From 382449d6bb06abbdd515fcd7c18c67ff7726ccea Mon Sep 17 00:00:00 2001
From: Gergely Polonkai <gergely@polonkai.eu>
Date: Mon, 11 Apr 2022 15:45:45 +0200
Subject: [PATCH] Initial version with identity handling

---
 .coveragerc                     |   7 +
 .gitignore                      |   1 +
 LICENSE                         |  57 +++
 README.rst                      |  46 +++
 earthsnake/__init__.py          |  17 +
 earthsnake/base32.py            |  54 +++
 earthsnake/exc.py               |  13 +
 earthsnake/identity.py          | 134 +++++++
 earthsnake/types.py             |   7 +
 mypy-stubs/ed25519/__init__.pyi |  22 ++
 mypy-stubs/ed25519/_version.pyi |   3 +
 mypy-stubs/ed25519/keys.pyi     |  32 ++
 poetry.lock                     | 636 ++++++++++++++++++++++++++++++++
 pyproject.toml                  |  28 ++
 tests/__init__.py               |   0
 tests/conftest.py               |  30 ++
 tests/helpers.py                |  12 +
 tests/test_base32.py            |  56 +++
 tests/test_identity.py          | 185 ++++++++++
 19 files changed, 1340 insertions(+)
 create mode 100644 .coveragerc
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 README.rst
 create mode 100644 earthsnake/__init__.py
 create mode 100644 earthsnake/base32.py
 create mode 100644 earthsnake/exc.py
 create mode 100644 earthsnake/identity.py
 create mode 100644 earthsnake/types.py
 create mode 100644 mypy-stubs/ed25519/__init__.pyi
 create mode 100644 mypy-stubs/ed25519/_version.pyi
 create mode 100644 mypy-stubs/ed25519/keys.pyi
 create mode 100644 poetry.lock
 create mode 100644 pyproject.toml
 create mode 100644 tests/__init__.py
 create mode 100644 tests/conftest.py
 create mode 100644 tests/helpers.py
 create mode 100644 tests/test_base32.py
 create mode 100644 tests/test_identity.py

diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..dcbb42f
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,7 @@
+[run]
+branch = True
+
+[report]
+fail_under = 100
+show_missing = true
+skip_covered = true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1bc5aa1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/.coverage
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..b5ad926
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,57 @@
+GNU LESSER GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright © 2007 Free Software Foundation, Inc. <https://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed.
+
+This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.
+
+0. Additional Definitions.
+As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License.
+
+“The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.
+
+An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library.
+
+A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”.
+
+The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version.
+
+The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work.
+
+1. Exception to Section 3 of the GNU GPL.
+You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL.
+
+2. Conveying Modified Versions.
+If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version:
+
+a) under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the function or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or
+b) under the GNU GPL, with none of the additional permissions of this License applicable to that copy.
+3. Object Code Incorporating Material from Library Header Files.
+The object code form of an Application may incorporate material from a header file that is part of the Library. You may convey such object code under terms of your choice, provided that, if the incorporated material is not limited to numerical parameters, data structure layouts and accessors, or small macros, inline functions and templates (ten or fewer lines in length), you do both of the following:
+
+a) Give prominent notice with each copy of the object code that the Library is used in it and that the Library and its use are covered by this License.
+b) Accompany the object code with a copy of the GNU GPL and this license document.
+4. Combined Works.
+You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications, if you also do each of the following:
+
+a) Give prominent notice with each copy of the Combined Work that the Library is used in it and that the Library and its use are covered by this License.
+b) Accompany the Combined Work with a copy of the GNU GPL and this license document.
+c) For a Combined Work that displays copyright notices during execution, include the copyright notice for the Library among these notices, as well as a reference directing the user to the copies of the GNU GPL and this license document.
+d) Do one of the following:
+0) Convey the Minimal Corresponding Source under the terms of this License, and the Corresponding Application Code in a form suitable for, and under terms that permit, the user to recombine or relink the Application with a modified version of the Linked Version to produce a modified Combined Work, in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.
+1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user's computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version.
