[PATCH v2 5/6] crypto: x86/chacha20 - refactor to allow varying number of rounds

Eric Biggers
2018-11-30T10:10:35Z

From: Eric Biggers <ebiggers@google.com>

In preparation for adding XChaCha12 support, rename/refactor the x86_64
SIMD implementations of ChaCha20 to support different numbers of rounds.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
arch/x86/crypto/Makefile | 8 +-
...a20-avx2-x86_64.S => chacha-avx2-x86_64.S} | 33 ++--
...12vl-x86_64.S => chacha-avx512vl-x86_64.S} | 35 ++--
...0-ssse3-x86_64.S => chacha-ssse3-x86_64.S} | 41 ++---
.../crypto/{chacha20_glue.c => chacha_glue.c} | 150 +++++++++---------
5 files changed, 136 insertions(+), 131 deletions(-)
rename arch/x86/crypto/{chacha20-avx2-x86_64.S => chacha-avx2-x86_64.S} (97%)
rename arch/x86/crypto/{chacha20-avx512vl-x86_64.S => chacha-avx512vl-x86_64.S} (97%)
rename arch/x86/crypto/{chacha20-ssse3-x86_64.S => chacha-ssse3-x86_64.S} (96%)
rename arch/x86/crypto/{chacha20_glue.c => chacha_glue.c} (51%)

diff --git a/arch/x86/crypto/Makefile b/arch/x86/crypto/Makefile
index 0b31b16f49d8..45734e1cf967 100644
--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -24,7 +24,7 @@ obj-$(CONFIG_CRYPTO_CAMELLIA_X86_64) += camellia-x86_64.o
obj-$(CONFIG_CRYPTO_BLOWFISH_X86_64) += blowfish-x86_64.o
obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o
obj-$(CONFIG_CRYPTO_TWOFISH_X86_64_3WAY) += twofish-x86_64-3way.o
-obj-$(CONFIG_CRYPTO_CHACHA20_X86_64) += chacha20-x86_64.o
+obj-$(CONFIG_CRYPTO_CHACHA20_X86_64) += chacha-x86_64.o
obj-$(CONFIG_CRYPTO_SERPENT_SSE2_X86_64) += serpent-sse2-x86_64.o
obj-$(CONFIG_CRYPTO_AES_NI_INTEL) += aesni-intel.o
obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o
@@ -78,7 +78,7 @@ camellia-x86_64-y := camellia-x86_64-asm_64.o camellia_glue.o
blowfish-x86_64-y := blowfish-x86_64-asm_64.o blowfish_glue.o
twofish-x86_64-y := twofish-x86_64-asm_64.o twofish_glue.o
twofish-x86_64-3way-y := twofish-x86_64-asm_64-3way.o twofish_glue_3way.o
-chacha20-x86_64-y := chacha20-ssse3-x86_64.o chacha20_glue.o
+chacha-x86_64-y := chacha-ssse3-x86_64.o chacha_glue.o
serpent-sse2-x86_64-y := serpent-sse2-x86_64-asm_64.o serpent_sse2_glue.o

aegis128-aesni-y := aegis128-aesni-asm.o aegis128-aesni-glue.o
@@ -103,7 +103,7 @@ endif

ifeq ($(avx2_supported),yes)
camellia-aesni-avx2-y := camellia-aesni-avx2-asm_64.o camellia_aesni_avx2_glue.o
- chacha20-x86_64-y += chacha20-avx2-x86_64.o
+ chacha-x86_64-y += chacha-avx2-x86_64.o
serpent-avx2-y := serpent-avx2-asm_64.o serpent_avx2_glue.o

morus1280-avx2-y := morus1280-avx2-asm.o morus1280-avx2-glue.o
@@ -112,7 +112,7 @@ ifeq ($(avx2_supported),yes)
endif

ifeq ($(avx512_supported),yes)
- chacha20-x86_64-y += chacha20-avx512vl-x86_64.o
+ chacha-x86_64-y += chacha-avx512vl-x86_64.o
endif

aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o
diff --git a/arch/x86/crypto/chacha20-avx2-x86_64.S b/arch/x86/crypto/chacha-avx2-x86_64.S
similarity index 97%
rename from arch/x86/crypto/chacha20-avx2-x86_64.S
rename to arch/x86/crypto/chacha-avx2-x86_64.S
index b6ab082be657..32903fd450af 100644
--- a/arch/x86/crypto/chacha20-avx2-x86_64.S
+++ b/arch/x86/crypto/chacha-avx2-x86_64.S
@@ -1,5 +1,5 @@
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX2 functions
+ * ChaCha 256-bit cipher algorithm, x64 AVX2 functions
*
* Copyright (C) 2015 Martin Willi
*
@@ -38,13 +38,14 @@ CTR4BL: .octa 0x00000000000000000000000000000002

.text

-ENTRY(chacha20_2block_xor_avx2)
+ENTRY(chacha_2block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 2 data blocks output, o
# %rdx: up to 2 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts two ChaCha20 blocks by loading the state
+ # This function encrypts two ChaCha blocks by loading the state
# matrix twice across four AVX registers. It performs matrix operations
# on four words in each matrix in parallel, but requires shuffling to
# rearrange the words after each round.
@@ -68,7 +69,6 @@ ENTRY(chacha20_2block_xor_avx2)
vmovdqa ROT16(%rip),%ymm5

mov %rcx,%rax
- mov $10,%ecx

.Ldoubleround:

@@ -138,7 +138,7 @@ ENTRY(chacha20_2block_xor_avx2)
# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
vpshufd $0x39,%ymm3,%ymm3

- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround

# o0 = i0 ^ (x0 + s0)
@@ -228,15 +228,16 @@ ENTRY(chacha20_2block_xor_avx2)
lea -8(%r10),%rsp
jmp .Ldone2

-ENDPROC(chacha20_2block_xor_avx2)
+ENDPROC(chacha_2block_xor_avx2)

-ENTRY(chacha20_4block_xor_avx2)
+ENTRY(chacha_4block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 4 data blocks output, o
# %rdx: up to 4 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts four ChaCha20 block by loading the state
+ # This function encrypts four ChaCha blocks by loading the state
# matrix four times across eight AVX registers. It performs matrix
# operations on four words in two matrices in parallel, sequentially
# to the operations on the four words of the other two matrices. The
@@ -269,7 +270,6 @@ ENTRY(chacha20_4block_xor_avx2)
vmovdqa ROT16(%rip),%ymm9

mov %rcx,%rax
- mov $10,%ecx

.Ldoubleround4:

@@ -389,7 +389,7 @@ ENTRY(chacha20_4block_xor_avx2)
vpshufd $0x39,%ymm3,%ymm3
vpshufd $0x39,%ymm7,%ymm7

- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround4

# o0 = i0 ^ (x0 + s0), first block
@@ -533,15 +533,16 @@ ENTRY(chacha20_4block_xor_avx2)
lea -8(%r10),%rsp
jmp .Ldone4

-ENDPROC(chacha20_4block_xor_avx2)
+ENDPROC(chacha_4block_xor_avx2)

-ENTRY(chacha20_8block_xor_avx2)
+ENTRY(chacha_8block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: up to 8 data blocks output, o
# %rdx: up to 8 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts eight consecutive ChaCha20 blocks by loading
+ # This function encrypts eight consecutive ChaCha blocks by loading
# the state matrix in AVX registers eight times. As we need some
# scratch registers, we save the first four registers on the stack. The
# algorithm performs each operation on the corresponding word of each
@@ -588,8 +589,6 @@ ENTRY(chacha20_8block_xor_avx2)
# x12 += counter values 0-3
vpaddd %ymm1,%ymm12,%ymm12

