爬虫的 base64 解密问题

2018-07-16 17:54:30 +08:00
 bestehen

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
http://vip.qimingpian.com/#/finos/investment/ireport 企名片里面创投 报告里面 ajax 加载的数据，但是是 base64 加密，但是 base64 解密总是失败

2905 次点击
所在节点    Python
30 条回复
CEBBCAT
2018-07-16 18:30:53 +08:00
确定是 base64 吗？会不会有字符串截取偏移值或者非标准算法？
bestehen
2018-07-16 18:46:53 +08:00
@CEBBCAT 可能在网页里面
crab
2018-07-16 18:47:36 +08:00
也有可能是密文后的 base64
ThirdFlame
2018-07-16 18:50:52 +08:00
不是可见字符。base64 其实不是加密，只是编码。 3 个字节编码为 4 个字节， 解码 4 个字节解码为 3 个字节。
nu11001
2018-07-16 18:57:18 +08:00
明显是加密后的数据，本来想帮你看来自，然而并不想注册
airdge
2018-07-16 19:23:31 +08:00
应该不是 btoa
airdge
2018-07-16 20:24:19 +08:00
算法位于:http://vip.qimingpian.com/static/js/app.7b6630a6e4c6f54565dd.js
解密函数
function n(t) {
return JSON.parse(a("5e5062e82f15fe4ca9d24bc561080e0e", atob(t), 0, 0, "012345677890123", 1))
}
相关函数在这个 js 里面
解密结果为 object
Object { items=[40], total="110354"}
zhaogaz
2018-07-16 22:33:49 +08:00
@airdge 能讲讲怎么做到的么？想学学看。
bestehen
2018-07-16 23:25:10 +08:00
@airdge 我知道在这个里面，但是要 debug 调试
bestehen
2018-07-16 23:25:32 +08:00
@nu11001 你这方面经验很多吗？
bestehen
2018-07-16 23:26:09 +08:00
@ThirdFlame 我知道不是加密，是一种摘要算法
eluotao
2018-07-16 23:42:59 +08:00
@zhaogaz 大神 我有个测试 采集问题
bestehen
2018-07-16 23:45:47 +08:00
@airdge 能否加个 qq 认识一下
whoami9894
2018-07-16 23:46:31 +08:00
@bestehen

