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crypto: arm64/ghash-ce - implement 4-way aggregation
Enhance the GHASH implementation that uses 64-bit polynomial multiplication by adding support for 4-way aggregation. This more than doubles the performance, from 2.4 cycles per byte to 1.1 cpb on Cortex-A53. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
8e492eff7d
commit
22240df7ac
@ -46,6 +46,19 @@
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ss3 .req v26
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ss4 .req v27
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XL2 .req v8
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XM2 .req v9
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XH2 .req v10
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XL3 .req v11
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XM3 .req v12
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XH3 .req v13
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TT3 .req v14
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TT4 .req v15
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HH .req v16
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HH3 .req v17
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HH4 .req v18
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HH34 .req v19
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.text
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.arch armv8-a+crypto
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@ -134,11 +147,25 @@
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.endm
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.macro __pmull_pre_p64
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add x8, x3, #16
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ld1 {HH.2d-HH4.2d}, [x8]
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trn1 SHASH2.2d, SHASH.2d, HH.2d
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trn2 T1.2d, SHASH.2d, HH.2d
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eor SHASH2.16b, SHASH2.16b, T1.16b
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trn1 HH34.2d, HH3.2d, HH4.2d
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trn2 T1.2d, HH3.2d, HH4.2d
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eor HH34.16b, HH34.16b, T1.16b
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movi MASK.16b, #0xe1
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shl MASK.2d, MASK.2d, #57
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.endm
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.macro __pmull_pre_p8
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ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
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eor SHASH2.16b, SHASH2.16b, SHASH.16b
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// k00_16 := 0x0000000000000000_000000000000ffff
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// k32_48 := 0x00000000ffffffff_0000ffffffffffff
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movi k32_48.2d, #0xffffffff
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@ -215,8 +242,6 @@
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.macro __pmull_ghash, pn
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ld1 {SHASH.2d}, [x3]
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ld1 {XL.2d}, [x1]
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ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
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eor SHASH2.16b, SHASH2.16b, SHASH.16b
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__pmull_pre_\pn
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@ -224,12 +249,79 @@
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cbz x4, 0f
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ld1 {T1.2d}, [x4]
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mov x4, xzr
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b 1f
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b 3f
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0: ld1 {T1.2d}, [x2], #16
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0: .ifc \pn, p64
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tbnz w0, #0, 2f // skip until #blocks is a
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tbnz w0, #1, 2f // round multiple of 4
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1: ld1 {XM3.16b-TT4.16b}, [x2], #64
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sub w0, w0, #4
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rev64 T1.16b, XM3.16b
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rev64 T2.16b, XH3.16b
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rev64 TT4.16b, TT4.16b
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rev64 TT3.16b, TT3.16b
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ext IN1.16b, TT4.16b, TT4.16b, #8
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ext XL3.16b, TT3.16b, TT3.16b, #8
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eor TT4.16b, TT4.16b, IN1.16b
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pmull2 XH2.1q, SHASH.2d, IN1.2d // a1 * b1
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pmull XL2.1q, SHASH.1d, IN1.1d // a0 * b0
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pmull XM2.1q, SHASH2.1d, TT4.1d // (a1 + a0)(b1 + b0)
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eor TT3.16b, TT3.16b, XL3.16b
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pmull2 XH3.1q, HH.2d, XL3.2d // a1 * b1
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pmull XL3.1q, HH.1d, XL3.1d // a0 * b0
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pmull2 XM3.1q, SHASH2.2d, TT3.2d // (a1 + a0)(b1 + b0)
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ext IN1.16b, T2.16b, T2.16b, #8
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eor XL2.16b, XL2.16b, XL3.16b
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eor XH2.16b, XH2.16b, XH3.16b
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eor XM2.16b, XM2.16b, XM3.16b
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eor T2.16b, T2.16b, IN1.16b
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pmull2 XH3.1q, HH3.2d, IN1.2d // a1 * b1
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pmull XL3.1q, HH3.1d, IN1.1d // a0 * b0
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pmull XM3.1q, HH34.1d, T2.1d // (a1 + a0)(b1 + b0)
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eor XL2.16b, XL2.16b, XL3.16b
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eor XH2.16b, XH2.16b, XH3.16b
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eor XM2.16b, XM2.16b, XM3.16b
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ext IN1.16b, T1.16b, T1.16b, #8
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ext TT3.16b, XL.16b, XL.16b, #8
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eor XL.16b, XL.16b, IN1.16b
