本文实例为大家介绍了JavaScript SHA1加密算法吗，供大家参考，具体内容如下

/* * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined * in FIPS 180-1 * Version 2.2 Copyright Paul Johnston 2000 - 2009. * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet * Distributed under the BSD License * See http://pajhome.org.uk/crypt/md5 for details. * http://bination function for the current * iteration */function sha1_ft(t, b, c, d){ if(t < 20) return (b & c) | ((~b) & d); if(t < 40) return b ^ c ^ d; if(t < 60) return (b & c) | (b & d) | (c & d); return b ^ c ^ d;} /* * Determine the appropriate additive constant for the current iteration */function sha1_kt(t){ return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;} /* * Add integers, wrapping at 2^32. This uses 16-bit operations internally * to work around bugs in some JS interpreters. */function safe_add(x, y){ var lsw = (x & 0xFFFF) + (y & 0xFFFF); var msw = (x >> 16) + (y >> 16) + (lsw >> 16); return (msw << 16) | (lsw & 0xFFFF);} /* * Bitwise rotate a 32-bit number to the left. */function bit_rol(num, cnt){ return (num << cnt) | (num >>> (32 - cnt));}

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