diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index bd5f13d38450..d4839cf0cb2c 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -37,7 +37,7 @@
 
 extern void mdfour(unsigned char *out, unsigned char *in, int n);
 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
-extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
+extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
 		       unsigned char *p24);
 
 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
@@ -280,25 +280,22 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *ses,
 }
 
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
-void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key)
+void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
+			char *lnm_session_key)
 {
 	int i;
 	char password_with_pad[CIFS_ENCPWD_SIZE];
 
-	if (ses->server == NULL)
-		return;
-
 	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
-	if (ses->password)
-		strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
+	if (password)
+		strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
 
-	if ((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
-		if (extended_security & CIFSSEC_MAY_PLNTXT) {
-			memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
-			memcpy(lnm_session_key, password_with_pad,
-				CIFS_ENCPWD_SIZE);
-			return;
-		}
+	if (!encrypt && extended_security & CIFSSEC_MAY_PLNTXT) {
+		memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
+		memcpy(lnm_session_key, password_with_pad,
+			CIFS_ENCPWD_SIZE);
+		return;
+	}
 
 	/* calculate old style session key */
 	/* calling toupper is less broken than repeatedly
@@ -314,7 +311,8 @@ void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key)
 	for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
 		password_with_pad[i] = toupper(password_with_pad[i]);
 
-	SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key);
+	SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
+
 	/* clear password before we return/free memory */
 	memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 }
diff --git a/fs/cifs/cifsencrypt.h b/fs/cifs/cifsencrypt.h
index 152fa2dcfc6c..15d2ec006474 100644
--- a/fs/cifs/cifsencrypt.h
+++ b/fs/cifs/cifsencrypt.h
@@ -26,7 +26,8 @@
 extern void mdfour(unsigned char *out, unsigned char *in, int n);
 /* smbdes.c */
 extern void E_P16(unsigned char *p14, unsigned char *p16);
-extern void E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24);
+extern void E_P24(unsigned char *p21, const unsigned char *c8,
+		  unsigned char *p24);
 
 
 
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 6f21ecb85ce5..f48616536078 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -330,7 +330,8 @@ extern void CalcNTLMv2_response(const struct cifsSesInfo *, char *);
 extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
 			     const struct nls_table *);
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
-extern void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key);
+extern void calc_lanman_hash(const char *password, const char *cryptkey,
+				bool encrypt, char *lnm_session_key);
 #endif /* CIFS_WEAK_PW_HASH */
 extern int CIFSSMBCopy(int xid,
 			struct cifsTconInfo *source_tcon,
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 6107ee42b093..3a84a375cb6f 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3533,7 +3533,10 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 		if ((extended_security & CIFSSEC_MAY_LANMAN) &&
 			(ses->server->secType == LANMAN))
-			calc_lanman_hash(ses, bcc_ptr);
+			calc_lanman_hash(ses->password, ses->server->cryptKey,
+					 ses->server->secMode &
+					    SECMODE_PW_ENCRYPT ? true : false,
+					 bcc_ptr);
 		else
 #endif /* CIFS_WEAK_PW_HASH */
 		SMBNTencrypt(ses->password,
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 2851d5da0c8c..5f22de7b79a9 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -417,7 +417,10 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 		/* BB calculate hash with password */
 		/* and copy into bcc */
 
-		calc_lanman_hash(ses, lnm_session_key);
+		calc_lanman_hash(ses->password, ses->server->cryptKey,
+				 ses->server->secMode & SECMODE_PW_ENCRYPT ?
+					true : false, lnm_session_key);
+
 		ses->flags |= CIFS_SES_LANMAN;
 		memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESS_KEY_SIZE);
 		bcc_ptr += CIFS_SESS_KEY_SIZE;
diff --git a/fs/cifs/smbdes.c b/fs/cifs/smbdes.c
index 04943c976f98..224a1f478966 100644
--- a/fs/cifs/smbdes.c
+++ b/fs/cifs/smbdes.c
@@ -318,7 +318,8 @@ str_to_key(unsigned char *str, unsigned char *key)
 }
 
 static void
-smbhash(unsigned char *out, unsigned char *in, unsigned char *key, int forw)
+smbhash(unsigned char *out, const unsigned char *in, unsigned char *key,
+	int forw)
 {
 	int i;
 	char *outb; /* outb[64] */
@@ -363,7 +364,7 @@ E_P16(unsigned char *p14, unsigned char *p16)
 }
 
 void
-E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24)
+E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24)
 {
 	smbhash(p24, c8, p21, 1);
 	smbhash(p24 + 8, c8, p21 + 7, 1);
diff --git a/fs/cifs/smbencrypt.c b/fs/cifs/smbencrypt.c
index ff3232fa1015..93fb09a99c69 100644
--- a/fs/cifs/smbencrypt.c
+++ b/fs/cifs/smbencrypt.c
@@ -49,9 +49,10 @@
 
 /*The following definitions come from  libsmb/smbencrypt.c  */
 
-void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
+void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
+		unsigned char *p24);
 void E_md4hash(const unsigned char *passwd, unsigned char *p16);
-static void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
+static void SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
 		   unsigned char p24[24]);
 void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
 
@@ -61,7 +62,7 @@ void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
    encrypted password into p24 */
 /* Note that password must be uppercased and null terminated */
 void
-SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
+SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24)
 {
 	unsigned char p14[15], p21[21];
 
@@ -212,7 +213,7 @@ ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
 
 /* Does the des encryption from the NT or LM MD4 hash. */
 static void
-SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
+SMBOWFencrypt(unsigned char passwd[16], const unsigned char *c8,
 	      unsigned char p24[24])
 {
 	unsigned char p21[21];