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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>PHP Secure Communications Library</title><link rel="stylesheet" href="docbook.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /><meta name="description" content="The PHP Secure Communications Library contains LGPL-licensed pure-PHP implementations of arbitrary-precision integers, fully PKCS#1 (v2.1) compliant RSA, DES, 3DES, RC4, Rijndael, AES, SSH-1, SSH-2, and SFTP. This book discusses how to use them." /><link rel="start" href="index.html" title="PHP Secure Communications Library" /><link rel="next" href="intro.html" title="Chapter 1. Introduction" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">PHP <span class="red">Secure</span> Communications Library</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="intro.html">Next</a></td></tr></table><hr /></div><div class="book" lang="en" xml:lang="en"><div class="titlepage"><div><div><h1 class="title"><a id="id440772"></a>PHP <span class="red">Secure</span> Communications Library</h1></div><div><div class="author"><h3 class="author"><span class="firstname">Jim</span> <span class="othername">TerraFrost</span> <span class="surname">Wigginton</span></h3></div></div><div><p class="copyright">Copyright © 2007 - 2010 TerraFrost (Jim Wigginton)</p></div><div><div class="abstract"><p class="title"><b>Abstract</b></p><p>
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The PHP Secure Communications Library contains LGPL-licensed pure-PHP implementations of arbitrary-precision integers,
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fully PKCS#1 (v2.1) compliant RSA, DES, 3DES, RC4, Rijndael, AES, SSH-1, SSH-2, and SFTP. This book discusses how to use them.</p></div></div></div><hr /></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="chapter"><a href="intro.html">1. Introduction</a></span></dt><dd><dl><dt><span class="section"><a href="intro.html#intro_intro">1.1. Who should use phpseclib</a></span></dt><dt><span class="section"><a href="intro.html#intro_usage">1.2. Using phpseclib</a></span></dt></dl></dd><dt><span class="chapter"><a href="math.html">2. Math</a></span></dt><dd><dl><dt><span class="section"><a href="math.html#math_biginteger">2.1. Math_BigInteger</a></span></dt><dd><dl><dt><span class="section"><a href="math.html#math_biginteger_dependencies">2.1.1. Dependencies</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_constructor">2.1.2. The constructor</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_output">2.1.3. toString(), toBytes(), toHex() and toBits()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_fourfunctions">2.1.4. add(), subtract(), multiply() and divide()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_modulo">2.1.5. powMod() and modInverse()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_gcd">2.1.6. gcd() and extendedGCD()</a></span></dt><dt><span class="section"><a href="math.html#math_abs">2.1.7. abs()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_compare">2.1.8. equals() and compare()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_precision">2.1.9. setPrecision()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_bitwise">2.1.10. bitwise_and(), bitwise_or(), bitwise_xor() and bitwise_not()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_shifts">2.1.11. bitwise_rightShift() and bitwise_leftShift()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_rotates">2.1.12. bitwise_rightRotate() and bitwise_leftRotate()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_setrandom">2.1.13. setRandomGenerator()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_prime">2.1.14. isPrime()</a></span></dt><dt><span class="section"><a href="math.html#math_biginteger_random">2.1.15. random() and randomPrime()</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="sym_crypt.html">3. Symmetric-key Cryptography</a></span></dt><dd><dl><dt><span class="section"><a href="sym_crypt.html#sym_crypt_intro">3.1. Introduction</a></span></dt><dd><dl><dt><span class="section"><a href="sym_crypt.html#sym_crypt_dependencies">3.1.1. Dependencies</a></span></dt><dt><span class="section"><a href="sym_crypt.html#sym_crypt_set">3.1.2. setKey() and setIV()</a></span></dt><dt><span class="section"><a href="sym_crypt.html#sym_crypt_encrypt">3.1.3. encrypt() and decrypt()</a></span></dt><dt><span class="section"><a href="sym_crypt.html#sym_crypt_continuousbuffer">3.1.4. enableContinuousBuffer() and disableContinuousBuffer()</a></span></dt><dt><span class="section"><a href="sym_crypt.html#sym_crypt_padding">3.1.5. enablePadding() and disablePadding()</a></span></dt><dt><span class="section"><a href="sym_crypt.html#sym_crypt_caution">3.1.6. A word of caution about stream ciphers and CTR mode</a></span></dt></dl></dd><dt><span class="section"><a href="sym_crypt.html#sym_crypt_des">3.2. Crypt_DES</a></span></dt><dd><dl><dt><span class="section"><a href="sym_crypt.html#sym_crypt_des_constructor">3.2.1. The constructor</a></span></dt></dl></dd><dt><span class="section"><a href="sym_crypt.html#sym_crypt_tripledes">3.3. Crypt_TripleDES</a></span></dt><dd><dl><dt><span class="section"><a href="sym_crypt.html#sym_crypt_tripledes_constructor">3.3.1. The constructor</a></span></dt></dl></dd><dt><span class="section"><a href="sym_crypt.html#sym_crypt_rc4">3.4. Crypt_RC4</a></span></dt><dd><dl><dt><span
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