{
    "info": {
        "author": "Weiliang Li",
        "author_email": "to.be.impressive@gmail.com",
        "bugtrack_url": null,
        "classifiers": [
            "Development Status :: 4 - Beta",
            "Intended Audience :: Developers",
            "License :: OSI Approved :: MIT License",
            "Natural Language :: English",
            "Operating System :: OS Independent",
            "Programming Language :: Python",
            "Programming Language :: Python :: 3.5",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Programming Language :: Python :: Implementation :: CPython",
            "Topic :: Security :: Cryptography"
        ],
        "description": "# eciespy\n\n[![Codacy Badge](https://api.codacy.com/project/badge/Grade/2a11aeb9939244019d2c64bce3ff3c4e)](https://www.codacy.com/app/ecies/py)\n[![CI](https://img.shields.io/circleci/project/github/ecies/py.svg)](https://circleci.com/gh/ecies/py)\n[![Codecov](https://img.shields.io/codecov/c/github/ecies/py.svg)](https://codecov.io/gh/ecies/py)\n[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/eciespy.svg)](https://pypi.org/project/eciespy/)\n[![PyPI](https://img.shields.io/pypi/v/eciespy.svg)](https://pypi.org/project/eciespy/)\n[![License](https://img.shields.io/github/license/ecies/py.svg)](https://github.com/ecies/py)\n\nElliptic Curve Integrated Encryption Scheme for secp256k1 in Python.\n\nOther language versions:\n\n-   [TypeScript](https://github.com/ecies/js)\n-   [Rust](https://github.com/ecies/rs)\n-   [Golang](https://github.com/ecies/go)\n\nYou can also check a flask web backend demo [here](https://github.com/kigawas/eciespy-demo).\n\n## Install\n\nInstall with `pip install eciespy` under Python 3.5+.\n\n## Quick Start\n\n```python\n>>> from ecies.utils import generate_eth_key, generate_key\n>>> from ecies import encrypt, decrypt\n>>> eth_k = generate_eth_key()\n>>> prvhex = eth_k.to_hex()\n>>> pubhex = eth_k.public_key.to_hex()\n>>> data = b'this is a test'\n>>> decrypt(prvhex, encrypt(pubhex, data))\nb'this is a test'\n>>> secp_k = generate_key()\n>>> prvhex = secp_k.to_hex()\n>>> pubhex = secp_k.public_key.format(True).hex()\n>>> decrypt(prvhex, encrypt(pubhex, data))\nb'this is a test'\n```\n\nOr just use a builtin command `eciespy` in your favorite [command line](#command-line-interface).\n\n## API\n\n### `ecies.encrypt(receiver_pk: Union[str, bytes], msg: bytes) -> bytes`\n\nParameters:\n\n-   **receiver_pk** - Receiver's public key (hex str or bytes)\n-   **msg** - Data to encrypt\n\nReturns:  **bytes**\n\n### `ecies.decrypt(receiver_sk: Union[str, bytes], msg: bytes) -> bytes`\n\nParameters:\n\n-   **receiver_sk** - Receiver's private key (hex str or bytes)\n-   **msg** - Data to decrypt\n\nReturns:  **bytes**\n\n## Command Line Interface\n\n### Show help\n\n```console\n$ eciespy -h\nusage: eciespy [-h] [-e] [-d] [-g] [-k KEY] [-D [DATA]] [-O [OUT]]\n\nElliptic Curve Integrated Encryption Scheme for secp256k1 in Python\n\noptional arguments:\n  -h, --help            show this help message and exit\n  -e, --encrypt         encrypt with public key, exclusive with -d\n  -d, --decrypt         decrypt with private key, exclusive with -e\n  -g, --generate        generate ethereum key pair\n  -k KEY, --key KEY     public or private key file\n  -D [DATA], --data [DATA]\n                        file to encrypt or decrypt, if not specified, it will\n                        read from stdin\n  -O [OUT], --out [OUT]\n                        encrypted or decrypted file, if not specified, it will\n                        write to stdout\n```\n\n### Generate eth key\n\n```console\n$ eciespy -g\nPrivate: 0x95d3c5e483e9b1d4f5fc8e79b2deaf51362980de62dbb082a9a4257eef653d7d\nPublic: 0x98afe4f150642cd05cc9d2fa36458ce0a58567daeaf5fde7333ba9b403011140a4e28911fcf83ab1f457a30b4959efc4b9306f514a4c3711a16a80e3b47eb58b\nAddress: 0x47e801184B3a8ea8E6A4A7A4CFEfEcC76809Da72\n```\n\n### Encrypt with public key and decrypt with private key\n\n```console\n$ echo '0x95d3c5e483e9b1d4f5fc8e79b2deaf51362980de62dbb082a9a4257eef653d7d' > prv\n$ echo '0x98afe4f150642cd05cc9d2fa36458ce0a58567daeaf5fde7333ba9b403011140a4e28911fcf83ab1f457a30b4959efc4b9306f514a4c3711a16a80e3b47eb58b' > pub\n$ echo 'helloworld' | eciespy -e -k pub | eciespy -d -k prv\nhelloworld\n$ echo 'data to encrypt' > data\n$ eciespy -e -k pub -D data -O enc_data\n$ eciespy -d -k prv -D enc_data\ndata to encrypt\n$ rm data enc_data\n```\n\n## Mechanism and implementation details\n\nThis library combines `secp256k1` and `AES-256-GCM` (powered by [`coincurve`](https://github.com/ofek/coincurve) and [`pycryptodome`](https://github.com/Legrandin/pycryptodome)) to provide an API of encrypting with `secp256k1` public key and decrypting with `secp256k1`'s private key. It has two parts generally:\n\n1.  