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fixup some comments

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This commit is contained in:
Stephen Lombardo 2012-11-16 15:20:44 -05:00
parent e8c819bcf8
commit c875686617
1 changed files with 15 additions and 2 deletions
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17
src/crypto_impl.c
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@ -96,6 +96,12 @@ struct codec_ctx {
cipher_ctx *write_ctx;
};
/* activate and initialize sqlcipher. Most importantly, this will automatically
intialize OpenSSL's EVP system if it hasn't already be externally. Note that
this function may be called multiple times as new codecs are intiialized.
Thus it performs some basic counting to ensure that only the last and final
sqlcipher_deactivate() will free the EVP structures.
*/
void sqlcipher_activate() {
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
@ -115,6 +121,9 @@ void sqlcipher_activate() {
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
/* deactivate SQLCipher, most imporantly decremeting the activation count and
freeing the EVP structures on the final deactivation to ensure that
OpenSSL memory is cleaned up */
void sqlcipher_deactivate() {
sqlite3_mutex_enter(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
/* If it is initialized externally, then the init counter should never be greater than zero.
@ -132,6 +141,10 @@ void sqlcipher_deactivate() {
sqlite3_mutex_leave(sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER));
}
/* constant time memset using volitile to avoid having the memset
optimized out by the compiler.
Note: As suggested by Joachim Schipper (joachim.schipper@fox-it.com)
*/
void* sqlcipher_memset(void *v, unsigned char value, int len) {
int i = 0;
volatile unsigned char *a = v;
@ -179,7 +192,7 @@ int sqlcipher_random (void *buffer, int length) {
/**
* Free and wipe memory. Uses SQLites internal sqlite3_free so that memory
* can be countend and memory leak detection works in the tet suite.
* can be countend and memory leak detection works in the test suite.
* If ptr is not null memory will be freed.
* If sz is greater than zero, the memory will be overwritten with zero before it is freed
* If sz is > 0, and not compiled with OMIT_MEMLOCK, system will attempt to unlock the
@ -223,7 +236,7 @@ void* sqlcipher_malloc(int sz) {
/**
* Initialize a a new cipher_ctx struct. This function will allocate memory
* Initialize new cipher_ctx struct. This function will allocate memory
* for the cipher context and for the key
*
* returns SQLITE_OK if initialization was successful