+e) Provide Installation Information, but only if you would otherwise be required to provide such information under section 6 of the GNU GPL, and only to the extent that such information is necessary to install and execute a modified version of the Combined Work produced by recombining or relinking the Application with a modified version of the Linked Version. (If you use option 4d0, the Installation Information must accompany the Minimal Corresponding Source and Corresponding Application Code. If you use option 4d1, you must provide the Installation Information in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source.)
+5. Combined Libraries.
+You may place library facilities that are a work based on the Library side by side in a single library together with other library facilities that are not Applications and are not covered by this License, and convey such a combined library under terms of your choice, if you do both of the following:
+
+a) Accompany the combined library with a copy of the same work based on the Library, uncombined with any other library facilities, conveyed under the terms of this License.
+b) Give prominent notice with the combined library that part of it is a work based on the Library, and explaining where to find the accompanying uncombined form of the same work.
+6. Revised Versions of the GNU Lesser General Public License.
+The Free Software Foundation may publish revised and/or new versions of the GNU Lesser General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Library as you received it specifies that a certain numbered version of the GNU Lesser General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that published version or of any later version published by the Free Software Foundation. If the Library as you received it does not specify a version number of the GNU Lesser General Public License, you may choose any version of the GNU Lesser General Public License ever published by the Free Software Foundation.
+
+If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall apply, that proxy's public statement of acceptance of any version is permanent authorization for you to choose that version for the Library.
+
diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..1fccf88
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,46 @@
+Python implementation of Earthstar
+##################################
+
+**WARNING!**
+
+This library is very limited in functionality, and is under active development.  Be prepared for
+things to break.
+
+Usage
+=====
+
+Create an identity and save it as a mnemonic:
+
+.. code-block:: python
+
+   from earthsnake import Identity
+
+   identity = Identity('test')
+   mnemonic = identity.mnemonic
+
+Then you can load it back from the mnemonic:
+
+.. code-block:: python
+
+   identity = Identity.from_mnemonic(mnemonic)
+
+Development
+===========
+
+Type checking:
+
+.. code-block:: sh
+
+   env MYPYPATH=mypy-stubs poetry run mypy --strict earthsnake tests
+
+Static linting:
+
+.. code-block:: sh
+
+   poetry run pylint earthsnake tests
+
+Tests:
+
+.. code-block:: sh
+
+   poetry run pytest -vv --cov=. tests
diff --git a/earthsnake/__init__.py b/earthsnake/__init__.py
new file mode 100644
index 0000000..4aff3ca
--- /dev/null
+++ b/earthsnake/__init__.py
@@ -0,0 +1,17 @@
+"""Earthsnake - An Earthstar implementation in Python
+##################################################
+
+Usage example
+=============
+
+.. code-block:: python
+
+   import earthsnake
+
+   identity = earthsnake.Identity('test')
+   mnemonic = identity.mnemonic
+"""
+
+__version__ = '0.1.0'
+
+from .identity import Identity
diff --git a/earthsnake/base32.py b/earthsnake/base32.py
new file mode 100644
index 0000000..a8c688b
--- /dev/null
+++ b/earthsnake/base32.py
@@ -0,0 +1,54 @@
+"""Base32 encoding/decoding
+
+For base32 encoding we use rfc4648, no padding, lowercase, prefixed with "b".
+
+Base32 character set: 'abcdefghijklmnopqrstuvwxyz234567'
+
+The Multibase format adds a "b" prefix to specify this particular encoding.
+We leave the "b" prefix there because we don't want the encoded string
+to start with a number (so we can use it as a URL location).
+
+When decoding, we require it to start with a "b" -- no other multibase formats are allowed.
+
+The decoding must be strict (it doesn't allow a 1 in place of an i, etc).
+"""
+
+from base64 import b32decode, b32encode
+
+
+def base32_bytes_to_string(bytes_: bytes) -> str:
+    """Encode uint8array bytes to base32 string"""
+
+    return 'b' + b32encode(bytes_).lower().strip(b'=').decode('utf-8')
+
+
+def base32_string_to_bytes(string: str) -> bytes:
+    """Decode base32 string to a uint8array of bytes
+
+    :raises ValidationError: if the string is bad
+    """
+
+    if not string.startswith("b"):
+        raise ValueError(
+            f"can't decode base32 string - it should start with a 'b'. {str}"
+        )
+
+    string = string[1:]
+
+    # this library combines padding and looseness settings into a single "loose" option, so
+    # we have to set "loose: true" in order to handle unpadded inputs.
