Add Propagating CBC (PCBC) mode

[tfcrypt.git] / tfcrypt.c

diff --git a/tfcrypt.c b/tfcrypt.c
index 2b2a26f367aed57659c3f0d65f34203857a2ce4a..45438cb2bde7dc46cdc05ea0fba5b20d7ca7eebf 100644 (file)
--- a/tfcrypt.c
+++ b/tfcrypt.c
@@ -30,6 +30,7 @@
 
 static tfc_byte svctr[TF_BLOCK_SIZE];
 static tfc_fsize rwd, do_read_loops, loopcnt;
+static tfc_yesno unbuffered;
 
 static void open_log(const char *logfile)
 {
@@ -208,6 +209,8 @@ _baddfname:
                                        ctr_mode = TFC_MODE_STREAM;
                                else if (!strcasecmp(optarg, "cbc"))
                                        ctr_mode = TFC_MODE_CBC;
+                               else if (!strcasecmp(optarg, "pcbc"))
+                                       ctr_mode = TFC_MODE_PCBC;
                                else if (!strcasecmp(optarg, "ecb"))
                                        ctr_mode = TFC_MODE_ECB;
                                else if (!strcasecmp(optarg, "xts"))
@@ -346,6 +349,12 @@ _baddfname:
                                                show_when_done = YES;
                                        else if (!strcmp(s, "pid"))
                                                show_pid = YES;
+                                       else if (!strcmp(s, "nobuf")) {
+                                               if (!tfc_is_freestream(ctr_mode)) xerror(NO, YES, YES,
+                                                       "cannot activate unbuffered mode for non-stream cipher mode %s!",
+                                                       tfc_modename(ctr_mode));
+                                               else unbuffered = YES;
+                                       }
                                        else if (!strncmp(s, "readloops", 9) && *(s+9) == '=') {
                                                do_read_loops = tfc_humanfsize(s+10, &stoi);
                                                if (!str_empty(stoi)) do_read_loops = NOSIZE;
@@ -362,7 +371,7 @@ _baddfname:
                                                        "%s: invalid block size value", s);
                                                }
                                                else blksize = (size_t)tfc_modifysize((tfc_fsize)blksize, strchr(s, ':'));
-                                               if (!tfc_is_stream(ctr_mode) && blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
+                                               if (!tfc_is_freestream(ctr_mode) && blksize < TF_BLOCK_SIZE) xerror(NO, YES, YES,
                                                        "%s: block size is lesser than TF_BLOCK_SIZE (%u bytes)", s, TFC_U(TF_BLOCK_SIZE));
                                                if (blksize > TFC_BLKSIZE) xerror(NO, YES, YES,
                                                        "%s: block size exceeds %u bytes",
@@ -763,7 +772,7 @@ _mkragain:          lio = xread(mkfd, pblk, lrem);
        || !memcmp(progname+5, "sum", 3)
        || !memcmp(progname+6, "sum", 3)))))
                do_sksum(progname, argv+optind);
-       if (!strcmp(progname, "tfbase64")) do_edbase64(argv+optind);
+       if (!strcmp(progname, "base64")) do_edbase64(argv+optind);
 
        idx = optind;
 
@@ -1209,7 +1218,7 @@ _ragain:  lio = xread(sfd, pblk, lrem);
                                default: xerror(NO, NO, NO, "%s", srcfname); break;
                        }
                }
-               if (lio && lio < lrem) {
+               if (unbuffered == NO && lio && lio < lrem) {
                        pblk += lio;
                        lrem -= lio;
                        goto _ragain;
@@ -1239,6 +1248,10 @@ _ragain: lio = xread(sfd, pblk, lrem);
                        tf_cbc_encrypt(key, ctr, dstblk, srcblk, ldone);
                else if (ctr_mode == TFC_MODE_CBC && do_edcrypt == TFC_DO_DECRYPT)
                        tf_cbc_decrypt(key, ctr, dstblk, srcblk, ldone);
+               else if (ctr_mode == TFC_MODE_PCBC && do_edcrypt == TFC_DO_ENCRYPT)
+                       tf_pcbc_encrypt(key, ctr, dstblk, srcblk, ldone);
+               else if (ctr_mode == TFC_MODE_PCBC && do_edcrypt == TFC_DO_DECRYPT)
+                       tf_pcbc_decrypt(key, ctr, dstblk, srcblk, ldone);
 
                else if (ctr_mode == TFC_MODE_PLAIN)
                        memcpy(dstblk, srcblk, ldone);
@@ -1333,6 +1346,7 @@ _macragain:               lio = xread(sfd, pblk, lrem);
                else if (ctr_mode == TFC_MODE_XTS) tf_xts_decrypt(key, xtskey, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits), xtsblocks);
                else if (ctr_mode == TFC_MODE_ECB) tf_ecb_decrypt(key, tmpdata, macvrfy, TF_FROM_BITS(macbits));
                else if (ctr_mode == TFC_MODE_CBC) tf_cbc_decrypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
+               else if (ctr_mode == TFC_MODE_PCBC) tf_pcbc_decrypt(key, ctr, tmpdata, macvrfy, TF_FROM_BITS(macbits));
 
                if (!memcmp(tmpdata, macresult, TF_FROM_BITS(macbits))) {
                        if (quiet == NO) {
@@ -1370,6 +1384,7 @@ _shortmac:        memset(macvrfy, 0, sizeof(macvrfy));
                else if (ctr_mode == TFC_MODE_XTS) tf_xts_encrypt(key, xtskey, ctr, tmpdata, macresult, TF_FROM_BITS(macbits), xtsblocks);
                else if (ctr_mode == TFC_MODE_ECB) tf_ecb_encrypt(key, tmpdata, macresult, TF_FROM_BITS(macbits));
                else if (ctr_mode == TFC_MODE_CBC) tf_cbc_encrypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
+               else if (ctr_mode == TFC_MODE_PCBC) tf_pcbc_encrypt(key, ctr, tmpdata, macresult, TF_FROM_BITS(macbits));
                memset(macresult, 0, sizeof(macresult));
 
                if (!do_mac_file) {