- markus@cvs.openbsd.org 2002/02/18 13:05:32

     [cipher.c cipher.h]
     switch to EVP, ok djm@ deraadt@

1 files changed, 313 insertions, 370 deletions

diff --git a/cipher.c b/cipher.c
index c31696ce..ce3f6f3c 100644
--- a/cipher.c
+++ b/cipher.c
@@ -35,386 +35,50 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: cipher.c,v 1.51 2002/02/14 23:41:01 markus Exp $");
+RCSID("$OpenBSD: cipher.c,v 1.52 2002/02/18 13:05:32 markus Exp $");
 
 #include "xmalloc.h"
 #include "log.h"
 #include "cipher.h"
 
 #include <openssl/md5.h>
+#include "rijndael.h"
+
+static EVP_CIPHER *evp_ssh1_3des(void);
+static EVP_CIPHER *evp_ssh1_bf(void);
+static EVP_CIPHER *evp_rijndael(void);
 
 struct Cipher {
 	char	*name;
 	int	number;		/* for ssh1 only */
 	u_int	block_size;
 	u_int	key_len;
-	void	(*setkey)(CipherContext *, const u_char *, u_int);
-	void	(*setiv)(CipherContext *, const u_char *, u_int);
-	void	(*encrypt)(CipherContext *, u_char *, const u_char *, u_int);
-	void	(*decrypt)(CipherContext *, u_char *, const u_char *, u_int);
-};
-
-/* no encryption */
-static void
-none_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-}
-static void
-none_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-}
-static void
-none_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	memcpy(dest, src, len);
-}
-
-/* DES */
-static void
-des_ssh1_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	static int dowarn = 1;
-	if (dowarn) {
-		error("Warning: use of DES is strongly discouraged "
-		    "due to cryptographic weaknesses");
-		dowarn = 0;
-	}
-	des_set_key((void *)key, cc->u.des.key);
-}
-static void
-des_ssh1_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-	memset(cc->u.des.iv, 0, sizeof(cc->u.des.iv));
-}
-static void
-des_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	des_ncbc_encrypt(src, dest, len, cc->u.des.key, &cc->u.des.iv,
-	    DES_ENCRYPT);
-}
-static void
-des_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	des_ncbc_encrypt(src, dest, len, cc->u.des.key, &cc->u.des.iv,
-	    DES_DECRYPT);
-}
-
-/* 3DES */
-static void
-des3_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	des_set_key((void *) key, cc->u.des3.key1);
-	des_set_key((void *) (key+8), cc->u.des3.key2);
-	des_set_key((void *) (key+16), cc->u.des3.key3);
-}
-static void
-des3_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-	memset(cc->u.des3.iv1, 0, sizeof(cc->u.des3.iv1));
-	memset(cc->u.des3.iv2, 0, sizeof(cc->u.des3.iv2));
-	memset(cc->u.des3.iv3, 0, sizeof(cc->u.des3.iv3));
-	if (iv == NULL)
-		return;
-	memcpy(cc->u.des3.iv3, (char *)iv, 8);
-}
-static void
-des3_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	des_ede3_cbc_encrypt(src, dest, len,
-	    cc->u.des3.key1, cc->u.des3.key2, cc->u.des3.key3,
-	    &cc->u.des3.iv3, DES_ENCRYPT);
-}
-static void
-des3_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	des_ede3_cbc_encrypt(src, dest, len,
-	    cc->u.des3.key1, cc->u.des3.key2, cc->u.des3.key3,
-	    &cc->u.des3.iv3, DES_DECRYPT);
-}
-
-/*
- * This is used by SSH1:
- *
- * What kind of triple DES are these 2 routines?
- *
- * Why is there a redundant initialization vector?
- *
- * If only iv3 was used, then, this would till effect have been
- * outer-cbc. However, there is also a private iv1 == iv2 which
- * perhaps makes differential analysis easier. On the other hand, the
- * private iv1 probably makes the CRC-32 attack ineffective. This is a
- * result of that there is no longer any known iv1 to use when
- * choosing the X block.
- */
-static void
-des3_ssh1_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	des_set_key((void *) key, cc->u.des3.key1);
-	des_set_key((void *) (key+8), cc->u.des3.key2);
-	if (keylen <= 16)
-		des_set_key((void *) key, cc->u.des3.key3);
-	else
