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AES-GCM performance enhancement

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This commit is contained in:
Jacob Barthelmeh
2017-12-23 13:02:16 -07:00
parent 6d3166316b
commit cf1575fafb
2 changed files with 50 additions and 1 deletions
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45
wolfcrypt/src/aes.c
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@@ -3050,6 +3050,11 @@ int wc_AesSetIV(Aes* aes, const byte* iv)
#endif /* HAVE_AES_CBC */
#ifdef HAVE_AES_ECB
#ifdef WOLFSSL_IMX6_CAAM
/* implemented in wolfcrypt/src/port/caam/caam_aes.c */
#else
/* software implementation */
int wc_AesEcbEncrypt(Aes* aes, byte* out, const byte* in, word32 sz)
{
word32 blocks = sz / AES_BLOCK_SIZE;
@@ -3083,6 +3088,7 @@ int wc_AesEcbDecrypt(Aes* aes, byte* out, const byte* in, word32 sz)
return 0;
}
#endif
#endif
/* AES-CTR */
#if defined(WOLFSSL_AES_COUNTER)
@@ -6955,6 +6961,25 @@ int wc_AesGcmEncrypt(Aes* aes, byte* out, const byte* in, word32 sz,
}
/* process remainder using partial handling */
#endif
#if defined(HAVE_AES_ECB) && !defined(WOLFSSL_PIC32MZ_CRYPT)
/* some hardware acceleration can gain performance from doing AES encryption
* of the whole buffer at once */
if (c != p) { /* can not handle inline encryption */
while (blocks--) {
IncrementGcmCounter(ctr);
XMEMCPY(c, ctr, AES_BLOCK_SIZE);
c += AES_BLOCK_SIZE;
}
/* reset number of blocks and then do encryption */
blocks = sz / AES_BLOCK_SIZE;
wc_AesEcbEncrypt(aes, out, out, AES_BLOCK_SIZE * blocks);
xorbuf(out, p, AES_BLOCK_SIZE * blocks);
p += AES_BLOCK_SIZE * blocks;
}
else
#endif /* HAVE_AES_ECB */
while (blocks--) {
IncrementGcmCounter(ctr);
#ifndef WOLFSSL_PIC32MZ_CRYPT
@@ -7234,6 +7259,24 @@ int wc_AesGcmDecrypt(Aes* aes, byte* out, const byte* in, word32 sz,
/* process remainder using partial handling */
#endif
#if defined(HAVE_AES_ECB) && !defined(WOLFSSL_PIC32MZ_CRYPT)
/* some hardware acceleration can gain performance from doing AES encryption
* of the whole buffer at once */
if (c != p) { /* can not handle inline decryption */
while (blocks--) {
IncrementGcmCounter(ctr);
XMEMCPY(p, ctr, AES_BLOCK_SIZE);
p += AES_BLOCK_SIZE;
}
/* reset number of blocks and then do encryption */
blocks = sz / AES_BLOCK_SIZE;
wc_AesEcbEncrypt(aes, out, out, AES_BLOCK_SIZE * blocks);
xorbuf(out, c, AES_BLOCK_SIZE * blocks);
c += AES_BLOCK_SIZE * blocks;
}
else
#endif /* HAVE_AES_ECB */
while (blocks--) {
IncrementGcmCounter(ctr);
#ifndef WOLFSSL_PIC32MZ_CRYPT
@@ -7244,13 +7287,13 @@ int wc_AesGcmDecrypt(Aes* aes, byte* out, const byte* in, word32 sz,
p += AES_BLOCK_SIZE;
c += AES_BLOCK_SIZE;
}
if (partial != 0) {
IncrementGcmCounter(ctr);
wc_AesEncrypt(aes, ctr, scratch);
xorbuf(scratch, c, partial);
XMEMCPY(p, scratch, partial);
}
#endif
return ret;

6
wolfssl/wolfcrypt/settings.h
View File

@@ -1196,6 +1196,12 @@ extern void uITRON4_free(void *p) ;
#undef WOLFSSL_IMX6_CAAM_BLOB
#define WOLFSSL_IMX6_CAAM_BLOB
#ifdef HAVE_AESGCM
/* large performance gain with HAVE_AES_ECB defined */
#undef HAVE_AES_ECB
#define HAVE_AES_ECB
#endif
#endif
#if !defined(XMALLOC_USER) && !defined(MICRIUM_MALLOC) && \