+    # with a custom codec, loose mode:
+    # -- allows padding or no padding -- we have to check for this
+    # -- does not allow uppercase -- good
+    # -- does not allow 1/i substitution -- good
+
+    # make sure no padding characters are on the end
+    if string.endswith("="):
+        raise ValueError(
+            "can't decode base32 string - it contains padding characters ('=')"
+        )
+
+    pad_length = 8 - len(string) % 8
+    string += '=' * pad_length
+
+    return b32decode(string.upper())
diff --git a/earthsnake/exc.py b/earthsnake/exc.py
new file mode 100644
index 0000000..1168f0c
--- /dev/null
+++ b/earthsnake/exc.py
@@ -0,0 +1,13 @@
+"""Exception types for Earthsnake
+"""
+
+class EarthsnakeError(Exception):
+    """Basic Earthsnake error
+
+    Should not be used except as a base type.
+    """
+
+
+class ValidationError(EarthsnakeError):
+    """Raised when something doesn’t pass as a valid Earthsnake object
+    """
diff --git a/earthsnake/identity.py b/earthsnake/identity.py
new file mode 100644
index 0000000..1f68112
--- /dev/null
+++ b/earthsnake/identity.py
@@ -0,0 +1,134 @@
+"""Identity management"""
+
+import re
+from typing import Optional
+
+import bip39
+from ed25519 import SigningKey, VerifyingKey, create_keypair
+
+from .base32 import base32_bytes_to_string, base32_string_to_bytes
+from .exc import ValidationError
+from .types import ALPHA_LOWER, ALPHA_LOWER_OR_DIGIT, B32_CHAR
+
+
+class Identity:
+    """Class representing and Earthstar identity
+
+    .. code-block:: python
+
+       identity = Identity()
+       mnemonic = identity.mnemonic
+       identity = Identity.from_mnemonic(mnemonic)
+    """
+
+    _KEY_PATTERN = f'b[{B32_CHAR}]{{52}}'
+    _NAME_PATTERN = f'[{ALPHA_LOWER}][{ALPHA_LOWER_OR_DIGIT}]{{3}}'
+    _PATTERN = f'^@{_NAME_PATTERN}\\.{_KEY_PATTERN}$'
+    _SECRET_PATTERN = f'^{_KEY_PATTERN}$'
+
+    def __init__(
+        self,
+        name: str,
+        verify_key: Optional[VerifyingKey] = None,
+        sign_key: Optional[SigningKey] = None,
+    ) -> None:
+        if not self.valid_name(name):
+            raise ValidationError(f'Invalid name: {name}')
+
+        if (
+            sign_key
+            and verify_key
+            and sign_key.get_verifying_key().to_bytes() != verify_key.to_bytes()
+        ):
+            raise ValidationError('Signing and verifying keys don’t match')
+
+        if sign_key and not verify_key:
+            verify_key = sign_key.get_verifying_key()
+
+        if not verify_key:
+            raise ValidationError('At least verify_key must be present')
+
+        self.name = name
+        self.verify_key = verify_key
+        self.sign_key = sign_key
+
+    def __str__(self) -> str:
+        return f'@{self.name}.{base32_bytes_to_string(self.verify_key.to_bytes())}'
+
+    def __repr__(self) -> str:
+        return f'<Identity {self}>'
+
+    @classmethod
+    def from_address(cls, address: str) -> 'Identity':
+        """Load an identity from an author address"""
+
+        if not cls.valid_address(address):
+            raise ValidationError(f'Invalid address {address}')
+
+        address = address[1:]
+        name, verify_key_data = address.split('.')
