X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/5bae4ab8a3d797f4056d957da982ae91e77cfbec..3dc1102ec55da4c4f412db1224270bd3e60962cc:/cipher.c

diff --git a/cipher.c b/cipher.c
index 6edb79c9..361da070 100644
--- a/cipher.c
+++ b/cipher.c
@@ -1,32 +1,29 @@
 /*
+ *
+ * cipher.c
+ *
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ *
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * Created: Wed Apr 19 17:41:39 1995 ylo
+ *
+ */
 
-cipher.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
-                   All rights reserved
-
-Created: Wed Apr 19 17:41:39 1995 ylo
-
-*/
-
-#include "config.h"
 #include "includes.h"
 RCSID("$Id$");
 
 #include "ssh.h"
 #include "cipher.h"
+#include "xmalloc.h"
 
-#ifdef HAVE_OPENSSL
 #include <openssl/md5.h>
-#endif
-#ifdef HAVE_SSL
-#include <ssl/md5.h>
-#endif
 
 /*
- * What kind of tripple DES are these 2 routines?
+ * This is used by SSH1:
+ *
+ * What kind of triple DES are these 2 routines?
  *
  * Why is there a redundant initialization vector?
  *
@@ -39,272 +36,426 @@ RCSID("$Id$");
  */
 void
 SSH_3CBC_ENCRYPT(des_key_schedule ks1,
-		 des_key_schedule ks2, des_cblock *iv2,
-		 des_key_schedule ks3, des_cblock *iv3, 
-		 void *dest, void *src,
+		 des_key_schedule ks2, des_cblock * iv2,
+		 des_key_schedule ks3, des_cblock * iv3,
+		 unsigned char *dest, unsigned char *src,
 		 unsigned int len)
 {
-  des_cblock iv1;
+	des_cblock iv1;
 
-  memcpy(&iv1, iv2, 8);
+	memcpy(&iv1, iv2, 8);
 
-  des_cbc_encrypt(src, dest, len, ks1, &iv1, DES_ENCRYPT);
-  memcpy(&iv1, dest + len - 8, 8);
+	des_cbc_encrypt(src, dest, len, ks1, &iv1, DES_ENCRYPT);
+	memcpy(&iv1, dest + len - 8, 8);
 
-  des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_DECRYPT);
-  memcpy(iv2, &iv1, 8);		/* Note how iv1 == iv2 on entry and exit. */
+	des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_DECRYPT);
+	memcpy(iv2, &iv1, 8);	/* Note how iv1 == iv2 on entry and exit. */
 
-  des_cbc_encrypt(dest, dest, len, ks3, iv3, DES_ENCRYPT);
-  memcpy(iv3, dest + len - 8, 8);
+	des_cbc_encrypt(dest, dest, len, ks3, iv3, DES_ENCRYPT);
+	memcpy(iv3, dest + len - 8, 8);
 }
 
 void
 SSH_3CBC_DECRYPT(des_key_schedule ks1,
-		 des_key_schedule ks2, des_cblock *iv2,
-		 des_key_schedule ks3, des_cblock *iv3,
-		 void *dest, void *src,
+		 des_key_schedule ks2, des_cblock * iv2,
+		 des_key_schedule ks3, des_cblock * iv3,
+		 unsigned char *dest, unsigned char *src,
 		 unsigned int len)
 {
-  des_cblock iv1;
+	des_cblock iv1;
 
-  memcpy(&iv1, iv2, 8);
+	memcpy(&iv1, iv2, 8);
 
-  des_cbc_encrypt(src, dest, len, ks3, iv3, DES_DECRYPT);
-  memcpy(iv3, src + len - 8, 8);
+	des_cbc_encrypt(src, dest, len, ks3, iv3, DES_DECRYPT);
+	memcpy(iv3, src + len - 8, 8);
 
-  des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_ENCRYPT);
-  memcpy(iv2, dest + len - 8, 8);
+	des_cbc_encrypt(dest, dest, len, ks2, iv2, DES_ENCRYPT);
+	memcpy(iv2, dest + len - 8, 8);
 
