEqual(self._call(b64 + pad), text)
-
-    def test_unicode_with_ascii(self):
-        self.assertEqual(self._call(u'YQ'), 'a')
-
-    def test_non_ascii_unicode_fails(self):
-        self.assertRaises(ValueError, self._call, u'\u0105')
-
-    def test_type_error_no_unicode_or_str(self):
-        self.assertRaises(TypeError, self._call, object())
-
-
 if __name__ == '__main__':
     unittest.main()