-		des_set_key((void *) (key+16), cc->u.des3.key3);
-}
-static void
-des3_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	des_ncbc_encrypt(src,  dest, len, cc->u.des3.key1, &cc->u.des3.iv1,
-	    DES_ENCRYPT);
-	des_ncbc_encrypt(dest, dest, len, cc->u.des3.key2, &cc->u.des3.iv2,
-	    DES_DECRYPT);
-	des_ncbc_encrypt(dest, dest, len, cc->u.des3.key3, &cc->u.des3.iv3,
-	    DES_ENCRYPT);
-}
-static void
-des3_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	des_ncbc_encrypt(src,  dest, len, cc->u.des3.key3, &cc->u.des3.iv3,
-	    DES_DECRYPT);
-	des_ncbc_encrypt(dest, dest, len, cc->u.des3.key2, &cc->u.des3.iv2,
-	    DES_ENCRYPT);
-	des_ncbc_encrypt(dest, dest, len, cc->u.des3.key1, &cc->u.des3.iv1,
-	    DES_DECRYPT);
-}
-
-/* Blowfish */
-static void
-blowfish_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	BF_set_key(&cc->u.bf.key, keylen, (u_char *)key);
-}
-static void
-blowfish_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-	if (iv == NULL)
-		memset(cc->u.bf.iv, 0, 8);
-	else
-		memcpy(cc->u.bf.iv, (char *)iv, 8);
-}
-static void
-blowfish_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	BF_cbc_encrypt((void *)src, dest, len, &cc->u.bf.key, cc->u.bf.iv,
-	    BF_ENCRYPT);
-}
-static void
-blowfish_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	BF_cbc_encrypt((void *)src, dest, len, &cc->u.bf.key, cc->u.bf.iv,
-	    BF_DECRYPT);
-}
-
-/*
- * SSH1 uses a variation on Blowfish, all bytes must be swapped before
- * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
- */
-static void
-swap_bytes(const u_char *src, u_char *dst, int n)
-{
-	char c[4];
-
-	/* Process 4 bytes every lap. */
-	for (n = n / 4; n > 0; n--) {
-		c[3] = *src++;
-		c[2] = *src++;
-		c[1] = *src++;
-		c[0] = *src++;
-
-		*dst++ = c[0];
-		*dst++ = c[1];
-		*dst++ = c[2];
-		*dst++ = c[3];
-	}
-}
-
-static void
-blowfish_ssh1_encrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	swap_bytes(src, dest, len);
-	BF_cbc_encrypt((void *)dest, dest, len, &cc->u.bf.key, cc->u.bf.iv,
-	    BF_ENCRYPT);
-	swap_bytes(dest, dest, len);
-}
-static void
-blowfish_ssh1_decrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	swap_bytes(src, dest, len);
-	BF_cbc_encrypt((void *)dest, dest, len, &cc->u.bf.key, cc->u.bf.iv,
-	    BF_DECRYPT);
-	swap_bytes(dest, dest, len);
-}
-
-/* alleged rc4 */
-static void
-arcfour_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	RC4_set_key(&cc->u.rc4, keylen, (u_char *)key);
-}
-static void
-arcfour_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	RC4(&cc->u.rc4, len, (u_char *)src, dest);
-}
-
-/* CAST */
-static void
-cast_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	CAST_set_key(&cc->u.cast.key, keylen, (u_char *) key);
-}
-static void
-cast_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-	if (iv == NULL)
-		fatal("no IV for %s.", cc->cipher->name);
-	memcpy(cc->u.cast.iv, (char *)iv, 8);
-}
-static void
-cast_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	CAST_cbc_encrypt(src, dest, len, &cc->u.cast.key, cc->u.cast.iv,
-	    CAST_ENCRYPT);
-}
-static void
-cast_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
-{
-	CAST_cbc_encrypt(src, dest, len, &cc->u.cast.key, cc->u.cast.iv,
-	    CAST_DECRYPT);
-}
-
-/* RIJNDAEL */
-
-#define RIJNDAEL_BLOCKSIZE 16
-static void
-rijndael_setkey(CipherContext *cc, const u_char *key, u_int keylen)
-{
-	rijndael_set_key(&cc->u.rijndael.enc, (char *)key, 8*keylen, 1);
-	rijndael_set_key(&cc->u.rijndael.dec, (char *)key, 8*keylen, 0);
-}
-static void
-rijndael_setiv(CipherContext *cc, const u_char *iv, u_int ivlen)
-{
-	if (iv == NULL || ivlen != RIJNDAEL_BLOCKSIZE)
-		fatal("bad/no IV for %s.", cc->cipher->name);
-	memcpy(cc->u.rijndael.iv, iv, RIJNDAEL_BLOCKSIZE);
-}
-static void