Use [ECDH](https://en.wikipedia.org/wiki/Elliptic-curve_Diffie\u2013Hellman) to exchange an AES session key;\n\n    > Notice that the sender public key is generated every time when `ecies.encrypt` is invoked, thus, the AES session key varies.\n\n2.  Use this AES session key to encrypt/decrypt the data under `AES-256-GCM`.\n\nBasically the encrypted data will be like this:\n\n```plaintext\n+-------------------------------+----------+----------+-----------------+\n| 65 Bytes                      | 16 Bytes | 16 Bytes | == data size    |\n+-------------------------------+----------+----------+-----------------+\n| Sender Public Key (ephemeral) | Nonce/IV | Tag/MAC  | Encrypted data  |\n+-------------------------------+----------+----------+-----------------+\n| sender_pk                     | nonce    | tag      | encrypted_data  |\n+-------------------------------+----------+----------+-----------------+\n|           Secp256k1           |              AES-256-GCM              |\n+-------------------------------+---------------------------------------+\n```\n\n### Secp256k1\n\n#### Glance at ecdh\n\nSo, **how** do we calculate the ECDH key under `secp256k1`? If you use a library like [`coincurve`](https://github.com/ofek/coincurve), you might just simply call `k1.ecdh(k2.public_key.format())`, then uh-huh, you got it! Let's see how to do it in simple Python snippets:\n\n```python\n>>> from coincurve import PrivateKey\n>>> k1 = PrivateKey(b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x01')\n>>> k2 = PrivateKey(b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x02')\n>>> k1.public_key.format(False).hex() # 65 bytes, False means uncompressed key\n'0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8'\n>>> k2.public_key.format(False).hex() # 65 bytes\n'04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a'\n>>> k1.ecdh(k2.public_key.format()).hex()\n'b1c9938f01121e159887ac2c8d393a22e4476ff8212de13fe1939de2a236f0a7'\n>>> k2.ecdh(k1.public_key.format()).hex()\n'b1c9938f01121e159887ac2c8d393a22e4476ff8212de13fe1939de2a236f0a7'\n```\n\n#### Calculate your ecdh key manually\n\nHowever, as a hacker like you with strong desire to learn something, you must be curious about the magic under the ground.\n\nIn one sentence, the `secp256k1`'s ECDH key of `k1` and `k2` is nothing but `sha256(k2.public_key.multiply(k1))`.\n\n```python\n>>> k1.to_int()\n1\n>>> shared_pub = k2.public_key.multiply(bytes.fromhex(k1.to_hex()))\n>>> shared_pub.point()\n(89565891926547004231252920425935692360644145829622209833684329913297188986597,\n 12158399299693830322967808612713398636155367887041628176798871954788371653930)\n>>> import hashlib\n>>> h = hashlib.sha256()\n>>> h.update(shared_pub.format())\n>>> h.hexdigest()  # here you got the ecdh key same as above!\n'b1c9938f01121e159887ac2c8d393a22e4476ff8212de13fe1939de2a236f0a7'\n```\n\n> Warning: **NEVER** use small integers as private keys on any production systems or storing any valuable assets.\n>\n> Warning: **ALWAYS** use safe methods like [`os.urandom`](https://docs.python.org/3/library/os.html#os.urandom) to generate private keys.\n\n#### Math on ecdh\n\nLet's discuss in details. The word _multiply_ here means multiplying a **point** of a public key on elliptic curve (like `(x, y)`) with a **scalar** (like `k`). Here `k` is the integer format of a private key, for instance, it can be `1` for `k1` here, and `(x, y)` here is an extremely large number pair like `(89565891926547004231252920425935692360644145829622209833684329913297188986597, 12158399299693830322967808612713398636155367887041628176798871954788371653930)`.\n\n> Warning: 1 \\* (x, y) == (x, y) is always true, since 1 is the **identity element** for multiplication.\n\nMathematically, the elliptic curve cryptography is based on the fact that you can easily multiply point `A` (aka [base point](https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#Signature_generation_algorithm), or public key in ECDH) and scalar `k` (aka private key) to get another point `B` (aka public key), but it's almost impossible to calculate `A` from `B` reversely (easy to multiply, hard to divide).