-  des_cbc_encrypt(dest, dest, len, ks1, &iv1, DES_DECRYPT);
-  /* memcpy(&iv1, iv2, 8); */	/* Note how iv1 == iv2 on entry and exit. */
+	des_cbc_encrypt(dest, dest, len, ks1, &iv1, DES_DECRYPT);
+	/* memcpy(&iv1, iv2, 8); */
+	/* Note how iv1 == iv2 on entry and exit. */
 }
 
 /*
- * SSH uses a variation on Blowfish, all bytes must be swapped before
+ * SSH1 uses a variation on Blowfish, all bytes must be swapped before
  * and after encryption/decryption. Thus the swap_bytes stuff (yuk).
  */
-static
-void
+static void
 swap_bytes(const unsigned char *src, unsigned char *dst_, int n)
 {
-  u_int32_t *dst = (u_int32_t *)dst_;	/* dst must be properly aligned. */
-  union {
-    u_int32_t i;
-    char c[4];
-  } t;
-
-  /* Process 8 bytes every lap. */
-  for (n = n / 8; n > 0; n--)
-    {
-      t.c[3] = *src++;
-      t.c[2] = *src++;
-      t.c[1] = *src++;
-      t.c[0] = *src++;
-      *dst++ = t.i;
-      
-      t.c[3] = *src++;
-      t.c[2] = *src++;
-      t.c[1] = *src++;
-      t.c[0] = *src++;
-      *dst++ = t.i;
-    }
-}
-
-void (*cipher_attack_detected)(const char *fmt, ...) = fatal;
-
-static inline
-void
-detect_cbc_attack(const unsigned char *src,
-		  unsigned int len)
-{
-  return;
-  
-  log("CRC-32 CBC insertion attack detected");
-  cipher_attack_detected("CRC-32 CBC insertion attack detected");
+	/* dst must be properly aligned. */
+	u_int32_t *dst = (u_int32_t *) dst_;
+	union {
+		u_int32_t i;
+		char c[4];
+	} t;
+
+	/* Process 8 bytes every lap. */
+	for (n = n / 8; n > 0; n--) {
+		t.c[3] = *src++;
+		t.c[2] = *src++;
+		t.c[1] = *src++;
+		t.c[0] = *src++;
+		*dst++ = t.i;
+
+		t.c[3] = *src++;
+		t.c[2] = *src++;
+		t.c[1] = *src++;
+		t.c[0] = *src++;
+		*dst++ = t.i;
+	}
 }
 
-/* Names of all encryption algorithms.  These must match the numbers defined
-   int cipher.h. */
+/*
+ * Names of all encryption algorithms.
+ * These must match the numbers defined in cipher.h.
+ */
 static char *cipher_names[] =
 {
-  "none",
-  "idea",
-  "des",
-  "3des",
-  "tss",
-  "rc4",
-  "blowfish"
+	"none",
+	"idea",
+	"des",
+	"3des",
+	"tss",
+	"rc4",
+	"blowfish",
+	"reserved",
+	"blowfish-cbc",
+	"3des-cbc",
+	"arcfour",
+	"cast128-cbc"
 };
 
-/* Returns a bit mask indicating which ciphers are supported by this
-   implementation.  The bit mask has the corresponding bit set of each
-   supported cipher. */
+/*
+ * Returns a bit mask indicating which ciphers are supported by this
+ * implementation.  The bit mask has the corresponding bit set of each
+ * supported cipher.
+ */
 
-unsigned int cipher_mask()
+unsigned int
+cipher_mask1()
+{
+	unsigned int mask = 0;
+	mask |= 1 << SSH_CIPHER_3DES;		/* Mandatory */
+	mask |= 1 << SSH_CIPHER_BLOWFISH;
+	return mask;
+}
+unsigned int
+cipher_mask2()
 {
-  unsigned int mask = 0;
-  mask |= 1 << SSH_CIPHER_3DES;	/* Mandatory */
-  mask |= 1 << SSH_CIPHER_BLOWFISH;
-  return mask;
+	unsigned int mask = 0;
+	mask |= 1 << SSH_CIPHER_BLOWFISH_CBC;
+	mask |= 1 << SSH_CIPHER_3DES_CBC;
+	mask |= 1 << SSH_CIPHER_ARCFOUR;
+	mask |= 1 << SSH_CIPHER_CAST128_CBC;
+	return mask;
+}
+unsigned int
+cipher_mask()
+{
+	return cipher_mask1() | cipher_mask2();
 }
 