- mov $10,%ecx
-
.Ldoubleround8:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
vpaddd 0x00(%rsp),%ymm4,%ymm0
@@ -775,7 +774,7 @@ ENTRY(chacha20_8block_xor_avx2)
vpsrld $25,%ymm4,%ymm4
vpor %ymm0,%ymm4,%ymm4

- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround8

# x0..15[0-3] += s[0..15]
@@ -1023,4 +1022,4 @@ ENTRY(chacha20_8block_xor_avx2)

jmp .Ldone8

-ENDPROC(chacha20_8block_xor_avx2)
+ENDPROC(chacha_8block_xor_avx2)
diff --git a/arch/x86/crypto/chacha20-avx512vl-x86_64.S b/arch/x86/crypto/chacha-avx512vl-x86_64.S
similarity index 97%
rename from arch/x86/crypto/chacha20-avx512vl-x86_64.S
rename to arch/x86/crypto/chacha-avx512vl-x86_64.S
index 55d34de29e3e..848f9c75fd4f 100644
--- a/arch/x86/crypto/chacha20-avx512vl-x86_64.S
+++ b/arch/x86/crypto/chacha-avx512vl-x86_64.S
@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX-512VL functions
+ * ChaCha 256-bit cipher algorithm, x64 AVX-512VL functions
*
* Copyright (C) 2018 Martin Willi
*/
@@ -24,13 +24,14 @@ CTR8BL: .octa 0x00000003000000020000000100000000

.text

-ENTRY(chacha20_2block_xor_avx512vl)
+ENTRY(chacha_2block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 2 data blocks output, o
# %rdx: up to 2 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts two ChaCha20 blocks by loading the state
+ # This function encrypts two ChaCha blocks by loading the state
# matrix twice across four AVX registers. It performs matrix operations
# on four words in each matrix in parallel, but requires shuffling to
# rearrange the words after each round.
@@ -50,8 +51,6 @@ ENTRY(chacha20_2block_xor_avx512vl)
vmovdqa %ymm2,%ymm10
vmovdqa %ymm3,%ymm11

- mov $10,%rax
-
.Ldoubleround:

# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
@@ -108,7 +107,7 @@ ENTRY(chacha20_2block_xor_avx512vl)
# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
vpshufd $0x39,%ymm3,%ymm3

- dec %rax
+ sub $2,%r8d
jnz .Ldoubleround

# o0 = i0 ^ (x0 + s0)
@@ -188,15 +187,16 @@ ENTRY(chacha20_2block_xor_avx512vl)

jmp .Ldone2

-ENDPROC(chacha20_2block_xor_avx512vl)
+ENDPROC(chacha_2block_xor_avx512vl)

-ENTRY(chacha20_4block_xor_avx512vl)
+ENTRY(chacha_4block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 4 data blocks output, o
# %rdx: up to 4 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts four ChaCha20 block by loading the state
+ # This function encrypts four ChaCha blocks by loading the state
# matrix four times across eight AVX registers. It performs matrix
# operations on four words in two matrices in parallel, sequentially
# to the operations on the four words of the other two matrices. The
@@ -225,8 +225,6 @@ ENTRY(chacha20_4block_xor_avx512vl)
vmovdqa %ymm3,%ymm14
vmovdqa %ymm7,%ymm15

- mov $10,%rax
-
.Ldoubleround4:

# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
@@ -321,7 +319,7 @@ ENTRY(chacha20_4block_xor_avx512vl)
vpshufd $0x39,%ymm3,%ymm3
vpshufd $0x39,%ymm7,%ymm7

- dec %rax
+ sub $2,%r8d
jnz .Ldoubleround4

# o0 = i0 ^ (x0 + s0), first block
@@ -455,15 +453,16 @@ ENTRY(chacha20_4block_xor_avx512vl)

jmp .Ldone4

-ENDPROC(chacha20_4block_xor_avx512vl)
+ENDPROC(chacha_4block_xor_avx512vl)

