diff --git a/trezor_agent/gpg/encode.py b/trezor_agent/gpg/encode.py
index b43294b..1621223 100644
--- a/trezor_agent/gpg/encode.py
+++ b/trezor_agent/gpg/encode.py
@@ -1,5 +1,4 @@
 """Create GPG ECDSA signatures and public keys using TREZOR device."""
-import base64
 import hashlib
 import logging
 import struct
@@ -229,19 +228,3 @@ def _make_signature(signer_func, data_to_sign, public_algo,
     return bytes(header + hashed + unhashed +
                  digest[:2] +  # used for decoder's sanity check
                  sig)  # actual ECDSA signature
-
-
-def _split_lines(body, size):
-    lines = []
-    for i in range(0, len(body), size):
-        lines.append(body[i:i+size] + '\n')
-    return ''.join(lines)
-
-
-def armor(blob, type_str):
-    """See https://tools.ietf.org/html/rfc4880#section-6 for details."""
-    head = '-----BEGIN PGP {}-----\nVersion: GnuPG v2\n\n'.format(type_str)
-    body = base64.b64encode(blob)
-    checksum = base64.b64encode(util.crc24(blob))
-    tail = '-----END PGP {}-----\n'.format(type_str)
-    return head + _split_lines(body, 64) + '=' + checksum + '\n' + tail
diff --git a/trezor_agent/gpg/proto.py b/trezor_agent/gpg/proto.py
index a4f4256..c9a7b21 100644
--- a/trezor_agent/gpg/proto.py
+++ b/trezor_agent/gpg/proto.py
@@ -1,5 +1,6 @@
 """GPG protocol utilities."""
 
+import base64
 import hashlib
 import logging
 import struct
@@ -137,3 +138,19 @@ class PublicKey(object):
         return '<{}>'.format(util.hexlify(self.key_id()))
 
     __str__ = __repr__
+
+
+def _split_lines(body, size):
+    lines = []
+    for i in range(0, len(body), size):
+        lines.append(body[i:i+size] + '\n')
+    return ''.join(lines)
+
+
+def armor(blob, type_str):
+    """See https://tools.ietf.org/html/rfc4880#section-6 for details."""
+    head = '-----BEGIN PGP {}-----\nVersion: GnuPG v2\n\n'.format(type_str)
+    body = base64.b64encode(blob)
+    checksum = base64.b64encode(util.crc24(blob))
+    tail = '-----END PGP {}-----\n'.format(type_str)
+    return head + _split_lines(body, 64) + '=' + checksum + '\n' + tail
diff --git a/trezor_agent/gpg/signer.py b/trezor_agent/gpg/signer.py
index 237d592..e3d5023 100755
--- a/trezor_agent/gpg/signer.py
+++ b/trezor_agent/gpg/signer.py
@@ -7,7 +7,7 @@ import sys
 import time
 import os
 
-from . import decode, encode
+from . import decode, encode, proto
 
 log = logging.getLogger(__name__)
 
@@ -25,7 +25,7 @@ def run_create(args):
         result = s.export()
     s.close()
 
-    sys.stdout.write(encode.armor(result, 'PUBLIC KEY BLOCK'))
+    sys.stdout.write(proto.armor(result, 'PUBLIC KEY BLOCK'))
 
 
 def run_sign(args):
@@ -39,7 +39,7 @@ def run_sign(args):
     sig = s.sign(data)
     s.close()
 
-    sig = encode.armor(sig, 'SIGNATURE')
+    sig = proto.armor(sig, 'SIGNATURE')
     decode.verify(pubkey=pubkey, signature=sig, original_data=data)
 
     filename = '-'  # write to stdout