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/*******************************************************************/
/*
*-------------------------------------------------------------------
*
* CryptoDataHandler --
* EncryptInitialize --
*
* Perform encryption function on a block of data and return result.
* Initialize an encryption function
*
* Returns:
* TCL_OK or TCL_ERROR
* TCL_OK if successful or TCL_ERROR for failure with result set
* to error message.
*
* Side effects:
* Sets result or error message
* No result or error message
*
*-------------------------------------------------------------------
*/
int
Encrypt_DataHandler(Tcl_Interp *interp, int type, Tcl_Obj *dataObj, Tcl_Obj *cipherObj,
Tcl_Obj *digestObj, Tcl_Obj *keyObj, Tcl_Obj *ivObj) {
EVP_CIPHER_CTX *ctx;
char *cipherName = NULL, *data = NULL, *key = NULL, *iv = NULL;
int cipher_len = 0, data_len = 0, key_len = 0, iv_len = 0, out_len = 0, tmplen, res;
char *cipherName = NULL, *key = NULL, *iv = NULL;
int cipher_len = 0, data_len = 0, key_len = 0, iv_len = 0, res;
unsigned char *outbuf;
Tcl_Obj *resultObj;
if (dataObj != NULL) {
data = Tcl_GetByteArrayFromObj(dataObj, &data_len);
} else {
Tcl_AppendResult(interp, "No data", NULL);
}
Tcl_AppendResult(interp, "Invalid cipher: ", cipherName, NULL);
Tcl_AppendResult(interp, "Invalid cipher: \"", cipherName, "\"", NULL);
return TCL_ERROR;
}
/* Allocate storage for encrypted data. Size should be data size + block size. */
resultObj = Tcl_NewObj();
outbuf = Tcl_SetByteArrayLength(resultObj, data_len+1024);
if (resultObj == NULL || outbuf == NULL) {
Tcl_AppendResult(interp, "Memory allocation error", (char *) NULL);
if((ctx = EVP_CIPHER_CTX_new()) == NULL) {
if((*ctx = EVP_CIPHER_CTX_new()) == NULL) {
Tcl_AppendResult(interp, "Memory allocation error", (char *) NULL);
Tcl_DecrRefCount(resultObj);
res = EVP_EncryptInit_ex(ctx, cipher, NULL, key, iv);
res = EVP_EncryptInit_ex(*ctx, cipher, NULL, key, iv);
} else {
res = EVP_DecryptInit_ex(ctx, cipher, NULL, key, iv);
res = EVP_DecryptInit_ex(*ctx, cipher, NULL, key, iv);
}
#else
OSSL_PARAM params[2];
int index = 0;
if (iv != NULL) {
params[index++] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV, (void *) iv, (size_t) iv_len);
}
params[index] = OSSL_PARAM_construct_end();
if (type == TYPE_ENCRYPT) {
res = EVP_EncryptInit_ex2(ctx, cipher, key, iv, params);
} else {
res = EVP_DecryptInit_ex2(ctx, cipher, key, iv, params);
}
#endif
if(!res) {
Tcl_AppendResult(interp, "Initialize failed: ", REASON(), NULL);
Tcl_DecrRefCount(resultObj);
EVP_CIPHER_CTX_free(ctx);
}
/*
*-------------------------------------------------------------------
*
* EncryptUpdate --
*
* Update an encryption function with data
*
* Returns:
* 1 if successful or 0 for failure
*
* Side effects:
* Adds encrypted data to buffer or sets result to error message
*
*-------------------------------------------------------------------
*/
int EncryptUpdate(Tcl_Interp *interp, int type, EVP_CIPHER_CTX *ctx, unsigned char *outbuf,
int *out_len, unsigned char *data, int data_len) {
int res, len = 0;
dprintf("Called");
/* Encrypt/decrypt data */
if (type == TYPE_ENCRYPT) {
res = EVP_EncryptUpdate(ctx, outbuf, &out_len, data, data_len);
res = EVP_EncryptUpdate(ctx, outbuf, out_len, data, data_len);
} else {
res = EVP_DecryptUpdate(ctx, outbuf, &out_len, data, data_len);
res = EVP_DecryptUpdate(ctx, outbuf, out_len, data, data_len);
}
if (!res) {
if (res) {
*out_len += len;
return TCL_OK;
} else {
Tcl_AppendResult(interp, "Update failed: ", REASON(), NULL);
Tcl_DecrRefCount(resultObj);
EVP_CIPHER_CTX_free(ctx);
res = EVP_EncryptFinal_ex(ctx, outbuf+out_len, &tmplen);