-ENTRY(chacha20_8block_xor_avx512vl)
+ENTRY(chacha_8block_xor_avx512vl)
# %rdi: Input state matrix, s
# %rsi: up to 8 data blocks output, o
# %rdx: up to 8 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts eight consecutive ChaCha20 blocks by loading
+ # This function encrypts eight consecutive ChaCha blocks by loading
# the state matrix in AVX registers eight times. Compared to AVX2, this
# mostly benefits from the new rotate instructions in VL and the
# additional registers.
@@ -508,8 +507,6 @@ ENTRY(chacha20_8block_xor_avx512vl)
vmovdqa64 %ymm14,%ymm30
vmovdqa64 %ymm15,%ymm31

- mov $10,%eax
-
.Ldoubleround8:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
vpaddd %ymm0,%ymm4,%ymm0
@@ -647,7 +644,7 @@ ENTRY(chacha20_8block_xor_avx512vl)
vpxord %ymm9,%ymm4,%ymm4
vprold $7,%ymm4,%ymm4

- dec %eax
+ sub $2,%r8d
jnz .Ldoubleround8

# x0..15[0-3] += s[0..15]
@@ -836,4 +833,4 @@ ENTRY(chacha20_8block_xor_avx512vl)

jmp .Ldone8

-ENDPROC(chacha20_8block_xor_avx512vl)
+ENDPROC(chacha_8block_xor_avx512vl)
diff --git a/arch/x86/crypto/chacha20-ssse3-x86_64.S b/arch/x86/crypto/chacha-ssse3-x86_64.S
similarity index 96%
rename from arch/x86/crypto/chacha20-ssse3-x86_64.S
rename to arch/x86/crypto/chacha-ssse3-x86_64.S
index 45e4ccdd9c98..613f80ae9857 100644
--- a/arch/x86/crypto/chacha20-ssse3-x86_64.S
+++ b/arch/x86/crypto/chacha-ssse3-x86_64.S
@@ -1,5 +1,5 @@
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 functions
+ * ChaCha 256-bit cipher algorithm, x64 SSSE3 functions
*
* Copyright (C) 2015 Martin Willi
*
@@ -24,7 +24,7 @@ CTRINC: .octa 0x00000003000000020000000100000000
.text

/*
- * chacha20_permute - permute one block
+ * chacha_permute - permute one block
*
* Permute one 64-byte block where the state matrix is in %xmm0-%xmm3. This
* function performs matrix operations on four words in parallel, but requires
@@ -32,13 +32,14 @@ CTRINC: .octa 0x00000003000000020000000100000000
* done with the slightly better performing SSSE3 byte shuffling, 7/12-bit word
* rotation uses traditional shift+OR.
*
- * Clobbers: %ecx, %xmm4-%xmm7
+ * The round count is given in %r8d.
+ *
+ * Clobbers: %r8d, %xmm4-%xmm7
*/
-chacha20_permute:
+chacha_permute:

movdqa ROT8(%rip),%xmm4
movdqa ROT16(%rip),%xmm5
- mov $10,%ecx

.Ldoubleround:
# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
@@ -107,17 +108,18 @@ chacha20_permute:
# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
pshufd $0x39,%xmm3,%xmm3

- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround

ret
-ENDPROC(chacha20_permute)
+ENDPROC(chacha_permute)

-ENTRY(chacha20_block_xor_ssse3)
+ENTRY(chacha_block_xor_ssse3)
# %rdi: Input state matrix, s
# %rsi: up to 1 data block output, o
# %rdx: up to 1 data block input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

# x0..3 = s0..3
movdqa 0x00(%rdi),%xmm0
@@ -130,7 +132,7 @@ ENTRY(chacha20_block_xor_ssse3)
movdqa %xmm3,%xmm11

mov %rcx,%rax
- call chacha20_permute
+ call chacha_permute

# o0 = i0 ^ (x0 + s0)
paddd %xmm8,%xmm0
@@ -196,32 +198,35 @@ ENTRY(chacha20_block_xor_ssse3)
lea -8(%r10),%rsp
jmp .Ldone