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eor T1.16b, T1.16b, TT3.16b
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pmull2 XH.1q, HH4.2d, XL.2d // a1 * b1
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eor T1.16b, T1.16b, XL.16b
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pmull XL.1q, HH4.1d, XL.1d // a0 * b0
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pmull2 XM.1q, HH34.2d, T1.2d // (a1 + a0)(b1 + b0)
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eor XL.16b, XL.16b, XL2.16b
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eor XH.16b, XH.16b, XH2.16b
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eor XM.16b, XM.16b, XM2.16b
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eor T2.16b, XL.16b, XH.16b
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ext T1.16b, XL.16b, XH.16b, #8
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eor XM.16b, XM.16b, T2.16b
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__pmull_reduce_p64
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eor T2.16b, T2.16b, XH.16b
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eor XL.16b, XL.16b, T2.16b
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cbz w0, 5f
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b 1b
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.endif
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2: ld1 {T1.2d}, [x2], #16
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sub w0, w0, #1
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1: /* multiply XL by SHASH in GF(2^128) */
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3: /* multiply XL by SHASH in GF(2^128) */
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CPU_LE( rev64 T1.16b, T1.16b )
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ext T2.16b, XL.16b, XL.16b, #8
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@ -242,7 +334,7 @@ CPU_LE( rev64 T1.16b, T1.16b )
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__pmull_\pn XL, XL, SHASH // a0 * b0
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__pmull_\pn XM, T1, SHASH2 // (a1 + a0)(b1 + b0)
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eor T2.16b, XL.16b, XH.16b
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4: eor T2.16b, XL.16b, XH.16b
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ext T1.16b, XL.16b, XH.16b, #8
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eor XM.16b, XM.16b, T2.16b
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@ -253,7 +345,7 @@ CPU_LE( rev64 T1.16b, T1.16b )
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cbnz w0, 0b
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st1 {XL.2d}, [x1]
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5: st1 {XL.2d}, [x1]
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ret
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.endm
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@ -269,14 +361,10 @@ ENTRY(pmull_ghash_update_p8)
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__pmull_ghash p8
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ENDPROC(pmull_ghash_update_p8)
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KS0 .req v8
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KS1 .req v9
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INP0 .req v10
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INP1 .req v11
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HH .req v12
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XL2 .req v13
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XM2 .req v14
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XH2 .req v15
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KS0 .req v12
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KS1 .req v13
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INP0 .req v14
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INP1 .req v15
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.macro load_round_keys, rounds, rk
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cmp \rounds, #12
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@ -310,8 +398,8 @@ ENDPROC(pmull_ghash_update_p8)
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.endm
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.macro pmull_gcm_do_crypt, enc
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ld1 {HH.2d}, [x4], #16
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ld1 {SHASH.2d}, [x4]
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ld1 {SHASH.2d}, [x4], #16
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ld1 {HH.2d}, [x4]
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ld1 {XL.2d}, [x1]
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ldr x8, [x5, #8] // load lower counter
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@ -33,9 +33,12 @@ MODULE_ALIAS_CRYPTO("ghash");
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#define GCM_IV_SIZE 12
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struct ghash_key {
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u64 a;
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u64 b;
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be128 k;
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u64 h[2];
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u64 h2[2];
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u64 h3[2];
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u64 h4[2];
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be128 k;
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};
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struct ghash_desc_ctx {
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@ -46,7 +49,6 @@ struct ghash_desc_ctx {
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struct gcm_aes_ctx {
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struct crypto_aes_ctx aes_key;
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u64 h2[2];
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struct ghash_key ghash_key;
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};
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@ -63,11 +65,12 @@ static void (*pmull_ghash_update)(int blocks, u64 dg[], const char *src,
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const char *head);
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asmlinkage void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[],
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const u8 src[], u64 const *k, u8 ctr[],
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u32 const rk[], int rounds, u8 ks[]);
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const u8 src[], struct ghash_key const *k,
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u8 ctr[], u32 const rk[], int rounds,
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u8 ks[]);
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asmlinkage void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[],
