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Diff of /branches/ssh_chacha20poly1305/ttssh2/ttxssh/ttxssh.c
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#include "ttcommon.h" |
#include "ttcommon.h" |
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#include "ttlib.h" |
#include "ttlib.h" |
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#include "keyfiles.h" |
#include "keyfiles.h" |
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#include "arc4random.h" |
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#include <stdlib.h> |
#include <stdlib.h> |
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#include <stdio.h> |
#include <stdio.h> |
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// |
// |
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// RC4 |
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// |
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/* Size of key to use */ |
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#define SEED_SIZE 20 |
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/* Number of bytes to reseed after */ |
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#define REKEY_BYTES (1 << 24) |
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static int rc4_ready = 0; |
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static RC4_KEY rc4; |
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static void seed_rng(void) |
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{ |
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if (RAND_status() != 1) |
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return; |
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} |
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static void arc4random_stir(void) |
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{ |
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unsigned char rand_buf[SEED_SIZE]; |
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int i; |
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memset(&rc4, 0, sizeof(rc4)); |
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if (RAND_bytes(rand_buf, sizeof(rand_buf)) <= 0) { |
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//fatal("Couldn't obtain random bytes (error %ld)", |
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// ERR_get_error()); |
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} |
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RC4_set_key(&rc4, sizeof(rand_buf), rand_buf); |
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/* |
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* Discard early keystream, as per recommendations in: |
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* http://www.wisdom.weizmann.ac.il/~itsik/RC4/Papers/Rc4_ksa.ps |
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*/ |
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for(i = 0; i <= 256; i += sizeof(rand_buf)) |
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RC4(&rc4, sizeof(rand_buf), rand_buf, rand_buf); |
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SecureZeroMemory(rand_buf, sizeof(rand_buf)); |
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rc4_ready = REKEY_BYTES; |
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} |
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static unsigned int arc4random(void) |
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{ |
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unsigned int r = 0; |
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static int first_time = 1; |
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if (rc4_ready <= 0) { |
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if (first_time) { |
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seed_rng(); |
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} |
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first_time = 0; |
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arc4random_stir(); |
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} |
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RC4(&rc4, sizeof(r), (unsigned char *)&r, (unsigned char *)&r); |
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rc4_ready -= sizeof(r); |
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return(r); |
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} |
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void arc4random_buf(void *_buf, size_t n) |
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{ |
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size_t i; |
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unsigned int r = 0; |
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char *buf = (char *)_buf; |
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for (i = 0; i < n; i++) { |
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if (i % 4 == 0) |
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r = arc4random(); |
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buf[i] = r & 0xff; |
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r >>= 8; |
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} |
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i = r = 0; |
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} |
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// |
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// SSH1 3DES |
// SSH1 3DES |
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// |
// |
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/* |
/* |
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Legend:
| Removed from v.6229 |
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| changed lines |
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Added in v.6250 |
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