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check on tag length for AES-CCM #2930

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merged 4 commits into from
Apr 30, 2020
Merged

check on tag length for AES-CCM #2930

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231c488
check on tag length for AES-CCM
JacobBarthelmeh Apr 20, 2020
c85a53c
add macro guard for fips and selftest builds
JacobBarthelmeh Apr 27, 2020
b73e52f
move AES-CCM tag check into a local function
JacobBarthelmeh Apr 28, 2020
505fbed
fix AES-CCM tag size check on decryption
JacobBarthelmeh Apr 29, 2020
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24 changes: 24 additions & 0 deletions wolfcrypt/src/aes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6996,6 +6996,14 @@ int wc_AesCcmEncrypt(Aes* aes, byte* out, const byte* in, word32 inSz,
|| authTag == NULL || nonceSz < 7 || nonceSz > 13)
return BAD_FUNC_ARG;

/* sanity check on tag size */
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if (authTagSz != 4 && authTagSz != 6 && authTagSz != 8 &&
authTagSz != 10 && authTagSz != 12 && authTagSz != 14 &&
authTagSz != 16) {
WOLFSSL_MSG("Bad auth tag size AES-CCM");
return BAD_FUNC_ARG;
}

key = (byte*)aes->key;

status = wc_AesGetKeySize(aes, &keySize);
Expand Down Expand Up @@ -7184,6 +7192,14 @@ int wc_AesCcmEncrypt(Aes* aes, byte* out, const byte* in, word32 inSz,
authTagSz > AES_BLOCK_SIZE)
return BAD_FUNC_ARG;

/* sanity check on tag size */
if (authTagSz != 4 && authTagSz != 6 && authTagSz != 8 &&
authTagSz != 10 && authTagSz != 12 && authTagSz != 14 &&
authTagSz != 16) {
WOLFSSL_MSG("Bad auth tag size AES-CCM");
return BAD_FUNC_ARG;
}

XMEMSET(A, 0, sizeof(A));
XMEMCPY(B+1, nonce, nonceSz);
lenSz = AES_BLOCK_SIZE - 1 - (byte)nonceSz;
Expand Down Expand Up @@ -7280,6 +7296,14 @@ int wc_AesCcmDecrypt(Aes* aes, byte* out, const byte* in, word32 inSz,
authTagSz > AES_BLOCK_SIZE)
return BAD_FUNC_ARG;

/* sanity check on tag size */
if (authTagSz != 4 && authTagSz != 6 && authTagSz != 8 &&
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authTagSz != 10 && authTagSz != 12 && authTagSz != 14 &&
authTagSz != 16) {
WOLFSSL_MSG("Bad auth tag size AES-CCM");
return BAD_FUNC_ARG;
}

o = out;
oSz = inSz;
XMEMCPY(B+1, nonce, nonceSz);
Expand Down
14 changes: 14 additions & 0 deletions wolfcrypt/test/test.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9157,6 +9157,20 @@ int aesccm_test(void)
return -6313;
#endif

#if !defined(HAVE_FIPS) && !defined(HAVE_SELFTEST)
/* test fail on invalid IV sizes */
result = wc_AesCcmSetKey(&enc, k, sizeof(k));
if (result != 0)
return -6314;

/* AES-CCM encrypt and decrypt both use AES encrypt internally */
result = wc_AesCcmEncrypt(&enc, c2, p, sizeof(c2), iv, sizeof(iv),
t2, 1, a, sizeof(a));
if (result == 0) {
return -6315;
}
#endif

return 0;
}
#endif /* HAVE_AESCCM WOLFSSL_AES_128 */
Expand Down