-ENDPROC(chacha20_block_xor_ssse3)
+ENDPROC(chacha_block_xor_ssse3)

-ENTRY(hchacha20_block_ssse3)
+ENTRY(hchacha_block_ssse3)
# %rdi: Input state matrix, s
# %rsi: output (8 32-bit words)
+ # %edx: nrounds

movdqa 0x00(%rdi),%xmm0
movdqa 0x10(%rdi),%xmm1
movdqa 0x20(%rdi),%xmm2
movdqa 0x30(%rdi),%xmm3

- call chacha20_permute
+ mov %edx,%r8d
+ call chacha_permute

movdqu %xmm0,0x00(%rsi)
movdqu %xmm3,0x10(%rsi)

ret
-ENDPROC(hchacha20_block_ssse3)
+ENDPROC(hchacha_block_ssse3)

-ENTRY(chacha20_4block_xor_ssse3)
+ENTRY(chacha_4block_xor_ssse3)
# %rdi: Input state matrix, s
# %rsi: up to 4 data blocks output, o
# %rdx: up to 4 data blocks input, i
# %rcx: input/output length in bytes
+ # %r8d: nrounds

- # This function encrypts four consecutive ChaCha20 blocks by loading the
+ # This function encrypts four consecutive ChaCha blocks by loading the
# the state matrix in SSE registers four times. As we need some scratch
# registers, we save the first four registers on the stack. The
# algorithm performs each operation on the corresponding word of each
@@ -274,8 +279,6 @@ ENTRY(chacha20_4block_xor_ssse3)
# x12 += counter values 0-3
paddd %xmm1,%xmm12

- mov $10,%ecx
-
.Ldoubleround4:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
movdqa 0x00(%rsp),%xmm0
@@ -493,7 +496,7 @@ ENTRY(chacha20_4block_xor_ssse3)
psrld $25,%xmm4
por %xmm0,%xmm4

- dec %ecx
+ sub $2,%r8d
jnz .Ldoubleround4

# x0[0-3] += s0[0]
@@ -784,4 +787,4 @@ ENTRY(chacha20_4block_xor_ssse3)

jmp .Ldone4

-ENDPROC(chacha20_4block_xor_ssse3)
+ENDPROC(chacha_4block_xor_ssse3)
diff --git a/arch/x86/crypto/chacha20_glue.c b/arch/x86/crypto/chacha_glue.c
similarity index 51%
rename from arch/x86/crypto/chacha20_glue.c
rename to arch/x86/crypto/chacha_glue.c
index 2bea425acb76..83cfb450b816 100644
--- a/arch/x86/crypto/chacha20_glue.c
+++ b/arch/x86/crypto/chacha_glue.c
@@ -1,5 +1,6 @@
/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
+ * x64 SIMD accelerated ChaCha and XChaCha stream ciphers,
+ * including ChaCha20 (RFC7539)
*
* Copyright (C) 2015 Martin Willi
*
@@ -17,120 +18,124 @@
#include <asm/fpu/api.h>
#include <asm/simd.h>

-#define CHACHA20_STATE_ALIGN 16
+#define CHACHA_STATE_ALIGN 16

-asmlinkage void chacha20_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void hchacha20_block_ssse3(const u32 *state, u32 *out);
+asmlinkage void chacha_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void hchacha_block_ssse3(const u32 *state, u32 *out, int nrounds);
#ifdef CONFIG_AS_AVX2
-asmlinkage void chacha20_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-static bool chacha20_use_avx2;
+asmlinkage void chacha_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+static bool chacha_use_avx2;
#ifdef CONFIG_AS_AVX512
-asmlinkage void chacha20_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-asmlinkage void chacha20_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
- unsigned int len);
-static bool chacha20_use_avx512vl;
+asmlinkage void chacha_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+asmlinkage void chacha_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src,
+ unsigned int len, int nrounds);
+static bool chacha_use_avx512vl;
#endif
#endif

