crypto: mips/chacha - wire up accelerated 32r2 code from Zinc
This integrates the accelerated MIPS 32r2 implementation of ChaCha into both the API and library interfaces of the kernel crypto stack. The significance of this is that, in addition to becoming available as an accelerated library implementation, it can also be used by existing crypto API code such as Adiantum (for block encryption on ultra low performance cores) or IPsec using chacha20poly1305. These are use cases that have already opted into using the abstract crypto API. In order to support Adiantum, the core assembler routine has been adapted to take the round count as a function argument rather than hardcoding it to 20. Co-developed-by: René van Dorst <opensource@vdorst.com> Signed-off-by: René van Dorst <opensource@vdorst.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
Родитель
49aa7c00ed
Коммит
3a2f58f3ba
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@ -323,7 +323,7 @@ libs-$(CONFIG_MIPS_FP_SUPPORT) += arch/mips/math-emu/
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# See arch/mips/Kbuild for content of core part of the kernel
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core-y += arch/mips/
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drivers-$(CONFIG_MIPS_CRC_SUPPORT) += arch/mips/crypto/
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drivers-y += arch/mips/crypto/
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drivers-$(CONFIG_OPROFILE) += arch/mips/oprofile/
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# suspend and hibernation support
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@ -4,3 +4,7 @@
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#
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obj-$(CONFIG_CRYPTO_CRC32_MIPS) += crc32-mips.o
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obj-$(CONFIG_CRYPTO_CHACHA_MIPS) += chacha-mips.o
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chacha-mips-y := chacha-core.o chacha-glue.o
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AFLAGS_chacha-core.o += -O2 # needed to fill branch delay slots
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@ -125,7 +125,7 @@
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#define CONCAT3(a,b,c) _CONCAT3(a,b,c)
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#define STORE_UNALIGNED(x) \
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CONCAT3(.Lchacha20_mips_xor_unaligned_, PLUS_ONE(x), _b: ;) \
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CONCAT3(.Lchacha_mips_xor_unaligned_, PLUS_ONE(x), _b: ;) \
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.if (x != 12); \
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lw T0, (x*4)(STATE); \
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.endif; \
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@ -142,7 +142,7 @@ CONCAT3(.Lchacha20_mips_xor_unaligned_, PLUS_ONE(x), _b: ;) \
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swr X ## x, (x*4)+LSB ## (OUT);
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#define STORE_ALIGNED(x) \
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CONCAT3(.Lchacha20_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
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CONCAT3(.Lchacha_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
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.if (x != 12); \
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lw T0, (x*4)(STATE); \
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.endif; \
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@ -162,9 +162,9 @@ CONCAT3(.Lchacha20_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
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* Every jumptable entry must be equal in size.
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*/
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#define JMPTBL_ALIGNED(x) \
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.Lchacha20_mips_jmptbl_aligned_ ## x: ; \
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.Lchacha_mips_jmptbl_aligned_ ## x: ; \
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.set noreorder; \
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b .Lchacha20_mips_xor_aligned_ ## x ## _b; \
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b .Lchacha_mips_xor_aligned_ ## x ## _b; \
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.if (x == 12); \
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addu SAVED_X, X ## x, NONCE_0; \
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.else; \
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@ -173,9 +173,9 @@ CONCAT3(.Lchacha20_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
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.set reorder
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#define JMPTBL_UNALIGNED(x) \
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.Lchacha20_mips_jmptbl_unaligned_ ## x: ; \
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.Lchacha_mips_jmptbl_unaligned_ ## x: ; \
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.set noreorder; \
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b .Lchacha20_mips_xor_unaligned_ ## x ## _b; \
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b .Lchacha_mips_xor_unaligned_ ## x ## _b; \
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.if (x == 12); \
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addu SAVED_X, X ## x, NONCE_0; \
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.else; \
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@ -200,15 +200,18 @@ CONCAT3(.Lchacha20_mips_xor_aligned_, PLUS_ONE(x), _b: ;) \
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.text
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.set reorder
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.set noat
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.globl chacha20_mips
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.ent chacha20_mips
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chacha20_mips:
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.globl chacha_crypt_arch
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.ent chacha_crypt_arch
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chacha_crypt_arch:
