Do CMA Key Derivation offline

[LiEnby]

Now with the F00D Keys its possible to do the CMA key derivation without needing cma.henkaku.xyz,

here's a little implementation i wrote : https://bitbucket.org/SilicaAndPina/cmakeyderiv
based off what i read from the Wiki: https://wiki.henkaku.xyz/vita/PSVIMG#PSVIMG_Key_Derivation

[soarqin]

It really helps, thank u very much, I'd look into this later

[soarqin]

    void cmakeygen(uint8_t input[8], uint8_t output[32]) {
        static const uint8_t passphrase[] = "Sri Jayewardenepura Kotte";
        static const uint8_t key[] = { 0xA9,0xFA,0x5A,0x62,0x79,0x9F,0xCC,0x4C,0x72,0x6B,0x4E,0x2C,0xE3,0x50,0x6D,0x38 };
        sha256_context ctx;
        aes_context aes;
        sha256_init(&ctx);
        sha256_starts(&ctx);
        sha256_update(&ctx, input, 8);
        sha256_update(&ctx, passphrase, 25);
        sha256_final(&ctx, output);
        aes_init_dec(&aes, key, 128);
        aes_ecb_decrypt(&aes, output, output);
        aes_ecb_decrypt(&aes, output + 16, output + 16);
    }

test codes (using scrpto lib from finalhe), working fine, will integrate this into finalhe asap