config RSA bool "Use RSA Library" select RSA_FREESCALE_EXP if FSL_CAAM && !ARCH_MX7 && !ARCH_MX6 && !ARCH_MX5 select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP help RSA support. This enables the RSA algorithm used for FIT image verification in U-Boot. See doc/uImage.FIT/signature.txt for more details. The Modular Exponentiation algorithm in RSA is implemented using driver model. So CONFIG_DM needs to be enabled by default for this library to function. The signing part is build into mkimage regardless of this option. The software based modular exponentiation is built into mkimage irrespective of this option. config SPL_RSA bool "Use RSA Library within SPL" depends on RSA if RSA config RSA_SOFTWARE_EXP bool "Enable driver for RSA Modular Exponentiation in software" depends on DM && RSA help Enables driver for modular exponentiation in software. This is a RSA algorithm used in FIT image verification. It required RSA Key as input. See doc/uImage.FIT/signature.txt for more details. config RSA_FREESCALE_EXP bool "Enable RSA Modular Exponentiation with FSL crypto accelerator" depends on DM && RSA && FSL_CAAM && !ARCH_MX7 && !ARCH_MX6 && !ARCH_MX5 help Enables driver for RSA modular exponentiation using Freescale cryptographic accelerator - CAAM. config RSA_N_SIZE hex "Define the RSA N size" help The value is depended on different platforms. The RV1126/RV1109 is set to 0x100. The RK3568/RK3566 is set to 0x200. config RSA_E_SIZE hex "Define the RSA E size" help The value is depended on different platforms. The RV1126/RV1109 is set to 0x100. The RK3568/RK3566 is set to 0x10. config RSA_C_SIZE hex "Define the RSA C size" help The value is depended on different platforms.The RV1126/RV1109 is set to 0x14. The RK3568/RK3566 is set to 0x20. endif