--- src/AES.c

+++ src/AES.c

@@ -26,6 +26,7 @@

 #include <assert.h>

 #include <stdlib.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #define MODULE_NAME _AES

--- src/ARC2.c

+++ src/ARC2.c

@@ -42,6 +42,7 @@

  */

 #include <string.h>  

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #define MODULE_NAME _ARC2

--- src/block_template.c

+++ src/block_template.c

@@ -33,6 +33,7 @@

 #include <string.h>

 #endif

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

 #include "modsupport.h" 

@@ -123,7 +124,8 @@ ALGnew(PyObject *self, PyObject *args, P

 {

 	unsigned char *key, *IV;

 	ALGobject * new=NULL;

-	int keylen, IVlen=0, mode=MODE_ECB, segment_size=0;

+	Py_ssize_t keylen, IVlen=0;

+	int mode=MODE_ECB, segment_size=0;

 	PyObject *counter = NULL;

 	int counter_shortcut = 0;

 #ifdef PCT_ARC2_MODULE

@@ -161,7 +163,7 @@ ALGnew(PyObject *self, PyObject *args, P

 	{

 		PyErr_Format(PyExc_ValueError,

 			     "Key must be %i bytes long, not %i",

-			     KEY_SIZE, keylen);

+			     KEY_SIZE, (int)keylen);

 		return NULL;

 	}

 	if (KEY_SIZE==0 && keylen==0)

@@ -242,7 +244,7 @@ ALGnew(PyObject *self, PyObject *args, P

         new->st.effective_keylen = effective_keylen;

 #endif

-	block_init(&(new->st), key, keylen);

+	block_init(&(new->st), key, (int)keylen);

 	if (PyErr_Occurred())

 	{

 		Py_DECREF(new);

@@ -250,7 +252,7 @@ ALGnew(PyObject *self, PyObject *args, P

 	}

 	memset(new->IV, 0, BLOCK_SIZE);

 	memset(new->oldCipher, 0, BLOCK_SIZE);

-	memcpy(new->IV, IV, IVlen);

+	memcpy(new->IV, IV, (size_t)IVlen);

 	new->mode = mode;

 	new->count=BLOCK_SIZE;   /* stores how many bytes in new->oldCipher have been used */

 	return new;

@@ -264,7 +266,8 @@ ALG_Encrypt(ALGobject *self, PyObject *a

 {

 	unsigned char *buffer, *str;

 	unsigned char temp[BLOCK_SIZE];

-	int i, j, len;

+	int i, j;

+	Py_ssize_t len;

 	PyObject *result;

 	if (!PyArg_Parse(args, "s#", &str, &len))

@@ -292,7 +295,7 @@ ALG_Encrypt(ALGobject *self, PyObject *a

 		return NULL;

 	}

-	buffer=malloc(len);

+	buffer=malloc((size_t)len);

 	if (buffer==NULL) 

 	{

 		PyErr_SetString(PyExc_MemoryError, 

@@ -496,7 +499,8 @@ ALG_Decrypt(ALGobject *self, PyObject *a

 {

 	unsigned char *buffer, *str;

 	unsigned char temp[BLOCK_SIZE];

-	int i, j, len;

+	int i, j;

+	Py_ssize_t len;

 	PyObject *result;

 	/* CTR mode decryption is identical to encryption */

@@ -525,7 +529,7 @@ ALG_Decrypt(ALGobject *self, PyObject *a

 			     self->segment_size/8);

 		return NULL;

 	}

-	buffer=malloc(len);

+	buffer=malloc((size_t)len);

 	if (buffer==NULL) 

 	{

 		PyErr_SetString(PyExc_MemoryError, 

--- src/Blowfish.c

+++ src/Blowfish.c

@@ -36,6 +36,7 @@

 #endif

 #include <assert.h>

 #include <string.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "Blowfish-tables.h"

--- src/CAST.c

+++ src/CAST.c

@@ -42,6 +42,7 @@

 */

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #define MODULE_NAME _CAST

--- src/DES.c

+++ src/DES.c

@@ -34,6 +34,7 @@

 #undef DES  /* this is needed because tomcrypt_custom.h defines DES to an empty string */

 #include <assert.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 typedef struct {

--- src/hash_template.c

+++ src/hash_template.c

@@ -30,6 +30,7 @@

 #ifdef _HAVE_STDC_HEADERS

 #include <string.h>

 #endif

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

@@ -163,7 +164,7 @@ static PyObject *

 ALG_update(ALGobject *self, PyObject *args)

