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Hash_DRBG refactoring

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1. Renamed everything that had DBRG with the correct DRBG
2. Changed word64 reseed_ctr to word32 reseedCtr
3. Changed reseed interval to 0xFFFFFFFF
This commit is contained in:
John Safranek 2014-05-02 15:35:10 -07:00
parent fbe09780ca
commit fd707ebafb
2 changed files with 54 additions and 49 deletions
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95
ctaocrypt/src/random.c
View File

@ -70,12 +70,12 @@
#define OUTPUT_BLOCK_LEN (256/8)
#define MAX_REQUEST_LEN (0x1000)
#define MAX_STRING_LEN (0x100000000)
#define RESEED_MAX (0x100000000000LL)
#define RESEED_INTERVAL (0xFFFFFFFF)
#define ENTROPY_SZ 256
#define DBRG_SUCCESS 0
#define DBRG_ERROR 1
#define DBRG_NEED_RESEED 2
#define DRBG_SUCCESS 0
#define DRBG_ERROR 1
#define DRBG_NEED_RESEED 2
enum {
@ -87,8 +87,10 @@ enum {
};
static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type, byte* inA, word32 inASz,
byte* inB, word32 inBSz, byte* inC, word32 inCSz)
static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type,
byte* inA, word32 inASz,
byte* inB, word32 inBSz,
byte* inC, word32 inCSz)
{
byte ctr;
int i;
@ -104,33 +106,33 @@ static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type, byte* inA, word
for (i = 0, ctr = 1; i < len; i++, ctr++)
{
if (InitSha256(&rng->sha) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Update(&rng->sha, &ctr, sizeof(ctr)) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Update(&rng->sha, (byte*)&bits, sizeof(bits)) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
/* churning V is the only string that doesn't have
* the type added */
if (type != dbrgInitV)
if (Sha256Update(&rng->sha, &type, sizeof(type)) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Update(&rng->sha, inA, inASz) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (inB != NULL && inBSz > 0)
if (Sha256Update(&rng->sha, inB, inBSz) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (inC != NULL && inCSz > 0)
if (Sha256Update(&rng->sha, inC, inCSz) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Final(&rng->sha, rng->digest) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (outSz > SHA256_DIGEST_SIZE) {
XMEMCPY(out, rng->digest, SHA256_DIGEST_SIZE);
@ -142,14 +144,14 @@ static int Hash_df(RNG* rng, byte* out, word32 outSz, byte type, byte* inA, word
}
}
return DBRG_SUCCESS;
return DRBG_SUCCESS;
}
static int Hash_DBRG_Reseed(RNG* rng, byte* entropy, word32 entropySz)
static int Hash_DRBG_Reseed(RNG* rng, byte* entropy, word32 entropySz)
{
int ret;
byte seed[DBRG_SEED_LEN];
byte seed[DRBG_SEED_LEN];
ret = Hash_df(rng, seed, sizeof(seed), dbrgInitV, rng->V, sizeof(rng->V),
entropy, entropySz, NULL, 0);
@ -164,7 +166,7 @@ static int Hash_DBRG_Reseed(RNG* rng, byte* entropy, word32 entropySz)
if (ret != 0)
return ret;
rng->reseed_ctr = 1;
rng->reseedCtr = 1;
return 0;
}
@ -181,7 +183,7 @@ static INLINE void array_add_one(byte* data, word32 dataSz)
static int Hash_gen(RNG* rng, byte* out, word32 outSz, byte* V)
{
byte data[DBRG_SEED_LEN];
byte data[DRBG_SEED_LEN];
int i, ret;
int len = (outSz / SHA256_DIGEST_SIZE)
+ ((outSz % SHA256_DIGEST_SIZE) ? 1 : 0);
@ -204,7 +206,7 @@ static int Hash_gen(RNG* rng, byte* out, word32 outSz, byte* V)
XMEMCPY(out, rng->digest, SHA256_DIGEST_SIZE);
outSz -= SHA256_DIGEST_SIZE;
out += SHA256_DIGEST_SIZE;
array_add_one(data, DBRG_SEED_LEN);
array_add_one(data, DRBG_SEED_LEN);
}
else {
XMEMCPY(out, rng->digest, outSz);
@ -235,39 +237,42 @@ static INLINE void array_add(byte* d, word32 dLen, byte* s, word32 sLen)
