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Fix bug where memcpy could overrun buffer

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This commit is contained in:
Nick ODell 2013-08-02 13:21:02 -06:00
parent eba7fdb9ba
commit 8d1f7753f6
1 changed files with 4 additions and 4 deletions
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8
core/net_crypto.c
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@ -69,8 +69,8 @@ int encrypt_data(uint8_t *public_key, uint8_t *secret_key, uint8_t *nonce,
if (length - crypto_box_BOXZEROBYTES + crypto_box_ZEROBYTES > MAX_DATA_SIZE || length == 0)
return -1;
uint8_t temp_plain[MAX_DATA_SIZE + crypto_box_ZEROBYTES - crypto_box_BOXZEROBYTES] = {0};
uint8_t temp_encrypted[MAX_DATA_SIZE + crypto_box_ZEROBYTES];
uint8_t temp_plain[MAX_DATA_SIZE + crypto_box_BOXZEROBYTES] = {0};
uint8_t temp_encrypted[MAX_DATA_SIZE + crypto_box_BOXZEROBYTES];
memcpy(temp_plain + crypto_box_ZEROBYTES, plain, length); /* pad the message with 32 0 bytes. */
@ -101,8 +101,8 @@ int decrypt_data(uint8_t *public_key, uint8_t *secret_key, uint8_t *nonce,
if (length > MAX_DATA_SIZE || length <= crypto_box_BOXZEROBYTES)
return -1;
uint8_t temp_plain[MAX_DATA_SIZE - crypto_box_ZEROBYTES + crypto_box_BOXZEROBYTES];
uint8_t temp_encrypted[MAX_DATA_SIZE + crypto_box_ZEROBYTES] = {0};
uint8_t temp_plain[MAX_DATA_SIZE + crypto_box_BOXZEROBYTES];
uint8_t temp_encrypted[MAX_DATA_SIZE + crypto_box_BOXZEROBYTES] = {0};
memcpy(temp_encrypted + crypto_box_BOXZEROBYTES, encrypted, length); /* pad the message with 16 0 bytes. */