CAAM is a cryptographic accelerator and assurance module. CAAM implements several encryption and hashing functions, a run-time integrity checker,entropy source generator, and a Pseudo Random Number Generator (PRNG). The PRNG is certifiable by the Cryptographic Algorithm Validation Program (CAVP) of the National Institute of Standards and Technology (NIST). CAAM also implements a Secure Memory mechanism. In i.MX 8M Dual / 8M QuadLite / 8M Quad processors, the secure memory provided is 32 KB.
i.MX8 processor with CAAM security functions are enabled and accelerated by hardware,CAAM is the chip's cryptographic acceleration and assurance module, which serves as NXP's latest cryptographic acceleration and offloading hardware. It combines functionspreviously implemented in separate modules to create a modular and scalable acceleration and assurance engine. It also implements block encryption algorithms, stream cipher algorithms, hashing algorithms, public key algorithms, run-time integrity checking, a secure memory controller, and a hardware random number generator.
CAAM supports the following key features:
• PKHA block to support Public Key Cryptography with RSA 4096 and ECC algorithms
• 3 Job Rings
• RTIC (real time integrity checking)
• AES, DES, 3DES with Side channel attack resistance
• Widevine cipher text stealing (AES-CBC-CTS mode)
• PlayReady content protection
In order to provide better video content protection, CAAM also supports the domain based resource protection.Kernel Configuration
You can manage the CAAM support through the following kernel configuration options:
.config - Linux/arm64 4.14.78 Kernel Configuration
→ Cryptographic API → Hardware crypto devices → Freescale CAAM Job Ring driver backend
which are enabled as built-in on the default kernel configuration file.
Configuration file
source/arch/arm64/configs/seco_imx8mq_defconfig
CONFIG_CRYPTO_DEV_FSL_CAAM=y
CONFIG_CRYPTO_DEV_FSL_CAAM_SM=y
CONFIG_CRYPTO_DEV_FSL_CAAM_SM_TEST=y
CONFIG_CRYPTO_DEV_FSL_CAAM_SECVIO=y
CONFIG_ARM64_CRYPTO=y
The CAAM drivers are located at drivers/crypto/caam:
| File | Description |
|---|---|
| ctrl.c | CAAM control-plane driver backend |
| caamalg.c | CAAM support for crypto API |
| jr.c | CAAM/SEC 4.x functions for handling key-generation jobs |
| caamhash.c | CAAM support for hash functions of crypto API |
| caamrng.c | CAAM support for hw_random |
| sm_store.c | CAAM secure memory storage interface |
| secvio.c | SNVS security violation handler |
| key_gen.c | CAAM/SEC 4.x functions for handling key-generation jobs |
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The CAAM device tree binding is documented at kernel_source/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
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Cryptographic authenticationYou can list the encryption algorithms supported by the system with cat /proc/crypto:
For each algorithm you get a set of properties, including:
Download salix cameras. name: the name of the algorithmdriver: the driver that provides this support. If the driver contains caam it means the CAAM hardware engine provides support for this encryption algorithm.priority: the higher the value, the higher the priority. Normally hardware-accelerated algorithms have higher priority over software algorithms.To verify if an encryption or hashing operation is using the CAAM, you can check the interruption count for the jr (job ring) devices. The example below shows how the interruption count for 30902000.jr1 increases when performing AES CBC encryption with OpenSSL (which uses the CAAM).
Drivers Second Hand
For DTSI as follow the Job ring
Log as follow
Drivers Second Hand Cars