}
static int Hash_DBRG_Generate(RNG* rng, byte* out, word32 outSz)
static int Hash_DRBG_Generate(RNG* rng, byte* out, word32 outSz)
{
int ret;
if (rng->reseed_ctr != RESEED_MAX) {
if (rng->reseedCtr != RESEED_INTERVAL) {
byte type = dbrgGenerateH;
word32 reseedCtr = rng->reseedCtr;
rng->reseedCtr++;
if (Hash_gen(rng, out, outSz, rng->V) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (InitSha256(&rng->sha) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Update(&rng->sha, &type, sizeof(type)) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Update(&rng->sha, rng->V, sizeof(rng->V)) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
if (Sha256Final(&rng->sha, rng->digest) != 0)
return DBRG_ERROR;
return DRBG_ERROR;
array_add(rng->V, sizeof(rng->V), rng->digest, sizeof(rng->digest));
array_add(rng->V, sizeof(rng->V), rng->C, sizeof(rng->C));
array_add(rng->V, sizeof(rng->V),
(byte*)&rng->reseed_ctr, sizeof(rng->reseed_ctr));
rng->reseed_ctr++;
ret = DBRG_SUCCESS;
#ifdef LITTLE_ENDIAN_ORDER
reseedCtr = ByteReverseWord32(reseedCtr);
#endif
array_add(rng->V, sizeof(rng->V), (byte*)&reseedCtr, sizeof(reseedCtr));
ret = DRBG_SUCCESS;
}
else {
ret = DBRG_NEED_RESEED;
ret = DRBG_NEED_RESEED;
}
return ret;
}
static int Hash_DBRG_Instantiate(RNG* rng, byte* seed, word32 seedSz)
static int Hash_DRBG_Instantiate(RNG* rng, byte* seed, word32 seedSz)
{
int ret;
@ -282,19 +287,19 @@ static int Hash_DBRG_Instantiate(RNG* rng, byte* seed, word32 seedSz)
if (ret != 0)
return ret;
rng->reseed_ctr = 1;
rng->reseedCtr = 1;
return 0;
}
static int Hash_DBRG_Uninstantiate(RNG* rng)
static int Hash_DRBG_Uninstantiate(RNG* rng)
{
int result = DBRG_ERROR;
int result = DRBG_ERROR;
if (rng != NULL) {
XMEMSET(rng, 0, sizeof(*rng));
result = DBRG_SUCCESS;
result = DRBG_SUCCESS;
}
return result;
@ -312,7 +317,7 @@ int InitRng(RNG* rng)
#else
byte entropy[ENTROPY_SZ];
#endif
int ret = DBRG_ERROR;
int ret = DRBG_ERROR;
#ifdef CYASSL_SMALL_STACK
entropy = (byte*)XMALLOC(ENTROPY_SZ, NULL, DYNAMIC_TYPE_TMP_BUFFER);
@ -321,7 +326,7 @@ int InitRng(RNG* rng)
#endif
if (GenerateSeed(&rng->seed, entropy, ENTROPY_SZ) == 0)
ret = Hash_DBRG_Instantiate(rng, entropy, ENTROPY_SZ);
ret = Hash_DRBG_Instantiate(rng, entropy, ENTROPY_SZ);
XMEMSET(entropy, 0, ENTROPY_SZ);
@ -339,9 +344,9 @@ int RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
int ret;
XMEMSET(output, 0, sz);
ret = Hash_DBRG_Generate(rng, output, sz);
ret = Hash_DRBG_Generate(rng, output, sz);
if (ret == DBRG_NEED_RESEED) {
if (ret == DRBG_NEED_RESEED) {
#ifdef CYASSL_SMALL_STACK
byte* entropy;
#else
@ -356,13 +361,13 @@ int RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
ret = GenerateSeed(&rng->seed, entropy, ENTROPY_SZ);
if (ret == 0) {
ret = Hash_DBRG_Reseed(rng, entropy, ENTROPY_SZ);
ret = Hash_DRBG_Reseed(rng, entropy, ENTROPY_SZ);
if (ret == 0)
ret = Hash_DBRG_Generate(rng, output, sz);
ret = Hash_DRBG_Generate(rng, output, sz);
}
else
ret = DBRG_ERROR;
ret = DRBG_ERROR;
XMEMSET(entropy, 0, ENTROPY_SZ);
@ -383,7 +388,7 @@ int RNG_GenerateByte(RNG* rng, byte* b)
void FreeRng(RNG* rng)
{
Hash_DBRG_Uninstantiate(rng);
Hash_DRBG_Uninstantiate(rng);
}
#else /* NO_RC4 */

8
cyassl/ctaocrypt/random.h
View File

@ -87,7 +87,7 @@ typedef struct RNG {
#else /* NO_RC4 */
#define DBRG_SEED_LEN (440/8)
#define DRBG_SEED_LEN (440/8)
/* secure Random Nnumber Generator */
@ -96,9 +96,9 @@ typedef struct RNG {
Sha256 sha;
byte digest[SHA256_DIGEST_SIZE];
byte V[DBRG_SEED_LEN];
byte C[DBRG_SEED_LEN];
word64 reseed_ctr;
byte V[DRBG_SEED_LEN];
byte C[DRBG_SEED_LEN];
word32 reseedCtr;
} RNG;
#endif