 /* Returns the name of the cipher. */
 
-const
-char *cipher_name(int cipher)
+const char *
+cipher_name(int cipher)
+{
+	if (cipher < 0 || cipher >= sizeof(cipher_names) / sizeof(cipher_names[0]) ||
+	    cipher_names[cipher] == NULL)
+		fatal("cipher_name: bad cipher name: %d", cipher);
+	return cipher_names[cipher];
+}
+
+/* Returns 1 if the name of the ciphers are valid. */
+
+#define	CIPHER_SEP	","
+int
+ciphers_valid(const char *names)
 {
-  if (cipher < 0 || cipher >= sizeof(cipher_names) / sizeof(cipher_names[0]) ||
-	cipher_names[cipher] == NULL)
-    fatal("cipher_name: bad cipher number: %d", cipher);
-  return cipher_names[cipher];
+	char *ciphers;
+	char *p;
+	int i;
+
+	if (strcmp(names, "") == 0)
+		return 0;
+	ciphers = xstrdup(names);
+	for ((p = strtok(ciphers, CIPHER_SEP)); p; (p = strtok(NULL, CIPHER_SEP))) {
+		i = cipher_number(p);
+		if (i == -1 || !(cipher_mask2() & (1 << i))) {
+			xfree(ciphers);
+			return 0;
+		}
+	}
+	xfree(ciphers);
+	return 1;
 }
 
-/* Parses the name of the cipher.  Returns the number of the corresponding
-   cipher, or -1 on error. */
+/*
+ * Parses the name of the cipher.  Returns the number of the corresponding
+ * cipher, or -1 on error.
+ */
 
 int
 cipher_number(const char *name)
 {
-  int i;
-  for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++)
-    if (strcmp(cipher_names[i], name) == 0 &&
-	(cipher_mask() & (1 << i)))
-      return i;
-  return -1;
+	int i;
+	for (i = 0; i < sizeof(cipher_names) / sizeof(cipher_names[0]); i++)
+		if (strcmp(cipher_names[i], name) == 0 &&
+		    (cipher_mask() & (1 << i)))
+			return i;
+	return -1;
 }
 
-/* Selects the cipher, and keys if by computing the MD5 checksum of the
-   passphrase and using the resulting 16 bytes as the key. */
+/*
+ * Selects the cipher, and keys if by computing the MD5 checksum of the
+ * passphrase and using the resulting 16 bytes as the key.
+ */
 
-void cipher_set_key_string(CipherContext *context, int cipher,
-			   const char *passphrase, int for_encryption)
+void
+cipher_set_key_string(CipherContext *context, int cipher, const char *passphrase)
 {
-  MD5_CTX md;
-  unsigned char digest[16];
-  
-  MD5_Init(&md);
-  MD5_Update(&md, (const unsigned char *)passphrase, strlen(passphrase));
-  MD5_Final(digest, &md);
-
-  cipher_set_key(context, cipher, digest, 16, for_encryption);
-  
-  memset(digest, 0, sizeof(digest));
-  memset(&md, 0, sizeof(md));
+	MD5_CTX md;
+	unsigned char digest[16];
+
+	MD5_Init(&md);
+	MD5_Update(&md, (const unsigned char *) passphrase, strlen(passphrase));
+	MD5_Final(digest, &md);
+
+	cipher_set_key(context, cipher, digest, 16);
+
+	memset(digest, 0, sizeof(digest));
+	memset(&md, 0, sizeof(md));
 }
 