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.frame $sp, STACK_SIZE, $ra
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/* Load number of rounds */
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lw $at, 16($sp)
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addiu $sp, -STACK_SIZE
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/* Return bytes = 0. */
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beqz BYTES, .Lchacha20_mips_end
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beqz BYTES, .Lchacha_mips_end
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lw NONCE_0, 48(STATE)
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@ -228,18 +231,15 @@ chacha20_mips:
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or IS_UNALIGNED, IN, OUT
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andi IS_UNALIGNED, 0x3
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/* Set number of rounds */
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li $at, 20
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b .Lchacha20_rounds_start
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b .Lchacha_rounds_start
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.align 4
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.Loop_chacha20_rounds:
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.Loop_chacha_rounds:
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addiu IN, CHACHA20_BLOCK_SIZE
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addiu OUT, CHACHA20_BLOCK_SIZE
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addiu NONCE_0, 1
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.Lchacha20_rounds_start:
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.Lchacha_rounds_start:
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lw X0, 0(STATE)
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lw X1, 4(STATE)
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lw X2, 8(STATE)
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@ -259,7 +259,7 @@ chacha20_mips:
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lw X14, 56(STATE)
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lw X15, 60(STATE)
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.Loop_chacha20_xor_rounds:
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.Loop_chacha_xor_rounds:
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addiu $at, -2
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AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 16);
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AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 12);
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@ -269,31 +269,31 @@ chacha20_mips:
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AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 12);
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AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 8);
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AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 7);
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bnez $at, .Loop_chacha20_xor_rounds
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bnez $at, .Loop_chacha_xor_rounds
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addiu BYTES, -(CHACHA20_BLOCK_SIZE)
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/* Is data src/dst unaligned? Jump */
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bnez IS_UNALIGNED, .Loop_chacha20_unaligned
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bnez IS_UNALIGNED, .Loop_chacha_unaligned
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/* Set number rounds here to fill delayslot. */
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li $at, 20
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lw $at, (STACK_SIZE+16)($sp)
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/* BYTES < 0, it has no full block. */
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bltz BYTES, .Lchacha20_mips_no_full_block_aligned
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bltz BYTES, .Lchacha_mips_no_full_block_aligned
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FOR_EACH_WORD_REV(STORE_ALIGNED)
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/* BYTES > 0? Loop again. */
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bgtz BYTES, .Loop_chacha20_rounds
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bgtz BYTES, .Loop_chacha_rounds
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/* Place this here to fill delay slot */
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addiu NONCE_0, 1
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/* BYTES < 0? Handle last bytes */
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bltz BYTES, .Lchacha20_mips_xor_bytes
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bltz BYTES, .Lchacha_mips_xor_bytes
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.Lchacha20_mips_xor_done:
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.Lchacha_mips_xor_done:
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/* Restore used registers */
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lw $s0, 0($sp)
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lw $s1, 4($sp)
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@ -307,11 +307,11 @@ chacha20_mips:
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/* Write NONCE_0 back to right location in state */
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sw NONCE_0, 48(STATE)
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.Lchacha20_mips_end:
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.Lchacha_mips_end:
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addiu $sp, STACK_SIZE
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jr $ra
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.Lchacha20_mips_no_full_block_aligned:
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.Lchacha_mips_no_full_block_aligned:
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/* Restore the offset on BYTES */
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addiu BYTES, CHACHA20_BLOCK_SIZE
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@ -319,7 +319,7 @@ chacha20_mips:
