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ARMv8 AES: remove extra memcpy during encrypt/decrypt

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This commit is contained in:
Jacob Barthelmeh
2016-09-03 03:49:20 +00:00
parent 8e4ccd355c
commit 09b29cb1d4
1 changed files with 38 additions and 45 deletions
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83
wolfcrypt/src/aes.c
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@ -347,12 +347,8 @@ void wc_AesAsyncFree(Aes* aes)
#elif defined(WOLFSSL_ARMASM)
static int wc_AesEncrypt(Aes* aes, const byte* inBlock, byte* outBlock)
{
byte* keyPt = (byte*)aes->key;
byte* keyPt = (byte*)aes->key;
word32 rounds = aes->rounds;
byte out[AES_BLOCK_SIZE];
byte* output = out;
byte* input = (byte*)inBlock;
/*
AESE exor's input with round key
@ -361,7 +357,7 @@ void wc_AesAsyncFree(Aes* aes)
*/
__asm__ __volatile__ (
"LD1 {v0.16b}, [%[CtrIn]], #16 \n"
"LD1 {v0.16b}, [%[CtrIn]] \n"
"LD1 {v1.16b-v4.16b}, [%[Key]], #64 \n"
"AESE v0.16b, v1.16b \n"
@ -386,12 +382,12 @@ void wc_AesAsyncFree(Aes* aes)
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESE v0.16b, v1.16b \n"
"AESMC v0.16b, v0.16b \n"
"AESE v0.16b, v2.16b \n"
"AESE v0.16b, v2.16b \n"
"#subtract rounds done so far and see if should continue\n"
"MOV w12, %w[R] \n"
"MOV w12, %w[R] \n"
"SUB w12, w12, #10 \n"
"CBZ w12, final \n"
"CBZ w12, final \n"
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESMC v0.16b, v0.16b \n"
"AESE v0.16b, v1.16b \n"
@ -399,7 +395,7 @@ void wc_AesAsyncFree(Aes* aes)
"AESE v0.16b, v2.16b \n"
"SUB w12, w12, #2 \n"
"CBZ w12, final \n"
"CBZ w12, final \n"
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESMC v0.16b, v0.16b \n"
"AESE v0.16b, v1.16b \n"
@ -408,27 +404,24 @@ void wc_AesAsyncFree(Aes* aes)
"#Final AddRoundKey then store result \n"
"final: \n"
"LD1 {v1.16b}, [%[Key]], #16 \n"
"EOR v0.16b, v0.16b, v1.16b \n"
"ST1 {v0.16b}, [%[CtrOut]] \n"
"LD1 {v1.16b}, [%[Key]], #16 \n"
"EOR v0.16b, v0.16b, v1.16b \n"
"ST1 {v0.16b}, [%[CtrOut]] \n"
:[CtrOut] "=r" (output), "=r" (keyPt), "=r" (rounds)
:[Key] "1" (keyPt), [R] "2" (rounds), [CtrIn] "r" (input), "0" (output)
:[CtrOut] "=r" (outBlock), "=r" (keyPt), "=r" (rounds),
"=r" (inBlock)
:"0" (outBlock), [Key] "1" (keyPt), [R] "2" (rounds),
[CtrIn] "3" (inBlock)
: "cc", "memory", "w12"
);
XMEMCPY(outBlock, out, AES_BLOCK_SIZE);
return 0;
}
#ifdef HAVE_AES_DECRYPT
static int wc_AesDecrypt(Aes* aes, const byte* inBlock, byte* outBlock)
{
byte* keyPt = (byte*)aes->key;
byte* keyPt = (byte*)aes->key;
word32 rounds = aes->rounds;
byte out[AES_BLOCK_SIZE];
byte* output = out;
byte* input = (byte*)inBlock;
/*
AESE exor's input with round key
@ -437,64 +430,64 @@ void wc_AesAsyncFree(Aes* aes)
*/
__asm__ __volatile__ (
"LD1 {v0.16b}, [%[CtrIn]], #16 \n"
"LD1 {v0.16b}, [%[CtrIn]] \n"
"LD1 {v1.16b-v4.16b}, [%[Key]], #64 \n"
"AESD v0.16b, v1.16b \n"
"AESD v0.16b, v1.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v2.16b \n"
"AESD v0.16b, v2.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v3.16b \n"
"AESD v0.16b, v3.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v4.16b \n"
"AESD v0.16b, v4.16b \n"
"AESIMC v0.16b, v0.16b \n"
"LD1 {v1.16b-v4.16b}, [%[Key]], #64 \n"
"AESD v0.16b, v1.16b \n"
"AESD v0.16b, v1.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v2.16b \n"
"AESD v0.16b, v2.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v3.16b \n"
"AESD v0.16b, v3.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v4.16b \n"
"AESD v0.16b, v4.16b \n"
"AESIMC v0.16b, v0.16b \n"
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESD v0.16b, v1.16b \n"
"AESD v0.16b, v1.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v2.16b \n"
"AESD v0.16b, v2.16b \n"
"#subtract rounds done so far and see if should continue\n"
"MOV w12, %w[R] \n"
"MOV w12, %w[R] \n"
"SUB w12, w12, #10 \n"
"CBZ w12, finalDec \n"
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v1.16b \n"
"AESD v0.16b, v1.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v2.16b \n"
"AESD v0.16b, v2.16b \n"
"SUB w12, w12, #2 \n"
"SUB w12, w12, #2 \n"
"CBZ w12, finalDec \n"
"LD1 {v1.16b-v2.16b}, [%[Key]], #32 \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v1.16b \n"
"AESD v0.16b, v1.16b \n"
"AESIMC v0.16b, v0.16b \n"
"AESD v0.16b, v2.16b \n"
"AESD v0.16b, v2.16b \n"
"#Final AddRoundKey then store result \n"
"finalDec: \n"
"LD1 {v1.16b}, [%[Key]], #16 \n"
"EOR v0.16b, v0.16b, v1.16b \n"
"ST1 {v0.4s}, [%[CtrOut]] \n"
"LD1 {v1.16b}, [%[Key]], #16 \n"
"EOR v0.16b, v0.16b, v1.16b \n"
"ST1 {v0.4s}, [%[CtrOut]] \n"
:[CtrOut] "=r" (output), "=r" (keyPt), "=r" (rounds), "=r" (input)
:[Key] "1" (keyPt), [R] "2" (rounds), [CtrIn] "3" (input), "0" (output)
:[CtrOut] "=r" (outBlock), "=r" (keyPt), "=r" (rounds),
"=r" (inBlock)
:"0" (outBlock), [Key] "1" (keyPt), [R] "2" (rounds),
[CtrIn] "3" (inBlock)
: "cc", "memory", "w12"
);
XMEMCPY(outBlock, out, AES_BLOCK_SIZE);
return 0;
}
#endif /* HAVE_AES_DECRYPT */