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Difference between revisions of "Secure Enclave"
(SEP is used for more than just Touch ID) |
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| − | The '''Secure Enclave''' is part of the [[A7]] |
+ | The '''Secure Enclave''' is part of the [[A7]] and newer chips used for data protection, [[Touch ID]], and [[Face ID]]. The purpose of the Secure Enclave is to handle keys and other info such as biometrics that is sensitive enough to not be handled by the [[Application Processor|AP]]. It is isolated with a hardware filter so the AP cannot access it. It shares RAM with the AP, but it's portion of the RAM (known as TZ0) is encrypted. The secure enclave itself is a flashable 4MB AKF processor core called the secure enclave processor (SEP) as documented in [http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220130308838%22.PGNR.&OS=DN/20130308838&RS=DN/20130308838 Apple Patent Application 20130308838]. The technology used is similar to [http://www.arm.com/products/processors/technologies/trustzone/index.php ARM's TrustZone/SecurCore] but contains proprietary code for Apple KF cores in general and SEP specifically. It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest. |
| + | The SEP is located in the devicetree under IODeviceTree:/arm-io/sep and manged by the AppleSEPManager driver as seen [http://winocm.com/images/ioregdump.txt here] |
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| − | The SEP has its on OS (called SEP OS) and there exists a tool called seputil which is used to communicate with it. |
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| + | ==SEP OS== |
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| − | seputil has the following valid commands: |
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| + | The SEP has its own OS called SEP OS and there exists a tool called [[seputil]] which is used to communicate with it. |
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| − | <pre> |
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| − | --ping Send a PING operation to the SEP OS |
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| − | --load Load <file> as the SEP runtime firmware |
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| − | --restore Load <file> as the SEP runtime firmware in restore mode |
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| − | --restore+art Load <file> as the SEP runtime firmware in restore mode with ART |
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| − | --wait Pause for kernel driver to load before failing |
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| − | --preflight Pre-flight load/restore firmware against ART to pre-check for boot failures |
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| − | --log Dump the mailbox message log |
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| − | --rom status Get the ROM status |
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| − | --rom tz0 Send a ROM TZ0 command |
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| − | --rom nop Send a ROM NOP command |
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| − | --rom nonce Send a ROM nonce request |
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| − | --new-nonce Request new SEP/OS nonce |
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| − | --kill-nonce Request invalidate SEP/OS nonce |
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| − | --art get Dump current ART from Memory |
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| − | --art set Persist the supplied ART to storage |
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| − | --art clear Clear the persisted ART |
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| − | --art ctrtest Counter self-test (DESTRUCTIVE - WILL BRICK DEVICE) |
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| − | --sleep Sleep the SEP NOW! |
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| − | --nap Nap the SEP NOW! |
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| − | --pingflood Ping SEP endlessly |
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| − | --clkgate Enable SEP clock gating |
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| − | --get <obj> Read obj and write to stdout |
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| − | --put <obj> Read stdin and write to obj |
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| − | --boot-check <file> Check whether a firmware might be bootable WRT the current ART |
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| − | --dump-fw <file> Dump measurements of firmware file |
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| − | </pre> |
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==Further References== |
==Further References== |
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Revision as of 02:00, 4 August 2018
The Secure Enclave is part of the A7 and newer chips used for data protection, Touch ID, and Face ID. The purpose of the Secure Enclave is to handle keys and other info such as biometrics that is sensitive enough to not be handled by the AP. It is isolated with a hardware filter so the AP cannot access it. It shares RAM with the AP, but it's portion of the RAM (known as TZ0) is encrypted. The secure enclave itself is a flashable 4MB AKF processor core called the secure enclave processor (SEP) as documented in Apple Patent Application 20130308838. The technology used is similar to ARM's TrustZone/SecurCore but contains proprietary code for Apple KF cores in general and SEP specifically. It is also responsible for generating the UID key on A9 or newer chips that protects user data at rest.
The SEP is located in the devicetree under IODeviceTree:/arm-io/sep and manged by the AppleSEPManager driver as seen here
SEP OS
The SEP has its own OS called SEP OS and there exists a tool called seputil which is used to communicate with it.