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andi $at, BYTES, MASK_U32
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/* Load upper half of jump table addr */
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lui T0, %hi(.Lchacha20_mips_jmptbl_aligned_0)
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lui T0, %hi(.Lchacha_mips_jmptbl_aligned_0)
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/* Calculate lower half jump table offset */
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ins T0, $at, 1, 6
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@ -328,7 +328,7 @@ chacha20_mips:
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addu T1, STATE, $at
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/* Add lower half jump table addr */
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addiu T0, %lo(.Lchacha20_mips_jmptbl_aligned_0)
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addiu T0, %lo(.Lchacha_mips_jmptbl_aligned_0)
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/* Read value from STATE */
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lw SAVED_CA, 0(T1)
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@ -342,31 +342,31 @@ chacha20_mips:
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FOR_EACH_WORD(JMPTBL_ALIGNED)
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.Loop_chacha20_unaligned:
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.Loop_chacha_unaligned:
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/* Set number rounds here to fill delayslot. */
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li $at, 20
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lw $at, (STACK_SIZE+16)($sp)
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/* BYTES > 0, it has no full block. */
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bltz BYTES, .Lchacha20_mips_no_full_block_unaligned
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bltz BYTES, .Lchacha_mips_no_full_block_unaligned
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FOR_EACH_WORD_REV(STORE_UNALIGNED)
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/* BYTES > 0? Loop again. */
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bgtz BYTES, .Loop_chacha20_rounds
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bgtz BYTES, .Loop_chacha_rounds
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/* Write NONCE_0 back to right location in state */
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sw NONCE_0, 48(STATE)
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.set noreorder
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/* Fall through to byte handling */
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bgez BYTES, .Lchacha20_mips_xor_done
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.Lchacha20_mips_xor_unaligned_0_b:
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.Lchacha20_mips_xor_aligned_0_b:
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bgez BYTES, .Lchacha_mips_xor_done
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.Lchacha_mips_xor_unaligned_0_b:
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.Lchacha_mips_xor_aligned_0_b:
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/* Place this here to fill delay slot */
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addiu NONCE_0, 1
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.set reorder
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.Lchacha20_mips_xor_bytes:
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.Lchacha_mips_xor_bytes:
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addu IN, $at
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addu OUT, $at
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/* First byte */
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@ -376,22 +376,22 @@ chacha20_mips:
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ROTR(SAVED_X)
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xor T1, SAVED_X
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sb T1, 0(OUT)
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beqz $at, .Lchacha20_mips_xor_done
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beqz $at, .Lchacha_mips_xor_done
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/* Second byte */
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lbu T1, 1(IN)
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addiu $at, BYTES, 2
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ROTx SAVED_X, 8
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xor T1, SAVED_X
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sb T1, 1(OUT)
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beqz $at, .Lchacha20_mips_xor_done
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beqz $at, .Lchacha_mips_xor_done
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/* Third byte */
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lbu T1, 2(IN)
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ROTx SAVED_X, 8
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xor T1, SAVED_X
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sb T1, 2(OUT)
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b .Lchacha20_mips_xor_done
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b .Lchacha_mips_xor_done
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.Lchacha20_mips_no_full_block_unaligned:
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.Lchacha_mips_no_full_block_unaligned:
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/* Restore the offset on BYTES */
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addiu BYTES, CHACHA20_BLOCK_SIZE
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@ -399,7 +399,7 @@ chacha20_mips:
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andi $at, BYTES, MASK_U32
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/* Load upper half of jump table addr */
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lui T0, %hi(.Lchacha20_mips_jmptbl_unaligned_0)
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lui T0, %hi(.Lchacha_mips_jmptbl_unaligned_0)
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/* Calculate lower half jump table offset */
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ins T0, $at, 1, 6
