CRYP internal peripheral

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Applicable for

STM32MP13x lines, STM32MP15x lines

1 Article purpose[edit source]

The purpose of this article is to:

briefly introduce the CRYP peripheral and its main features
indicate the level of security supported by this hardware block
explain how each instance can be allocated to the runtime contexts and linked to the corresponding software components
explain how to configure the CRYP peripheral.

2 Peripheral overview[edit source]

The CRYP peripheral provides hardware acceleration to encrypt or decrypt data using the DES^[1], TDES^[2] or AES^[3] algorithms. It also supports multiple key sizes and chaining modes.

2.1 Features[edit source]

Refer to STM32MP13 reference manuals or STM32MP15 reference manuals for the complete list of features, and to the software components, introduced below, to see which features are implemented.

2.2 Security support[edit source]

2.2.1 On STM32MP13x lines [edit source]

CRYP is a secure peripheral (under ETZPC control).

2.2.2 On STM32MP15x lines [edit source]

CRYP1 is a secure peripheral (under ETZPC control).
CRYP2 is a non secure peripheral.

3 Peripheral usage and associated software[edit source]

3.1 Boot time[edit source]

3.1.1 On STM32MP13x lines [edit source]

CRYP could be used in ROM code during boot process for FSBL decryption.

3.1.2 On STM32MP15x lines [edit source]

CRYP peripheral is not used during boot process.

3.2 Runtime[edit source]

3.2.1 Overview[edit source]

3.2.1.1 On STM32MP13x lines [edit source]

CRYP instance can be allocated to:

the Arm^® Cortex^®-A7 secure core to be controlled in OP-TEE by the CRYP OP-TEE driver

or

The Arm^® Cortex^® -A7 non-secure for using in Linux^® with Linux Crypto framework

Chapter Peripheral assignment describes which peripheral instance can be assigned to which context.

3.2.1.2 On STM32MP15x lines [edit source]

CRYP1 instance can be allocated to:

the Arm^® Cortex^®-A7 secure core to be controlled in OP-TEE by the CRYP OP-TEE driver

or

The Arm^® Cortex^® -A7 non-secure for using in Linux^® with Linux Crypto framework

CRYP2 instance can be allocated to:

the Arm^® Cortex^®-M4 to be controlled in STM32Cube MPU Package by STM32Cube CRYP driver

Chapter Peripheral assignment describes which peripheral instance can be assigned to which context.

3.2.2 Software frameworks[edit source]

3.2.2.1 On STM32MP13x lines [edit source]

Domain	Peripheral	Software components		Comment
Domain	Peripheral	OP-TEE	Linux	Comment
Security	CRYP	CRYP OP-TEE driver	Linux Crypto framework

3.2.2.2 On STM32MP15x lines [edit source]

Domain	Peripheral	Software components			Comment
Domain	Peripheral	OP-TEE	Linux	STM32Cube	Comment
Security	CRYP	CRYP OP-TEE driver	Linux Crypto framework	STM32Cube CRYP driver

3.2.3 Peripheral configuration[edit source]

The configuration is applied by the firmware running in the context to which the peripheral is assigned. The configuration can be done alone via the STM32CubeMX tool for all internal peripherals, and then manually completed (particularly for external peripherals), according to the information given in the corresponding software framework article.

3.2.4 Peripheral assignment[edit source]

3.2.4.1 On STM32MP13x lines [edit source]

Click on the right to expand the legend...

Check boxes illustrate the possible peripheral allocations supported by STM32 MPU Embedded Software:

☐ means that the peripheral can be assigned (☑) to the given runtime context.
⬚ means that the peripheral can be assigned to the given runtime context, but this configuration is not supported in STM32 MPU Embedded Software distribution.
✓ is used for system peripherals that cannot be unchecked because they are statically connected in the device.

Refer to How to assign an internal peripheral to an execution context for more information on how to assign peripherals manually or via STM32CubeMX.
The present chapter describes STMicroelectronics recommendations or choice of implementation. Additional possiblities might be described in STM32MP13 reference manuals.

Domain	Peripheral	Runtime allocation			Comment
Domain	Peripheral	Instance	Cortex-A7 secure (OP-TEE)	Cortex-A7 non-secure (Linux)	Comment
Security	CRYP	CRYP	☐	☐	Assignment (single choice)

3.2.4.2 On STM32MP15x lines [edit source]

Click on the right to expand the legend...

STM32MP15 internal peripherals

Check boxes illustrate the possible peripheral allocations supported by STM32 MPU Embedded Software:

☐ means that the peripheral can be assigned (☑) to the given runtime context.
⬚ means that the peripheral can be assigned to the given runtime context, but this configuration is not supported in STM32 MPU Embedded Software distribution.
✓ is used for system peripherals that cannot be unchecked because they are statically connected in the device.

Refer to How to assign an internal peripheral to an execution context for more information on how to assign peripherals manually or via STM32CubeMX.
The present chapter describes STMicroelectronics recommendations or choice of implementation. Additional possiblities might be described in STM32MP15 reference manuals.

Domain	Peripheral	Runtime allocation				Comment
Domain	Peripheral	Instance	Cortex-A7 secure (OP-TEE)	Cortex-A7 non-secure (Linux)	Cortex-M4 (STM32Cube)	Comment
Security	CRYP	CRYP1	☐	☐		Assignment (single choice)
Security	CRYP	CRYP2			☐

4 References[edit source]

[1] ttps://en.wikipedia.org/wiki/Data_Encryption_Standard

[2] ttps://en.wikipedia.org/wiki/Triple_DES

[3] ttps://en.wikipedia.org/wiki/Advanced_Encryption_Standard

[1]

[2]

[3]