+
+        verify_key_bytes = base32_string_to_bytes(verify_key_data)
+        verify_key = VerifyingKey(verify_key_bytes)
+
+        return cls(name, verify_key=verify_key)
+
+    @classmethod
+    def valid_name(cls, name: str) -> bool:
+        """Validate an address’ name part"""
+
+        return bool(re.match(f'^{cls._NAME_PATTERN}$', name))
+
+    @classmethod
+    def valid_address(cls, address: str) -> bool:
+        """Validate an author address"""
+
+        if not address.startswith('@'):
+            return False
+
+        address = address[1:]
+
+        try:
+            name, verify_key_data = address.split('.')
+        except ValueError:
+            return False
+
+        try:
+            verify_key_bytes = base32_string_to_bytes(verify_key_data)
+            VerifyingKey(verify_key_bytes)
+        except BaseException:  # pylint: disable=broad-except
+            return False
+
+        return cls.valid_name(name)
+
+    @classmethod
+    def generate(cls, name: str) -> 'Identity':
+        """Generate a new entity"""
+
+        sign_key, verify_key = create_keypair()
+
+        return cls(name, verify_key=verify_key, sign_key=sign_key)
+
+    @classmethod
+    def from_mnemonic(cls, mnemonic: str) -> 'Identity':
+        """Load an identity from a mnemonic"""
+
+        name, mnemonic = mnemonic.split(' ', 1)
+        seed = bip39.decode_phrase(mnemonic)
+        sign_key = SigningKey(seed)
+
+        return cls(name, sign_key=sign_key)
+
+    @property
+    def mnemonic(self) -> Optional[str]:
+        """Convert the identify to a BIP39 mnemonic
+
+        If the identity doesn’t have a stored signing (secret) key, it returns None."""
+
+        if self.sign_key is None:
+            return None
+
+        seed = self.sign_key.to_seed()
+        mnemonic = bip39.encode_bytes(seed)
+
+        return f'{self.name} {mnemonic}'
diff --git a/earthsnake/types.py b/earthsnake/types.py
new file mode 100644
index 0000000..e873e28
--- /dev/null
+++ b/earthsnake/types.py
@@ -0,0 +1,7 @@
+"""Generic types and definitions
+"""
+
+ALPHA_LOWER = 'abcdefghijklmnopqrstuvwxyz'
+DIGIT = '0123456789'
+B32_CHAR = ALPHA_LOWER + '234567'
+ALPHA_LOWER_OR_DIGIT = ALPHA_LOWER + DIGIT
diff --git a/mypy-stubs/ed25519/__init__.pyi b/mypy-stubs/ed25519/__init__.pyi
new file mode 100644
index 0000000..a1ed283
--- /dev/null
+++ b/mypy-stubs/ed25519/__init__.pyi
@@ -0,0 +1,22 @@
+from .keys import (
+    BadSignatureError,
+    BadPrefixError,
+    create_keypair,
+    SigningKey,
+    VerifyingKey,
+    remove_prefix,
+    to_ascii,
+    from_ascii,
+)
+
+__all__ = (
+    'BadSignatureError',
+    'BadPrefixError',
+    'create_keypair',
+    'SigningKey',
+    'VerifyingKey',
+    'remove_prefix',
+    'to_ascii',
+    'from_ascii',
+    '__version__'
+)
diff --git a/mypy-stubs/ed25519/_version.pyi b/mypy-stubs/ed25519/_version.pyi
new file mode 100644
index 0000000..85ddc0d
--- /dev/null
+++ b/mypy-stubs/ed25519/_version.pyi
@@ -0,0 +1,3 @@
+version_json: str
+
+def get_versions(): ...
diff --git a/mypy-stubs/ed25519/keys.pyi b/mypy-stubs/ed25519/keys.pyi
new file mode 100644
index 0000000..4a23d89
--- /dev/null
+++ b/mypy-stubs/ed25519/keys.pyi
@@ -0,0 +1,32 @@
+from typing import Any, Callable, Optional, Tuple
+
+BadSignatureError: Any
+
+def create_keypair(entropy: Callable[[int], bytes] = ...) -> Tuple[SigningKey, VerifyingKey]: ...
+
+class BadPrefixError(Exception): ...
+
+def remove_prefix(s_bytes: bytes, prefix: bytes) -> bytes: ...
+def to_ascii(s_bytes: bytes, prefix: str = ..., encoding: str = ...) -> str: ...