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@ -408,7 +408,7 @@ chacha20_mips:
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addu T1, STATE, $at
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/* Add lower half jump table addr */
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addiu T0, %lo(.Lchacha20_mips_jmptbl_unaligned_0)
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addiu T0, %lo(.Lchacha_mips_jmptbl_unaligned_0)
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/* Read value from STATE */
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lw SAVED_CA, 0(T1)
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@ -420,5 +420,78 @@ chacha20_mips:
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/* Jump table */
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FOR_EACH_WORD(JMPTBL_UNALIGNED)
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.end chacha20_mips
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.end chacha_crypt_arch
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.set at
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/* Input arguments
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* STATE $a0
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* OUT $a1
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* NROUND $a2
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*/
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#undef X12
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#undef X13
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#undef X14
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#undef X15
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#define X12 $a3
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#define X13 $at
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#define X14 $v0
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#define X15 STATE
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.set noat
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.globl hchacha_block_arch
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.ent hchacha_block_arch
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hchacha_block_arch:
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.frame $sp, STACK_SIZE, $ra
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addiu $sp, -STACK_SIZE
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/* Save X11(s6) */
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sw X11, 0($sp)
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lw X0, 0(STATE)
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lw X1, 4(STATE)
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lw X2, 8(STATE)
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lw X3, 12(STATE)
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lw X4, 16(STATE)
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lw X5, 20(STATE)
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lw X6, 24(STATE)
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lw X7, 28(STATE)
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lw X8, 32(STATE)
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lw X9, 36(STATE)
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lw X10, 40(STATE)
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lw X11, 44(STATE)
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lw X12, 48(STATE)
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lw X13, 52(STATE)
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lw X14, 56(STATE)
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lw X15, 60(STATE)
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.Loop_hchacha_xor_rounds:
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addiu $a2, -2
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AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 16);
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AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 12);
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AXR( 0, 1, 2, 3, 4, 5, 6, 7, 12,13,14,15, 8);
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AXR( 8, 9,10,11, 12,13,14,15, 4, 5, 6, 7, 7);
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AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 16);
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AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 12);
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AXR( 0, 1, 2, 3, 5, 6, 7, 4, 15,12,13,14, 8);
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AXR(10,11, 8, 9, 15,12,13,14, 5, 6, 7, 4, 7);
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bnez $a2, .Loop_hchacha_xor_rounds
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/* Restore used register */
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lw X11, 0($sp)
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sw X0, 0(OUT)
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sw X1, 4(OUT)
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sw X2, 8(OUT)
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sw X3, 12(OUT)
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sw X12, 16(OUT)
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sw X13, 20(OUT)
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sw X14, 24(OUT)
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sw X15, 28(OUT)
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addiu $sp, STACK_SIZE
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jr $ra
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.end hchacha_block_arch
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.set at
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@ -0,0 +1,150 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* MIPS accelerated ChaCha and XChaCha stream ciphers,
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* including ChaCha20 (RFC7539)
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*
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* Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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*/
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#include <asm/byteorder.h>
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#include <crypto/algapi.h>
