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Verify in2 is not null before attempting to compute hmac

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This commit is contained in:
Nick Parker 2017-10-13 14:51:52 -05:00
parent 5fa49b4b0e
commit a3f0729a0d
3 changed files with 6 additions and 4 deletions
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3
src/crypto_cc.c
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@ -66,9 +66,10 @@ static const char* sqlcipher_cc_get_provider_version(void *ctx) {
static int sqlcipher_cc_hmac(void *ctx, unsigned char *hmac_key, int key_sz, unsigned char *in, int in_sz, unsigned char *in2, int in2_sz, unsigned char *out) {
CCHmacContext hmac_context;
if(in == NULL) return SQLITE_ERROR;
CCHmacInit(&hmac_context, kCCHmacAlgSHA1, hmac_key, key_sz);
CCHmacUpdate(&hmac_context, in, in_sz);
CCHmacUpdate(&hmac_context, in2, in2_sz);
if(in2 != NULL) CCHmacUpdate(&hmac_context, in2, in2_sz);
CCHmacFinal(&hmac_context, out);
return SQLITE_OK;
}

3
src/crypto_libtomcrypt.c
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@ -145,9 +145,10 @@ static int sqlcipher_ltc_hmac(void *ctx, unsigned char *hmac_key, int key_sz, un
unsigned long outlen = key_sz;
hash_idx = find_hash("sha1");
if(in == NULL) return SQLITE_ERROR;
if((rc = hmac_init(&hmac, hash_idx, hmac_key, key_sz)) != CRYPT_OK) return SQLITE_ERROR;
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(in2 != NULL && (rc = hmac_process(&hmac, in2, in2_sz)) != CRYPT_OK) return SQLITE_ERROR;
if((rc = hmac_done(&hmac, out, &outlen)) != CRYPT_OK) return SQLITE_ERROR;
return SQLITE_OK;
}

4
src/crypto_openssl.c
View File

@ -207,10 +207,10 @@ static int sqlcipher_openssl_random (void *ctx, void *buffer, int length) {
static int sqlcipher_openssl_hmac(void *ctx, unsigned char *hmac_key, int key_sz, unsigned char *in, int in_sz, unsigned char *in2, int in2_sz, unsigned char *out) {
unsigned int outlen;
HMAC_CTX* hctx = HMAC_CTX_new();
if(hctx == NULL) return SQLITE_ERROR;
if(hctx == NULL || in == NULL) return SQLITE_ERROR;
HMAC_Init_ex(hctx, hmac_key, key_sz, EVP_sha1(), NULL);
HMAC_Update(hctx, in, in_sz);
HMAC_Update(hctx, in2, in2_sz);
if(in2 != NULL) HMAC_Update(hctx, in2, in2_sz);
HMAC_Final(hctx, out, &outlen);
HMAC_CTX_free(hctx);
return SQLITE_OK;