| 1 | #include <linux/kernel.h>
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| 2 | #include <linux/module.h>
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| 3 | #include <linux/cryptohash.h>
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| 4 |
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| 5 |
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| 6 | #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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| 7 | #define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z)))
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| 8 | #define H(x, y, z) ((x) ^ (y) ^ (z))
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| 9 |
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| 10 | |
| 11 | * The generic round function. The application is so specific that
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| 12 | * we don't bother protecting all the arguments with parens, as is generally
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| 13 | * good macro practice, in favor of extra legibility.
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| 14 | * Rotation is separate from addition to prevent recomputation
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| 15 |
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| 16 | #define ROUND(f, a, b, c, d, x, s) \
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| 17 | (a += f(b, c, d) + x, a = (a << s) | (a >> (32 - s)))
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| 18 | #define K1 0
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| 19 | #define K2 013240474631UL
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| 20 | #define K3 015666365641UL
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| 21 |
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| 22 | |
| 23 | * Basic cut-down MD4 transform. Returns only 32 bits of result.
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| 24 |
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| 25 | __u32 half_md4_transform(__u32 buf[4], __u32 const in[8])
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| 26 | {
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| 27 | __u32 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
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| 28 |
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| 29 |
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| 30 | ROUND(F, a, b, c, d, in[0] + K1, 3);
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| 31 | ROUND(F, d, a, b, c, in[1] + K1, 7);
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| 32 | ROUND(F, c, d, a, b, in[2] + K1, 11);
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| 33 | ROUND(F, b, c, d, a, in[3] + K1, 19);
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| 34 | ROUND(F, a, b, c, d, in[4] + K1, 3);
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| 35 | ROUND(F, d, a, b, c, in[5] + K1, 7);
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| 36 | ROUND(F, c, d, a, b, in[6] + K1, 11);
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| 37 | ROUND(F, b, c, d, a, in[7] + K1, 19);
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| 38 |
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| 39 |
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| 40 | ROUND(G, a, b, c, d, in[1] + K2, 3);
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| 41 | ROUND(G, d, a, b, c, in[3] + K2, 5);
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| 42 | ROUND(G, c, d, a, b, in[5] + K2, 9);
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| 43 | ROUND(G, b, c, d, a, in[7] + K2, 13);
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| 44 | ROUND(G, a, b, c, d, in[0] + K2, 3);
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| 45 | ROUND(G, d, a, b, c, in[2] + K2, 5);
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| 46 | ROUND(G, c, d, a, b, in[4] + K2, 9);
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| 47 | ROUND(G, b, c, d, a, in[6] + K2, 13);
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| 48 |
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| 49 |
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| 50 | ROUND(H, a, b, c, d, in[3] + K3, 3);
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| 51 | ROUND(H, d, a, b, c, in[7] + K3, 9);
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| 52 | ROUND(H, c, d, a, b, in[2] + K3, 11);
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| 53 | ROUND(H, b, c, d, a, in[6] + K3, 15);
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| 54 | ROUND(H, a, b, c, d, in[1] + K3, 3);
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| 55 | ROUND(H, d, a, b, c, in[5] + K3, 9);
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| 56 | ROUND(H, c, d, a, b, in[0] + K3, 11);
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| 57 | ROUND(H, b, c, d, a, in[4] + K3, 15);
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| 58 |
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| 59 | buf[0] += a;
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| 60 | buf[1] += b;
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| 61 | buf[2] += c;
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| 62 | buf[3] += d;
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| 63 |
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| 64 | return buf[1];
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| 65 | }
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| 66 | EXPORT_SYMBOL(half_md4_transform);
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