res = EVP_EncryptFinal_ex(ctx, outbuf, out_len);
} else {
res = EVP_DecryptFinal_ex(ctx, outbuf+out_len, &tmplen);
res = EVP_DecryptFinal_ex(ctx, outbuf, out_len);
}
if (!res) {
if (res) {
*out_len += len;
return TCL_OK;
} else {
Tcl_AppendResult(interp, "Finalize failed: ", REASON(), NULL);
return TCL_ERROR;
}
}
Tcl_DecrRefCount(resultObj);
EVP_CIPHER_CTX_free(ctx);
out_len += tmplen;
outbuf = Tcl_SetByteArrayLength(resultObj, out_len);
resultObj = Tcl_NewObj();
outbuf = Tcl_SetByteArrayLength(resultObj, data_len+1024);
if (resultObj == NULL || outbuf == NULL) {
Tcl_AppendResult(interp, "Memory allocation error", (char *) NULL);
return TCL_ERROR;
}
/* Perform operation */
if (EncryptInitialize(interp, type, &ctx, cipherObj, keyObj, ivObj) != TCL_OK ||
EncryptUpdate(interp, type, ctx, outbuf, &out_len, data, data_len) != TCL_OK ||
EncryptFinalize(interp, type, ctx, outbuf+out_len, &out_len) != TCL_OK) {
res = TCL_ERROR;
goto done;
}
done:
/* Set return result */
Tcl_SetObjResult(interp, resultObj);
/* Set output result */
if (res == TCL_OK) {
outbuf = Tcl_SetByteArrayLength(resultObj, out_len);
Tcl_SetObjResult(interp, resultObj);
} else {
Tcl_DecrRefCount(resultObj);
/* Result is error message */
}
/* Clean up */
if (ctx != NULL) {
EVP_CIPHER_CTX_free(ctx);
return TCL_OK;
* EncryptionMain --
* EncryptMain --
*
* Perform encryption function and return result.
*
* Returns:
* TCL_OK or TCL_ERROR
*
* Side effects:
* Sets result or error message
*
*-------------------------------------------------------------------
*/
static int EncryptionMain(int type, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
static int EncryptMain(int type, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
int res = TCL_OK;
Tcl_Obj *cipherObj = NULL, *cmdObj = NULL, *dataObj = NULL, *digestObj = NULL;
Tcl_Obj *inFileObj = NULL, *outFileObj = NULL, *keyObj = NULL, *ivObj = NULL;
Tcl_Obj *inFileObj = NULL, *outFileObj = NULL, *keyObj = NULL, *ivObj = NULL, *macObj = NULL;
const char *channel = NULL, *opt;
const EVP_MD *md = NULL;
const EVP_CIPHER *cipher = NULL;
dprintf("Called");
/* Clear interp result */
Tcl_ResetResult(interp);
/* Validate arg count */
if (objc < 3 || objc > 12) {
Tcl_WrongNumArgs(interp, 1, objv, "?-cipher name? ?-digest name? ?-key key? ?-iv string? [-data data]");
Tcl_WrongNumArgs(interp, 1, objv, "-cipher name ?-digest name? ?-key key? ?-iv string? [-data data]");
return TCL_ERROR;
}
/* Get options */
for (int idx = 1; idx < objc; idx++) {
opt = Tcl_GetStringFromObj(objv[idx], NULL);
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*
* Side effects:
* Command dependent
*
*-------------------------------------------------------------------
*/
static int EncryptObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
return EncryptionMain(TYPE_ENCRYPT, interp, objc, objv);
return EncryptMain(TYPE_ENCRYPT, interp, objc, objv);
}
static int DecryptObjCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]) {
return EncryptionMain(TYPE_DECRYPT, interp, objc, objv);
return EncryptMain(TYPE_DECRYPT, interp, objc, objv);
}
/*
*-------------------------------------------------------------------
*
* Encrypt_Initialize --
*
* Create namespace, commands, and register package version
*
* Returns:
* TCL_OK or TCL_ERROR
*
* Side effects:
* Creates commands
*
*-------------------------------------------------------------------
*/
int Tls_EncryptCommands(Tcl_Interp *interp) {
Tcl_CreateObjCommand(interp, "tls::encrypt", EncryptObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
Tcl_CreateObjCommand(interp, "tls::decrypt", DecryptObjCmd, (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
return TCL_OK;
}
|