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Difference between revisions of "Seputil"
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{{Infobox software |
{{Infobox software |
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| name = seputil |
| name = seputil |
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}} |
}} |
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| − | '''seputil''' is an |
+ | '''seputil''' is an iOS command-line interface tool. It is used to communicate with the [[Secure Enclave]] and its processor - the SEP. The utility [[ramrod]] also uses seputil to update the firmware of the SEP. seputil itself is contained in HXXXRamDisk.dmg, located in <code>/usr/standalone/update/ramdisk/</code> (the name of the ramdisk varies depending on the firmware.) Once mounted, the seputil executable is found in <code>/usr/libexec/</code>. The file is an [[IMG4 File Format|IMG4]] file and therefore needs the first 0x1b (27) bytes are stripped to make the dmg readable, or img4tool can be used |
seputil has the following commands: |
seputil has the following commands: |
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seputil: --art set Persist the supplied ART to storage |
seputil: --art set Persist the supplied ART to storage |
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seputil: --art clear Clear the persisted ART |
seputil: --art clear Clear the persisted ART |
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| − | seputil: --art ctrtest Counter self-test (DESTRUCTIVE - |
+ | seputil: --art ctrtest Counter self-test (DESTRUCTIVE - can brick some legacy devices!) |
seputil: --sleep Sleep the SEP NOW! |
seputil: --sleep Sleep the SEP NOW! |
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seputil: --nap Nap the SEP NOW! |
seputil: --nap Nap the SEP NOW! |
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| Line 81: | Line 82: | ||
sleep hash is absent |
sleep hash is absent |
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restore nonce (20 bytes): 67fc18385630dc6429726677d196c81466f47b5e |
restore nonce (20 bytes): 67fc18385630dc6429726677d196c81466f47b5e |
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| − | |||
| − | ./seputil --art set |
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| − | Segmentation fault: 11 |
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./seputil --log |
./seputil --log |
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| Line 294: | Line 292: | ||
519c0248f04d316a3d71e03978b4126fbfb2b15c — value (of manifest hash) |
519c0248f04d316a3d71e03978b4126fbfb2b15c — value (of manifest hash) |
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04 — type tag indicating STRING |
04 — type tag indicating STRING |
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| − | 00 — length in octets of value that follows (0); empty, so no value to follow (sleep |
+ | 00 — length in octets of value that follows (0); empty, so no value to follow (sleep hash is absent) |
04 — type tag indicating STRING |
04 — type tag indicating STRING |
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14 — length in octets of value that follows (20) |
14 — length in octets of value that follows (20) |
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| − | 67fc18385630dc6429726677d196c81466f47b5e — value (of restore nonce) |
+ | 67fc18385630dc6429726677d196c81466f47b5e — value (of restore nonce: snon) |
| − | 31 — type tag indicating SET |
+ | 31 — type tag indicating SET (of subcounters) |
03 — length in octets of value that follows (3) |
03 — length in octets of value that follows (3) |
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| − | c00100 — value |
+ | c00100 — value (priv element [0]=0) |
04 — type tag indicating STRING |
04 — type tag indicating STRING |
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20 — length in octets of value that follows (32) |
20 — length in octets of value that follows (32) |
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| − | 27b6dadbab356612997af0203cefeae51fe90cd985ee7cdd6211c766b8cc7a60 — value |
+ | 27b6dadbab356612997af0203cefeae51fe90cd985ee7cdd6211c766b8cc7a60 — value (SHA-256 HMAC of the previous SEQUENCE) |
