| 1 | /* |
| 2 | ** Copyright 1998 - 2008 Double Precision, Inc. |
| 3 | ** See COPYING for distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include <stdlib.h> |
| 7 | |
| 8 | static const char decode64tab[256]= { |
| 9 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 10 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 11 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 12 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 13 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 14 | 100, 100, 100, 62, 100, 100, 100, 63, |
| 15 | 52, 53, 54, 55, 56, 57, 58, 59, |
| 16 | 60, 61, 100, 100, 100, 100, 100, 100, |
| 17 | 100, 0, 1, 2, 3, 4, 5, 6, |
| 18 | 7, 8, 9, 10, 11, 12, 13, 14, |
| 19 | 15, 16, 17, 18, 19, 20, 21, 22, |
| 20 | 23, 24, 25, 100, 100, 100, 100, 100, |
| 21 | 100, 26, 27, 28, 29, 30, 31, 32, |
| 22 | 33, 34, 35, 36, 37, 38, 39, 40, |
| 23 | 41, 42, 43, 44, 45, 46, 47, 48, |
| 24 | 49, 50, 51, 100, 100, 100, 100, 100, |
| 25 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 26 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 27 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 28 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 29 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 30 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 31 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 32 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 33 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 34 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 35 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 36 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 37 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 38 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 39 | 100, 100, 100, 100, 100, 100, 100, 100, |
| 40 | 100, 100, 100, 100, 100, 100, 100, 100}; |
| 41 | |
| 42 | int authsasl_frombase64(char *base64buf) |
| 43 | { |
| 44 | int i, j, k; |
| 45 | |
| 46 | for (j=0; base64buf[j]; j++) |
| 47 | if (decode64tab[(unsigned char)base64buf[j]] >= 100) |
| 48 | break; |
| 49 | |
| 50 | if (base64buf[j] && base64buf[j+1] && base64buf[j+2]) |
| 51 | return (-1); |
| 52 | while (base64buf[j] == '=') ++j; |
| 53 | if (j % 4) return (-1); |
| 54 | |
| 55 | i=j; |
| 56 | k=0; |
| 57 | for (j=0; j<i; j += 4) |
| 58 | { |
| 59 | int w=decode64tab[(int)(unsigned char)base64buf[j]]; |
| 60 | int x=decode64tab[(int)(unsigned char)base64buf[j+1]]; |
| 61 | int y=decode64tab[(int)(unsigned char)base64buf[j+2]]; |
| 62 | int z=decode64tab[(int)(unsigned char)base64buf[j+3]]; |
| 63 | int a,b,c; |
| 64 | |
| 65 | a= (w << 2) | (x >> 4); |
| 66 | b= (x << 4) | (y >> 2); |
| 67 | c= (y << 6) | z; |
| 68 | base64buf[k++]=a; |
| 69 | if ( base64buf[j+2] != '=') |
| 70 | base64buf[k++]=b; |
| 71 | if ( base64buf[j+3] != '=') |
| 72 | base64buf[k++]=c; |
| 73 | } |
| 74 | return (k); |
| 75 | } |