Git-Mirrors/tillitis-key
1
0
Fork 0
mirror of https://github.com/tillitis/tillitis-key1.git synced 2024-10-01 01:45:38 -04:00
Code Issues Packages Projects Releases Wiki Activity

Remove redundant RAM address and data scrambling

Browse Source 
The RAM address and data scrambling API was called twice, once before filling
RAM with random values, and once after. Since moving to a significantly
better PRNG (xorwow) this is now deemed unnecessary. See issue #225.

This changes both FPGA and firmware hashes.
This commit is contained in:
dehanj 2024-06-12 15:12:09 +02:00
parent 92712a11bf
commit b4c525695a
No known key found for this signature in database
GPG Key ID: 3707A9DBF4BB8F1A
3 changed files with 3 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hw/application_fpga/application_fpga.bin.sha256
View File

@ -1 +1 @@
c0da9e30042b87e0acbb01c9faf135b604f3f3b8cc1c7f7cc426d926bba785c1 application_fpga.bin
809eedf8a582b2b985292ea35102b6dd23c501202ea1c9c3b13dfdb4ff934e8e application_fpga.bin

2
hw/application_fpga/firmware.bin.sha512
View File

@ -1 +1 @@
d14bc9d8366505bc6f3312991d49ce7fe07d472fc936f4fabde4bf7d8775bde576268c79579d60f83e79de173a4217e00ecb1e04178db621cf9f332315485a73 firmware.bin
edb39fca7dafb8ea0b89fdeecd960d7656e14ce461e49af97160a8bd6e67d9987e816adad37ba0fcfa63d107c3160988e4c3423ce4a71c39544bc0045888fec1 firmware.bin

7
hw/application_fpga/fw/tk1/main.c
View File

@ -377,10 +377,6 @@ static void scramble_ram(void)
{
uint32_t *ram = (uint32_t *)(TK1_RAM_BASE);
// Set RAM address and data scrambling values
*ram_rand = rnd_word();
*ram_scramble = rnd_word();
// Fill RAM with random data
// Get random state and accumulator seeds.
uint32_t data_state = rnd_word();
@ -391,8 +387,7 @@ static void scramble_ram(void)
ram[w] = data_state;
}
// Set new address and RAM scrambling values,
// for all use of RAM by app.
// Set RAM address and data scrambling parameters
*ram_rand = rnd_word();
*ram_scramble = rnd_word();
}