-rijndael_cbc_encrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	rijndael_ctx *ctx = &cc->u.rijndael.enc;
-	u_char *iv = cc->u.rijndael.iv;
-	u_char in[RIJNDAEL_BLOCKSIZE];
-	u_char *cprev, *cnow, *plain;
-	int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
-
-	if (len == 0)
-		return;
-	if (len % RIJNDAEL_BLOCKSIZE)
-		fatal("rijndael_cbc_encrypt: bad len %d", len);
-	cnow  = dest;
-	plain = (u_char *)src;
-	cprev = iv;
-	for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE,
-	    cnow+=RIJNDAEL_BLOCKSIZE) {
-		for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
-			in[j] = plain[j] ^ cprev[j];
-		rijndael_encrypt(ctx, in, cnow);
-		cprev = cnow;
-	}
-	memcpy(iv, cprev, RIJNDAEL_BLOCKSIZE);
-}
-static void
-rijndael_cbc_decrypt(CipherContext *cc, u_char *dest, const u_char *src,
-    u_int len)
-{
-	rijndael_ctx *ctx = &cc->u.rijndael.dec;
-	u_char *iv = cc->u.rijndael.iv;
-	u_char ivsaved[RIJNDAEL_BLOCKSIZE];
-	u_char *cnow  = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE);
-	u_char *plain = dest+len-RIJNDAEL_BLOCKSIZE;
-	u_char *ivp;
-	int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
-
-	if (len == 0)
-		return;
-	if (len % RIJNDAEL_BLOCKSIZE)
-		fatal("rijndael_cbc_decrypt: bad len %d", len);
-	memcpy(ivsaved, cnow, RIJNDAEL_BLOCKSIZE);
-	for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
-	    plain-=RIJNDAEL_BLOCKSIZE) {
-		rijndael_decrypt(ctx, cnow, plain);
-		ivp = (i == 1) ? iv : cnow-RIJNDAEL_BLOCKSIZE;
-		for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
-			plain[j] ^= ivp[j];
-	}
-	memcpy(iv, ivsaved, RIJNDAEL_BLOCKSIZE);
-}
-
-Cipher ciphers[] = {
-	{ "none",
-		SSH_CIPHER_NONE, 8, 0,
-		none_setkey, none_setiv,
-		none_crypt, none_crypt },
-	{ "des",
-		SSH_CIPHER_DES, 8, 8,
-		des_ssh1_setkey, des_ssh1_setiv,
-		des_ssh1_encrypt, des_ssh1_decrypt },
-	{ "3des",
-		SSH_CIPHER_3DES, 8, 16,
-		des3_ssh1_setkey, des3_setiv,
-		des3_ssh1_encrypt, des3_ssh1_decrypt },
-	{ "blowfish",
-		SSH_CIPHER_BLOWFISH, 8, 16,
-		blowfish_setkey, blowfish_setiv,
-		blowfish_ssh1_encrypt, blowfish_ssh1_decrypt },
-
-	{ "3des-cbc",
-		SSH_CIPHER_SSH2, 8, 24,
-		des3_setkey, des3_setiv,
-		des3_cbc_encrypt, des3_cbc_decrypt },
-	{ "blowfish-cbc",
-		SSH_CIPHER_SSH2, 8, 16,
-		blowfish_setkey, blowfish_setiv,
-		blowfish_cbc_encrypt, blowfish_cbc_decrypt },
-	{ "cast128-cbc",
-		SSH_CIPHER_SSH2, 8, 16,
-		cast_setkey, cast_setiv,
-		cast_cbc_encrypt, cast_cbc_decrypt },
-	{ "arcfour",
-		SSH_CIPHER_SSH2, 8, 16,
-		arcfour_setkey, none_setiv,
-		arcfour_crypt, arcfour_crypt },
-	{ "aes128-cbc",
-		SSH_CIPHER_SSH2, 16, 16,
-		rijndael_setkey, rijndael_setiv,
-		rijndael_cbc_encrypt, rijndael_cbc_decrypt },
-	{ "aes192-cbc",
-		SSH_CIPHER_SSH2, 16, 24,
-		rijndael_setkey, rijndael_setiv,
-		rijndael_cbc_encrypt, rijndael_cbc_decrypt },
-	{ "aes256-cbc",
-		SSH_CIPHER_SSH2, 16, 32,
-		rijndael_setkey, rijndael_setiv,
-		rijndael_cbc_encrypt, rijndael_cbc_decrypt },
-	{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL, NULL, NULL, NULL }
+	EVP_CIPHER	*(*evptype)(void);
+} ciphers[] = {
+	{ "none", 		SSH_CIPHER_NONE, 8, 0, EVP_enc_null },
+	{ "des", 		SSH_CIPHER_DES, 8, 8, EVP_des_cbc },
+	{ "3des", 		SSH_CIPHER_3DES, 8, 16, evp_ssh1_3des },
+	{ "blowfish", 		SSH_CIPHER_BLOWFISH, 8, 32, evp_ssh1_bf },
+
+	{ "3des-cbc", 		SSH_CIPHER_SSH2, 8, 24, EVP_des_ede3_cbc },
+	{ "blowfish-cbc", 	SSH_CIPHER_SSH2, 8, 16, EVP_bf_cbc },
+	{ "cast128-cbc", 	SSH_CIPHER_SSH2, 8, 16, EVP_cast5_cbc },
+	{ "arcfour", 		SSH_CIPHER_SSH2, 8, 16, EVP_rc4 },
+	{ "aes128-cbc", 	SSH_CIPHER_SSH2, 16, 16, evp_rijndael },
+	{ "aes192-cbc", 	SSH_CIPHER_SSH2, 16, 24, evp_rijndael },
+	{ "aes256-cbc", 	SSH_CIPHER_SSH2, 16, 32, evp_rijndael },
+
+	{ NULL,			SSH_CIPHER_ILLEGAL, 0, 0, NULL }
 };
 
