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Fix obsolete comments. Add new comments. Fix non-standard spacing.

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FossilOrigin-Name: a0d224c6a69941dad1f2b35edcc7ddee343b99eae2aeed74043461f3e97ef5b4
This commit is contained in:
drh
2022-08-16 16:57:33 +00:00
parent 534945ad07
commit cd05aafa56
3 changed files with 16 additions and 19 deletions
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21
src/random.c
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@@ -27,12 +27,15 @@ static SQLITE_WSD struct sqlite3PrngType {
u8 n; /* Output bytes remaining */
} sqlite3Prng;
/* The RFC-7539 ChaCha20 block function
*/
#define ROTL(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
#define QR(a, b, c, d) ( \
a += b, d ^= a, d = ROTL(d,16), \
c += d, b ^= c, b = ROTL(b,12), \
a += b, d ^= a, d = ROTL(d, 8), \
c += d, b ^= c, b = ROTL(b, 7))
#define QR(a, b, c, d) ( \
a += b, d ^= a, d = ROTL(d,16), \
c += d, b ^= c, b = ROTL(b,12), \
a += b, d ^= a, d = ROTL(d, 8), \
c += d, b ^= c, b = ROTL(b, 7))
static void chacha_block(u32 *out, const u32 *in){
int i;
u32 x[16];
@@ -89,13 +92,7 @@ void sqlite3_randomness(int N, void *pBuf){
}
/* Initialize the state of the random number generator once,
** the first time this routine is called. The seed value does
** not need to contain a lot of randomness since we are not
** trying to do secure encryption or anything like that...
**
** Nothing in this file or anywhere else in SQLite does any kind of
** encryption. The RC4 algorithm is being used as a PRNG (pseudo-random
** number generator) not as an encryption device.
** the first time this routine is called.
*/
if( wsdPrng.s[0]==0 ){
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);