 /* Selects the cipher to use and sets the key. */
 
-void cipher_set_key(CipherContext *context, int cipher,
-		    const unsigned char *key, int keylen, int for_encryption)
+void
+cipher_set_key(CipherContext *context, int cipher, const unsigned char *key,
+    int keylen)
 {
-  unsigned char padded[32];
-
-  /* Set cipher type. */
-  context->type = cipher;
-
-  /* Get 32 bytes of key data.  Pad if necessary.  (So that code below does
-     not need to worry about key size). */
-  memset(padded, 0, sizeof(padded));
-  memcpy(padded, key, keylen < sizeof(padded) ? keylen : sizeof(padded));
-
-  /* Initialize the initialization vector. */
-  switch (cipher)
-    {
-    case SSH_CIPHER_NONE:
-      /* Has to stay for authfile saving of private key with no passphrase */
-      break;
-
-    case SSH_CIPHER_3DES:
-      /* Note: the least significant bit of each byte of key is parity, 
-	 and must be ignored by the implementation.  16 bytes of key are
-	 used (first and last keys are the same). */
-      if (keylen < 16)
-	error("Key length %d is insufficient for 3DES.", keylen);
-      des_set_key((void*)padded, context->u.des3.key1);
-      des_set_key((void*)(padded + 8), context->u.des3.key2);
-      if (keylen <= 16)
-	des_set_key((void*)padded, context->u.des3.key3);
-      else
-	des_set_key((void*)(padded + 16), context->u.des3.key3);
-      memset(context->u.des3.iv2, 0, sizeof(context->u.des3.iv2));
-      memset(context->u.des3.iv3, 0, sizeof(context->u.des3.iv3));
-      break;
-
-    case SSH_CIPHER_BLOWFISH:
-      BF_set_key(&context->u.bf.key, keylen, padded);
-      memset(context->u.bf.iv, 0, 8);
-      break;
-
-    default:
-      fatal("cipher_set_key: unknown cipher: %d", cipher);
-    }
-  memset(padded, 0, sizeof(padded));
+	unsigned char padded[32];
+
+	/* Set cipher type. */
+	context->type = cipher;
+
+	/* Get 32 bytes of key data.  Pad if necessary.  (So that code
+	   below does not need to worry about key size). */
+	memset(padded, 0, sizeof(padded));
+	memcpy(padded, key, keylen < sizeof(padded) ? keylen : sizeof(padded));
+
+	/* Initialize the initialization vector. */
+	switch (cipher) {
+	case SSH_CIPHER_NONE:
+		/*
+		 * Has to stay for authfile saving of private key with no
+		 * passphrase
+		 */
+		break;
+
+	case SSH_CIPHER_3DES:
+		/*
+		 * Note: the least significant bit of each byte of key is
+		 * parity, and must be ignored by the implementation.  16
+		 * bytes of key are used (first and last keys are the same).
+		 */
+		if (keylen < 16)
+			error("Key length %d is insufficient for 3DES.", keylen);
+		des_set_key((void *) padded, context->u.des3.key1);
+		des_set_key((void *) (padded + 8), context->u.des3.key2);
+		if (keylen <= 16)
+			des_set_key((void *) padded, context->u.des3.key3);
+		else
+			des_set_key((void *) (padded + 16), context->u.des3.key3);
+		memset(context->u.des3.iv2, 0, sizeof(context->u.des3.iv2));
+		memset(context->u.des3.iv3, 0, sizeof(context->u.des3.iv3));
+		break;
+
+	case SSH_CIPHER_BLOWFISH:
+		if (keylen < 16)
+			error("Key length %d is insufficient for blowfish.", keylen);
+		BF_set_key(&context->u.bf.key, keylen, padded);
+		memset(context->u.bf.iv, 0, 8);
+		break;
+
+	case SSH_CIPHER_3DES_CBC:
+	case SSH_CIPHER_BLOWFISH_CBC:
+	case SSH_CIPHER_ARCFOUR:
+	case SSH_CIPHER_CAST128_CBC:
+		fatal("cipher_set_key: illegal cipher: %s", cipher_name(cipher));
+		break;
+
+	default:
+		fatal("cipher_set_key: unknown cipher: %s", cipher_name(cipher));
+	}
+	memset(padded, 0, sizeof(padded));
+}
+
+void
+cipher_set_key_iv(CipherContext * context, int cipher,
+    const unsigned char *key, int keylen,
+    const unsigned char *iv, int ivlen)
+{
+	/* Set cipher type. */
+	context->type = cipher;
+
+	/* Initialize the initialization vector. */
+	switch (cipher) {
+	case SSH_CIPHER_NONE:
+		break;
+
+	case SSH_CIPHER_3DES:
+	case SSH_CIPHER_BLOWFISH:
+		fatal("cipher_set_key_iv: illegal cipher: %s", cipher_name(cipher));
+		break;
+
+	case SSH_CIPHER_3DES_CBC:
+		if (keylen < 24)
+			error("Key length %d is insufficient for 3des-cbc.", keylen);
+		des_set_key((void *) key, context->u.des3.key1);
+		des_set_key((void *) (key+8), context->u.des3.key2);
+		des_set_key((void *) (key+16), context->u.des3.key3);
+		if (ivlen < 8)
+			error("IV length %d is insufficient for 3des-cbc.", ivlen);
+		memcpy(context->u.des3.iv3, (char *)iv, 8);
+		break;
+
+	case SSH_CIPHER_BLOWFISH_CBC:
+		if (keylen < 16)
+			error("Key length %d is insufficient for blowfish.", keylen);
+		if (ivlen < 8)
+			error("IV length %d is insufficient for blowfish.", ivlen);
+		BF_set_key(&context->u.bf.key, keylen, (unsigned char *)key);
+		memcpy(context->u.bf.iv, (char *)iv, 8);
+		break;
+
+	case SSH_CIPHER_ARCFOUR:
+		if (keylen < 16)
+			error("Key length %d is insufficient for arcfour.", keylen);
+		RC4_set_key(&context->u.rc4, keylen, (unsigned char *)key);
+		break;
+
+	case SSH_CIPHER_CAST128_CBC:
+		if (keylen < 16)
+			error("Key length %d is insufficient for cast128.", keylen);
+		if (ivlen < 8)
+			error("IV length %d is insufficient for cast128.", ivlen);
+		CAST_set_key(&context->u.cast.key, keylen, (unsigned char *) key);
+		memcpy(context->u.cast.iv, (char *)iv, 8);
+		break;
+
+	default:
+		fatal("cipher_set_key: unknown cipher: %s", cipher_name(cipher));
+	}
 }
 
