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/* Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved. */
/* $Id$ */
%{
#include <openssl/evp.h>
#if OPENSSL_VERSION_NUMBER >= 0x0090800fL
#include <openssl/aes.h>
#endif
/*
// 2004-10-10, ngps:
// CTR mode is not included in the default OpenSSL build.
// To use the AES CTR ciphers, link with your own copy of OpenSSL.
*/
#ifdef HAVE_AES_CTR
extern EVP_CIPHER const *EVP_aes_128_ctr(void);
extern EVP_CIPHER const *EVP_aes_192_ctr(void);
extern EVP_CIPHER const *EVP_aes_256_ctr(void);
#endif
%}
%apply Pointer NONNULL { AES_KEY * };
%constant int AES_BLOCK_SIZE = AES_BLOCK_SIZE;
%inline %{
AES_KEY *aes_new(void) {
AES_KEY *key;
if (!(key = (AES_KEY *)PyMem_Malloc(sizeof(AES_KEY)))) {
PyErr_SetString(PyExc_MemoryError,
"Insufficient memory for AES key.");
return NULL;
}
return key;
}
void AES_free(AES_KEY *key) {
PyMem_Free((void *)key);
}
/*
// op == 0: encrypt
// otherwise: decrypt (Python code will supply the value 1.)
*/
PyObject *AES_set_key(AES_KEY *key, PyObject *value, int bits, int op) {
char *vbuf;
Py_ssize_t vlen;
if (PyBytes_AsStringAndSize(value, &vbuf, &vlen) == -1)
return NULL;
if (op == 0)
AES_set_encrypt_key((const unsigned char *)vbuf, bits, key);
else
AES_set_decrypt_key((const unsigned char *)vbuf, bits, key);
Py_RETURN_NONE;
}
/*
// op == 0: encrypt
// otherwise: decrypt (Python code will supply the value 1.)
*/
PyObject *AES_crypt(const AES_KEY *key, PyObject *in, int outlen, int op) {
char *buf;
Py_ssize_t len;
unsigned char *out;
PyObject *res;
if (PyBytes_AsStringAndSize(in, &buf, &len) == -1)
return NULL;
if (!(out=(unsigned char *)PyMem_Malloc(outlen))) {
PyErr_SetString(PyExc_MemoryError, "AES_crypt");
return NULL;
}
if (op == 0)
AES_encrypt((const unsigned char *)buf, out, key);
else
AES_decrypt((const unsigned char *)buf, out, key);
res = PyBytes_FromStringAndSize((char*)out, outlen);
PyMem_Free(out);
return res;
}
int AES_type_check(AES_KEY *key) {
return 1;
}
%}
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