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Diffstat (limited to 'nacl/crypto_stream/salsa2012/ref/stream.c')
-rw-r--r--nacl/crypto_stream/salsa2012/ref/stream.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/nacl/crypto_stream/salsa2012/ref/stream.c b/nacl/crypto_stream/salsa2012/ref/stream.c
new file mode 100644
index 00000000..86053337
--- /dev/null
+++ b/nacl/crypto_stream/salsa2012/ref/stream.c
@@ -0,0 +1,49 @@
1/*
2version 20080913
3D. J. Bernstein
4Public domain.
5*/
6
7#include "crypto_core_salsa2012.h"
8#include "crypto_stream.h"
9
10typedef unsigned int uint32;
11
12static const unsigned char sigma[16] = "expand 32-byte k";
13
14int crypto_stream(
15 unsigned char *c,unsigned long long clen,
16 const unsigned char *n,
17 const unsigned char *k
18)
19{
20 unsigned char in[16];
21 unsigned char block[64];
22 int i;
23 unsigned int u;
24
25 if (!clen) return 0;
26
27 for (i = 0;i < 8;++i) in[i] = n[i];
28 for (i = 8;i < 16;++i) in[i] = 0;
29
30 while (clen >= 64) {
31 crypto_core_salsa2012(c,in,k,sigma);
32
33 u = 1;
34 for (i = 8;i < 16;++i) {
35 u += (unsigned int) in[i];
36 in[i] = u;
37 u >>= 8;
38 }
39
40 clen -= 64;
41 c += 64;
42 }
43
44 if (clen) {
45 crypto_core_salsa2012(block,in,k,sigma);
46 for (i = 0;i < clen;++i) c[i] = block[i];
47 }
48 return 0;
49}