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Add SP800-38E limitation #7558

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Add SP800-38E limitation #7558

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17 changes: 10 additions & 7 deletions wolfcrypt/src/aes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12785,13 +12785,16 @@ int wc_AesXtsEncrypt(XtsAes* xaes, byte* out, const byte* in, word32 sz,

aes = &xaes->aes;

/* FIPS TODO: SP800-38E - Restrict data unit to 2^20 blocks per key. A block is
* AES_BLOCK_SIZE or 16-bytes (128-bits). So each key may only be used to
* protect up to 1,048,576 blocks of AES_BLOCK_SIZE (16,777,216 bytes or
* 134,217,728-bits) Add helpful printout and message along with BAD_FUNC_ARG
* return whenever sz / AES_BLOCK_SIZE > 1,048,576 or equal to that and sz is
* not a sequence of complete blocks.
*/
#if FIPS_VERSION3_GE(6,0,0)
/* SP800-38E - Restrict data unit to 2^20 blocks per key. A block is
* AES_BLOCK_SIZE or 16-bytes (128-bits). So each key may only be used to
* protect up to 1,048,576 blocks of AES_BLOCK_SIZE (16,777,216 bytes)
*/
if (sz > FIPS_XTS_LIMIT) {
WOLFSSL_MSG("Request exceeds allowed bytes per SP800-38E");
return BAD_FUNC_ARG;
}
#endif

if (aes->keylen == 0) {
WOLFSSL_MSG("wc_AesXtsEncrypt called with unset encryption key.");
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6 changes: 6 additions & 0 deletions wolfssl/wolfcrypt/aes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,12 @@ typedef struct Gcm {
#if FIPS_VERSION3_GE(6,0,0)
extern const unsigned int wolfCrypt_FIPS_aes_ro_sanity[2];
WOLFSSL_LOCAL int wolfCrypt_FIPS_AES_sanity(void);

/* SP800-38E - Restrict data unit to 2^20 blocks per key. A block is
* AES_BLOCK_SIZE or 16-bytes (128-bits). So each key may only be used to
* protect up to 1,048,576 blocks of AES_BLOCK_SIZE (16,777,216 bytes)
*/
#define FIPS_XTS_LIMIT 16777216
#endif

WOLFSSL_LOCAL void GenerateM0(Gcm* gcm);
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