人家都告诉你 3bytes=>4bytes 了，还摘要算法……
bestehen
2018-07-16 23:58:44 +08:00
@whoami9894 sorry 记错了，是 md5
bestehen
2018-07-17 00:11:28 +08:00
@airdge 我的数据明明是汉字，你这结果怎么是数字，没明白什么意思
bestehen
2018-07-17 00:25:26 +08:00
@airdge 还有就是你这个函数好像和 data1 没啥关系啊
carlclone
2018-07-17 04:50:57 +08:00
base64 是编码，能连续说错我觉得你还是别搞这些了
wenzhoou
2018-07-17 07:59:29 +08:00
这就是上课说听懂了，然后考试考零分的选手。
airdge
2018-07-17 10:08:08 +08:00
function a(t, e, i, a, n, o) {
var l, c, r, d, h, u, p, v, m, f, g, _, b, y,
w = new Array(16843776, 0, 65536, 16843780, 16842756, 66564, 4, 65536, 1024, 16843776, 16843780, 1024, 16778244, 16842756, 16777216, 4, 1028, 16778240, 16778240, 66560, 66560, 16842752, 16842752, 16778244, 65540, 16777220, 16777220, 65540, 0, 1028, 66564, 16777216, 65536, 16843780, 4, 16842752, 16843776, 16777216, 16777216, 1024, 16842756, 65536, 66560, 16777220, 1024, 4, 16778244, 66564, 16843780, 65540, 16842752, 16778244, 16777220, 1028, 66564, 16843776, 1028, 16778240, 16778240, 0, 65540, 66560, 0, 16842756),
C = new Array(-2146402272, -2147450880, 32768, 1081376, 1048576, 32, -2146435040, -2147450848, -2147483616, -2146402272, -2146402304, -2147483648, -2147450880, 1048576, 32, -2146435040, 1081344, 1048608, -2147450848, 0, -2147483648, 32768, 1081376, -2146435072, 1048608, -2147483616, 0, 1081344, 32800, -2146402304, -2146435072, 32800, 0, 1081376, -2146435040, 1048576, -2147450848, -2146435072, -2146402304, 32768, -2146435072, -2147450880, 32, -2146402272, 1081376, 32, 32768, -2147483648, 32800, -2146402304, 1048576, -2147483616, 1048608, -2147450848, -2147483616, 1048608, 1081344, 0, -2147450880, 32800, -2147483648, -2146435040, -2146402272, 1081344),
x = new Array(520, 134349312, 0, 134348808, 134218240, 0, 131592, 134218240, 131080, 134217736, 134217736, 131072, 134349320, 131080, 134348800, 520, 134217728, 8, 134349312, 512, 131584, 134348800, 134348808, 131592, 134218248, 131584, 131072, 134218248, 8, 134349320, 512, 134217728, 134349312, 134217728, 131080, 520, 131072, 134349312, 134218240, 0, 512, 131080, 134349320, 134218240, 134217736, 512, 0, 134348808, 134218248, 131072, 134217728, 134349320, 8, 131592, 131584, 134217736, 134348800, 134218248, 520, 134348800, 131592, 8, 134348808, 131584),
k = new Array(8396801, 8321, 8321, 128, 8396928, 8388737, 8388609, 8193, 0, 8396800, 8396800, 8396929, 129, 0, 8388736, 8388609, 1, 8192, 8388608, 8396801, 128, 8388608, 8193, 8320, 8388737, 1, 8320, 8388736, 8192, 8396928, 8396929, 129, 8388736, 8388609, 8396800, 8396929, 129, 0, 0, 8396800, 8320, 8388736, 8388737, 1, 8396801, 8321, 8321, 128, 8396929, 129, 1, 8192, 8388609, 8193, 8396928, 8388737, 8193, 8320, 8388608, 8396801, 128, 8388608, 8192, 8396928),
S = new Array(256, 34078976, 34078720, 1107296512, 524288, 256, 1073741824, 34078720, 1074266368, 524288, 33554688, 1074266368, 1107296512, 1107820544, 524544, 1073741824, 33554432, 1074266112, 1074266112, 0, 1073742080, 1107820800, 1107820800, 33554688, 1107820544, 1073742080, 0, 1107296256, 34078976, 33554432, 1107296256, 524544, 524288, 1107296512, 256, 33554432, 1073741824, 34078720, 1107296512, 1074266368, 33554688, 1073741824, 1107820544, 34078976, 1074266368, 256, 33554432, 1107820544, 1107820800, 524544, 1107296256, 1107820800, 34078720, 0, 1074266112, 1107296256, 524544, 33554688, 1073742080, 524288, 0, 1074266112, 34078976, 1073742080),
$ = new Array(536870928, 541065216, 16384, 541081616, 541065216, 16, 541081616, 4194304, 536887296, 4210704, 4194304, 536870928, 4194320, 536887296, 536870912, 16400, 0, 4194320, 536887312, 16384, 4210688, 536887312, 16, 541065232, 541065232, 0, 4210704, 541081600, 16400, 4210688, 541081600, 536870912, 536887296, 16, 541065232, 4210688, 541081616, 4194304, 16400, 536870928, 4194304, 536887296, 536870912, 16400, 536870928, 541081616, 4210688, 541065216, 4210704, 541081600, 0, 541065232, 16, 16384, 541065216, 4210704, 16384, 4194320, 536887312, 0, 541081600, 536870912, 4194320, 536887312),