\n\n#### Compressed and uncompressed keys\n\nA point multiplying a scalar can be regarded that this point adds itself multiple times, and the point `B` can be converted to a readable public key in a compressed or uncompressed format.\n\n-   Compressed format (`x` coordinate only)\n\n```python\n>>> point = (89565891926547004231252920425935692360644145829622209833684329913297188986597, 12158399299693830322967808612713398636155367887041628176798871954788371653930)\n>>> prefix = '02' if point[1] % 2 == 0 else '03'\n>>> compressed_key_hex = prefix + hex(point[0])[2:]\n>>> compressed_key = bytes.fromhex(compressed_key_hex)\n>>> compressed_key.hex()\n'02c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5'\n```\n\n-   Uncompressed format (`(x, y)` coordinate)\n\n```python\n>>> uncompressed_key_hex = '04' + hex(point[0])[2:] + hex(point[1])[2:]\n>>> uncompressed_key = bytes.fromhex(uncompressed_key_hex)\n>>> uncompressed_key.hex()\n'04c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee51ae168fea63dc339a3c58419466ceaeef7f632653266d0e1236431a950cfe52a'\n```\n\nThe format is depicted by the image below from the [bitcoin book](https://github.com/bitcoinbook/bitcoinbook).\n\n![EC public key format](https://raw.githubusercontent.com/bitcoinbook/bitcoinbook/develop/images/mbc2_0407.png)\n\n> If you want to convert the compressed format to uncompressed, basically, you need to calculate `y` from `x` by solving the equation using [Cipolla's Algorithm](https://en.wikipedia.org/wiki/Cipolla's_algorithm):\n>\n> ![y^2=(x^3 + 7) mod p, where p=2^{256}-2^{32}-2^{9}-2^{8}-2^{7}-2^{6}-2^{4}-1](https://tex.s2cms.ru/svg/%20y%5E2%3D(x%5E3%20%2B%207)%20%5Cbmod%20p%2C%5C%20where%5C%20p%3D2%5E%7B256%7D-2%5E%7B32%7D-2%5E%7B9%7D-2%5E%7B8%7D-2%5E%7B7%7D-2%5E%7B6%7D-2%5E%7B4%7D-1%20)\n>\n> You can check the [bitcoin wiki](https://en.bitcoin.it/wiki/Secp256k1) and this thread on [bitcointalk.org](https://bitcointalk.org/index.php?topic=644919.msg7205689#msg7205689) for more details.\n\nThen, the shared key between `k1` and `k2` is the `sha256` hash of the **compressed** key. It's better to use the compressed format, since you can always get `x` from `x` or `(x, y)` without any calculation.\n\n```python\n>>> h = hashlib.sha256()\n>>> h.update(compressed_key)\n>>> h.hexdigest()\n'b1c9938f01121e159887ac2c8d393a22e4476ff8212de13fe1939de2a236f0a7'\n```\n\nYou may want to ask, what if no hash? Briefly, hash can:\n\n1.  Make the shared key's length fixed;\n2.  Make it safer since hash functions can remove \"weak bits\" in the original computed key. Check the introduction section of this [paper](http://cacr.uwaterloo.ca/techreports/1998/corr98-05.pdf) for more details.\n\n> Warning: Accoring to some recent research, although widely used, the `sha256` key derivation function is [not secure enough](https://github.com/ecies/py/issues/82).\n\n### AES\n\nNow we have the shared key, and we can use the `nonce` and `tag` to decrypt. This is quite straight, and the example derives from `pycryptodome`'s [documentation](https://pycryptodome.readthedocs.io/en/latest/src/examples.html#encrypt-data-with-aes).\n\n```python\n>>> from Cryptodome.Cipher import AES\n>>> key = b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00'\n>>> iv = b'\\xf3\\xe1\\xba\\x81\\r,\\x89\\x00\\xb1\\x13\\x12\\xb7\\xc7%V_'\n>>> tag = b'\\xec;q\\xe1|\\x11\\xdb\\xe3\\x14\\x84\\xda\\x94P\\xed\\xcfl'\n>>> data = b'\\x02\\xd2\\xff\\xed\\x93\\xb8V\\xf1H\\xb9'\n>>> decipher = AES.new(key, AES.MODE_GCM, nonce=iv)\n>>> decipher.decrypt_and_verify(data, tag)\nb'helloworld'\n```\n\n> Strictly speaking, `nonce` != `iv`, but this is a little bit off topic, if you are curious, you can check [the comment in `utils.py`](https://github.com/ecies/py/blob/master/ecies/utils.py#L223).\n\n## Release Notes\n\n### 0.3.0\n\n-   API change: use `HKDF` to derive shared keys instead of `sha256`\n\n### 0.2.0\n\n-   API change: `ecies.encrypt` and `ecies.decrypt` now can take both hex str and raw bytes\n-   Bump dependency versions\n-   Update documentation\n\n### 0.1.1 ~ 0.1.9\n\n-   Bump dependency versions\n-   Update documentation\n-   Switch to Circle CI\n-   Change license to MIT\n\n### 0.1.0\n\n-   First beta version release\n\n\n",
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