===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/cipher.c,v
retrieving revision 1.15
retrieving revision 1.16
diff -u -r1.15 -r1.16
--- src/usr.bin/ssh/cipher.c	1999/11/22 21:02:38	1.15
+++ src/usr.bin/ssh/cipher.c	1999/11/23 22:25:53	1.16
@@ -12,7 +12,7 @@
 */
 
 #include "includes.h"
-RCSID("$Id: cipher.c,v 1.15 1999/11/22 21:02:38 markus Exp $");
+RCSID("$Id: cipher.c,v 1.16 1999/11/23 22:25:53 markus Exp $");
 
 #include "ssh.h"
 #include "cipher.h"
@@ -33,124 +33,124 @@
  */
 void
 SSH_3CBC_ENCRYPT(des_key_schedule ks1,
-		 des_key_schedule ks2, des_cblock *iv2,
-		 des_key_schedule ks3, des_cblock *iv3, 
+		 des_key_schedule ks2, des_cblock * iv2,
+		 des_key_schedule ks3, des_cblock * iv3,
 		 void *dest, void *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,
+		 des_key_schedule ks2, des_cblock * iv2,
+		 des_key_schedule ks3, des_cblock * iv3,
 		 void *dest, void *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
  * 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;
+	/* 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;
-    }
+	/* 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;
+void (*cipher_attack_detected) (const char *fmt,...) = fatal;
 
-static inline
-void
+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");
+	return;
+
+	log("CRC-32 CBC insertion attack detected");
+	cipher_attack_detected("CRC-32 CBC insertion attack detected");
 }
 
 /* Names of all encryption algorithms.  These must match the numbers defined
    int cipher.h. */
 static char *cipher_names[] =
 {
-  "none",
-  "idea",
-  "des",
-  "3des",
-  "tss",
-  "rc4",
-  "blowfish"
+	"none",
+	"idea",
+	"des",
+	"3des",
+	"tss",
+	"rc4",
+	"blowfish"
 };
 
 /* 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_mask()
 {
-  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_3DES;		/* Mandatory */
+	mask |= 1 << SSH_CIPHER_BLOWFISH;
+	return mask;
 }
 
 /* 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 number: %d", cipher);
-  return cipher_names[cipher];
+	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];
 }
 
 /* Parses the name of the cipher.  Returns the number of the corresponding
@@ -159,146 +159,151 @@
 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. */
 
-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, int for_encryption)
 {
-  MD5_CTX md;
-  unsigned char digest[16];
-  
-  MD5_Init(&md);
-  MD5_Update(&md, (const unsigned char *)passphrase, strlen(passphrase));
-  MD5_Final(digest, &md);
+	MD5_CTX md;
+	unsigned char digest[16];
 
-  cipher_set_key(context, cipher, digest, 16, for_encryption);
-  
-  memset(digest, 0, sizeof(digest));
-  memset(&md, 0, sizeof(md));
+	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));
 }
 
 /* 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, int for_encryption)
 {
-  unsigned char padded[32];
+	unsigned char padded[32];
 
-  /* Set cipher type. */
-  context->type = cipher;
+	/* 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));
+	/* 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;
+	/* 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_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;
+	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: %s", cipher_name(cipher));
-    }
-  memset(padded, 0, sizeof(padded));
+	default:
+		fatal("cipher_set_key: unknown cipher: %s", cipher_name(cipher));
+	}
+	memset(padded, 0, sizeof(padded));
 }
 
 /* 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);
+	if ((len & 7) != 0)
+		fatal("cipher_encrypt: bad plaintext length %d", len);
 
-  switch (context->type)
-    {
-    case SSH_CIPHER_NONE:
-      memcpy(dest, src, len);
-      break;
+	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_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;
+	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: %s", cipher_name(context->type));
-    }
+	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);
+	if ((len & 7) != 0)
+		fatal("cipher_decrypt: bad ciphertext length %d", len);
 
-  switch (context->type)
-    {
-    case SSH_CIPHER_NONE:
-      memcpy(dest, src, len);
-      break;
+	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_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;
+	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: %s", cipher_name(context->type));
-    }
+	default:
+		fatal("cipher_decrypt: unknown cipher: %s", cipher_name(context->type));
+	}
 }