diff options
| author | René van Dorst <opensource@vdorst.com> | 2018-05-30 17:23:10 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2018-05-31 01:24:51 +0200 |
| commit | 9b204d0ebdb6706bb055ade6fa36d73c7a69ef0e (patch) | |
| tree | d1bb78ed5744180e0a6826124fe0a61ac69bde4f | |
| parent | 031e92bbe4543d5d158ee4f9668201004141c4df (diff) | |
poly1305: mips: compute S on fly
This reduces memory access and the total opaque size.
Signed-off-by: René van Dorst <opensource@vdorst.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | src/crypto/poly1305-mips.S | 53 |
1 files changed, 22 insertions, 31 deletions
diff --git a/src/crypto/poly1305-mips.S b/src/crypto/poly1305-mips.S index cd62d9b..32d8558 100644 --- a/src/crypto/poly1305-mips.S +++ b/src/crypto/poly1305-mips.S @@ -44,10 +44,12 @@ #define srclen $a2 #define hibit $a3 +/* Location in the opaque buffer + * R[0..3], CA, H[0..4] + */ #define PTR_POLY1305_R(n) ( 0 + (n*4)) ## ($a0) -#define PTR_POLY1305_S(n) (16 + (n*4)) ## ($a0) -#define PTR_POLY1305_CA (32 ) ## ($a0) -#define PTR_POLY1305_H(n) (36 + (n*4)) ## ($a0) +#define PTR_POLY1305_CA (16 ) ## ($a0) +#define PTR_POLY1305_H(n) (20 + (n*4)) ## ($a0) #define POLY1305_BLOCK_SIZE 16 #define POLY1305_STACK_SIZE 8 * 4 @@ -86,10 +88,6 @@ poly1305_blocks_mips: sw $s4, 16($sp) sw $s5, 20($sp) - lw S1, PTR_POLY1305_S(1) - lw S2, PTR_POLY1305_S(2) - lw S3, PTR_POLY1305_S(3) - /* load Hx and Carry */ lw CA, PTR_POLY1305_CA lw H0, PTR_POLY1305_H(0) @@ -98,6 +96,14 @@ poly1305_blocks_mips: lw H3, PTR_POLY1305_H(3) lw H4, PTR_POLY1305_H(4) + /* Sx = Rx + (Rx >> 2) */ + srl S1, R1, 2 + srl S2, R2, 2 + srl S3, R3, 2 + addu S1, R1 + addu S2, R2 + addu S3, R3 + addiu SC, $zero, 1 .Lpoly1305_loop: @@ -352,9 +358,6 @@ poly1305_emit_mips: #define PR2 $t2 #define PR3 $t3 #define PT0 $t4 -#define PS1 $t5 -#define PS2 $t6 -#define PS3 $t7 /* Input arguments CTX=$a0, KEY=$a1 */ @@ -371,6 +374,14 @@ poly1305_init_mips: lwr PR2, 8+LSB($a1) lwr PR3,12+LSB($a1) + /* store Hx and Carry */ + sw $zero, PTR_POLY1305_CA + sw $zero, PTR_POLY1305_H(0) + sw $zero, PTR_POLY1305_H(1) + sw $zero, PTR_POLY1305_H(2) + sw $zero, PTR_POLY1305_H(3) + sw $zero, PTR_POLY1305_H(4) + #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ wsbh PR0 wsbh PR1 @@ -382,14 +393,6 @@ poly1305_init_mips: rotr PR3, 16 #endif - /* store Hx and Carry */ - sw $zero, PTR_POLY1305_CA - sw $zero, PTR_POLY1305_H(0) - sw $zero, PTR_POLY1305_H(1) - sw $zero, PTR_POLY1305_H(2) - sw $zero, PTR_POLY1305_H(3) - sw $zero, PTR_POLY1305_H(4) - lui PT0, 0x0FFF ori PT0, 0xFFFC @@ -401,26 +404,14 @@ poly1305_init_mips: and PR2, PT0 and PR3, PT0 - srl PS1, PR1, 2 - srl PS2, PR2, 2 - srl PS3, PR3, 2 - addu PS1, PR1 - addu PS2, PR2 - addu PS3, PR3 - /* store Rx */ sw PR0, PTR_POLY1305_R(0) sw PR1, PTR_POLY1305_R(1) sw PR2, PTR_POLY1305_R(2) - sw PR3, PTR_POLY1305_R(3) - - /* store Sx */ - sw PS1, PTR_POLY1305_S(1) - sw PS2, PTR_POLY1305_S(2) .set noreorder /* Jump Back */ jr $ra - sw PS3, PTR_POLY1305_S(3) + sw PR3, PTR_POLY1305_R(3) .set reorder .end poly1305_init_mips |