z = new Array(2097152, 69206018, 67110914, 0, 2048, 67110914, 2099202, 69208064, 69208066, 2097152, 0, 67108866, 2, 67108864, 69206018, 2050, 67110912, 2099202, 2097154, 67110912, 67108866, 69206016, 69208064, 2097154, 69206016, 2048, 2050, 69208066, 2099200, 2, 67108864, 2099200, 67108864, 2099200, 2097152, 67110914, 67110914, 69206018, 69206018, 2, 2097154, 67108864, 67110912, 2097152, 69208064, 2050, 2099202, 69208064, 2050, 67108866, 69208066, 69206016, 2099200, 0, 2, 69208066, 0, 2099202, 69206016, 2048, 67108866, 67110912, 2048, 2097154),
A = new Array(268439616, 4096, 262144, 268701760, 268435456, 268439616, 64, 268435456, 262208, 268697600, 268701760, 266240, 268701696, 266304, 4096, 64, 268697600, 268435520, 268439552, 4160, 266240, 262208, 268697664, 268701696, 4160, 0, 0, 268697664, 268435520, 268439552, 266304, 262144, 266304, 262144, 268701696, 4096, 64, 268697664, 4096, 266304, 268439552, 64, 268435520, 268697600, 268697664, 268435456, 262144, 268439616, 0, 268701760, 262208, 268435520, 268697600, 268439552, 268439616, 0, 268701760, 266240, 266240, 4160, 4160, 262208, 268435456, 268701696),
I = s(t),
L = 0,
D = e.length,
T = 0,
P = 32 == I.length ? 3 : 9;
v = 3 == P ? i ? new Array(0, 32, 2) : new Array(30, -2, -2) : i ? new Array(0, 32, 2, 62, 30, -2, 64, 96, 2) : new Array(94, 62, -2, 32, 64, 2, 30, -2, -2), 2 == o ? e += " " : 1 == o ? i && (r = 8 - D % 8, e += String.fromCharCode(r, r, r, r, r, r, r, r), 8 === r && (D += 8)) : o || (e += "\0\0\0\0\0\0\0\0");
var N = "",
M = "";
for (1 == a && (m = n.charCodeAt(L++) << 24 | n.charCodeAt(L++) << 16 | n.charCodeAt(L++) << 8 | n.charCodeAt(L++), g = n.charCodeAt(L++) << 24 | n.charCodeAt(L++) << 16 | n.charCodeAt(L++) << 8 | n.charCodeAt(L++), L = 0); L<D;) {
for (u = e.charCodeAt(L++) << 24 | e.charCodeAt(L++) << 16 | e.charCodeAt(L++) << 8 | e.charCodeAt(L++), p = e.charCodeAt(L++) << 24 | e.charCodeAt(L++) << 16 | e.charCodeAt(L++) << 8 | e.charCodeAt(L++), 1 == a && (i ? (u ^= m, p ^= g) : (f = m, _ = g, m = u, g = p)), r = 252645135 & (u >>> 4 ^ p), p ^= r, u ^= r << 4, r = 65535 & (u >>> 16 ^ p), p ^= r, u ^= r << 16, r = 858993459 & (p >>> 2 ^ u), u ^= r, p ^= r << 2, r = 16711935 & (p >>> 8 ^ u), u ^= r, p ^= r << 8, r = 1431655765 & (u >>> 1 ^ p), p ^= r, u ^= r << 1, u = u << 1 | u >>> 31, p = p << 1 | p >>> 31, c = 0; c<P; c += 3) {
for (b = v[c + 1], y = v[c + 2], l = v[c]; l != b; l += y) d = p ^ I[l], h = (p >>> 4 | p << 28) ^ I[l + 1], r = u, u = p, p = r ^ (C[d >>> 24 & 63] | k[d >>> 16 & 63] | $[d >>> 8 & 63] | A[63 & d] | w[h >>> 24 & 63] | x[h >>> 16 & 63] | S[h >>> 8 & 63] | z[63 & h]);
r = u, u = p, p = r
}
u = u >>> 1 | u << 31, p = p >>> 1 | p << 31, r = 1431655765 & (u >>> 1 ^ p), p ^= r, u ^= r << 1, r = 16711935 & (p >>> 8 ^ u), u ^= r, p ^= r << 8, r = 858993459 & (p >>> 2 ^ u), u ^= r, p ^= r << 2, r = 65535 & (u >>> 16 ^ p), p ^= r, u ^= r << 16, r = 252645135 & (u >>> 4 ^ p), p ^= r, u ^= r << 4, 1 == a && (i ? (m = u, g = p) : (u ^= f, p ^= _)), M += String.fromCharCode(u >>> 24, u >>> 16 & 255, u >>> 8 & 255, 255 & u, p >>> 24, p >>> 16 & 255, p >>> 8 & 255, 255 & p), T += 8, 512 == T && (N += M, M = "", T = 0)
}
if (N += M, N = N.replace(/\0*$/g, ""), !i) {
if (1 === o) {
var D = N.length,
j = 0;
D && (j = N.charCodeAt(D - 1)), j<=8 && (N = N.substring(0, D - j))
}
N = decodeURIComponent(escape(N))
}
return N
}

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