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SSH2 transport layer now enables encryption and MAC successfully for 3DES

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[originally from svn r571]
This commit is contained in:
Simon Tatham
2000-09-06 09:55:32 +00:00
parent 36a499a7f1
commit 0f1e449189
3 changed files with 118 additions and 7 deletions
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75
sshdes.c
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@ -1,6 +1,10 @@
#include <assert.h>
#include <stdarg.h> /* FIXME */
#include <windows.h> /* FIXME */
#include "putty.h" /* FIXME */
#include "ssh.h"
/* des.c - implementation of DES
*/
@ -655,6 +659,30 @@ static void des_3cbc_encrypt(unsigned char *dest, const unsigned char *src,
des_cbc_encrypt(dest, src, len, &scheds[2]);
}
static void des_cbc3_encrypt(unsigned char *dest, const unsigned char *src,
unsigned int len, DESContext *scheds) {
word32 out[2], iv0, iv1;
unsigned int i;
assert((len & 7) == 0);
iv0 = scheds->eiv0;
iv1 = scheds->eiv1;
for (i = 0; i < len; i += 8) {
iv0 ^= GET_32BIT_MSB_FIRST(src); src += 4;
iv1 ^= GET_32BIT_MSB_FIRST(src); src += 4;
des_encipher(out, iv0, iv1, &scheds[0]);
des_decipher(out, out[0], out[1], &scheds[1]);
des_encipher(out, out[0], out[1], &scheds[2]);
iv0 = out[0];
iv1 = out[1];
PUT_32BIT_MSB_FIRST(dest, iv0); dest += 4;
PUT_32BIT_MSB_FIRST(dest, iv1); dest += 4;
}
scheds->eiv0 = iv0;
scheds->eiv1 = iv1;
}
static void des_3cbc_decrypt(unsigned char *dest, const unsigned char *src,
unsigned int len, DESContext *scheds) {
des_cbc_decrypt(dest, src, len, &scheds[2]);
@ -662,6 +690,32 @@ static void des_3cbc_decrypt(unsigned char *dest, const unsigned char *src,
des_cbc_decrypt(dest, src, len, &scheds[0]);
}
static void des_cbc3_decrypt(unsigned char *dest, const unsigned char *src,
unsigned int len, DESContext *scheds) {
word32 out[2], iv0, iv1, xL, xR;
unsigned int i;
assert((len & 7) == 0);
iv0 = scheds->div0;
iv1 = scheds->div1;
for (i = 0; i < len; i += 8) {
xL = GET_32BIT_MSB_FIRST(src); src += 4;
xR = GET_32BIT_MSB_FIRST(src); src += 4;
des_decipher(out, xL, xR, &scheds[2]);
des_encipher(out, out[0], out[1], &scheds[1]);
des_decipher(out, out[0], out[1], &scheds[0]);
iv0 ^= out[0];
iv1 ^= out[1];
PUT_32BIT_MSB_FIRST(dest, iv0); dest += 4;
PUT_32BIT_MSB_FIRST(dest, iv1); dest += 4;
iv0 = xL;
iv1 = xR;
}
scheds->div0 = iv0;
scheds->div1 = iv1;
}
static DESContext cskeys[3], sckeys[3];
static void des3_cskey(unsigned char *key) {
@ -707,10 +761,27 @@ static void des3_decrypt_blk(unsigned char *blk, int len) {
des_3cbc_decrypt(blk, blk, len, sckeys);
}
struct ssh_cipher ssh_3des = {
des3_sesskey,
static void des3_ssh2_encrypt_blk(unsigned char *blk, int len) {
des_cbc3_encrypt(blk, blk, len, cskeys);
}
static void des3_ssh2_decrypt_blk(unsigned char *blk, int len) {
des_cbc3_decrypt(blk, blk, len, sckeys);
}
struct ssh_cipher ssh_3des_ssh2 = {
NULL,
des3_csiv, des3_cskey,
des3_sciv, des3_sckey,
des3_ssh2_encrypt_blk,
des3_ssh2_decrypt_blk,
"3des-cbc",
8
};
struct ssh_cipher ssh_3des = {
des3_sesskey,
NULL, NULL, NULL, NULL,
des3_encrypt_blk,
des3_decrypt_blk,
"3des-cbc",