 /* Encrypts data using the cipher. */
 
-void cipher_encrypt(CipherContext *context, unsigned char *dest,
-		    const unsigned char *src, unsigned int len)
+void
+cipher_encrypt(CipherContext *context, unsigned char *dest,
+	       const unsigned char *src, unsigned int len)
 {
-  if ((len & 7) != 0)
-    fatal("cipher_encrypt: bad plaintext length %d", len);
-
-  switch (context->type)
-    {
-    case SSH_CIPHER_NONE:
-      memcpy(dest, src, len);
-      break;
-
-    case SSH_CIPHER_3DES:
-      SSH_3CBC_ENCRYPT(context->u.des3.key1,
-		       context->u.des3.key2, &context->u.des3.iv2,
-		       context->u.des3.key3, &context->u.des3.iv3,
-		       dest, (void*)src, len);
-      break;
-
-    case SSH_CIPHER_BLOWFISH:
-      swap_bytes(src, dest, len);
-      BF_cbc_encrypt(dest, dest, len,
-		     &context->u.bf.key, context->u.bf.iv, BF_ENCRYPT);
-      swap_bytes(dest, dest, len);
-      break;
-
-    default:
-      fatal("cipher_encrypt: unknown cipher: %d", context->type);
-    }
+	if ((len & 7) != 0)
+		fatal("cipher_encrypt: bad plaintext length %d", len);
+
+	switch (context->type) {
+	case SSH_CIPHER_NONE:
+		memcpy(dest, src, len);
+		break;
+
+	case SSH_CIPHER_3DES:
+		SSH_3CBC_ENCRYPT(context->u.des3.key1,
+				 context->u.des3.key2, &context->u.des3.iv2,
+				 context->u.des3.key3, &context->u.des3.iv3,
+				 dest, (unsigned char *) src, len);
+		break;
+
+	case SSH_CIPHER_BLOWFISH:
+		swap_bytes(src, dest, len);
+		BF_cbc_encrypt(dest, dest, len,
+			       &context->u.bf.key, context->u.bf.iv,
+			       BF_ENCRYPT);
+		swap_bytes(dest, dest, len);
+		break;
+
+	case SSH_CIPHER_BLOWFISH_CBC:
+		BF_cbc_encrypt((void *)src, dest, len,
+			       &context->u.bf.key, context->u.bf.iv,
+			       BF_ENCRYPT);
+		break;
+
+	case SSH_CIPHER_3DES_CBC:
+		des_ede3_cbc_encrypt(src, dest, len,
+		    context->u.des3.key1, context->u.des3.key2,
+		    context->u.des3.key3, &context->u.des3.iv3, DES_ENCRYPT);
+		break;
+
+	case SSH_CIPHER_ARCFOUR:
+		RC4(&context->u.rc4, len, (unsigned char *)src, dest);
+		break;
+
+	case SSH_CIPHER_CAST128_CBC:
+		CAST_cbc_encrypt(src, dest, len,
+		    &context->u.cast.key, context->u.cast.iv, CAST_ENCRYPT);
+		break;
+
+	default:
+		fatal("cipher_encrypt: unknown cipher: %s", cipher_name(context->type));
+	}
 }
-  
+
 /* Decrypts data using the cipher. */
 
