mirror of
https://github.com/koreader/koreader
synced 2024-10-31 21:20:20 +00:00
709755cd9e
I don't know if it's a bug in luajit but on an x86_64 CPU:
```lua
> = ffi.cast("uint32_t", 0xFFFFFFFFE) + 0
4294967294LL
```
while on an ARM CPU:
```lua
> = ffi.cast("uint32_t", 0xFFFFFFFFE) + 0
4294967295LL
```
234 lines
6.9 KiB
Lua
234 lines
6.9 KiB
Lua
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local ffi = require "ffi"
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local bit = require "bit"
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local bxor = bit.bxor
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local bnot = bit.bnot
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local band = bit.band
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local bor = bit.bor
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local rshift = bit.rshift
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local lshift = bit.lshift
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require "memutils"
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require "stringzutils"
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ffi.cdef[[
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typedef struct MD5Context {
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uint32_t buf[4];
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uint32_t bits[2];
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unsigned char input[64];
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} MD5_CTX;
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]]
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MD5_CTX = ffi.typeof("MD5_CTX");
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function byteReverse(buf, len)
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end
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function F1(x, y, z) return bxor(z, band(x, bxor(y, z))) end
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function F2(x, y, z) return F1(z, x, y) end
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function F3(x, y, z) return bxor(x, y, z) end
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function F4(x, y, z) return bxor(y, bor(x, bnot(z))) end
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function MD5STEP(f, w, x, y, z, data, s)
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w = w + f(x, y, z) + data;
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w = bor(lshift(w,s), rshift(w,(32-s)))
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w = w + x;
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return w;
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end
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function printmd5ctx(ctx)
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for i=0,3 do
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print(string.format("ctx.buf[%d]: 0x%x", i, ctx.buf[i]));
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end
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print(string.format("ctx.bits[0]: %d", ctx.bits[0]));
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print(string.format("ctx.bits[1]: %d", ctx.bits[1]));
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end
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-- Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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-- initialization constants.
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function MD5Init(ctx)
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ctx.buf[0] = 0x67452301;
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ctx.buf[1] = 0xefcdab89;
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ctx.buf[2] = 0x98badcfe;
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ctx.buf[3] = 0x10325476;
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ctx.bits[0] = 0;
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ctx.bits[1] = 0;
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end
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function MD5Transform(buf, input)
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local a = buf[0];
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local b = buf[1];
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local c = buf[2];
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local d = buf[3];
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a = MD5STEP(F1, a, b, c, d, input[0] + 0xd76aa478, 7);
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d = MD5STEP(F1, d, a, b, c, input[1] + 0xe8c7b756, 12);
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c = MD5STEP(F1, c, d, a, b, input[2] + 0x242070db, 17);
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b = MD5STEP(F1, b, c, d, a, input[3] + 0xc1bdceee, 22);
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a = MD5STEP(F1, a, b, c, d, input[4] + 0xf57c0faf, 7);
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d = MD5STEP(F1, d, a, b, c, input[5] + 0x4787c62a, 12);
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c = MD5STEP(F1, c, d, a, b, input[6] + 0xa8304613, 17);
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b = MD5STEP(F1, b, c, d, a, input[7] + 0xfd469501, 22);
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a = MD5STEP(F1, a, b, c, d, input[8] + 0x698098d8, 7);
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d = MD5STEP(F1, d, a, b, c, input[9] + 0x8b44f7af, 12);
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c = MD5STEP(F1, c, d, a, b, input[10] + 0xffff5bb1, 17);
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b = MD5STEP(F1, b, c, d, a, input[11] + 0x895cd7be, 22);
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a = MD5STEP(F1, a, b, c, d, input[12] + 0x6b901122, 7);
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d = MD5STEP(F1, d, a, b, c, input[13] + 0xfd987193, 12);
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c = MD5STEP(F1, c, d, a, b, input[14] + 0xa679438e, 17);
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b = MD5STEP(F1, b, c, d, a, input[15] + 0x49b40821, 22);
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a = MD5STEP(F2, a, b, c, d, input[1] + 0xf61e2562, 5);
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d = MD5STEP(F2, d, a, b, c, input[6] + 0xc040b340, 9);
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c = MD5STEP(F2, c, d, a, b, input[11] + 0x265e5a51, 14);
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b = MD5STEP(F2, b, c, d, a, input[0] + 0xe9b6c7aa, 20);
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a = MD5STEP(F2, a, b, c, d, input[5] + 0xd62f105d, 5);
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d = MD5STEP(F2, d, a, b, c, input[10] + 0x02441453, 9);
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c = MD5STEP(F2, c, d, a, b, input[15] + 0xd8a1e681, 14);
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b = MD5STEP(F2, b, c, d, a, input[4] + 0xe7d3fbc8, 20);
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a = MD5STEP(F2, a, b, c, d, input[9] + 0x21e1cde6, 5);
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d = MD5STEP(F2, d, a, b, c, input[14] + 0xc33707d6, 9);
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c = MD5STEP(F2, c, d, a, b, input[3] + 0xf4d50d87, 14);
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b = MD5STEP(F2, b, c, d, a, input[8] + 0x455a14ed, 20);
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a = MD5STEP(F2, a, b, c, d, input[13] + 0xa9e3e905, 5);
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d = MD5STEP(F2, d, a, b, c, input[2] + 0xfcefa3f8, 9);
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c = MD5STEP(F2, c, d, a, b, input[7] + 0x676f02d9, 14);
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b = MD5STEP(F2, b, c, d, a, input[12] + 0x8d2a4c8a, 20);
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a = MD5STEP(F3, a, b, c, d, input[5] + 0xfffa3942, 4);
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d = MD5STEP(F3, d, a, b, c, input[8] + 0x8771f681, 11);
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c = MD5STEP(F3, c, d, a, b, input[11] + 0x6d9d6122, 16);
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b = MD5STEP(F3, b, c, d, a, input[14] + 0xfde5380c, 23);
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a = MD5STEP(F3, a, b, c, d, input[1] + 0xa4beea44, 4);
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d = MD5STEP(F3, d, a, b, c, input[4] + 0x4bdecfa9, 11);
