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subghz_keystore_mess_with_iv shortened

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- less instructions
- less registers used (no need for r3 anymore)
This commit is contained in:
improving-rigmarole
2021-11-25 01:20:26 +01:00
parent 2db5eee03b
commit 7b46c12e40
1 changed files with 3 additions and 5 deletions
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8
lib/subghz/subghz_keystore.c
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@@ -84,19 +84,17 @@ static void subghz_keystore_mess_with_iv(uint8_t* iv) {
asm volatile("movs r0, #0x0 \n"
"movs r1, #0x0 \n"
"movs r2, #0x0 \n"
"movs r3, #0x0 \n"
"nani: \n"
"ldrb r1, [r0, %0]\n"
"mov r2, r1 \n"
"add r1, r3 \n"
"mov r3, r2 \n"
"add r1, r2 \n"
"rsb r2, r1 \n"
"strb r1, [r0, %0]\n"
"adds r0, #0x1 \n"
"cmp r0, #0xF \n"
"bls nani \n"
:
: "r"(iv)
: "r0", "r1", "r2", "r3", "memory");
: "r0", "r1", "r2", "memory");
}
static bool subghz_keystore_read_file(SubGhzKeystore* instance, File* file, uint8_t* iv) {