 /*--*/
 
-u_int   
+u_int	
 cipher_blocksize(Cipher *c)
 {
 	return (c->block_size);
 }
-
-u_int   
+u_int	
 cipher_keylen(Cipher *c)
 {
 	return (c->key_len);
@@ -502,9 +166,25 @@ cipher_name(int id)
 }
 
 void
-cipher_init(CipherContext *cc, Cipher *cipher, const u_char *key,
-     u_int keylen, const u_char *iv, u_int ivlen, int encrypt)
+cipher_init(CipherContext *cc, Cipher *cipher,
+    const u_char *key, u_int keylen, const u_char *iv, u_int ivlen,
+    int encrypt)
 {
+	static int dowarn = 1;
+	const EVP_CIPHER *type;
+	int klen;
+
+	if (cipher->number == SSH_CIPHER_DES) {
+		if (dowarn) {
+			error("Warning: use of DES is strongly discouraged "
+			    "due to cryptographic weaknesses");
+			dowarn = 0;
+		}
+		if (keylen > 8)
+			keylen = 8;
+	}
+	cc->plaintext = (cipher->number == SSH_CIPHER_NONE);
+
 	if (keylen < cipher->key_len)
 		fatal("cipher_init: key length %d is insufficient for %s.",
 		    keylen, cipher->name);
@@ -512,9 +192,24 @@ cipher_init(CipherContext *cc, Cipher *cipher, const u_char *key,
 		fatal("cipher_init: iv length %d is insufficient for %s.",
 		    ivlen, cipher->name);
 	cc->cipher = cipher;
-	cc->encrypt = (encrypt == CIPHER_ENCRYPT);
-	cipher->setkey(cc, key, keylen);
-	cipher->setiv(cc, iv, ivlen);
+
+	type = (*cipher->evptype)();
+
+	EVP_CIPHER_CTX_init(&cc->evp);
+	if (EVP_CipherInit(&cc->evp, type, NULL, (u_char *)iv,
+	    (encrypt == CIPHER_ENCRYPT)) == 0)
+		fatal("cipher_init: EVP_CipherInit failed for %s",
+		    cipher->name);
+	klen = EVP_CIPHER_CTX_key_length(&cc->evp);
+	if (klen > 0 && keylen != klen) {
+		debug("cipher_init: set keylen (%d -> %d)", klen, keylen);
+		if (EVP_CIPHER_CTX_set_key_length(&cc->evp, keylen) == 0)
+			fatal("cipher_init: set keylen failed (%d -> %d)",
+			    klen, keylen);
+	}
+	if (EVP_CipherInit(&cc->evp, NULL, (u_char *)key, NULL, -1) == 0)
+		fatal("cipher_init: EVP_CipherInit: set key failed for %s",
+		    cipher->name);
 }
 