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c = MD5STEP(F3, c, d, a, b, input[7] + 0xf6bb4b60, 16);
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b = MD5STEP(F3, b, c, d, a, input[10] + 0xbebfbc70, 23);
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a = MD5STEP(F3, a, b, c, d, input[13] + 0x289b7ec6, 4);
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d = MD5STEP(F3, d, a, b, c, input[0] + 0xeaa127fa, 11);
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c = MD5STEP(F3, c, d, a, b, input[3] + 0xd4ef3085, 16);
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b = MD5STEP(F3, b, c, d, a, input[6] + 0x04881d05, 23);
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a = MD5STEP(F3, a, b, c, d, input[9] + 0xd9d4d039, 4);
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d = MD5STEP(F3, d, a, b, c, input[12] + 0xe6db99e5, 11);
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c = MD5STEP(F3, c, d, a, b, input[15] + 0x1fa27cf8, 16);
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b = MD5STEP(F3, b, c, d, a, input[2] + 0xc4ac5665, 23);
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a = MD5STEP(F4, a, b, c, d, input[0] + 0xf4292244, 6);
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d = MD5STEP(F4, d, a, b, c, input[7] + 0x432aff97, 10);
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c = MD5STEP(F4, c, d, a, b, input[14] + 0xab9423a7, 15);
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b = MD5STEP(F4, b, c, d, a, input[5] + 0xfc93a039, 21);
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a = MD5STEP(F4, a, b, c, d, input[12] + 0x655b59c3, 6);
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d = MD5STEP(F4, d, a, b, c, input[3] + 0x8f0ccc92, 10);
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c = MD5STEP(F4, c, d, a, b, input[10] + 0xffeff47d, 15);
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b = MD5STEP(F4, b, c, d, a, input[1] + 0x85845dd1, 21);
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a = MD5STEP(F4, a, b, c, d, input[8] + 0x6fa87e4f, 6);
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d = MD5STEP(F4, d, a, b, c, input[15] + 0xfe2ce6e0, 10);
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c = MD5STEP(F4, c, d, a, b, input[6] + 0xa3014314, 15);
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b = MD5STEP(F4, b, c, d, a, input[13] + 0x4e0811a1, 21);
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a = MD5STEP(F4, a, b, c, d, input[4] + 0xf7537e82, 6);
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d = MD5STEP(F4, d, a, b, c, input[11] + 0xbd3af235, 10);
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c = MD5STEP(F4, c, d, a, b, input[2] + 0x2ad7d2bb, 15);
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b = MD5STEP(F4, b, c, d, a, input[9] + 0xeb86d391, 21);
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buf[0] = band(buf[0] + a, 0xFFFFFFFF);
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buf[1] = band(buf[1] + b, 0xFFFFFFFF);
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buf[2] = band(buf[2] + c, 0xFFFFFFFF);
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buf[3] = band(buf[3] + d, 0xFFFFFFFF);
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end
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function MD5Update(ctx, buf, len)
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local t;
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t = ctx.bits[0];
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ctx.bits[0] = t + lshift( len, 3)
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if (ctx.bits[0] < t) then
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ctx.bits[1] = ctx.bits[1] + 1;
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end
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ctx.bits[1] = ctx.bits[1] + rshift(len, 29);
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t = band(rshift(t, 3), 0x3f);
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if (t > 0) then
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p = ffi.cast("unsigned char *", ctx.input + t);
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t = 64 - t;
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if (len < t) then
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memcpy(p, buf, len);
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return;
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end
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memcpy(p, buf, t);
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byteReverse(ctx.input, 16);
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MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input));
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buf = buf + t;
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len = len - t;
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end
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while (len >= 64) do
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memcpy(ctx.input, buf, 64);
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byteReverse(ctx.input, 16);
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MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input));
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buf = buf + 64;
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len = len - 64;
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end
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memcpy(ctx.input, buf, len);
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end
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function MD5Final(digest, ctx)
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local count;
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local p;
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count = band(rshift(ctx.bits[0], 3), 0x3F);
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p = ctx.input + count;
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p[0] = 0x80;
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p = p + 1;
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count = 64 - 1 - count;
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if (count < 8) then
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memset(p, 0, count);
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byteReverse(ctx.input, 16);
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MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input));
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memset(ctx.input, 0, 56);
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else
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memset(p, 0, count - 8);
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end
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byteReverse(ctx.input, 14);
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ffi.cast("uint32_t *", ctx.input)[14] = ctx.bits[0];
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ffi.cast("uint32_t *", ctx.input)[15] = ctx.bits[1];
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MD5Transform(ctx.buf, ffi.cast("uint32_t *", ctx.input));
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byteReverse(ffi.cast("unsigned char *",ctx.buf), 4);
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memcpy(digest, ctx.buf, 16);
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memset(ffi.cast("char *", ctx), 0, ffi.sizeof(ctx));
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end
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function md5(luastr)
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local buf = ffi.new("char[33]");
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local hash = ffi.new("uint8_t[16]");
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local len = #luastr
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local p = ffi.cast("const char *", luastr);
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local ctx = MD5_CTX();
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MD5Init(ctx);
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MD5Update(ctx, p, len);
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MD5Final(hash, ctx);
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bin2str(buf, hash, ffi.sizeof(hash));
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return ffi.string(buf);
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end
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