*/
enum { OSSH_DSA, OSSH_RSA };
+enum { OSSH_ENC_3DES, OSSH_ENC_AES };
struct openssh_key {
int type;
- int encrypted;
+ int encrypted, encryption;
char iv[32];
unsigned char *keyblob;
int keyblob_len, keyblob_size;
if (!strcmp(p, "ENCRYPTED"))
ret->encrypted = 1;
} else if (!strcmp(line, "DEK-Info")) {
- int i, j;
-
- if (strncmp(p, "DES-EDE3-CBC,", 13)) {
- errmsg = "ciphers other than DES-EDE3-CBC not supported";
+ int i, j, ivlen;
+
+ if (!strncmp(p, "DES-EDE3-CBC,", 13)) {
+ ret->encryption = OSSH_ENC_3DES;
+ ivlen = 8;
+ } else if (!strncmp(p, "AES-128-CBC,", 12)) {
+ ret->encryption = OSSH_ENC_AES;
+ ivlen = 16;
+ } else {
+ errmsg = "unsupported cipher";
goto error;
}
- p += 13;
- for (i = 0; i < 8; i++) {
- if (1 != sscanf(p, "%2x", &j))
- break;
+ p = strchr(p, ',') + 1;/* always non-NULL, by above checks */
+ for (i = 0; i < ivlen; i++) {
+ if (1 != sscanf(p, "%2x", &j)) {
+ errmsg = "expected more iv data in DEK-Info";
+ goto error;
+ }
ret->iv[i] = j;
p += 2;
}
- if (i < 8) {
- errmsg = "expected 16-digit iv in DEK-Info";
+ if (*p) {
+ errmsg = "more iv data than expected in DEK-Info";
goto error;
}
}
/*
* Now decrypt the key blob.
*/
- des3_decrypt_pubkey_ossh(keybuf, (unsigned char *)key->iv,
- key->keyblob, key->keyblob_len);
+ if (key->encryption == OSSH_ENC_3DES)
+ des3_decrypt_pubkey_ossh(keybuf, (unsigned char *)key->iv,
+ key->keyblob, key->keyblob_len);
+ else {
+ void *ctx;
+ assert(key->encryption == OSSH_ENC_AES);
+ ctx = aes_make_context();
+ aes128_key(ctx, keybuf);
+ aes_iv(ctx, (unsigned char *)key->iv);
+ aes_ssh2_decrypt_blk(ctx, key->keyblob, key->keyblob_len);
+ aes_free_context(ctx);
+ }
memset(&md5c, 0, sizeof(md5c));
memset(keybuf, 0, sizeof(keybuf));
extern const struct ssh_mac ssh_hmac_sha1_96;
extern const struct ssh_mac ssh_hmac_sha1_96_buggy;
+void *aes_make_context(void);
+void aes_free_context(void *handle);
+void aes128_key(void *handle, unsigned char *key);
+void aes192_key(void *handle, unsigned char *key);
+void aes256_key(void *handle, unsigned char *key);
+void aes_iv(void *handle, unsigned char *iv);
+void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len);
+void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len);
/*
* PuTTY version number formatted as an SSH version string.
memcpy(ctx->iv, iv, sizeof(iv));
}
-static void *aes_make_context(void)
+void *aes_make_context(void)
{
return snew(AESContext);
}
-static void aes_free_context(void *handle)
+void aes_free_context(void *handle)
{
sfree(handle);
}
-static void aes128_key(void *handle, unsigned char *key)
+void aes128_key(void *handle, unsigned char *key)
{
AESContext *ctx = (AESContext *)handle;
aes_setup(ctx, 16, key, 16);
}
-static void aes192_key(void *handle, unsigned char *key)
+void aes192_key(void *handle, unsigned char *key)
{
AESContext *ctx = (AESContext *)handle;
aes_setup(ctx, 16, key, 24);
}
-static void aes256_key(void *handle, unsigned char *key)
+void aes256_key(void *handle, unsigned char *key)
{
AESContext *ctx = (AESContext *)handle;
aes_setup(ctx, 16, key, 32);
}
-static void aes_iv(void *handle, unsigned char *iv)
+void aes_iv(void *handle, unsigned char *iv)
{
AESContext *ctx = (AESContext *)handle;
int i;
ctx->iv[i] = GET_32BIT_MSB_FIRST(iv + 4 * i);
}
-static void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len)
+void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len)
{
AESContext *ctx = (AESContext *)handle;
aes_encrypt_cbc(blk, len, ctx);
}
-static void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len)
+void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len)
{
AESContext *ctx = (AESContext *)handle;
aes_decrypt_cbc(blk, len, ctx);