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Second attempt. Can successfully decrypt the _first block_ of a packet.

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[originally from svn r570]
This commit is contained in:
Simon Tatham
2000-09-05 16:23:36 +00:00
parent 35205e5cb7
commit 36a499a7f1
5 changed files with 169 additions and 37 deletions
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54
sshdes.c
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@ -662,28 +662,55 @@ static void des_3cbc_decrypt(unsigned char *dest, const unsigned char *src,
des_cbc_decrypt(dest, src, len, &scheds[0]);
}
static DESContext keys[3];
static DESContext cskeys[3], sckeys[3];
static void des3_cskey(unsigned char *key) {
des_key_setup(GET_32BIT_MSB_FIRST(key),
GET_32BIT_MSB_FIRST(key+4), &cskeys[0]);
des_key_setup(GET_32BIT_MSB_FIRST(key+8),
GET_32BIT_MSB_FIRST(key+12), &cskeys[1]);
des_key_setup(GET_32BIT_MSB_FIRST(key+16),
GET_32BIT_MSB_FIRST(key+20), &cskeys[2]);
logevent("Initialised triple-DES client->server encryption");
}
static void des3_csiv(unsigned char *key) {
cskeys[0].eiv0 = GET_32BIT_MSB_FIRST(key);
cskeys[0].eiv1 = GET_32BIT_MSB_FIRST(key+4);
}
static void des3_sciv(unsigned char *key) {
sckeys[0].div0 = GET_32BIT_MSB_FIRST(key);
sckeys[0].div1 = GET_32BIT_MSB_FIRST(key+4);
}
static void des3_sckey(unsigned char *key) {
des_key_setup(GET_32BIT_MSB_FIRST(key),
GET_32BIT_MSB_FIRST(key+4), &sckeys[0]);
des_key_setup(GET_32BIT_MSB_FIRST(key+8),
GET_32BIT_MSB_FIRST(key+12), &sckeys[1]);
des_key_setup(GET_32BIT_MSB_FIRST(key+16),
GET_32BIT_MSB_FIRST(key+20), &sckeys[2]);
logevent("Initialised triple-DES server->client encryption");
}
static void des3_sesskey(unsigned char *key) {
des_key_setup(GET_32BIT_MSB_FIRST(key),
GET_32BIT_MSB_FIRST(key+4), &keys[0]);
des_key_setup(GET_32BIT_MSB_FIRST(key+8),
GET_32BIT_MSB_FIRST(key+12), &keys[1]);
des_key_setup(GET_32BIT_MSB_FIRST(key+16),
GET_32BIT_MSB_FIRST(key+20), &keys[2]);
logevent("Initialised triple-DES encryption");
des3_cskey(key);
des3_sckey(key);
}
static void des3_encrypt_blk(unsigned char *blk, int len) {
des_3cbc_encrypt(blk, blk, len, keys);
des_3cbc_encrypt(blk, blk, len, cskeys);
}
static void des3_decrypt_blk(unsigned char *blk, int len) {
des_3cbc_decrypt(blk, blk, len, keys);
des_3cbc_decrypt(blk, blk, len, sckeys);
}
struct ssh_cipher ssh_3des = {
des3_sesskey,
des3_csiv, des3_cskey,
des3_sciv, des3_sckey,
des3_encrypt_blk,
des3_decrypt_blk,
"3des-cbc",
@ -692,20 +719,21 @@ struct ssh_cipher ssh_3des = {
static void des_sesskey(unsigned char *key) {
des_key_setup(GET_32BIT_MSB_FIRST(key),
GET_32BIT_MSB_FIRST(key+4), &keys[0]);
GET_32BIT_MSB_FIRST(key+4), &cskeys[0]);
logevent("Initialised single-DES encryption");
}
static void des_encrypt_blk(unsigned char *blk, int len) {
des_cbc_encrypt(blk, blk, len, keys);
des_cbc_encrypt(blk, blk, len, cskeys);
}
static void des_decrypt_blk(unsigned char *blk, int len) {
des_cbc_decrypt(blk, blk, len, keys);
des_cbc_decrypt(blk, blk, len, cskeys);
}
struct ssh_cipher ssh_des = {
des_sesskey,
NULL, NULL, NULL, NULL, /* SSH 2 bits - unused */
des_encrypt_blk,
des_decrypt_blk,
"des-cbc", /* should never be used - not a valid cipher in ssh2 */