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AN3270 Datasheet(PDF) 2 Page - STMicroelectronics |
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AN3270 Datasheet(HTML) 2 Page - STMicroelectronics |
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2 / 23 page ![]() Contents AN3270 2/23 Doc ID 17919 Rev 2 Contents 1 AES hardware accelerator operation modes . . . . . . . . . . . . . . . . . . . . . 3 1.1 AES encryption mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Key derivation mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.3 AES decryption mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4 Key derivation and decryption mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.5 Decryption mode vs. key derivation and decryption mode . . . . . . . . . . . . 12 2 AES peripheral driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 AES block processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.1 AES block padding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 AES block chaining: CBC as an example . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.3 Using the software implementation of AES chaining modes . . . . . . . . . . 17 3.4 Some recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 |
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