| 1 | |
| 2 | #ifndef TRANSFORM_COMMON_H |
| 3 | #define TRANSFORM_COMMON_H |
| 4 | |
| 5 | #define KEYED_CHECK do{ \ |
| 6 | if (!ti->keyed) { \ |
| 7 | *errmsg="transform unkeyed"; \ |
| 8 | return 1; \ |
| 9 | } \ |
| 10 | }while(0) |
| 11 | |
| 12 | #define SEQNUM_CHECK(seqnum, max_skew) do{ \ |
| 13 | uint32_t skew=seqnum-ti->lastrecvseq; \ |
| 14 | if (skew<0x8fffffff) { \ |
| 15 | /* Ok */ \ |
| 16 | ti->lastrecvseq=seqnum; \ |
| 17 | } else if ((0-skew)<max_skew) { \ |
| 18 | /* Ok */ \ |
| 19 | } else { \ |
| 20 | /* Too much skew */ \ |
| 21 | *errmsg="seqnum: too much skew"; \ |
| 22 | return 2; \ |
| 23 | } \ |
| 24 | }while(0) |
| 25 | |
| 26 | #define TRANSFORM_VALID \ |
| 27 | static bool_t transform_valid(void *sst) \ |
| 28 | { \ |
| 29 | struct transform_inst *ti=sst; \ |
| 30 | \ |
| 31 | return ti->keyed; \ |
| 32 | } |
| 33 | |
| 34 | #define TRANSFORM_DESTROY \ |
| 35 | static void transform_destroy(void *sst) \ |
| 36 | { \ |
| 37 | struct transform_inst *st=sst; \ |
| 38 | \ |
| 39 | FILLZERO(*st); /* Destroy key material */ \ |
| 40 | free(st); \ |
| 41 | } |
| 42 | |
| 43 | #define TRANSFORM_CREATE_CORE \ |
| 44 | struct transform_inst *ti; \ |
| 45 | ti=safe_malloc(sizeof(*ti),"transform_create"); \ |
| 46 | /* mlock XXX */ \ |
| 47 | ti->ops.st=ti; \ |
| 48 | ti->ops.setkey=transform_setkey; \ |
| 49 | ti->ops.valid=transform_valid; \ |
| 50 | ti->ops.delkey=transform_delkey; \ |
| 51 | ti->ops.forwards=transform_forward; \ |
| 52 | ti->ops.reverse=transform_reverse; \ |
| 53 | ti->ops.destroy=transform_destroy; \ |
| 54 | ti->keyed=False; |
| 55 | |
| 56 | #endif /*TRANSFORM_COMMON_H*/ |