+def from_ascii(s_ascii: str, prefix: str = ..., encoding: str = ...) -> bytes: ...
+
+class SigningKey:
+    sk_s: bytes
+    vk_s: bytes
+    def __init__(self, sk_s: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> None: ...
+    def to_bytes(self, prefix: str = ...) -> bytes: ...
+    def to_ascii(self, prefix: str = ..., encoding: Optional[str] = ...) -> str: ...
+    def to_seed(self, prefix: str = ...) -> bytes: ...
+    def __eq__(self, them: object) -> bool: ...
+    def get_verifying_key(self) -> VerifyingKey: ...
+    def sign(self, msg: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> bytes: ...
+
+class VerifyingKey:
+    vk_s: bytes
+    def __init__(self, vk_s: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> None: ...
+    def to_bytes(self, prefix: str = ...) -> bytes: ...
+    def to_ascii(self, prefix: str = ..., encoding: Optional[str] = ...) -> str: ...
+    def __eq__(self, them: object) -> bool: ...
+    def verify(self, sig: bytes, msg: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> bool: ...
+
+def selftest() -> None: ...
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..30b24ef
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,636 @@
+[[package]]
+name = "astroid"
+version = "2.11.2"
+description = "An abstract syntax tree for Python with inference support."
+category = "dev"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+lazy-object-proxy = ">=1.4.0"
+wrapt = ">=1.11,<2"
+
+[[package]]
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "21.4.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins", "cloudpickle"]
+
+[[package]]
+name = "bip39"
+version = "0.0.2"
+description = "A self-contained and simple BIP39 implementation in Python"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+dev = ["pytest"]
+
+[[package]]
+name = "black"
+version = "22.3.0"
+description = "The uncompromising code formatter."
+category = "dev"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.7.4)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
+name = "click"
+version = "8.1.2"
+description = "Composable command line interface toolkit"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "coverage"
+version = "6.3.2"
+description = "Code coverage measurement for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "dill"
+version = "0.3.4"
+description = "serialize all of python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*"
+
+[package.extras]
+graph = ["objgraph (>=1.7.2)"]
+
+[[package]]
+name = "ed25519"
+version = "1.5"
+description = "Ed25519 public-key signatures"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..db5a25f
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,28 @@
+[tool.poetry]
+name = "earthsnake"
+version = "0.1.0"
+description = ""
+authors = ["Gergely Polonkai <gergely@polonkai.eu>"]
+
+[tool.poetry.dependencies]
+python = "^3.10"
+ed25519 = "^1.5"
+bip39 = "^0.0.2"
+
+[tool.poetry.dev-dependencies]
+pytest = "^7.1.1"
+pylint = "^2.13.5"
+pytest-mock = "^3.7.0"
+black = "^22.3.0"
+mypy = "^0.942"
+pytest-cov = "^3.0.0"
+
+[tool.pytest.ini_options]
+markers = [
+  "id_key_seed: seed to create an identity secret from",
+  "id_name: the name to use in the identity"
+]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..e5e3af7
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,30 @@
+"""Test configuration and global fixtures
+"""
+
+from ed25519 import SigningKey
+import pytest
+from _pytest.fixtures import SubRequest
+
+from earthsnake.identity import Identity
+
+from .helpers import random_name
+
+
+@pytest.fixture
+def identity(request: SubRequest) -> Identity:
+    """A valid identity"""
+
+    seed = b''
+    name = random_name()
+
+    for marker in request.node.iter_markers('id_key_seed'):
+        for seed in marker.args:
+            pass
+
+    for marker in request.node.iter_markers('id_name'):
+        for name in marker.args:
+            pass
+
+    sign = SigningKey(seed)
+
+    return Identity(name, sign_key=sign)