</pre> |
</pre> |
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| Line 333: | Line 331: | ||
Example 3: |
Example 3: |
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| + | Don't try this at home kids!<br />DESTRUCTIVE - WILL [[Brick|BRICK]] SOME LEGACY DEVICES!!! |
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<pre> |
<pre> |
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./seputil --art clear |
./seputil --art clear |
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Latest revision as of 23:07, 26 September 2021
| Original author(s) | Apple Inc. |
|---|---|
| Developer(s) | Apple Inc. |
| Operating system | iOS command line |
| Size | 59,184 bytes [APP] |
| Available in | English |
| Type | ? |
| License | Closed source |
seputil is an iOS command-line interface tool. It is used to communicate with the Secure Enclave and its processor - the SEP. The utility ramrod also uses seputil to update the firmware of the SEP. seputil itself is contained in HXXXRamDisk.dmg, located in /usr/standalone/update/ramdisk/ (the name of the ramdisk varies depending on the firmware.) Once mounted, the seputil executable is found in /usr/libexec/. The file is an IMG4 file and therefore needs the first 0x1b (27) bytes are stripped to make the dmg readable, or img4tool can be used
seputil has the following commands:
seputil: seputil [--wait] --load <file> seputil: seputil '<SEP console command>' seputil: seputil <command> seputil: seputil: Valid <command> words: seputil: --ping Send a PING operation to the SEP OS seputil: --load Load <file> as the SEP runtime firmware seputil: --restore Load <file> as the SEP runtime firmware in restore mode seputil: --restore+art Load <file> as the SEP runtime firmware in restore mode with ART seputil: --wait Pause for kernel driver to load before failing seputil: --preflight Pre-flight load/restore firmware against ART to pre-check for boot failures seputil: --log Dump the mailbox message log seputil: --rom status Get the ROM status seputil: --rom tz0 Send a ROM TZ0 command seputil: --rom nop Send a ROM NOP command seputil: --rom nonce Send a ROM nonce request seputil: --new-nonce Request new SEP/OS nonce seputil: --kill-nonce Request invalidate SEP/OS nonce seputil: --art get Dump current ART from Memory seputil: --art set Persist the supplied ART to storage seputil: --art clear Clear the persisted ART seputil: --art ctrtest Counter self-test (DESTRUCTIVE - can brick some legacy devices!) seputil: --sleep Sleep the SEP NOW! seputil: --nap Nap the SEP NOW! seputil: --pingflood Ping SEP endlessly seputil: --clkgate Enable SEP clock gating seputil: --get <obj> Read obj and write to stdout seputil: --put <obj> Read stdin and write to obj seputil: --boot-check <file> Check whether a firmware might be bootable WRT the current ART seputil: --dump-fw <file> Dump measurements of firmware file seputil: Bare words on the commandline are sent to the SEP as a console command
Examples
./seputil --pingflood SEP ping #1000 SEP ping #2000 SEP ping #3000 SEP ping #4000 ./seputil --load sep-firmware.img4 seputil: load fw returned 0xe00002d5 seputil: load failed ./seputil --new-nonce Nonce (20 bytes): 0x67fc18385630dc6429726677d196c81466f47b5e ./seputil --art get raw ART: 305e0201003037020218340414519c0248f04d316a3d71e03978b4126fbfb2b15c0400041467fc18385630dc6429726677d196c81466f47b5e3103c00100042027b6dadbab356612997af0203cefeae51fe90cd985ee7cdd6211c766b8cc7a60 Successfully parsed ART: counter: 6196 manifest hash (20 bytes): 519c0248f04d316a3d71e03978b4126fbfb2b15c sleep hash is absent restore nonce (20 bytes): 67fc18385630dc6429726677d196c81466f47b5e ./seputil --log Kernel message log has 128 entries 289344381444: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289344385176: 0x0000000000000000 TX interrupt 289344391044: 0x0000000000000000 TX interrupt 289344408988: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289344409016: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289344413132: 0x0000000000000000 RX interrupt 289344413304: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289344413904: 0x0000000000000000 RX interrupt 289344413944: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289344414176: 