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* Side effects:
* No result or error message
*
*-------------------------------------------------------------------
*/
int DigestInitialize(Tcl_Interp *interp, DigestState *statePtr, Tcl_Obj *digestObj,
Tcl_Obj *cipherObj, Tcl_Obj *keyObj, Tcl_Obj *macObj) {
int key_len = 0, type = statePtr->format & 0xFF0;
const char *digestName = NULL, *cipherName = NULL, *macName = NULL;
const EVP_MD *md = NULL;
const EVP_CIPHER *cipher = NULL;
const unsigned char *key = NULL;
dprintf("Called");
/* Create contexts */
switch(type) {
case TYPE_MD:
statePtr->ctx = EVP_MD_CTX_new();
res = (statePtr->ctx != NULL);
break;
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* Side effects:
* No result or error message
*
*-------------------------------------------------------------------
*/
int DigestInitialize(Tcl_Interp *interp, DigestState *statePtr, Tcl_Obj *digestObj,
Tcl_Obj *cipherObj, Tcl_Obj *keyObj, Tcl_Obj *macObj) {
int res = 0, type = statePtr->format & 0xFF0;
const EVP_MD *md = NULL;
const EVP_CIPHER *cipher = NULL;
const void *key = NULL, *iv = NULL, *salt = NULL;
int key_len = 0;
dprintf("Called");
/* Get digest */
md = Util_GetDigest(interp, digestObj, type != TYPE_CMAC);
if (md == NULL && type != TYPE_CMAC) {
return TCL_ERROR;
}
/* Get cipher */
cipher = Util_GetCipher(interp, cipherObj, type == TYPE_CMAC);
if (cipher == NULL && type == TYPE_CMAC) {
return TCL_ERROR;
}
/* Get key */
key = (const void *) Util_GetKey(interp, keyObj, &key_len, "key", 0, type != TYPE_MD);
if (key == NULL && type != TYPE_MD) {
return TCL_ERROR;
}
/* Create contexts */
switch(type) {
case TYPE_MD:
statePtr->ctx = EVP_MD_CTX_new();
res = (statePtr->ctx != NULL);
break;
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}
if (!res) {
Tcl_AppendResult(interp, "Create context failed", NULL);
return TCL_ERROR;
}
/* Get MAC */
if (macObj != NULL) {
macName = Tcl_GetStringFromObj(macObj, NULL);
if (strcmp(macName, "cmac") == 0) {
type = TYPE_CMAC;
} else if (strcmp(macName, "hmac") == 0) {
type = TYPE_HMAC;
} else {
Tcl_AppendResult(interp, "Invalid MAC \"", macName, "\"", NULL);
return TCL_ERROR;
}
} else if (type == TYPE_MAC) {
Tcl_AppendResult(interp, "No MAC specified", NULL);
return TCL_ERROR;
}
/* Get digest */
if (digestObj != NULL) {
digestName = Tcl_GetStringFromObj(digestObj, NULL);
md = EVP_get_digestbyname(digestName);
if (md == NULL) {
Tcl_AppendResult(interp, "Invalid digest \"", digestName, "\"", NULL);
return TCL_ERROR;
} else if (md == EVP_shake128() || md == EVP_shake256()) {
statePtr->format |= IS_XOF;
}
} else if (type != TYPE_CMAC) {
Tcl_AppendResult(interp, "No digest specified", NULL);
return TCL_ERROR;
}
/* Get cipher */
if (cipherObj != NULL) {
cipherName = Tcl_GetStringFromObj(cipherObj, NULL);
cipher = EVP_get_cipherbyname(cipherName);
if (cipher == NULL) {
Tcl_AppendResult(interp, "Invalid cipher \"", cipherName, "\"", NULL);
return TCL_ERROR;
}
} else if (type == TYPE_CMAC) {
Tcl_AppendResult(interp, "No cipher specified", NULL);
return TCL_ERROR;
}
/* Get key */
if (keyObj != NULL) {
key = Tcl_GetByteArrayFromObj(keyObj, &key_len);
} else if (type != TYPE_MD) {
Tcl_AppendResult(interp, "No key specified", NULL);
return TCL_ERROR;
}
res = HMAC_Init_ex(statePtr->hctx, (const void *) key, key_len, md, NULL);
break;
case TYPE_CMAC:
res = CMAC_Init(statePtr->cctx, (const void *) key, key_len, cipher, NULL);
break;
}
if (!res) {
Tcl_AppendResult(interp, "Initialize failed: ", REASON(), NULL);
return TCL_ERROR;
}
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}
if (!res) {
Tcl_AppendResult(interp, "Create context failed", NULL);
return TCL_ERROR;
}
/* Initialize cryptography function */
switch(type) {
case TYPE_MD:
res = EVP_DigestInit_ex(statePtr->ctx, md, NULL);
break;
case TYPE_HMAC:
res = HMAC_Init_ex(statePtr->hctx, key, key_len, md, NULL);
break;
case TYPE_CMAC:
res = CMAC_Init(statePtr->cctx, key, key_len, cipher, NULL);
break;
}
if (!res) {
Tcl_AppendResult(interp, "Initialize failed: ", REASON(), NULL);
return TCL_ERROR;
}
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if (macObj != NULL) {
char *macName = Tcl_GetStringFromObj(macObj, NULL);
if (strcmp(macName,"cmac") == 0) {
type = TYPE_CMAC;
} else if (strcmp(macName,"hmac") == 0) {
type = TYPE_HMAC;
} else {
Tcl_AppendResult(interp, "Invalid MAC \"", macName, "\"", NULL);
return TCL_ERROR;
}
} else {
Tcl_AppendResult(interp, "No MAC specified", NULL);
return TCL_ERROR;
}
}
/* Calc digest on file, stacked channel, using instance command, or data blob */
if (fileObj != NULL) {
res = DigestFileHandler(interp, fileObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (channel != NULL) {
res = DigestChannelHandler(interp, channel, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (cmdObj != NULL) {
res = DigestCommandHandler(interp, cmdObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (dataObj != NULL) {
res = DigestDataHandler(interp, dataObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else {
Tcl_AppendResult(interp, "No operation specified: Use -channel, -command, -data, or -file option", NULL);
res = TCL_ERROR;
}
return res;
}
/*
*-------------------------------------------------------------------
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if (macObj != NULL) {
char *macName = Tcl_GetStringFromObj(macObj, NULL);
if (strcmp(macName,"cmac") == 0) {
type = TYPE_CMAC;
} else if (strcmp(macName,"hmac") == 0) {
type = TYPE_HMAC;
} else {
Tcl_AppendResult(interp, "invalid MAC \"", macName, "\"", NULL);
return TCL_ERROR;
}
} else {
Tcl_AppendResult(interp, "no MAC", NULL);
return TCL_ERROR;
}
}
/* Calc digest on file, stacked channel, using instance command, or data blob */
if (fileObj != NULL) {
res = DigestFileHandler(interp, fileObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (channel != NULL) {
res = DigestChannelHandler(interp, channel, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (cmdObj != NULL) {
res = DigestCommandHandler(interp, cmdObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else if (dataObj != NULL) {
res = DigestDataHandler(interp, dataObj, digestObj, cipherObj, format | type, keyObj, macObj);
} else {
Tcl_AppendResult(interp, "No operation: Use -channel, -command, -data, or -file option", NULL);
res = TCL_ERROR;
}
return res;
}
/*
*-------------------------------------------------------------------
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