-static unsigned int chacha20_advance(unsigned int len, unsigned int maxblocks)
+static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks)
{
len = min(len, maxblocks * CHACHA_BLOCK_SIZE);
return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE;
}

-static void chacha20_dosimd(u32 *state, u8 *dst, const u8 *src,
- unsigned int bytes)
+static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src,
+ unsigned int bytes, int nrounds)
{
#ifdef CONFIG_AS_AVX2
#ifdef CONFIG_AS_AVX512
- if (chacha20_use_avx512vl) {
+ if (chacha_use_avx512vl) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
- chacha20_8block_xor_avx512vl(state, dst, src, bytes);
+ chacha_8block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
- chacha20_8block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 8);
+ chacha_8block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
- chacha20_4block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
- chacha20_2block_xor_avx512vl(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 2);
+ chacha_2block_xor_avx512vl(state, dst, src, bytes,
+ nrounds);
+ state[12] += chacha_advance(bytes, 2);
return;
}
}
#endif
- if (chacha20_use_avx2) {
+ if (chacha_use_avx2) {
while (bytes >= CHACHA_BLOCK_SIZE * 8) {
- chacha20_8block_xor_avx2(state, dst, src, bytes);
+ chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 8;
src += CHACHA_BLOCK_SIZE * 8;
dst += CHACHA_BLOCK_SIZE * 8;
state[12] += 8;
}
if (bytes > CHACHA_BLOCK_SIZE * 4) {
- chacha20_8block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 8);
+ chacha_8block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 8);
return;
}
if (bytes > CHACHA_BLOCK_SIZE * 2) {
- chacha20_4block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes > CHACHA_BLOCK_SIZE) {
- chacha20_2block_xor_avx2(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 2);
+ chacha_2block_xor_avx2(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 2);
return;
}
}
#endif
while (bytes >= CHACHA_BLOCK_SIZE * 4) {
- chacha20_4block_xor_ssse3(state, dst, src, bytes);
+ chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
bytes -= CHACHA_BLOCK_SIZE * 4;
src += CHACHA_BLOCK_SIZE * 4;
dst += CHACHA_BLOCK_SIZE * 4;
state[12] += 4;
}
if (bytes > CHACHA_BLOCK_SIZE) {
- chacha20_4block_xor_ssse3(state, dst, src, bytes);
- state[12] += chacha20_advance(bytes, 4);
+ chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds);
+ state[12] += chacha_advance(bytes, 4);
return;
}
if (bytes) {
- chacha20_block_xor_ssse3(state, dst, src, bytes);
+ chacha_block_xor_ssse3(state, dst, src, bytes, nrounds);
state[12]++;
}
}

-static int chacha20_simd_stream_xor(struct skcipher_request *req,
- struct chacha_ctx *ctx, u8 *iv)
+static int chacha_simd_stream_xor(struct skcipher_request *req,
+ struct chacha_ctx *ctx, u8 *iv)
{
u32 *state, state_buf[16 + 2] __aligned(8);
struct skcipher_walk walk;
int err;

- BUILD_BUG_ON(CHACHA20_STATE_ALIGN != 16);
- state = PTR_ALIGN(state_buf + 0, CHACHA20_STATE_ALIGN);
+ BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
+ state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);

err = skcipher_walk_virt(&walk, req, false);

@@ -143,8 +148,8 @@ static int chacha20_simd_stream_xor(struct skcipher_request *req,
nbytes = round_down(nbytes, walk.stride);

kernel_fpu_begin();
- chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes);
+ chacha_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
+ nbytes, ctx->nrounds);
kernel_fpu_end();

err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
@@ -153,7 +158,7 @@ static int chacha20_simd_stream_xor(struct skcipher_request *req,
return err;
}

-static int chacha20_simd(struct skcipher_request *req)
+static int chacha_simd(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
@@ -161,10 +166,10 @@ static int chacha20_simd(struct skcipher_request *req)
if (req->cryptlen <= CHACHA_BLOCK_SIZE || !irq_fpu_usable())
return crypto_chacha_crypt(req);

