X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=tfc_skein.c;h=e05927da18385375aa61ea314737b65e9f2890be;hb=8f5731f876403829977834c82c7afbecc484a02d;hp=b3b2019d5875d446d3704ea854f8511c72f0ce34;hpb=429747d78e7e60b3dc44fd8b23f1626c386663e0;p=tfcrypt.git

diff --git a/tfc_skein.c b/tfc_skein.c
index b3b2019..e05927d 100644
--- a/tfc_skein.c
+++ b/tfc_skein.c
@@ -39,17 +39,7 @@ void skein(void *hash, size_t bits, const void *key, const void *data, size_t sz
 	skein_final(hash, &sk);
 }
 
-void tf_key_tweak_compat(void *key)
-{
-	TF_UNIT_TYPE *ukey = key, c = THREEFISH_CONST;
-	size_t x;
-
-	for (x = 0; x < TF_NR_BLOCK_UNITS; x++) c ^= ukey[x];
-	ukey[x] = c;
-	ukey[TF_TWEAK_WORD3] = ukey[TF_TWEAK_WORD1] ^ ukey[TF_TWEAK_WORD2];
-}
-
-tfc_yesno skeinfd(void *hash, size_t bits, const void *key, int fd, tfc_fsize readto)
+tfc_yesno skeinfd(void *hash, size_t bits, const void *key, int fd, tfc_fsize offset, tfc_fsize readto)
 {
 	static tfc_byte skblk[TFC_BLKSIZE];
 
@@ -62,9 +52,16 @@ tfc_yesno skeinfd(void *hash, size_t bits, const void *key, int fd, tfc_fsize re
 	if (ctr_mode == TFC_MODE_SKSUM) total_processed_src = total_processed_dst = delta_processed = 0;
 
 	if (fd == -1) goto _fail;
-	if (fd > 2 && readto == NOFSIZE) {
-		readto = tfc_fdsize(fd);
-		if (readto == NOFSIZE) goto _fail;
+	if (fd > 2) {
+		if (readto == NOFSIZE) {
+			readto = tfc_fdsize(fd);
+			if (readto == NOFSIZE) goto _fail;
+		}
+		if (offset != 0 && offset != NOFSIZE) {
+			if (lseek(fd, (off_t)offset, SEEK_SET) == -1) {
+				if (ignore_seek_errors == NO) goto _fail;
+			}
+		}
 	}
 
 	if (key) skein_init_key(&sk, key, bits);
@@ -197,8 +194,7 @@ _dothat:
 
 		while (1) {
 			memset(sksblk, 0, sizeof(sksblk));
-			x = xfgets(sksblk, sizeof(sksblk), f);
-			if (x == 0) break;
+			if (xfgets(sksblk, sizeof(sksblk), f) != YES) break;
 
 			s = d = sksblk; t = NULL;
 			shash = fname = NULL;
@@ -226,7 +222,7 @@ _dothat:
 			}
 
 			if (status_timer) setup_next_alarm(status_timer);
-			if (skeinfd(hash, bits, mackey_opt ? mackey : NULL, fd, maxlen) != YES) {
+			if (skeinfd(hash, bits, mackey_opt ? mackey : NULL, fd, iseek, maxlen) != YES) {
 				xerror(YES, NO, YES, "%s", fname);
 				exitcode = 1;
 				continue;
@@ -278,7 +274,7 @@ _dothat:
 		}
 
 _dohash:	if (status_timer) setup_next_alarm(status_timer);
-		if (skeinfd(hash, bits, mackey_opt ? mackey : NULL, fd, maxlen) != YES) {
+		if (skeinfd(hash, bits, mackey_opt ? mackey : NULL, fd, iseek, maxlen) != YES) {
 			xerror(YES, NO, YES, "%s", fargv[x]);
 			exitcode = 1;
 			continue;