1 files changed, 83 insertions, 0 deletions
diff --git a/frozen_deps/ecdsa/ssh.py b/frozen_deps/ecdsa/ssh.py
new file mode 100644
index 0000000..64e9403
--- /dev/null
+++ b/frozen_deps/ecdsa/ssh.py
@@ -0,0 +1,83 @@
+import binascii
+from . import der
+from ._compat import compat26_str, int_to_bytes
+
+_SSH_ED25519 = b"ssh-ed25519"
+_SK_MAGIC = b"openssh-key-v1\0"
+_NONE = b"none"
+
+
+def _get_key_type(name):
+    if name == "Ed25519":
+        return _SSH_ED25519
+    else:
+        raise ValueError("Unsupported key type")
+
+
+class _Serializer:
+    def __init__(self):
+        self.bytes = b""
+
+    def put_raw(self, val):
+        self.bytes += val
+
+    def put_u32(self, val):
+        self.bytes += int_to_bytes(val, length=4, byteorder="big")
+
+    def put_str(self, val):
+        self.put_u32(len(val))
+        self.bytes += val
+
+    def put_pad(self, blklen=8):
+        padlen = blklen - (len(self.bytes) % blklen)
+        self.put_raw(bytearray(range(1, 1 + padlen)))
+
+    def encode(self):
+        return binascii.b2a_base64(compat26_str(self.bytes))
+
+    def tobytes(self):
+        return self.bytes
+
+    def topem(self):
+        return der.topem(self.bytes, "OPENSSH PRIVATE KEY")
+
+
+def serialize_public(name, pub):
+    serial = _Serializer()
+    ktype = _get_key_type(name)
+    serial.put_str(ktype)
+    serial.put_str(pub)
+    return b" ".join([ktype, serial.encode()])
+
+
+def serialize_private(name, pub, priv):
+    # encode public part
+    spub = _Serializer()
+    ktype = _get_key_type(name)
+    spub.put_str(ktype)
+    spub.put_str(pub)
+
+    # encode private part
+    spriv = _Serializer()
+    checksum = 0
+    spriv.put_u32(checksum)
+    spriv.put_u32(checksum)
+    spriv.put_raw(spub.tobytes())
+    spriv.put_str(priv + pub)
+    comment = b""
+    spriv.put_str(comment)
+    spriv.put_pad()
+
+    # top-level structure
+    main = _Serializer()
+    main.put_raw(_SK_MAGIC)
+    ciphername = kdfname = _NONE
+    main.put_str(ciphername)
+    main.put_str(kdfname)
+    nokdf = 0
+    main.put_u32(nokdf)
+    nkeys = 1
+    main.put_u32(nkeys)
+    main.put_str(spub.tobytes())
+    main.put_str(spriv.tobytes())
+    return main.topem()