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Change call site of sqlite3_randomness and fortuna_ready 

sqlite3_randomness was blocking when invoked with
sqlcipher_ltc_activate.  As new entropy is added to the pool, calls to
fortuna_ready are required to allow the new entropy to be used.
This commit is contained in:
Nick Parker 2013-06-06 11:04:03 -05:00
parent a60090f879
commit 7026edb969
1 changed files with 17 additions and 16 deletions
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33
src/crypto_libtomcrypt.c
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@ -19,19 +19,11 @@ static int sqlcipher_ltc_activate(void *ctx) {
ltc_ctx *ltc = (ltc_ctx*)ctx;
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
if(ltc_init == 0) {
int random_buffer_sz = 256;
char random_buffer[random_buffer_sz];
if(register_prng(&fortuna_desc) != CRYPT_OK) return SQLITE_ERROR;
if(register_cipher(&rijndael_desc) != CRYPT_OK) return SQLITE_ERROR;
if(register_hash(&sha1_desc) != CRYPT_OK) return SQLITE_ERROR;
if(fortuna_start(&(ltc->prng)) != CRYPT_OK) return SQLITE_ERROR;
sqlite3_randomness(random_buffer_sz, random_buffer);
if(sqlcipher_ltc_add_random(ctx, random_buffer, random_buffer_sz) != SQLITE_OK) return SQLITE_ERROR;
if(sqlcipher_ltc_add_random(ctx, &ltc, sizeof(ltc_ctx *)) != SQLITE_OK) return SQLITE_ERROR;
if(fortuna_ready(&(ltc->prng)) != CRYPT_OK) return SQLITE_ERROR;
ltc_init = 1;
}
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
@ -48,9 +40,17 @@ static const char* sqlcipher_ltc_get_provider_name(void *ctx) {
}
static int sqlcipher_ltc_random(void *ctx, void *buffer, int length) {
int random_value;
ltc_ctx *ltc = (ltc_ctx*)ctx;
int random_buffer_sz = 256;
char random_buffer[random_buffer_sz];
sqlite3_randomness(random_buffer_sz, &random_buffer);
if(sqlcipher_ltc_add_random(ctx, random_buffer, random_buffer_sz) != SQLITE_OK) {
return SQLITE_ERROR;
}
if(fortuna_ready(&(ltc->prng)) != CRYPT_OK) {
return SQLITE_ERROR;
}
fortuna_read(buffer, length, &(ltc->prng));
return SQLITE_OK;
}
@ -65,6 +65,7 @@ static int sqlcipher_ltc_hmac(void *ctx, unsigned char *hmac_key, int key_sz, un
if((rc = hmac_process(&hmac, in, in_sz)) != CRYPT_OK) return SQLITE_ERROR;
if((rc = hmac_process(&hmac, in2, in2_sz)) != CRYPT_OK) return SQLITE_ERROR;
if((rc = hmac_done(&hmac, out, &outlen)) != CRYPT_OK) return SQLITE_ERROR;
sqlcipher_ltc_add_random(ctx, out, outlen);
return SQLITE_OK;
}
@ -76,14 +77,14 @@ static int sqlcipher_ltc_kdf(void *ctx, const unsigned char *pass, int pass_sz,
hash_idx = find_hash("sha1");
if((rc = pkcs_5_alg2(pass, pass_sz, salt, salt_sz,
workfactor, hash_idx, key, &outlen)) != CRYPT_OK) return SQLITE_ERROR;
// improve entropy of foruna
workfactor, hash_idx, key, &outlen)) != CRYPT_OK) {
return SQLITE_ERROR;
}
if((rc = pkcs_5_alg2(key, key_sz, salt, salt_sz,
1, hash_idx, random_buffer, &random_buffer_sz)) != CRYPT_OK) return SQLITE_ERROR;
1, hash_idx, random_buffer, &random_buffer_sz)) != CRYPT_OK) {
return SQLITE_ERROR;
}
sqlcipher_ltc_add_random(ctx, random_buffer, random_buffer_sz);
return SQLITE_OK;
}