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const u8 src[], u64 const *k,
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const u8 src[], struct ghash_key const *k,
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u8 ctr[], u32 const rk[], int rounds);
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asmlinkage void pmull_gcm_encrypt_block(u8 dst[], u8 const src[],
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@ -174,23 +177,36 @@ static int ghash_final(struct shash_desc *desc, u8 *dst)
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return 0;
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}
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static void ghash_reflect(u64 h[], const be128 *k)
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{
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u64 carry = be64_to_cpu(k->a) & BIT(63) ? 1 : 0;
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h[0] = (be64_to_cpu(k->b) << 1) | carry;
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h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63);
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if (carry)
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h[1] ^= 0xc200000000000000UL;
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}
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static int __ghash_setkey(struct ghash_key *key,
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const u8 *inkey, unsigned int keylen)
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{
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u64 a, b;
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be128 h;
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/* needed for the fallback */
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memcpy(&key->k, inkey, GHASH_BLOCK_SIZE);
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/* perform multiplication by 'x' in GF(2^128) */
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b = get_unaligned_be64(inkey);
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a = get_unaligned_be64(inkey + 8);
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ghash_reflect(key->h, &key->k);
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key->a = (a << 1) | (b >> 63);
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key->b = (b << 1) | (a >> 63);
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h = key->k;
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gf128mul_lle(&h, &key->k);
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ghash_reflect(key->h2, &h);
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if (b >> 63)
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key->b ^= 0xc200000000000000UL;
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gf128mul_lle(&h, &key->k);
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ghash_reflect(key->h3, &h);
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gf128mul_lle(&h, &key->k);
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ghash_reflect(key->h4, &h);
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return 0;
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}
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@ -240,8 +256,7 @@ static int gcm_setkey(struct crypto_aead *tfm, const u8 *inkey,
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unsigned int keylen)
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{
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struct gcm_aes_ctx *ctx = crypto_aead_ctx(tfm);
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be128 h1, h2;
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u8 *key = (u8 *)&h1;
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u8 key[GHASH_BLOCK_SIZE];
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int ret;
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ret = crypto_aes_expand_key(&ctx->aes_key, inkey, keylen);
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@ -253,19 +268,7 @@ static int gcm_setkey(struct crypto_aead *tfm, const u8 *inkey,
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__aes_arm64_encrypt(ctx->aes_key.key_enc, key, (u8[AES_BLOCK_SIZE]){},
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num_rounds(&ctx->aes_key));
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__ghash_setkey(&ctx->ghash_key, key, sizeof(be128));
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/* calculate H^2 (used for 2-way aggregation) */
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h2 = h1;
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gf128mul_lle(&h2, &h1);
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ctx->h2[0] = (be64_to_cpu(h2.b) << 1) | (be64_to_cpu(h2.a) >> 63);
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ctx->h2[1] = (be64_to_cpu(h2.a) << 1) | (be64_to_cpu(h2.b) >> 63);
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if (be64_to_cpu(h2.a) >> 63)
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ctx->h2[1] ^= 0xc200000000000000UL;
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return 0;
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return __ghash_setkey(&ctx->ghash_key, key, sizeof(be128));
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}
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static int gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
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@ -401,8 +404,8 @@ static int gcm_encrypt(struct aead_request *req)
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kernel_neon_begin();
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pmull_gcm_encrypt(blocks, dg, walk.dst.virt.addr,
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walk.src.virt.addr, ctx->h2, iv,
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rk, nrounds, ks);
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walk.src.virt.addr, &ctx->ghash_key,
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iv, rk, nrounds, ks);
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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@ -512,8 +515,8 @@ static int gcm_decrypt(struct aead_request *req)
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kernel_neon_begin();
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pmull_gcm_decrypt(blocks, dg, walk.dst.virt.addr,
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walk.src.virt.addr, ctx->h2, iv,
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rk, nrounds);
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walk.src.virt.addr, &ctx->ghash_key,
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iv, rk, nrounds);
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/* check if this is the final iteration of the loop */
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if (rem < (2 * AES_BLOCK_SIZE)) {
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