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It sounds like it is built into hardware with newer iPhones containing the secure enclave, but not for an older phone like the iPhone 5C.

• thesmok 11y ago
  I'm really interested to know more about this. Does TouchId secure enclave really enforce the password attempt limits?
  • germanier 11y ago
    Yes, see page 12 here https://www.apple.com/business/docs/iOS_Security_Guide.pdf https://www.apple.com/business/docs/iOS_Security_Guide.pdf
    • nly 11y ago
      Its really a pretty impressive design. Android phones are lacking here.
• andreyvit 11y ago
  It's not really built into ‘hardware’, it's enforced by the Secure Enclave, which is software-based and accepts software updates signed by Apple. It's secure against kernel exploits and third-parties, but not against Apple.