66 lines
1.7 KiB
ArmAsm
66 lines
1.7 KiB
ArmAsm
# Copyright (c) (2019,2020) Apple Inc. All rights reserved.
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#
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# corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which
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# is contained in the License.txt file distributed with corecrypto) and only to
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# people who accept that license. IMPORTANT: Any license rights granted to you by
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# Apple Inc. (if any) are limited to internal use within your organization only on
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# devices and computers you own or control, for the sole purpose of verifying the
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# security characteristics and correct functioning of the Apple Software. You may
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# not, directly or indirectly, redistribute the Apple Software or any portions thereof.
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#if defined(__arm64__)
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#include "arm64_isa_compatibility.h"
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#include "ccarm_pac_bti_macros.h"
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// per block
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#define in x0
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#define out x1
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#define key x2
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#define keylen x3
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#define t x5
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.subsections_via_symbols
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.text
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.p2align 4
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.globl _AccelerateCrypto_AES_decrypt
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_AccelerateCrypto_AES_decrypt:
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BRANCH_TARGET_CALL
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#if BUILDKERNEL
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// save used vector registers
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sub sp, sp, #3*16
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st1.4s {v0,v1,v2}, [sp]
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#endif
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ldr w3, [key, #240] // keylength = 32-bit
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ldr q0, [in] // plain data
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mov t, keylen
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ldr q1, [key, t] // expanded key
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sub t, t, #16
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ldr q2, [key] // expanded key
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0:
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AESD 0, 1
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AESIMC 0, 0
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ldr q1, [key, t] // expanded key
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subs t, t, #16
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b.gt 0b
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AESD 0, 1
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eor.16b v0, v0, v2
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str q0, [out]
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#if BUILDKERNEL
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// restore used vector registers
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ld1.4s {v0,v1,v2}, [sp], #48
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#endif
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mov x0, #0
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ret lr
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#undef in
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#undef out
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#undef key
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#undef keylen
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#endif
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