Implement ssh_cipher_t for symmetric ciphers in SSH

* remove FQTermSSHCipher and FQTermSSH3DES, use ssh_cipher_t instead
* implement EVP ciphers and 3DES-SSH1

1 files changed, 82 insertions, 0 deletions

diff --git a/src/protocol/internal/ssh_3des-ssh1.c b/src/protocol/internal/ssh_3des-ssh1.c
new file mode 100644
index 0000000..9f78298
--- /dev/null
+++ b/src/protocol/internal/ssh_3des-ssh1.c
@@ -0,0 +1,82 @@
+#include "ssh_cipher.h"
+#include <openssl/des.h>
+#include <string.h>
+
+struct ssh1_3des_priv
+{
+	DES_cblock d_IV1;
+	DES_cblock d_IV2;
+	DES_cblock d_IV3;
+	DES_key_schedule d_key1;
+	DES_key_schedule d_key2;
+	DES_key_schedule d_key3;
+};
+
+static int
+init_3des(SSH_CIPHER* my)
+{
+	struct ssh1_3des_priv *priv = (struct ssh1_3des_priv*)my->priv;
+	const_DES_cblock *key = (const_DES_cblock*)my->key;
+	DES_set_key(key, &priv->d_key1);
+	DES_set_key(key+1, &priv->d_key2);
+	DES_set_key(key+2, &priv->d_key3);
+	memset(priv->d_IV1, 0, sizeof(DES_cblock));
+	memset(priv->d_IV2, 0, sizeof(DES_cblock));
+	memset(priv->d_IV3, 0, sizeof(DES_cblock));
+
+	return 1;
+}
+
+static void
+cleanup(SSH_CIPHER* my)
+{
+	if (my->key!=NULL)
+		free(my->key);
+
+	if (my->priv!=NULL)
+		free(my->priv);
+
+	free(my);
+}
+
+static int
+decrypt(SSH_CIPHER* my, const u_char *source, u_char *dest, size_t len)
+{
+	struct ssh1_3des_priv *priv = (struct ssh1_3des_priv*)my->priv;
+	DES_ncbc_encrypt(source, dest, len, &priv->d_key3, &priv->d_IV3, 0);
+	DES_ncbc_encrypt(dest, dest, len, &priv->d_key2, &priv->d_IV2, 1);
+	DES_ncbc_encrypt(dest, dest, len, &priv->d_key1, &priv->d_IV1, 0);
+	return 1;
+}
+
+static int
+encrypt(SSH_CIPHER* my, const u_char *source, u_char *dest, size_t len)
+{
+	struct ssh1_3des_priv *priv = (struct ssh1_3des_priv*)my->priv;
+	DES_ncbc_encrypt(source, dest, len, &priv->d_key1, &priv->d_IV1, 1);
+	DES_ncbc_encrypt(dest, dest, len, &priv->d_key2, &priv->d_IV2, 0);
+	DES_ncbc_encrypt(dest, dest, len, &priv->d_key3, &priv->d_IV3, 1);
+	return 1;
+}
+
+
+SSH_CIPHER*
+new_3des_ssh1(int enc)
+{
+	SSH_CIPHER *cipher = (SSH_CIPHER*)malloc(sizeof(SSH_CIPHER));
+	cipher->priv = malloc(sizeof(struct ssh1_3des_priv));
+	cipher->blkSize = 8;
+	cipher->IVSize = 0;
+	cipher->keySize = 24;
+	cipher->IV = NULL;
+	cipher->key = (unsigned char*)malloc(24);
+	if (enc)
+		cipher->crypt = encrypt;
+	else
+		cipher->crypt = decrypt;
+
+	cipher->init = init_3des;
+	cipher->cleanup = cleanup;
+
+	return cipher;
+}