B站 av和bv号互转 py和js版 bigint

参考

https://www.zhihu.com/question/381784377/answer/1099438784

py的可以直接使用

table='fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF'
tr={}
for i in range(58):
	tr[table[i]]=i s=[11,10,3,8,4,6] xor=177451812 add=8728348608 def dec(x): r=0 for i in range(6): r+=tr[x[s[i]]]*58**i return (r-add)^xor def enc(x): x=(x^xor)+add r=list('BV1 4 1 7 ') for i in range(6): r[s[i]]=table[x//58**i%58] return ''.join(r) print(dec('BV17x411w7KC')) # 170001 print(dec('BV1Q541167Qg')) # 455017605 print(dec('BV1mK4y1C7Bz')) # 882584971 print(enc(170001)) # BV17x411w7KC print(enc(455017605)) # BV1Q541167Qg print(enc(882584971)) # BV1mK4y1C7Bz

js版的需要做一些修改, 主要是使用bigint做计算, 因为其中涉及的数值计算太大了, 普通的会溢出

const table = 'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF'

const tr = table.split('').reduce(
  (pre, v, i) => { pre[table[i]] = BigInt(i) return pre }, [] ) let s = [11, 10, 3, 8, 4, 6].map(i => BigInt(i)) let xor = BigInt(177451812); let add = BigInt(8728348608) const NUM_58 = BigInt(58) function dec(x) { let r = BigInt(0); for (let i = 0; i < 6; i++) { r += tr[x[s[i]]] * NUM_58 ** BigInt(i); } let res = (r - add) ^ xor return res.toString(); } function enc(x) { x = BigInt(x) x = (x ^ xor) + add let r = 'BV1 4 1 7 '.split('') for (let i = 0; i < 6; i++) { r[s[i]] = table [x / NUM_58 ** BigInt(i) % NUM_58] } return r.join('') } console.log(dec('BV17x411w7KC')) // 170001 console.log(dec('BV1Q541167Qg')) // 455017605 console.log(dec('BV1mK4y1C7Bz')) // 882584971 console.log(enc(170001)) // BV17x411w7KC console.log(enc(455017605)) // BV1Q541167Qg console.log(enc(882584971)) // BV1mK4y1C7Bz console.log(enc(498566183)) // BV1AK411W7wq console.log(dec('BV1Ft4y197pr')) // 626046351 

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