十六进制字符串(hexString)转base64
@TOC
背景
sm-crypto中的sm3加密数据时，sm3方法返回的是hexString，但是后端需要接收的是base64。使用浏览器自带的btoa(str):base64，转base64后，获取的结果是不对的（可以配合后端sm3加密测验，会发现btoa(str)转的base64和后端的不匹配）。所需需要封装一个适用hexString十六进制字符串转base64的方法。
hexString十六进制字符串转base64
/* eslint-disable no-sequences */
/* eslint-disable no-bitwise */
/* eslint-disable eqeqeq */
/* eslint-disable no-cond-assign */
/* eslint-disable no-unused-expressions */
/* eslint-disable no-array-constructor */
const base64EncodeChars =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
const base64encode = function (e: any) {
let r
let a
let c
let h
let o
let t
for (c = e.length, a = 0, r = ''; a < c; ) {
if (((h = 255 & e.charCodeAt(a++)), a == c)) {
;(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt((3 & h) << 4)),
(r += '==')
break
}
if (((o = e.charCodeAt(a++)), a == c)) {
;(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt(((3 & h) << 4) | ((240 & o) >> 4))),
(r += base64EncodeChars.charAt((15 & o) << 2)),
(r += '=')
break
}
;(t = e.charCodeAt(a++)),
(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt(((3 & h) << 4) | ((240 & o) >> 4))),
(r += base64EncodeChars.charAt(((15 & o) << 2) | ((192 & t) >> 6))),
(r += base64EncodeChars.charAt(63 & t))
}
return r
}
/**
*
16进制转base64
*/
export const hexToBase64 = function (str: any) {
return base64encode(
String.fromCharCode.apply(
null,
str
.replace(/\r|\n/g, '')
.replace(/([\da-fA-F]{2}) ?/g, '0x$1 ')
.replace(/ +$/, '')
.split(' ')
)
)
}
其他base64、hexString、string互转的代码
/* eslint-disable no-sequences */
/* eslint-disable no-bitwise */
/* eslint-disable eqeqeq */
/* eslint-disable no-cond-assign */
/* eslint-disable no-unused-expressions */
/* eslint-disable no-array-constructor */
const base64EncodeChars =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
const base64encode = function (e: any) {
let r
let a
let c
let h
let o
let t
for (c = e.length, a = 0, r = ''; a < c; ) {
if (((h = 255 & e.charCodeAt(a++)), a == c)) {
;(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt((3 & h) << 4)),
(r += '==')
break
}
if (((o = e.charCodeAt(a++)), a == c)) {
;(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt(((3 & h) << 4) | ((240 & o) >> 4))),
(r += base64EncodeChars.charAt((15 & o) << 2)),
(r += '=')
break
}
;(t = e.charCodeAt(a++)),
(r += base64EncodeChars.charAt(h >> 2)),
(r += base64EncodeChars.charAt(((3 & h) << 4) | ((240 & o) >> 4))),
(r += base64EncodeChars.charAt(((15 & o) << 2) | ((192 & t) >> 6))),
(r += base64EncodeChars.charAt(63 & t))
}
return r
}
/**
*
16进制转base64
*/
export const hexToBase64 = function (str: any) {
return base64encode(
String.fromCharCode.apply(
null,
str
.replace(/\r|\n/g, '')
.replace(/([\da-fA-F]{2}) ?/g, '0x$1 ')
.replace(/ +$/, '')
.split(' ')
)
)
}
/**
* base64转为16进制
*/
export function base64ToHex(base64: string): string {
const raw = atob(base64)
let HEX = ''
// eslint-disable-next-line no-plusplus
for (let i = 0; i < raw.length; i++) {
// eslint-disable-next-line no-underscore-dangle
const _hex = raw.charCodeAt(i).toString(16)
HEX += _hex.length === 2 ? _hex : `0${_hex}`
}
return HEX.toUpperCase()
}
/**
* 随机生成16位字符串
*/
export function createNonceStr(): string {
const chars = [
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'I',
'J',
'K',
'L',
'M',
'N',
'O',
'P',
'Q',
'R',
'S',
'T',
'U',
'V',
'W',
'X',
'Y',
'Z',
'a',
'b',
'c',
'd',
'e',
'f',
'g',
'h',
'i',
'j',
'k',
'l',
'm',
'n',
'o',
'p',
'q',
'r',
's',
't',
'u',
'v',
'w',
'x',
'y',
'z',
]
let nums = ''
// eslint-disable-next-line no-plusplus
for (let i = 0; i < 16; i++) {
// 这里是几位就要在这里不改变
const id = parseInt((Math.random() * 61).toString(), 10)
nums += chars[id]
}
return nums
}
/**
* 字符串转成16进制
*/
export function stringToHex(value: string): string {
let str = ''
// eslint-disable-next-line no-plusplus
for (let i = 0; i < value.length; i++) {
if (value === '') str = value.charCodeAt(i).toString(16)
else str += value.charCodeAt(i).toString(16)
}
return str
}
// 字符串转base64
export function strToBase64(preStr: string) {
const str = encodeURI(preStr)
const base64 = btoa(str)
return base64
}
export function base64ToString(base64: string): string {
return atob(base64)
}
原文地址：https://blog.csdn.net/weixin_44224921/article/details/144364989
免责声明：本站文章内容转载自网络资源，如本站内容侵犯了原著者的合法权益，可联系本站删除。更多内容请关注自学内容网（zxcms.com）！