| 1 | /*Id:$*/ |
| 2 | /*Name:$*/ |
| 3 | |
| 4 | #include "stralloc.h" |
| 5 | #include "surf.h" |
| 6 | #include "uint32.h" |
| 7 | #include "makehash.h" |
| 8 | |
| 9 | typedef struct { |
| 10 | uint32 seed[32]; |
| 11 | uint32 sum[8]; |
| 12 | uint32 out[8]; |
| 13 | uint32 in[12]; |
| 14 | int todo; |
| 15 | } surfpcs; |
| 16 | |
| 17 | #define SURFPCS_LEN 32 |
| 18 | |
| 19 | static void surfpcs_init(s,k) |
| 20 | surfpcs *s; |
| 21 | uint32 k[32]; |
| 22 | { |
| 23 | int i; |
| 24 | for (i = 0;i < 32;++i) s->seed[i] = k[i]; |
| 25 | for (i = 0;i < 8;++i) s->sum[i] = 0; |
| 26 | for (i = 0;i < 12;++i) s->in[i] = 0; |
| 27 | s->todo = 0; |
| 28 | } |
| 29 | |
| 30 | static uint32 littleendian[8] = { |
| 31 | 50462976, 117835012, 185207048, 252579084, |
| 32 | 319951120, 387323156, 454695192, 522067228 |
| 33 | } ; |
| 34 | #define end ((unsigned char *) littleendian) |
| 35 | |
| 36 | #define data ((unsigned char *) s->in) |
| 37 | #define outdata ((unsigned char *) s->out) |
| 38 | |
| 39 | static void surfpcs_addlc(s,x,n) |
| 40 | /* modified from Dan's surfpcs_add by skipping ' ' & '\t' and */ |
| 41 | /* case-independence */ |
| 42 | surfpcs *s; |
| 43 | unsigned char *x; |
| 44 | unsigned int n; |
| 45 | { |
| 46 | register unsigned char ch; |
| 47 | int i; |
| 48 | while (n--) { |
| 49 | ch = *x++; |
| 50 | if (ch == ' ' || ch == '\t') continue; |
| 51 | if (ch >= 'A' && ch <= 'Z') |
| 52 | data[end[s->todo++]] = ch - 'A' + 'a'; |
| 53 | else |
| 54 | data[end[s->todo++]] = ch; |
| 55 | if (s->todo == 32) { |
| 56 | s->todo = 0; |
| 57 | if (!++s->in[8]) |
| 58 | if (!++s->in[9]) |
| 59 | if (!++s->in[10]) |
| 60 | ++s->in[11]; |
| 61 | surf(s->out,s->in,s->seed); |
| 62 | for (i = 0;i < 8;++i) |
| 63 | s->sum[i] += s->out[i]; |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | static void surfpcs_out(s,h) |
| 69 | surfpcs *s; |
| 70 | unsigned char h[32]; |
| 71 | { |
| 72 | int i; |
| 73 | surfpcs_addlc(s,".",1); |
| 74 | while (s->todo) surfpcs_addlc(s,"",1); |
| 75 | for (i = 0;i < 8;++i) s->in[i] = s->sum[i]; |
| 76 | for (;i < 12;++i) s->in[i] = 0; |
| 77 | surf(s->out,s->in,s->seed); |
| 78 | for (i = 0;i < 32;++i) h[i] = outdata[end[i]]; |
| 79 | } |
| 80 | |
| 81 | void makehash(indata,inlen,hash) |
| 82 | char *indata; |
| 83 | unsigned int inlen; |
| 84 | char *hash; |
| 85 | /* makes hash[COOKIE=20] from stralloc *indata, ignoring case and */ |
| 86 | /* SPACE/TAB */ |
| 87 | { |
| 88 | unsigned char h[32]; |
| 89 | surfpcs s; |
| 90 | uint32 seed[32]; |
| 91 | int i; |
| 92 | |
| 93 | for (i = 0;i < 32;++i) seed[i] = 0; |
| 94 | surfpcs_init(&s,seed); |
| 95 | surfpcs_addlc(&s,indata,inlen); |
| 96 | surfpcs_out(&s,h); |
| 97 | for (i = 0;i < 20;++i) |
| 98 | hash[i] = 'a' + (h[i] & 15); |
| 99 | } |
| 100 | |
| 101 | static stralloc dummy = {0}; |
| 102 | |
| 103 | void mkauthhash(s,len,h) |
| 104 | char *s; unsigned int len; char *h; |
| 105 | /* This is a string that should be the same for all messages from a given */ |
| 106 | /* author. Doesn't have to be the real rfc822 address. We look for a '@' */ |
| 107 | /* and grab everything up to the next '>', ' ', or ';'. We go back the same */ |
| 108 | /* way, then take everything up to the '@' or the first '-'. The latter */ |
| 109 | /* avoids problems with posters that band their addresses. */ |
| 110 | { |
| 111 | unsigned int i,j,k,l; |
| 112 | register char ch; |
| 113 | |
| 114 | j = k = l = 0; |
| 115 | i = byte_rchr(s,len,'@'); |
| 116 | if (i < len) { /* if not then i=sa->len, j=k=l=0 */ |
| 117 | j = i; |
| 118 | while (++j < len) { /* if not found, then j=sa->len */ |
| 119 | ch = s[j]; |
| 120 | if (ch == '>' || ch == ' ' || ch == ';') break; |
| 121 | } |
| 122 | k = i; |
| 123 | while (k > 0) { /* k <= i */ |
| 124 | ch = s[--k]; |
| 125 | if (ch == '<' || ch == ' ' || ch == ';') break; |
| 126 | } |
| 127 | l = k; /* k <= l <= i; */ |
| 128 | while (l < i && s[l] != '-') ++l; |
| 129 | if (!stralloc_copyb(&dummy,s + k, l - k)) die_nomem(); |
| 130 | if (!stralloc_catb(&dummy,s + i, j - i)) die_nomem(); |
| 131 | makehash(dummy.s,dummy.len,h); |
| 132 | } else /* use entire line if no '@' found */ |
| 133 | makehash(s,len,h); |
| 134 | } |
| 135 | |
| 136 | |