0x0018000000dd1007 TX message ept 7, tag 10, opcode dd, param 0, data 180000 289344443356: 0x0000000000000000 RX interrupt 289344443428: 0x0068000000dd9007 RX message ept 7, tag 90, opcode dd, param 0, data 680000 289346822748: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 289346829480: 0x0000000000000000 RX interrupt 289346829560: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 289346830136: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 289406511168: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406511204: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406538900: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406538936: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406543628: 0x0000000000000000 TX interrupt 289406549916: 0x0000000000000000 TX interrupt 289406566580: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406566612: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289406571220: 0x0000000000000000 RX interrupt 289406571476: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289406571908: 0x0000000000000000 RX interrupt 289406571952: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289406572320: 0x0018000000de1007 TX message ept 7, tag 10, opcode de, param 0, data 180000 289406605068: 0x0000000000000000 RX interrupt 289406605152: 0x0068000000de9007 RX message ept 7, tag 90, opcode de, param 0, data 680000 289407383260: 0x003c000000df0907 TX message ept 7, tag 9, opcode df, param 0, data 3c0000 289407396284: 0x0000000000000000 RX interrupt 289407396380: 0x002c000000df8907 RX message ept 7, tag 89, opcode df, param 0, data 2c0000 289407403656: 0x003c000000e00907 TX message ept 7, tag 9, opcode e0, param 0, data 3c0000 289407411688: 0x0000000000000000 RX interrupt 289407411736: 0x002c000000e08907 RX message ept 7, tag 89, opcode e0, param 0, data 2c0000 289407414732: 0x003c000000e10907 TX message ept 7, tag 9, opcode e1, param 0, data 3c0000 289407422472: 0x0000000000000000 RX interrupt 289407422524: 0x002c000000e18907 RX message ept 7, tag 89, opcode e1, param 0, data 2c0000 289408986276: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 289408991756: 0x0000000000000000 RX interrupt 289408991824: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 289408992472: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 289459393276: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459393348: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459423004: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459423048: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459452628: 0x0000000000000000 TX interrupt 289459453612: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459453664: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289459466460: 0x0000000000000000 TX interrupt 289459469548: 0x0000000000000000 RX interrupt 289459470000: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289459470632: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289459471304: 0x0018000000e21007 TX message ept 7, tag 10, opcode e2, param 0, data 180000 289459524572: 0x0000000000000000 RX interrupt 289459524728: 0x0068000000e29007 RX message ept 7, tag 90, opcode e2, param 0, data 680000 289459532644: 0x004c000000e30f07 TX message ept 7, tag f, opcode e3, param 0, data 4c0000 289459552888: 0x0000000000000000 RX interrupt 289459553044: 0x002c000000e38f07 RX message ept 7, tag 8f, opcode e3, param 0, data 2c0000 289459646732: 0x0018000000e41007 TX message ept 7, tag 10, opcode e4, param 0, data 180000 289459681116: 0x0000000000000000 RX interrupt 289459681272: 0x0068000000e49007 RX message ept 7, tag 90, opcode e4, param 0, data 680000 289461898836: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 289461906796: 0x0000000000000000 RX interrupt 289461906968: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 289461908400: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 289526725980: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526726016: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526757512: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526757552: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526774468: 0x0000000000000000 TX interrupt 289526782688: 0x0000000000000000 