【JavaScript】纯js,base64字符串加密解密
加密：字符串加密成base64function stringToBase64(str) {
// 将字符串转换为UTF-8字节数组
let utf8 = unescape(encodeURIComponent(str))
// Base64字符集
let chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
// 初始化输出字符串
let out = ''
// 遍历UTF-8字节数组
for (let i = 0; i < utf8.length;) {
let c1 = utf8.charCodeAt(i++) & 0xff
if (i === utf8.length) {
let enc1 = c1 >> 2
let enc2 = (c1 & 0x3) << 4
out += chars.charAt(enc1) + chars.charAt(enc2) + '=='
break
}
let c2 = utf8.charCodeAt(i++)
if (i === utf8.length) {
let enc1 = c1 >> 2
let enc2 = ((c1 & 0x3) << 4) | (c2 >> 4)
let enc3 = (c2 & 0xf) << 2
out += chars.charAt(enc1) + chars.charAt(enc2) + chars.charAt(enc3) + '='
break
}
let c3 = utf8.charCodeAt(i++)
let enc1 = c1 >> 2
let enc2 = ((c1 & 0x3) << 4) | (c2 >> 4)
let enc3 = ((c2 & 0xf) << 2) | (c3 >> 6)
let enc4 = c3 & 0x3f
out += chars.charAt(enc1) + chars.charAt(enc2) + chars.charAt(enc3) + chars.charAt(enc4)
}
return out
}
let ret = stringToBase64("老冷编程学院http://bbs.laoleng.vip")
logd(ret)
//结果6ICB5Ya357yW56iL5a2m6ZmiW3VybD1odHRwOi8vYmJzLmxhb2xlbmcudmlwXWh0dHA6Ly9iYnMubGFvbGVuZy52aXBbL3VybF0=
解密：base64转字符串
function base64ToString(base64) {
let chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
let out = '', i = 0, len = base64.length, c1, c2, c3, c4
while (i < len) {
c1 = chars.indexOf(base64.charAt(i++)) << 2
c2 = chars.indexOf(base64.charAt(i++))
out += String.fromCharCode((c1 | (c2 >> 4)) & 0xFF)
if (i >= len || base64.charAt(i) === '=') break
c3 = chars.indexOf(base64.charAt(i++))
out += String.fromCharCode(((c2 << 4) | (c3 >> 2)) & 0xFF)
if (i >= len || base64.charAt(i) === '=') break
c4 = chars.indexOf(base64.charAt(i++))
out += String.fromCharCode(((c3 << 6) | c4) & 0xFF)
}
// 将UTF-8字节数组转换回字符串
return decodeURIComponent(escape(out))
}
logd(base64ToString("6ICB5Ya357yW56iL5a2m6ZmiW3VybD1odHRwOi8vYmJzLmxhb2xlbmcudmlwXWh0dHA6Ly9iYnMubGFvbGVuZy52aXBbL3VybF0="))
//结果 老冷编程学院http://bbs.laoleng.vip
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