 {

 	unsigned char *cp;

-	int len;

+	Py_ssize_t len;

 	if (!PyArg_ParseTuple(args, "s#", &cp, &len))

 		return NULL;

@@ -273,7 +274,7 @@ ALG_new(PyObject *self, PyObject *args)

 {

         ALGobject *new;

 	unsigned char *cp = NULL;

-	int len;

+	Py_ssize_t len;

 	if ((new = newALGobject()) == NULL)

 		return NULL;

--- src/MD2.c

+++ src/MD2.c

@@ -28,6 +28,7 @@

 #include <string.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

--- src/MD4.c

+++ src/MD4.c

@@ -28,6 +28,7 @@

 #include <string.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

--- src/RIPEMD160.c

+++ src/RIPEMD160.c

@@ -54,6 +54,7 @@

 #include <assert.h>

 #include <string.h>

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

--- src/stream_template.c

+++ src/stream_template.c

@@ -33,6 +33,7 @@

 #include <string.h>

 #endif

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #include "pycrypto_compat.h"

 #include "modsupport.h"

@@ -100,7 +101,7 @@ ALGnew(PyObject *self, PyObject *args, P

 {

 	unsigned char *key;

 	ALGobject * new;

-	int keylen;

+	Py_ssize_t keylen;

 	new = newALGobject();

 	if (!PyArg_ParseTupleAndKeywords(args, kwdict, "s#", kwlist, 

@@ -124,7 +125,7 @@ ALGnew(PyObject *self, PyObject *args, P

 				"the null string (0 bytes long)");

 		return NULL;

 	}

-	stream_init(&(new->st), key, keylen);

+	stream_init(&(new->st), key, (int)keylen);

 	if (PyErr_Occurred())

 	{

 		Py_DECREF(new);

@@ -140,7 +141,7 @@ static PyObject *

 ALG_Encrypt(ALGobject *self, PyObject *args)

 {

 	unsigned char *buffer, *str;

-	int len;

+	Py_ssize_t len;

 	PyObject *result;

 	if (!PyArg_Parse(args, "s#", &str, &len))

@@ -149,7 +150,7 @@ ALG_Encrypt(ALGobject *self, PyObject *a

 	{

 		return PyBytes_FromStringAndSize(NULL, 0);

 	}

-	buffer = malloc(len);

+	buffer = malloc((size_t)len);

 	if (buffer == NULL)

 	{

 		PyErr_SetString(PyExc_MemoryError, "No memory available in "

@@ -157,8 +158,8 @@ ALG_Encrypt(ALGobject *self, PyObject *a

 		return NULL;

 	}

 	Py_BEGIN_ALLOW_THREADS;

-	memcpy(buffer, str, len);

-	stream_encrypt(&(self->st), buffer, len);

+	memcpy(buffer, str, (size_t)len);

+	stream_encrypt(&(self->st), buffer, (int)len);

 	Py_END_ALLOW_THREADS;

 	result = PyBytes_FromStringAndSize((char *)buffer, len);

 	free(buffer);

@@ -172,7 +173,7 @@ static PyObject *

 ALG_Decrypt(ALGobject *self, PyObject *args)

 {

 	unsigned char *buffer, *str;

-	int len;

+	Py_ssize_t len;

 	PyObject *result;

 	if (!PyArg_Parse(args, "s#", &str, &len))

@@ -181,7 +182,7 @@ ALG_Decrypt(ALGobject *self, PyObject *a

 	{

 		return PyBytes_FromStringAndSize(NULL, 0);

 	}

-	buffer = malloc(len);

+	buffer = malloc((size_t)len);

 	if (buffer == NULL)

 	{

 		PyErr_SetString(PyExc_MemoryError, "No memory available in "

@@ -189,8 +190,8 @@ ALG_Decrypt(ALGobject *self, PyObject *a

 		return NULL;

 	}

 	Py_BEGIN_ALLOW_THREADS;

-	memcpy(buffer, str, len);

-	stream_decrypt(&(self->st), buffer, len);

+	memcpy(buffer, str, (size_t)len);

+	stream_decrypt(&(self->st), buffer, (int)len);

 	Py_END_ALLOW_THREADS;

 	result = PyBytes_FromStringAndSize((char *)buffer, len);

 	free(buffer);

--- src/XOR.c

+++ src/XOR.c

@@ -24,6 +24,7 @@

  * =======================================================================

  */

+#define PY_SSIZE_T_CLEAN

 #include "Python.h"

 #define MODULE_NAME _XOR