diff --git a/tests/helpers.py b/tests/helpers.py
new file mode 100644
index 0000000..f47e849
--- /dev/null
+++ b/tests/helpers.py
@@ -0,0 +1,12 @@
+"""Helper functions for tests
+"""
+
+from random import choice
+
+from earthsnake.types import ALPHA_LOWER, ALPHA_LOWER_OR_DIGIT
+
+
+def random_name() -> str:
+    """Generate a valid random author name"""
+
+    return choice(ALPHA_LOWER) + ''.join(choice(ALPHA_LOWER_OR_DIGIT) for _ in range(3))
diff --git a/tests/test_base32.py b/tests/test_base32.py
new file mode 100644
index 0000000..47facc3
--- /dev/null
+++ b/tests/test_base32.py
@@ -0,0 +1,56 @@
+"""Tests for the base32 encode/decode utilities
+"""
+
+from base64 import _b32decode, _b32encode  # type: ignore
+from base64 import b32decode, b32encode
+from random import choice
+
+import pytest
+
+from earthsnake.base32 import base32_bytes_to_string, base32_string_to_bytes
+from earthsnake.types import B32_CHAR
+
+
+def test_alphabet() -> None:
+    """Test if Python’s Base32 alphabet is the uppercase version of the one we expect"""
+
+    alphabet = B32_CHAR.encode('utf-8')
+    test_data = b'\x00D2\x14\xc7BT\xb65\xcf\x84e:V\xd7\xc6u\xbew\xdf'
+    test_encoded = B32_CHAR.upper().encode('utf-8')
+
+    assert _b32encode(alphabet, test_data) == b32encode(test_data).lower()
+    assert _b32decode(alphabet, alphabet) == b32decode(test_encoded)
+
+
+def test_bytes_to_string() -> None:
+    """Test if base32_bytes_to_string encodes bytes as expected"""
+
+    data = bytes(choice(range(255)) for _ in range(10))
+    our_version = base32_bytes_to_string(data)
+    py_version = 'b' + b32encode(data).lower().strip(b'=').decode('utf-8')
+
+    assert our_version == py_version
+
+
+def test_string_to_bytes_noprefix() -> None:
+    """Test if base32_string_to_bytes refuses to decode strings without the 'b' prefix"""
+
+    with pytest.raises(ValueError) as ctx:
+        base32_string_to_bytes('test')
+
+    assert 'it should start with a \'b\'' in str(ctx.value)
+
+
+def test_string_to_bytes_padding() -> None:
+    """Test if base32_string_to_bytes refuses to decode strings with padding characters"""
+
+    with pytest.raises(ValueError) as ctx:
+        base32_string_to_bytes('btest=')
+
+    assert 'it contains padding characters (\'=\')' in str(ctx.value)
+
+
+def test_string_to_bytes() -> None:
+    """Test if base32_string_to_bytes dedoces strings as expected"""
+
+    assert base32_string_to_bytes('borsxg5a') == b'test'
diff --git a/tests/test_identity.py b/tests/test_identity.py
new file mode 100644
index 0000000..95af054
--- /dev/null
+++ b/tests/test_identity.py
@@ -0,0 +1,185 @@
+"""Tests for the Identity class
+"""
+
+import bip39
+from ed25519 import SigningKey, create_keypair
+import pytest
+from pytest_mock.plugin import MockerFixture
+
+from earthsnake.exc import ValidationError
+from earthsnake.identity import Identity
+
+from .helpers import random_name
+
+TEST_SEED = (
+    b'\xe5:\xc9\x95$\x9d\xc5F\xee\xe6\x84\xbe\xcc\xda^\xc4'
+    b'z\x84\xb7\xd2\x02q\xfa\xe8W\xd8z\x05E\xfb2\xd5'
+)
+TEST_MNEMONIC = bip39.encode_bytes(TEST_SEED)
+
+
+@pytest.mark.parametrize(
+    'name',
+    [
+        pytest.param('s', id='veryshort'),
+        pytest.param('sho', id='short'),
+        pytest.param('longy', id='long'),
+        pytest.param('verylong', id='verylong'),
+        pytest.param('0num', id='numberstart'),
+    ],
+)
+def test_init_bad_name(name: str) -> None:
+    """Test if initialisation is not possible with an invalid name"""
+
+    sign, verify = create_keypair()
+
+    with pytest.raises(ValidationError) as ctx:
+        Identity(name, verify_key=verify, sign_key=sign)
+
+    assert 'Invalid name' in str(ctx.value)
+
+
+def test_init_key_mismatch() -> None:
+    """Test if initialisation fails if the signing and verifying keys don’t match"""
+
+    sign1, _ = create_keypair()
+    _, verify2 = create_keypair()
+
+    with pytest.raises(ValidationError) as ctx:
