diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/crypto/chacha-neon-core.S | 97 |
1 files changed, 90 insertions, 7 deletions
diff --git a/arch/arm/crypto/chacha-neon-core.S b/arch/arm/crypto/chacha-neon-core.S index eb22926d4912..13d12f672656 100644 --- a/arch/arm/crypto/chacha-neon-core.S +++ b/arch/arm/crypto/chacha-neon-core.S @@ -47,6 +47,7 @@ */ #include <linux/linkage.h> +#include <asm/cache.h> .text .fpu neon @@ -205,7 +206,7 @@ ENDPROC(hchacha_block_neon) .align 5 ENTRY(chacha_4block_xor_neon) - push {r4-r5} + push {r4, lr} mov r4, sp // preserve the stack pointer sub ip, sp, #0x20 // allocate a 32 byte buffer bic ip, ip, #0x1f // aligned to 32 bytes @@ -229,10 +230,10 @@ ENTRY(chacha_4block_xor_neon) vld1.32 {q0-q1}, [r0] vld1.32 {q2-q3}, [ip] - adr r5, .Lctrinc + adr lr, .Lctrinc vdup.32 q15, d7[1] vdup.32 q14, d7[0] - vld1.32 {q4}, [r5, :128] + vld1.32 {q4}, [lr, :128] vdup.32 q13, d6[1] vdup.32 q12, d6[0] vdup.32 q11, d5[1] @@ -455,7 +456,7 @@ ENTRY(chacha_4block_xor_neon) // Re-interleave the words in the first two rows of each block (x0..7). // Also add the counter values 0-3 to x12[0-3]. - vld1.32 {q8}, [r5, :128] // load counter values 0-3 + vld1.32 {q8}, [lr, :128] // load counter values 0-3 vzip.32 q0, q1 // => (0 1 0 1) (0 1 0 1) vzip.32 q2, q3 // => (2 3 2 3) (2 3 2 3) vzip.32 q4, q5 // => (4 5 4 5) (4 5 4 5) @@ -493,6 +494,8 @@ ENTRY(chacha_4block_xor_neon) // Re-interleave the words in the last two rows of each block (x8..15). vld1.32 {q8-q9}, [sp, :256] + mov sp, r4 // restore original stack pointer + ldr r4, [r4, #8] // load number of bytes vzip.32 q12, q13 // => (12 13 12 13) (12 13 12 13) vzip.32 q14, q15 // => (14 15 14 15) (14 15 14 15) vzip.32 q8, q9 // => (8 9 8 9) (8 9 8 9) @@ -520,41 +523,121 @@ ENTRY(chacha_4block_xor_neon) // XOR the rest of the data with the keystream vld1.8 {q0-q1}, [r2]! + subs r4, r4, #96 veor q0, q0, q8 veor q1, q1, q12 + ble .Lle96 vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2]! + subs r4, r4, #32 veor q0, q0, q2 veor q1, q1, q6 + ble .Lle128 vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2]! + subs r4, r4, #32 veor q0, q0, q10 veor q1, q1, q14 + ble .Lle160 vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2]! + subs r4, r4, #32 veor q0, q0, q4 veor q1, q1, q5 + ble .Lle192 vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2]! + subs r4, r4, #32 veor q0, q0, q9 veor q1, q1, q13 + ble .Lle224 vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2]! + subs r4, r4, #32 veor q0, q0, q3 veor q1, q1, q7 + blt .Llt256 +.Lout: vst1.8 {q0-q1}, [r1]! vld1.8 {q0-q1}, [r2] - mov sp, r4 // restore original stack pointer veor q0, q0, q11 veor q1, q1, q15 vst1.8 {q0-q1}, [r1] - pop {r4-r5} - bx lr + pop {r4, pc} + +.Lle192: + vmov q4, q9 + vmov q5, q13 + +.Lle160: + // nothing to do + +.Lfinalblock: + // Process the final block if processing less than 4 full blocks. + // Entered with 32 bytes of ChaCha cipher stream in q4-q5, and the + // previous 32 byte output block that still needs to be written at + // [r1] in q0-q1. + beq .Lfullblock + +.Lpartialblock: + adr lr, .Lpermute + 32 + add r2, r2, r4 + add lr, lr, r4 + add r4, r4, r1 + + vld1.8 {q2-q3}, [lr] + vld1.8 {q6-q7}, [r2] + + add r4, r4, #32 + + vtbl.8 d4, {q4-q5}, d4 + vtbl.8 d5, {q4-q5}, d5 + vtbl.8 d6, {q4-q5}, d6 + vtbl.8 d7, {q4-q5}, d7 + + veor q6, q6, q2 + veor q7, q7, q3 + + vst1.8 {q6-q7}, [r4] // overlapping stores + vst1.8 {q0-q1}, [r1] + pop {r4, pc} + +.Lfullblock: + vmov q11, q4 + vmov q15, q5 + b .Lout +.Lle96: + vmov q4, q2 + vmov q5, q6 + b .Lfinalblock +.Lle128: + vmov q4, q10 + vmov q5, q14 + b .Lfinalblock +.Lle224: + vmov q4, q3 + vmov q5, q7 + b .Lfinalblock +.Llt256: + vmov q4, q11 + vmov q5, q15 + b .Lpartialblock ENDPROC(chacha_4block_xor_neon) + + .align L1_CACHE_SHIFT +.Lpermute: + .byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 + .byte 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f + .byte 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 + .byte 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f + .byte 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 + .byte 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f + .byte 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 + .byte 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f |