TX interrupt 289526786468: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526786540: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289526795320: 0x0000000000000000 RX interrupt 289526795828: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289526796304: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289526796984: 0x0018000000e51007 TX message ept 7, tag 10, opcode e5, param 0, data 180000 289526847216: 0x0000000000000000 RX interrupt 289526847348: 0x0068000000e59007 RX message ept 7, tag 90, opcode e5, param 0, data 680000 289529224460: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 289529235316: 0x0000000000000000 RX interrupt 289529235488: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 289529236920: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 289584681764: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584681836: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584710576: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584710608: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584730996: 0x0000000000000000 TX interrupt 289584738992: 0x0000000000000000 TX interrupt 289584739572: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584739612: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289584748648: 0x0000000000000000 RX interrupt 289584748984: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289584749300: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 289584749332: 0x0018000000e61007 TX message ept 7, tag 10, opcode e6, param 0, data 180000 289584790484: 0x0000000000000000 RX interrupt 289584790568: 0x0068000000e69007 RX message ept 7, tag 90, opcode e6, param 0, data 680000 289587176748: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 289587185760: 0x0000000000000000 RX interrupt 289587185916: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 289587186840: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 288741485000: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741485084: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741514772: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741514812: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741533984: 0x0000000000000000 TX interrupt 288741541992: 0x0000000000000000 TX interrupt 288741543608: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741543680: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 288741552216: 0x0000000000000000 RX interrupt 288741552884: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 288741553388: 0x0000000000010000 RX message ept 0, tag 0, opcode 1, param 0, data 0 288741553672: 0x0018000000db1007 TX message ept 7, tag 10, opcode db, param 0, data 180000 288741591912: 0x0000000000000000 RX interrupt 288741592040: 0x0068000000db9007 RX message ept 7, tag 90, opcode db, param 0, data 680000 288741599128: 0x004c000000dc0f07 TX message ept 7, tag f, opcode dc, param 0, data 4c0000 288741620732: 0x0000000000000000 RX interrupt 288741620900: 0x002c000000dc8f07 RX message ept 7, tag 8f, opcode dc, param 0, data 2c0000 288742902624: 0x0000000000130000 TX message ept 0, tag 0, opcode 13, param 0, data 0 288742912320: 0x0000000000000000 RX interrupt 288742912496: 0x0000000000110000 RX message ept 0, tag 0, opcode 11, param 0, data 0 288742913700: 0x0000000000120000 TX message ept 0, tag 0, opcode 12, param 0, data 0 289344354176: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289344354216: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 289344381416: 0x0000000000000000 TX message ept 0, tag 0, opcode 0, param 0, data 0 ./seputil --boot-check sep-firmware.img4 preflight: manifest hash matches sepi bootCheck: SEP may boot with ART ./seputil --dump-fw sep-firmware.img4 manifest digest (20 bytes): 519c0248f04d316a3d71e03978b4126fbfb2b15c sepi digest (20 bytes): a22813c5ceaeada5b7eeaa55808f3019814e8b8e sepi nonce (20 bytes): e5074bd1befefc685c6b5ec6797ffc851366f76f rsep digest (20 bytes): cb9f4c6520889e2582414c5969fb0abc3b0d8277 rsep nonce (20 bytes): e5074bd1befefc685c6b5ec6797ffc851366f76f
jtool dissect