 void
@@ -522,16 +217,15 @@ cipher_crypt(CipherContext *cc, u_char *dest, const u_char *src, u_int len)
 {
 	if (len % cc->cipher->block_size)
 		fatal("cipher_encrypt: bad plaintext length %d", len);
-	if (cc->encrypt)
-		cc->cipher->encrypt(cc, dest, src, len);
-	else
-		cc->cipher->decrypt(cc, dest, src, len);
+	if (EVP_Cipher(&cc->evp, dest, (u_char *)src, len) == 0)
+		fatal("evp_crypt: EVP_Cipher failed");
 }
 
 void
 cipher_cleanup(CipherContext *cc)
 {
-	memset(cc, 0, sizeof(*cc));
+	if (EVP_CIPHER_CTX_cleanup(&cc->evp) == 0)
+		error("cipher_cleanup: EVP_CIPHER_CTX_cleanup failed");
 }
 
 /*
@@ -555,3 +249,252 @@ cipher_set_key_string(CipherContext *cc, Cipher *cipher,
 	memset(digest, 0, sizeof(digest));
 	memset(&md, 0, sizeof(md));
 }
+
+/* Implementations for other non-EVP ciphers */
+
+/*
+ * This is used by SSH1:
+ *
+ * What kind of triple DES are these 2 routines?
+ *
+ * Why is there a redundant initialization vector?
+ *
+ * If only iv3 was used, then, this would till effect have been
+ * outer-cbc. However, there is also a private iv1 == iv2 which
+ * perhaps makes differential analysis easier. On the other hand, the
+ * private iv1 probably makes the CRC-32 attack ineffective. This is a
+ * result of that there is no longer any known iv1 to use when
+ * choosing the X block.
+ */
+struct ssh1_3des_ctx
+{
+	EVP_CIPHER_CTX	k1, k2, k3;
+};
+static int
+ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
+    int enc)
+{
+	struct ssh1_3des_ctx *c;
+	u_char *k1, *k2, *k3;
+
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
+		c = xmalloc(sizeof(*c));
+		EVP_CIPHER_CTX_set_app_data(ctx, c);
+	}
+	if (key == NULL)
+		return (1);
+	if (enc == -1)
+		enc = ctx->encrypt;
+	k1 = k2 = k3 = (u_char *) key;
+	k2 += 8;
+	if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) {
+		if (enc)
+			k3 += 16;
+		else
+			k1 += 16;
+	}
+	EVP_CIPHER_CTX_init(&c->k1);
+	EVP_CIPHER_CTX_init(&c->k2);
+	EVP_CIPHER_CTX_init(&c->k3);
+	if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 ||
+	    EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 ||
+	    EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) {
+		memset(c, 0, sizeof(*c));
+		xfree(c);
+		EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+		return (0);
+	}
+	return (1);
+}
+static int
+ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len)
+{
+	struct ssh1_3des_ctx *c;
+
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
+		error("ssh1_3des_cbc: no context");
+		return (0);
+	}
+	if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 ||
+	    EVP_Cipher(&c->k2, dest, dest, len) == 0 ||
+	    EVP_Cipher(&c->k3, dest, dest, len) == 0)
+		return (0);
+	return (1);
+}
+static int
+ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx)
+{
+	struct ssh1_3des_ctx *c;
+
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
+		memset(c, 0, sizeof(*c));
+		xfree(c);
+		EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+	}
+	return (1);
+}
+static EVP_CIPHER *
+evp_ssh1_3des(void)
+{
+	static EVP_CIPHER ssh1_3des;
+
+	memset(&ssh1_3des, 0, sizeof(EVP_CIPHER));
+	ssh1_3des.nid = NID_undef;
+	ssh1_3des.block_size = 8;
+	ssh1_3des.iv_len = 0;
+	ssh1_3des.key_len = 16;
+	ssh1_3des.init = ssh1_3des_init;
+	ssh1_3des.cleanup = ssh1_3des_cleanup;
+	ssh1_3des.do_cipher = ssh1_3des_cbc;
+	ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH;
+	return (&ssh1_3des);
+}
+
+/*
+ * SSH1 uses a variation on Blowfish, all bytes must be swapped before
+ * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
+ */
+static void
+swap_bytes(const u_char *src, u_char *dst, int n)
+{
+	u_char c[4];
+
+	/* Process 4 bytes every lap. */
