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Fix to resolve issue with PIC32MZ crypto hardware (AES/DES3 only) where an unaligned input/output buffer was not handled correctly. This results in a BUFFER_E. This was seen with DTLS v1.0 and TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA cipher suite. Fix is to allocate a dynamic buffer from heap if the input/output are not aligned. Tested and verified with a PIC32MZ2048EFM144 and the wolfssl_udp_client example for Harmony using DTLS v1.0 and the setudppacketoptions 192.168.0.107 11111 hello -> sendudppacket commands. Cleanups in older ctoacrypt/settings.h for PIC32MZ.

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This commit is contained in:
David Garske
2018-08-22 13:39:03 -07:00
parent 776fd51720
commit 53af520911
2 changed files with 42 additions and 10 deletions
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18
cyassl/ctaocrypt/settings.h
View File

@ -150,16 +150,20 @@
#define TFM_TIMING_RESISTANT
#endif
#ifdef CYASSL_MICROCHIP_PIC32MZ
#define CYASSL_PIC32MZ_CE
#define CYASSL_PIC32MZ_CRYPT
#define HAVE_AES_ENGINE
#define CYASSL_PIC32MZ_RNG
/* #define CYASSL_PIC32MZ_HASH */
#if defined(CYASSL_MICROCHIP_PIC32MZ) || defined(WOLFSSL_MICROCHIP_PIC32MZ)
#ifndef NO_PIC32MZ_CRYPT
#define WOLFSSL_PIC32MZ_CRYPT
#endif
#ifndef NO_PIC32MZ_RNG
#define WOLFSSL_PIC32MZ_RNG
#endif
#ifndef NO_PIC32MZ_HASH
#define WOLFSSL_PIC32MZ_HASH
#endif
#define CYASSL_AES_COUNTER
#define HAVE_AESGCM
#define NO_BIG_INT
#endif
#ifdef MICROCHIP_TCPIP_V5

34
wolfcrypt/src/port/pic32/pic32mz-crypt.c
View File

@ -75,7 +75,7 @@ static int Pic32GetBlockSize(int algo)
return 0;
}
static int Pic32Crypto(const byte* in, int inLen, word32* out, int outLen,
static int Pic32Crypto(const byte* pIn, int inLen, word32* pOut, int outLen,
int dir, int algo, int cryptoalgo,
/* For DES/AES only */
@ -92,6 +92,9 @@ static int Pic32Crypto(const byte* in, int inLen, word32* out, int outLen,
word32* dst;
word32 padRemain;
int timeout = 0xFFFFFF;
word32* in = (word32*)pIn;
word32* out = pOut;
int isDynamic = 0;
/* check args */
if (in == NULL || inLen <= 0 || out == NULL || blockSize == 0) {
@ -100,7 +103,21 @@ static int Pic32Crypto(const byte* in, int inLen, word32* out, int outLen,
/* check pointer alignment - must be word aligned */
if (((size_t)in % sizeof(word32)) || ((size_t)out % sizeof(word32))) {
return BUFFER_E; /* buffer is not aligned */
/* dynamically allocate aligned pointers */
isDynamic = 1;
in = (word32*)XMALLOC(inLen, NULL, DYNAMIC_TYPE_AES_BUFFER);
if (in == NULL)
return MEMORY_E;
if ((word32*)pIn == pOut) /* inline */
out = (word32*)in;
else {
out = (word32*)XMALLOC(outLen, NULL, DYNAMIC_TYPE_AES_BUFFER);
if (out == NULL) {
XFREE(in, NULL, DYNAMIC_TYPE_AES_BUFFER);
return MEMORY_E;
}
}
XMEMCPY(in, pIn, inLen);
}
/* get uncached address */
@ -173,7 +190,7 @@ static int Pic32Crypto(const byte* in, int inLen, word32* out, int outLen,
bd_p->SRCADDR = (unsigned int)KVA_TO_PA(in);
if (key) {
/* cipher */
if (in != (byte*)out)
if (in != out)
XMEMSET(out_p, 0, outLen); /* clear output buffer */
bd_p->DSTADDR = (unsigned int)KVA_TO_PA(out);
}
@ -236,6 +253,17 @@ static int Pic32Crypto(const byte* in, int inLen, word32* out, int outLen,
#endif
}
/* handle unaligned */
if (isDynamic) {
/* return result */
XMEMCPY(pOut, out, outLen);
/* free dynamic buffers */
XFREE(in, NULL, DYNAMIC_TYPE_AES_BUFFER);
if ((word32*)pIn != pOut)
XFREE(out, NULL, DYNAMIC_TYPE_AES_BUFFER);
}
return ret;
}
#endif /* WOLFSSL_PIC32MZ_CRYPT || WOLFSSL_PIC32MZ_HASH */