./jtool -l /Volumes/ramdisk/usr/libexec/seputil LC 00: LC_SEGMENT_64 Mem: 0x000000000-0x100000000 __PAGEZERO LC 01: LC_SEGMENT_64 Mem: 0x100000000-0x100008000 __TEXT 0x0000000100000ce8-0x00000001000055e0 __TEXT.__text 0x00000001000055e0-0x00000001000058ec __TEXT.__stubs 0x00000001000058ec-0x0000000100005c10 __TEXT.__stub_helper 0x0000000100005c10-0x0000000100006e5d __TEXT.__cstring 0x0000000100006e60-0x0000000100007fac __TEXT.__const 0x0000000100007fac-0x0000000100007ff4 __TEXT.__unwind_info LC 02: LC_SEGMENT_64 Mem: 0x100008000-0x10000c000 __DATA 0x0000000100008000-0x0000000100008050 __DATA.__got 0x0000000100008050-0x0000000100008258 __DATA.__la_symbol_ptr 0x0000000100008258-0x00000001000086e8 __DATA.__const 0x00000001000086e8-0x0000000100008990 __DATA.__data 0x0000000100008990-0x00000001000089b0 __DATA.__bss LC 03: LC_SEGMENT_64 Mem: 0x10000c000-0x100010000 __LINKEDIT LC 04: LC_DYLD_INFO_ONLY LC 05: LC_SYMTAB Symbol table is at offset 0xd9c8, with 77 entries LC 06: LC_DYSYMTAB LC 07: LC_LOAD_DYLINKER /usr/lib/dyld LC 08: LC_UUID UUID: 5C06A94F-63A7-3150-95B6-65567C70A3C8 LC 09: LC_VERSION_MIN_IPHONEOS Minimum iOS version: 7.0.0 LC 10: LC_SOURCE_VERSION Source Version: 69.1.1.0.0 LC 11: LC_MAIN Entry Point: 0x1448 (Mem: 100001448) LC 12: LC_LOAD_DYLIB /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation LC 13: LC_LOAD_DYLIB /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit LC 14: LC_LOAD_DYLIB /usr/lib/libSystem.B.dylib LC 15: LC_FUNCTION_STARTS Offset: 55592, Size: 120 LC 16: LC_DATA_IN_CODE Offset: 55712, Size: 0 LC 17: LC_DYLIB_CODE_SIGN_DRS Offset: 55712, Size: 40 LC 18: LC_CODE_SIGNATURE Offset: 58704, Size: 480
ART Object
Example 1:
./seputil --art get raw ART: 305e0201003037020218340414519c0248f04d316a3d71e03978b4126fbfb2b15c0400041467fc18385630dc6429726677d196c81466f47b5e3103c00100042027b6dadbab356612997af0203cefeae51fe90cd985ee7cdd6211c766b8cc7a60 Successfully parsed ART: counter: 6196 manifest hash (20 bytes): 519c0248f04d316a3d71e03978b4126fbfb2b15c sleep hash is absent restore nonce (20 bytes): 67fc18385630dc6429726677d196c81466f47b5e
raw ART is also a DER encoded ASN.1 object:
30 — type tag indicating SEQUENCE
5e — length in octets of value that follows (92)
02 — type tag indicating INTEGER
01 — length in octets of value that follows
00 — value (0)
30 — type tag indicating SEQUENCE
37 — length in octets of value that follows (55)
02 — type tag indicating INTEGER
02 — length in octets of value that follows
1834 — value (6196) (of counter)
04 — type tag indicating STRING
14 — length in octets of value that follows (20)
519c0248f04d316a3d71e03978b4126fbfb2b15c — value (of manifest hash)
04 — type tag indicating STRING
00 — length in octets of value that follows (0); empty, so no value to follow (sleep hash is absent)
04 — type tag indicating STRING
14 — length in octets of value that follows (20)
67fc18385630dc6429726677d196c81466f47b5e — value (of restore nonce: snon)
31 — type tag indicating SET (of subcounters)
03 — length in octets of value that follows (3)
c00100 — value (priv element [0]=0)
04 — type tag indicating STRING
20 — length in octets of value that follows (32)
27b6dadbab356612997af0203cefeae51fe90cd985ee7cdd6211c766b8cc7a60 — value (SHA-256 HMAC of the previous SEQUENCE)
Example 2:
./seputil --art get raw ART: 3072020100304b0202186c0414519c0248f04d316a3d71e03978b4126fbfb2b15c04147f75cb9012128cf71eb8fcd6b13e56a02a7324db041467fc18385630dc6429726677d196c81466f47b5e3103c0010004209ce3646167631d0df8d4db28973db8d5a27f85d345ad6ec220aeb1e22f39f31f Successfully parsed ART: counter: 6252 manifest hash (20 bytes): 519c0248f04d316a3d71e03978b4126fbfb2b15c sleep hash (20 bytes): 7f75cb9012128cf71eb8fcd6b13e56a02a7324db restore nonce (20 bytes): 67fc18385630dc6429726677d196c81466f47b5e
Decode (used the decoder here):
SEQUENCE (3 elem)
INTEGER 0
SEQUENCE (5 elem)
INTEGER 6252
OCTET STRING (20 byte) 519C0248F04D316A3D71E03978B4126FBFB2B15C
OCTET STRING (20 byte) 7F75CB9012128CF71EB8FCD6B13E56A02A7324DB
OCTET STRING (20 byte) 67FC18385630DC6429726677D196C81466F47B5E
SET (1 elem)
Private 0 (1 byte) 00
OCTET STRING (32 byte) 9CE3646167631D0DF8D4DB28973DB8D5A27F85D345AD6EC220AEB1E22F39F31F
Example 3:
Don't try this at home kids!
DESTRUCTIVE - WILL BRICK SOME LEGACY DEVICES!!!
./seputil --art clear ART cleared from storage ./seputil --art get seputil: Get ART command error: 0xe00002bc