+        Identity('name', verify_key=verify2, sign_key=sign1)
+
+    assert 'Signing and verifying keys don’t match' in str(ctx.value)
+
+
+def test_init_no_keys() -> None:
+    """Test if initialisation is not possible without keys"""
+
+    with pytest.raises(ValidationError) as ctx:
+        Identity('name')
+
+    assert 'At least verify_key must be present' in str(ctx.value)
+
+
+@pytest.mark.id_key_seed(TEST_SEED)
+@pytest.mark.id_name('test')
+def test_str(identity: Identity) -> None:
+    """Test if the __str__ method returns the author address"""
+
+    assert (
+        str(identity) == '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )
+
+
+@pytest.mark.id_key_seed(TEST_SEED)
+@pytest.mark.id_name('test')
+def test_repr(identity: Identity) -> None:
+    """Test if the __str__ method returns the author address"""
+
+    assert (
+        repr(identity) == '<Identity @test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya>'
+    )
+
+
+def test_from_address() -> None:
+    """Test loading an identity from an author address"""
+
+    skey = SigningKey(TEST_SEED)
+    vkey = skey.get_verifying_key()
+    identity = Identity.from_address(
+        '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )
+
+    assert identity.name == 'test'
+    assert identity.sign_key is None
+    assert identity.verify_key.to_bytes() == vkey.to_bytes()
+
+
+def test_from_invalid_address() -> None:
+    """Test loading an identity from an invalid address"""
+
+    with pytest.raises(ValidationError) as ctx:
+        Identity.from_address('@inva.lid')
+
+    assert 'Invalid address @inva.lid' in str(ctx.value)
+
+
+def test_generate(mocker: MockerFixture) -> None:
+    """Test the generate property"""
+
+    skey = SigningKey(TEST_SEED)
+    vkey = skey.get_verifying_key()
+
+    mocker.patch('earthsnake.identity.create_keypair', return_value=(skey, vkey))
+    identity = Identity.generate('test')
+
+    assert (
+        str(identity) == '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )
+    assert identity.sign_key
+    assert identity.verify_key
+    assert identity.name == 'test'
+
+
+@pytest.mark.id_key_seed(TEST_SEED)
+@pytest.mark.id_name('test')
+def test_mnemonic(identity: Identity) -> None:
+    """Test the mnemonic property"""
+
+    assert identity.mnemonic == f'test {TEST_MNEMONIC}'
+
+
+def test_mnemonic_no_signing_key() -> None:
+    """Test if the mnemonic property returns None if there is no signing key"""
+
+    identity = Identity.from_address(
+        '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )
+
+    assert identity.mnemonic is None
+
+
+def test_from_mnemonic() -> None:
+    """Test if identities can be loaded from mnemonics"""
+
+    name = random_name()
+    identity = Identity.from_mnemonic(f'{name} {TEST_MNEMONIC}')
+
+    assert identity.name == name
+    assert identity.sign_key
+    assert identity.sign_key.to_seed() == TEST_SEED
+    assert (
+        str(identity)
+        == f'@{name}.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )
+
+
+@pytest.mark.parametrize(
+    'address',
+    [
+        pytest.param(
+            'noat.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya', id='no_at'
+        ),
+        pytest.param(
+            '@toolong.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            id='too_long',
+        ),
+        pytest.param('@test.invalidkey', id='invalid_key'),
+        pytest.param(
+            '@test.cz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
+            id='nonprefixed_key',
+        ),
+        pytest.param('@test.many.periods', id='many_periods'),
+    ],
+)
+def test_valid_address_invalid(address: str) -> None:
+    """Test if valid_address fails for invalid addresses"""
+
+    assert Identity.valid_address(address) is False
+
+
+def test_valid_address() -> None:
+    """Test if valid_address passes on valid addresses"""
+
+    assert Identity.valid_address(
+        '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
+    )