+	for (n = n / 4; n > 0; n--) {
+		c[3] = *src++;
+		c[2] = *src++;
+		c[1] = *src++;
+		c[0] = *src++;
+
+		*dst++ = c[0];
+		*dst++ = c[1];
+		*dst++ = c[2];
+		*dst++ = c[3];
+	}
+}
+static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL;
+static int
+bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len)
+{
+	int ret;
+
+	swap_bytes(in, out, len);
+	ret = (*orig_bf)(ctx, out, out, len);
+	swap_bytes(out, out, len);
+	return (ret);
+}
+static EVP_CIPHER *
+evp_ssh1_bf(void)
+{
+	static EVP_CIPHER ssh1_bf;
+
+	memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER));
+	orig_bf = ssh1_bf.do_cipher;
+	ssh1_bf.nid = NID_undef;
+	ssh1_bf.do_cipher = bf_ssh1_cipher;
+	ssh1_bf.key_len = 32;
+	return (&ssh1_bf);
+}
+
+/* RIJNDAEL */
+#define RIJNDAEL_BLOCKSIZE 16
+struct ssh_rijndael_ctx
+{
+	rijndael_ctx	r_ctx;
+	u_char		r_iv[RIJNDAEL_BLOCKSIZE];
+};
+
+static int
+ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
+    int enc)
+{
+	struct ssh_rijndael_ctx *c;
+
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
+		c = xmalloc(sizeof(*c));
+		EVP_CIPHER_CTX_set_app_data(ctx, c);
+	}
+	if (key != NULL) {
+		if (enc == -1)
+			enc = ctx->encrypt;
+		rijndael_set_key(&c->r_ctx, (u_char *)key,
+		    8*EVP_CIPHER_CTX_key_length(ctx), enc);
+	}
+	if (iv != NULL)
+		memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
+	return (1);
+}
+static int
+ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
+    u_int len)
+{
+	struct ssh_rijndael_ctx *c;
+	u_char buf[RIJNDAEL_BLOCKSIZE];
+	u_char *cprev, *cnow, *plain, *ivp;
+	int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
+
+	if (len == 0)
+		return (1);
+	if (len % RIJNDAEL_BLOCKSIZE)
+		fatal("ssh_rijndael_cbc: bad len %d", len);
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
+		error("ssh_rijndael_cbc: no context");
+		return (0);
+	}
+	if (ctx->encrypt) {
+		cnow  = dest;
+		plain = (u_char *)src;
+		cprev = c->r_iv;
+		for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE,
+		    cnow+=RIJNDAEL_BLOCKSIZE) {
+			for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
+				buf[j] = plain[j] ^ cprev[j];
+			rijndael_encrypt(&c->r_ctx, buf, cnow);
+			cprev = cnow;
+		}
+		memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE);
+	} else {
+		cnow  = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE);
+		plain = dest+len-RIJNDAEL_BLOCKSIZE;
+
+		memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE);
+		for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
+		    plain-=RIJNDAEL_BLOCKSIZE) {
+			rijndael_decrypt(&c->r_ctx, cnow, plain);
+			ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
+			for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
+				plain[j] ^= ivp[j];
+		}
+		memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
+	}
+	return (1);
+}
+static int
+ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
+{
+	struct ssh_rijndael_ctx *c;
+
+	if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
+		memset(c, 0, sizeof(*c));
+		xfree(c);
+		EVP_CIPHER_CTX_set_app_data(ctx, NULL);
+	}
+	return (1);
+}
+static EVP_CIPHER *
+evp_rijndael(void)
+{
+	static EVP_CIPHER rijndal_cbc;
+
+	memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
+	rijndal_cbc.nid = NID_undef;
+	rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
+	rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
+	rijndal_cbc.key_len = 16;
+	rijndal_cbc.init = ssh_rijndael_init;
+	rijndal_cbc.cleanup = ssh_rijndael_cleanup;
+	rijndal_cbc.do_cipher = ssh_rijndael_cbc;
+	rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
+	    EVP_CIPH_ALWAYS_CALL_INIT;
+	return (&rijndal_cbc);
+}