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#include <crypto/internal/chacha.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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asmlinkage void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src,
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unsigned int bytes, int nrounds);
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EXPORT_SYMBOL(chacha_crypt_arch);
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asmlinkage void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds);
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EXPORT_SYMBOL(hchacha_block_arch);
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void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)
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{
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chacha_init_generic(state, key, iv);
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}
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EXPORT_SYMBOL(chacha_init_arch);
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static int chacha_mips_stream_xor(struct skcipher_request *req,
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const struct chacha_ctx *ctx, const u8 *iv)
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{
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struct skcipher_walk walk;
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u32 state[16];
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int err;
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err = skcipher_walk_virt(&walk, req, false);
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chacha_init_generic(state, ctx->key, iv);
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while (walk.nbytes > 0) {
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unsigned int nbytes = walk.nbytes;
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if (nbytes < walk.total)
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nbytes = round_down(nbytes, walk.stride);
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chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr,
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nbytes, ctx->nrounds);
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err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
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}
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return err;
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}
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static int chacha_mips(struct skcipher_request *req)
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{
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
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return chacha_mips_stream_xor(req, ctx, req->iv);
|
||||
}
|
||||
|
||||
static int xchacha_mips(struct skcipher_request *req)
|
||||
{
|
||||
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
||||
struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
|
||||
struct chacha_ctx subctx;
|
||||
u32 state[16];
|
||||
u8 real_iv[16];
|
||||
|
||||
chacha_init_generic(state, ctx->key, req->iv);
|
||||
|
||||
hchacha_block(state, subctx.key, ctx->nrounds);
|
||||
subctx.nrounds = ctx->nrounds;
|
||||
|
||||
memcpy(&real_iv[0], req->iv + 24, 8);
|
||||
memcpy(&real_iv[8], req->iv + 16, 8);
|
||||
return chacha_mips_stream_xor(req, &subctx, real_iv);
|
||||
}
|
||||
|
||||
static struct skcipher_alg algs[] = {
|
||||
{
|
||||
.base.cra_name = "chacha20",
|
||||
.base.cra_driver_name = "chacha20-mips",
|
||||
.base.cra_priority = 200,
|
||||
.base.cra_blocksize = 1,
|
||||
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
||||
.base.cra_module = THIS_MODULE,
|
||||
|
||||
.min_keysize = CHACHA_KEY_SIZE,
|
||||
.max_keysize = CHACHA_KEY_SIZE,
|
||||
.ivsize = CHACHA_IV_SIZE,
|
||||
.chunksize = CHACHA_BLOCK_SIZE,
|
||||
.setkey = chacha20_setkey,
|
||||
.encrypt = chacha_mips,
|
||||
.decrypt = chacha_mips,
|
||||
}, {
|
||||
.base.cra_name = "xchacha20",
|
||||
.base.cra_driver_name = "xchacha20-mips",
|
||||
.base.cra_priority = 200,
|
||||
.base.cra_blocksize = 1,
|
||||
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
||||
.base.cra_module = THIS_MODULE,
|
||||
|
||||
.min_keysize = CHACHA_KEY_SIZE,
|
||||
.max_keysize = CHACHA_KEY_SIZE,
|
||||
.ivsize = XCHACHA_IV_SIZE,
|
||||
.chunksize = CHACHA_BLOCK_SIZE,
|
||||
.setkey = chacha20_setkey,
|
||||
.encrypt = xchacha_mips,
|
||||
.decrypt = xchacha_mips,
|
||||
}, {
|
||||
.base.cra_name = "xchacha12",
|
||||
.base.cra_driver_name = "xchacha12-mips",
|
||||
.base.cra_priority = 200,
|
||||
.base.cra_blocksize = 1,
|
||||
.base.cra_ctxsize = sizeof(struct chacha_ctx),
|
||||
.base.cra_module = THIS_MODULE,
|
||||
|
||||
.min_keysize = CHACHA_KEY_SIZE,
|
||||
.max_keysize = CHACHA_KEY_SIZE,
|
||||
.ivsize = XCHACHA_IV_SIZE,
|
||||
.chunksize = CHACHA_BLOCK_SIZE,
|
||||
.setkey = chacha12_setkey,
|
||||
.encrypt = xchacha_mips,
|
||||
.decrypt = xchacha_mips,
|
||||
}
|
||||
};
|
||||
|
||||
static int __init chacha_simd_mod_init(void)
|
||||
{
|
||||
return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
|
||||
}
|
||||
|
||||
static void __exit chacha_simd_mod_fini(void)
|
||||
{
|
||||
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
|
||||
}
|
||||
|
||||
module_init(chacha_simd_mod_init);
|
||||
module_exit(chacha_simd_mod_fini);
|
||||
|
||||
MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (MIPS accelerated)");
|
||||
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS_CRYPTO("chacha20");
|
||||
MODULE_ALIAS_CRYPTO("chacha20-mips");
|
||||
MODULE_ALIAS_CRYPTO("xchacha20");
|
||||
MODULE_ALIAS_CRYPTO("xchacha20-mips");
|
||||
MODULE_ALIAS_CRYPTO("xchacha12");
|
||||
MODULE_ALIAS_CRYPTO("xchacha12-mips");
|
||||
|
|
@ -1442,6 +1442,12 @@ config CRYPTO_CHACHA20_X86_64
|
|||
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,
|
||||
XChaCha20, and XChaCha12 stream ciphers.
|
||||
|
||||
config CRYPTO_CHACHA_MIPS
|
||||
tristate "ChaCha stream cipher algorithms (MIPS 32r2 optimized)"
|
||||
depends on CPU_MIPS32_R2
|
||||
select CRYPTO_BLKCIPHER
|
||||
select CRYPTO_ARCH_HAVE_LIB_CHACHA
|
||||
|
||||
config CRYPTO_SEED
|
||||
tristate "SEED cipher algorithm"
|
||||
select CRYPTO_ALGAPI
|
||||
|
|
|
|||
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