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    "info": {
        "author": "Min Choro",
        "author_email": "blinglnav@gmail.com",
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        "classifiers": [
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.2",
            "Programming Language :: Python :: 3.3",
            "Programming Language :: Python :: 3.4",
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        "description": "# PyPadding\n\n[![Build Status](https://travis-ci.org/blinglnav/pypadding.svg?branch=master)](https://travis-ci.org/blinglnav/pypadding)\n\nThis package implements padding methods to use block crypto function.\n\n## Dependencies\n\n* Python 3+\n\n## Usage\n\n### PKCS#5 / PKCS#7\n* pypadding.pkcs\n* Fill using number of padding number\n* e.g. When block size is 8, b'hello' need 3 bytes to multiple of block size --> fill using `b'\\x03'` (`b'hello\\x03\\x03\\x03'`)\n\n```python\n>>> from pypadding import pkcs\n>>> encoder = pkcs.Encoder()\n>>> encoder.encode(b'hello')\nb'hello\\x03\\x03\\x03'\n>>> encoder.decode(b'hello\\x03\\x03\\x03')\nb'hello'\n```\n\n### ANSI x923\n* pypadding.x923\n* Fill using zero(`b'\\x00'`) and last byte set to length of padding\n* e.g. When block size is 8, b'hello' need 3 bytes to multiple of block size --> fill using `b'\\x00'` and last byte set to `b'\\x03'` (`b'hello\\x00\\x00\\x03'`)\n\n```python\n>>> from pypadding import x923\n>>> encoder = x923.Encoder()\n>>> encoder.encode(b'hello')\nb'hello\\x00\\x00\\x03'\n>>> encoder.decode(b'hello\\x00\\x00\\x03')\nb'hello'\n```\n\n### ISO 10126\n* pypadding.iso10126\n* Fill using random byte and last byte set to length of padding\n* e.g. When block size is 8, b'hello' need 3 bytes to multiple of block size --> fill random byte and last byte set to `b'\\x03'` (`b'hello\\x85\\xaa\\x03'`)\n\n```python\n>>> from pypadding import iso10126\n>>> encoder = iso10126.Encoder()\n>>> encoder.encode(b'hello')\nb'hello\\x85\\xaa\\x03'\n>>> encoder.decode(b'hello\\x85\\xaa\\x03')\nb'hello'\n```\n\n### ISO/IEC 7816-4\n* pypadding.iso7816_4\n* Padding starts with `b'\\x80'` and fill using zero `b'\\x00'`\n* e.g. When block size is 8, b'hello' need 3 bytes to multiple of block size --> fill first byte to `b'\\x80'` then fill to `b'\\x00'` (`b'hello\\x80\\x00\\x00'`)\n\n```python\n>>> from pypadding import iso7816_4\n>>> encoder = iso7816_4.Encoder()\n>>> encoder.encode(b'hello')\nb'hello\\x80\\x00\\x00'\n>>> encoder.decode(b'hello\\x80\\x00\\x00')\nb'hello'\n```\n\n## Set Block Size\n\n```python\n>>> from pypadding import pkcs\n>>> encoder = pkcs.Encoder(16)\n>>> encoder.encode(b'blackjack')\nb'blackjack\\x07\\x07\\x07\\x07\\x07\\x07\\x07'\n>>> encoder.decode(b'blackjack\\x07\\x07\\x07\\x07\\x07\\x07\\x07')\nb'blackjack'\n```\n\nor\n\n```python\n>>> from pypadding import pkcs\n>>> encoder = pkcs.Encoder(block_size=16)\n>>> encoder.encode(b'blackjack')\nb'blackjack\\x07\\x07\\x07\\x07\\x07\\x07\\x07'\n>>> encoder.decode(b'blackjack\\x07\\x07\\x07\\x07\\x07\\x07\\x07')\nb'blackjack'\n```\n\n\n## Note\n* All encoded data has padding even though length of original data is multiple of block size\n    * e.g. block size = 8, encoding w/ pkcs, `encode('computer')` --> `b'computer\\x08\\x08\\x08\\x08\\x08\\x08\\x08\\x08'`\n\n\n## Reference\n* https://en.wikipedia.org/wiki/Padding_(cryptography)\n    * This package implement reversible methods only\n\n\n",
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