6 * Description: Implementation of the MD5 hash algorithm as described in RFC 1321
16 void md5_init(md5_ctx_t *s){
24 uint32_t md5_F(uint32_t x, uint32_t y, uint32_t z){
25 return ((x&y)|((~x)&z));
28 uint32_t md5_G(uint32_t x, uint32_t y, uint32_t z){
29 return ((x&z)|((~z)&y));
32 uint32_t md5_H(uint32_t x, uint32_t y, uint32_t z){
36 uint32_t md5_I(uint32_t x, uint32_t y, uint32_t z){
37 return (y ^ (x | (~z)));
40 typedef uint32_t md5_func_t(uint32_t, uint32_t, uint32_t);
42 #define ROTL32(x,n) ((x)<<(n) | (x)>>(32-(n)))
44 void md5_core(uint32_t* a, uint8_t as, void* block, uint8_t k, uint8_t s, uint8_t i, uint8_t fi){
46 md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
47 char funcc[]={'*', '-', '+', '~'};
49 /* a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
50 uart_putstr("\r\n DBG: md5_core [");
52 uart_hexdump(&as, 1); uart_putc(' ');
53 uart_hexdump(&k, 1); uart_putc(' ');
54 uart_hexdump(&s, 1); uart_putc(' ');
55 uart_hexdump(&i, 1); uart_putc(']');
56 t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + ((uint8_t*)block)[k] + md5_T[i] ;
57 a[as]=a[(as+1)&3] + ROTL32(t, s);
60 void md5_nextBlock(md5_ctx_t *state, void* block){
63 /* this requires other mixed sboxes */
64 uart_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
65 uart_hexdump(block, 16); uart_putstr("\r\n");
66 uart_hexdump(block+16, 16); uart_putstr("\r\n");
67 uart_hexdump(block+32, 16); uart_putstr("\r\n");
68 uart_hexdump(block+48, 16); uart_putstr("\r\n");
76 uint8_t s1t[]={7,12,17,22};
79 md5_core(a, 4-n, block, m*4+n, s1t[n],i++,0);
80 /* t = a[(4-s)&3] + md5_F(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
81 + ((uint8_t*)block)[s+4*k] + md5_T[i++];
82 a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s*5+7);
86 uint8_t s2t[]={5,9,14,20};
89 md5_core(a, 4-n, block, (1+m*4+n*5)&0xf, s2t[n],i++,1);
94 t = a[(4-s)&3] + md5_G(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
95 + ((uint8_t*)block)[((1+s*5) +(k*4))&0xf] + md5_T[i++];
96 a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s2t[s]);
101 uint8_t s3t[]={4,11,16,23};
104 md5_core(a, 4-n, block, (5-m*4+n*3)&0xf, s3t[n],i++,2);
109 t = a[(4-s)&3] + md5_H(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
110 + ((uint8_t*)block)[((5+s*3)-(k*4))&0xf] + md5_T[i++];
111 a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s3t[s]);
115 uint8_t s4t[]={6,10,15,21};
118 md5_core(a, 4-n, block, (0-m*4+n*7)&0xf, s4t[n],i++,3);
123 t = a[(4-s)&3] + md5_I(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
124 + ((uint8_t*)block)[((s*7)-(k*4))&0xf] + md5_T[i++];
125 a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s4t[s]);
135 void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
138 while (length >= 512){
139 md5_nextBlock(state, block);
144 memcpy(b, block, length/8);
145 /* insert padding one */
149 t = ((uint8_t*)block)[l];
150 t |= (0x80>>(length%8));
155 /* insert length value */
156 if(l+sizeof(uint64_t) > 512/8){
157 md5_nextBlock(state, b);
161 *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length;
162 md5_nextBlock(state, b);