6 * Description: Implementation of the MD5 hash algorithm as described in RFC 1321
18 void md5_init(md5_ctx_t *s){
26 uint32_t md5_F(uint32_t x, uint32_t y, uint32_t z){
27 return ((x&y)|((~x)&z));
30 uint32_t md5_G(uint32_t x, uint32_t y, uint32_t z){
31 return ((x&z)|((~z)&y));
34 uint32_t md5_H(uint32_t x, uint32_t y, uint32_t z){
38 uint32_t md5_I(uint32_t x, uint32_t y, uint32_t z){
39 return (y ^ (x | (~z)));
42 typedef uint32_t md5_func_t(uint32_t, uint32_t, uint32_t);
44 #define ROTL32(x,n) (((x)<<(n)) | ((x)>>(32-(n))))
46 void md5_core(uint32_t* a, uint8_t as, void* block, uint8_t k, uint8_t s, uint8_t i, uint8_t fi){
48 md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
50 /* a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
52 char funcc[]={'*', '-', '+', '~'};
53 uart_putstr("\r\n DBG: md5_core [");
55 uart_hexdump(&as, 1); uart_putc(' ');
56 uart_hexdump(&k, 1); uart_putc(' ');
57 uart_hexdump(&s, 1); uart_putc(' ');
58 uart_hexdump(&i, 1); uart_putc(']');
60 t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + ((uint32_t*)block)[k] + md5_T[i] ;
61 a[as]=a[(as+1)&3] + ROTL32(t, s);
64 void md5_nextBlock(md5_ctx_t *state, void* block){
67 /* this requires other mixed sboxes */
69 uart_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
70 uart_hexdump(block, 16); uart_putstr("\r\n");
71 uart_hexdump(block+16, 16); uart_putstr("\r\n");
72 uart_hexdump(block+32, 16); uart_putstr("\r\n");
73 uart_hexdump(block+48, 16); uart_putstr("\r\n");
82 uint8_t s1t[]={7,12,17,22};
85 md5_core(a, 4-n, block, m*4+n, s1t[n],i++,0);
89 uint8_t s2t[]={5,9,14,20};
92 md5_core(a, 4-n, block, (1+m*4+n*5)&0xf, s2t[n],i++,1);
96 uint8_t s3t[]={4,11,16,23};
99 md5_core(a, 4-n, block, (5-m*4+n*3)&0xf, s3t[n],i++,2);
103 uint8_t s4t[]={6,10,15,21};
106 md5_core(a, 4-n, block, (0-m*4+n*7)&0xf, s4t[n],i++,3);
116 void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
119 while (length >= 512){
120 md5_nextBlock(state, block);
125 memcpy(b, block, length/8);
126 /* insert padding one */
130 t = ((uint8_t*)block)[l];
131 t |= (0x80>>(length%8));
136 /* insert length value */
137 if(l+sizeof(uint64_t) > 512/8){
138 md5_nextBlock(state, b);
142 *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length;
143 md5_nextBlock(state, b);