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add random generation through chacha

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This commit is contained in:
Vincent Hanquez 2015-03-28 15:33:03 +00:00
parent cb2562a512
commit 06832d678d
1 changed files with 18 additions and 0 deletions
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18
cbits/cryptonite_chacha.c
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@ -29,6 +29,7 @@
*/ */
#include <stdint.h> #include <stdint.h>
#include <string.h>
#include "cryptonite_chacha.h" #include "cryptonite_chacha.h"
#include "cryptonite_bitfn.h" #include "cryptonite_bitfn.h"
#include <stdio.h> #include <stdio.h>
@ -197,3 +198,20 @@ void cryptonite_chacha_generate(uint32_t rounds, block *dst, cryptonite_chacha_s
} }
} }
void cryptonite_chacha_random(uint32_t rounds, uint8_t *dst, cryptonite_chacha_state *st, uint32_t bytes)
{
block out;
if (!bytes)
return;
for (; bytes >= 16; bytes -= 16, dst += 16) {
chacha_core(rounds, &out, st);
memcpy(dst, out.b + 40, 16);
cryptonite_chacha_init(st, out.b, 32, out.b + 32, 8);
}
if (bytes) {
chacha_core(rounds, &out, st);
memcpy(dst, out.b + 40, bytes);
cryptonite_chacha_init(st, out.b, 32, out.b + 32, 8);
}
}