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19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/string.h>
23#include <linux/types.h>
24#include <asm/byteorder.h>
25#include "md4.h"
26
27MODULE_LICENSE("GPL");
28
29static inline u32 lshift(u32 x, unsigned int s)
30{
31 x &= 0xFFFFFFFF;
32 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
33}
34
35static inline u32 F(u32 x, u32 y, u32 z)
36{
37 return (x & y) | ((~x) & z);
38}
39
40static inline u32 G(u32 x, u32 y, u32 z)
41{
42 return (x & y) | (x & z) | (y & z);
43}
44
45static inline u32 H(u32 x, u32 y, u32 z)
46{
47 return x ^ y ^ z;
48}
49
50#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
51#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
52#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
53
54static void md4_transform(u32 *hash, u32 const *in)
55{
56 u32 a, b, c, d;
57
58 a = hash[0];
59 b = hash[1];
60 c = hash[2];
61 d = hash[3];
62
63 ROUND1(a, b, c, d, in[0], 3);
64 ROUND1(d, a, b, c, in[1], 7);
65 ROUND1(c, d, a, b, in[2], 11);
66 ROUND1(b, c, d, a, in[3], 19);
67 ROUND1(a, b, c, d, in[4], 3);
68 ROUND1(d, a, b, c, in[5], 7);
69 ROUND1(c, d, a, b, in[6], 11);
70 ROUND1(b, c, d, a, in[7], 19);
71 ROUND1(a, b, c, d, in[8], 3);
72 ROUND1(d, a, b, c, in[9], 7);
73 ROUND1(c, d, a, b, in[10], 11);
74 ROUND1(b, c, d, a, in[11], 19);
75 ROUND1(a, b, c, d, in[12], 3);
76 ROUND1(d, a, b, c, in[13], 7);
77 ROUND1(c, d, a, b, in[14], 11);
78 ROUND1(b, c, d, a, in[15], 19);
79
80 ROUND2(a, b, c, d, in[0], 3);
81 ROUND2(d, a, b, c, in[4], 5);
82 ROUND2(c, d, a, b, in[8], 9);
83 ROUND2(b, c, d, a, in[12], 13);
84 ROUND2(a, b, c, d, in[1], 3);
85 ROUND2(d, a, b, c, in[5], 5);
86 ROUND2(c, d, a, b, in[9], 9);
87 ROUND2(b, c, d, a, in[13], 13);
88 ROUND2(a, b, c, d, in[2], 3);
89 ROUND2(d, a, b, c, in[6], 5);
90 ROUND2(c, d, a, b, in[10], 9);
91 ROUND2(b, c, d, a, in[14], 13);
92 ROUND2(a, b, c, d, in[3], 3);
93 ROUND2(d, a, b, c, in[7], 5);
94 ROUND2(c, d, a, b, in[11], 9);
95 ROUND2(b, c, d, a, in[15], 13);
96
97 ROUND3(a, b, c, d, in[0], 3);
98 ROUND3(d, a, b, c, in[8], 9);
99 ROUND3(c, d, a, b, in[4], 11);
100 ROUND3(b, c, d, a, in[12], 15);
101 ROUND3(a, b, c, d, in[2], 3);
102 ROUND3(d, a, b, c, in[10], 9);
103 ROUND3(c, d, a, b, in[6], 11);
104 ROUND3(b, c, d, a, in[14], 15);
105 ROUND3(a, b, c, d, in[1], 3);
106 ROUND3(d, a, b, c, in[9], 9);
107 ROUND3(c, d, a, b, in[5], 11);
108 ROUND3(b, c, d, a, in[13], 15);
109 ROUND3(a, b, c, d, in[3], 3);
110 ROUND3(d, a, b, c, in[11], 9);
111 ROUND3(c, d, a, b, in[7], 11);
112 ROUND3(b, c, d, a, in[15], 15);
113
114 hash[0] += a;
115 hash[1] += b;
116 hash[2] += c;
117 hash[3] += d;
118}
119
120static inline void md4_transform_helper(struct md4_ctx *ctx)
121{
122 le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
123 md4_transform(ctx->hash, ctx->block);
124}
125
126int cifs_md4_init(struct md4_ctx *mctx)
127{
128 memset(mctx, 0, sizeof(struct md4_ctx));
129 mctx->hash[0] = 0x67452301;
130 mctx->hash[1] = 0xefcdab89;
131 mctx->hash[2] = 0x98badcfe;
132 mctx->hash[3] = 0x10325476;
133 mctx->byte_count = 0;
134
135 return 0;
136}
137EXPORT_SYMBOL_GPL(cifs_md4_init);
138
139int cifs_md4_update(struct md4_ctx *mctx, const u8 *data, unsigned int len)
140{
141 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
142
143 mctx->byte_count += len;
144
145 if (avail > len) {
146 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
147 data, len);
148 return 0;
149 }
150
151 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
152 data, avail);
153
154 md4_transform_helper(mctx);
155 data += avail;
156 len -= avail;
157
158 while (len >= sizeof(mctx->block)) {
159 memcpy(mctx->block, data, sizeof(mctx->block));
160 md4_transform_helper(mctx);
161 data += sizeof(mctx->block);
162 len -= sizeof(mctx->block);
163 }
164
165 memcpy(mctx->block, data, len);
166
167 return 0;
168}
169EXPORT_SYMBOL_GPL(cifs_md4_update);
170
171int cifs_md4_final(struct md4_ctx *mctx, u8 *out)
172{
173 const unsigned int offset = mctx->byte_count & 0x3f;
174 char *p = (char *)mctx->block + offset;
175 int padding = 56 - (offset + 1);
176
177 *p++ = 0x80;
178 if (padding < 0) {
179 memset(p, 0x00, padding + sizeof(u64));
180 md4_transform_helper(mctx);
181 p = (char *)mctx->block;
182 padding = 56;
183 }
184
185 memset(p, 0, padding);
186 mctx->block[14] = mctx->byte_count << 3;
187 mctx->block[15] = mctx->byte_count >> 29;
188 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
189 sizeof(u64)) / sizeof(u32));
190 md4_transform(mctx->hash, mctx->block);
191 cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash));
192 memcpy(out, mctx->hash, sizeof(mctx->hash));
193 memset(mctx, 0, sizeof(*mctx));
194
195 return 0;
196}
197EXPORT_SYMBOL_GPL(cifs_md4_final);
198