- return chacha20_simd_stream_xor(req, ctx, req->iv);
+ return chacha_simd_stream_xor(req, ctx, req->iv);
}

-static int xchacha20_simd(struct skcipher_request *req)
+static int xchacha_simd(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
@@ -175,17 +180,18 @@ static int xchacha20_simd(struct skcipher_request *req)
if (req->cryptlen <= CHACHA_BLOCK_SIZE || !irq_fpu_usable())
return crypto_xchacha_crypt(req);

- BUILD_BUG_ON(CHACHA20_STATE_ALIGN != 16);
- state = PTR_ALIGN(state_buf + 0, CHACHA20_STATE_ALIGN);
+ BUILD_BUG_ON(CHACHA_STATE_ALIGN != 16);
+ state = PTR_ALIGN(state_buf + 0, CHACHA_STATE_ALIGN);
crypto_chacha_init(state, ctx, req->iv);

kernel_fpu_begin();
- hchacha20_block_ssse3(state, subctx.key);
+ hchacha_block_ssse3(state, subctx.key, ctx->nrounds);
kernel_fpu_end();
+ subctx.nrounds = ctx->nrounds;

memcpy(&real_iv[0], req->iv + 24, 8);
memcpy(&real_iv[8], req->iv + 16, 8);
- return chacha20_simd_stream_xor(req, &subctx, real_iv);
+ return chacha_simd_stream_xor(req, &subctx, real_iv);
}

static struct skcipher_alg algs[] = {
@@ -202,8 +208,8 @@ static struct skcipher_alg algs[] = {
.ivsize = CHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = chacha20_simd,
- .decrypt = chacha20_simd,
+ .encrypt = chacha_simd,
+ .decrypt = chacha_simd,
}, {
.base.cra_name = "xchacha20",
.base.cra_driver_name = "xchacha20-simd",
@@ -217,40 +223,40 @@ static struct skcipher_alg algs[] = {
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = xchacha20_simd,
- .decrypt = xchacha20_simd,
+ .encrypt = xchacha_simd,
+ .decrypt = xchacha_simd,
},
};

-static int __init chacha20_simd_mod_init(void)
+static int __init chacha_simd_mod_init(void)
{
if (!boot_cpu_has(X86_FEATURE_SSSE3))
return -ENODEV;

#ifdef CONFIG_AS_AVX2
- chacha20_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
- boot_cpu_has(X86_FEATURE_AVX2) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
+ chacha_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
+ boot_cpu_has(X86_FEATURE_AVX2) &&
+ cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
#ifdef CONFIG_AS_AVX512
- chacha20_use_avx512vl = chacha20_use_avx2 &&
- boot_cpu_has(X86_FEATURE_AVX512VL) &&
- boot_cpu_has(X86_FEATURE_AVX512BW); /* kmovq */
+ chacha_use_avx512vl = chacha_use_avx2 &&
+ boot_cpu_has(X86_FEATURE_AVX512VL) &&
+ boot_cpu_has(X86_FEATURE_AVX512BW); /* kmovq */
#endif
#endif
return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
}

-static void __exit chacha20_simd_mod_fini(void)
+static void __exit chacha_simd_mod_fini(void)
{
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
}

-module_init(chacha20_simd_mod_init);
-module_exit(chacha20_simd_mod_fini);
+module_init(chacha_simd_mod_init);
+module_exit(chacha_simd_mod_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
-MODULE_DESCRIPTION("chacha20 cipher algorithm, SIMD accelerated");
+MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (x64 SIMD accelerated)");
MODULE_ALIAS_CRYPTO("chacha20");
MODULE_ALIAS_CRYPTO("chacha20-simd");
MODULE_ALIAS_CRYPTO("xchacha20");
--
2.20.0.rc0.387.gc7a69e6b6c-goog