30 Aug
2024
30 Aug
'24
4:42 p.m.
Le 30/08/2024 à 18:14, Jason A. Donenfeld a écrit :
On Fri, Aug 30, 2024 at 05:57:08PM +0200, Christophe Leroy wrote:
- r5: 8-byte counter input/output (saved on stack)
- r14-r15: counter
- */
+SYM_FUNC_START(__arch_chacha20_blocks_nostack)
- stwu r1, -96(r1)
- stw r5, 20(r1)
- stmw r14, 24(r1)
- li r31, 4
- LWZX_LE r14, 0, r5
- LWZX_LE r15, r31, r5
Why swap endian on the counter?
Unlike the keys, the counter is passed to the function as an u8*, not as a u64*, so I thought it was raw data in little endian order, same as when using Sodium. Is it wrong ?
Christophe