-void cipher_decrypt(CipherContext *context, unsigned char *dest,
-		    const unsigned char *src, unsigned int len)
+void
+cipher_decrypt(CipherContext *context, unsigned char *dest,
+	       const unsigned char *src, unsigned int len)
 {
-  if ((len & 7) != 0)
-    fatal("cipher_decrypt: bad ciphertext length %d", len);
-
-  switch (context->type)
-    {
-    case SSH_CIPHER_NONE:
-      memcpy(dest, src, len);
-      break;
-
-    case SSH_CIPHER_3DES:
-      /* CRC-32 attack? */
-      SSH_3CBC_DECRYPT(context->u.des3.key1,
-		       context->u.des3.key2, &context->u.des3.iv2,
-		       context->u.des3.key3, &context->u.des3.iv3,
-		       dest, (void*)src, len);
-      break;
-
-    case SSH_CIPHER_BLOWFISH:
-      detect_cbc_attack(src, len);
-      swap_bytes(src, dest, len);
-      BF_cbc_encrypt((void*)dest, dest, len,
-		     &context->u.bf.key, context->u.bf.iv, BF_DECRYPT);
-      swap_bytes(dest, dest, len);
-      break;
-
-    default:
-      fatal("cipher_decrypt: unknown cipher: %d", context->type);
-    }
+	if ((len & 7) != 0)
+		fatal("cipher_decrypt: bad ciphertext length %d", len);
+
+	switch (context->type) {
+	case SSH_CIPHER_NONE:
+		memcpy(dest, src, len);
+		break;
+
+	case SSH_CIPHER_3DES:
+		SSH_3CBC_DECRYPT(context->u.des3.key1,
+				 context->u.des3.key2, &context->u.des3.iv2,
+				 context->u.des3.key3, &context->u.des3.iv3,
+				 dest, (unsigned char *) src, len);
+		break;
+
+	case SSH_CIPHER_BLOWFISH:
+		swap_bytes(src, dest, len);
+		BF_cbc_encrypt((void *) dest, dest, len,
+			       &context->u.bf.key, context->u.bf.iv,
+			       BF_DECRYPT);
+		swap_bytes(dest, dest, len);
+		break;
+
+	case SSH_CIPHER_BLOWFISH_CBC:
+		BF_cbc_encrypt((void *) src, dest, len,
+			       &context->u.bf.key, context->u.bf.iv,
+			       BF_DECRYPT);
+		break;
+
+	case SSH_CIPHER_3DES_CBC:
+		des_ede3_cbc_encrypt(src, dest, len,
+		    context->u.des3.key1, context->u.des3.key2,
+		    context->u.des3.key3, &context->u.des3.iv3, DES_DECRYPT);
+		break;
+
+	case SSH_CIPHER_ARCFOUR:
+		RC4(&context->u.rc4, len, (unsigned char *)src, dest);
+		break;
+
+	case SSH_CIPHER_CAST128_CBC:
+		CAST_cbc_encrypt(src, dest, len,
+		    &context->u.cast.key, context->u.cast.iv, CAST_DECRYPT);
+		break;
+
+	default:
+		fatal("cipher_decrypt: unknown cipher: %s", cipher_name(context->type));
+	}
 }