mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-14 03:30:17 +01:00
132 lines
4.2 KiB
C
132 lines
4.2 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* This file implements the Symkey wrapper and the PKCS context
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* Interfaces.
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*/
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#include "seccomon.h"
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#include "secmod.h"
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#include "nssilock.h"
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#include "secmodi.h"
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#include "secmodti.h"
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#include "pkcs11.h"
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#include "pk11func.h"
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#include "secitem.h"
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#include "key.h"
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#include "secasn1.h"
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#include "sechash.h"
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#include "cert.h"
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#include "secerr.h"
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/*
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* find an RSA public key on a card
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*/
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static CK_OBJECT_HANDLE
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pk11_FindRSAPubKey(PK11SlotInfo *slot)
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{
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CK_KEY_TYPE key_type = CKK_RSA;
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CK_OBJECT_CLASS class_type = CKO_PUBLIC_KEY;
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CK_ATTRIBUTE theTemplate[2];
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int template_count = sizeof(theTemplate)/sizeof(theTemplate[0]);
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CK_ATTRIBUTE *attrs = theTemplate;
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PK11_SETATTRS(attrs,CKA_CLASS,&class_type,sizeof(class_type)); attrs++;
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PK11_SETATTRS(attrs,CKA_KEY_TYPE,&key_type,sizeof(key_type)); attrs++;
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template_count = attrs - theTemplate;
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PR_ASSERT(template_count <= sizeof(theTemplate)/sizeof(CK_ATTRIBUTE));
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return pk11_FindObjectByTemplate(slot,theTemplate,template_count);
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}
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PK11SymKey *
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pk11_KeyExchange(PK11SlotInfo *slot,CK_MECHANISM_TYPE type,
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CK_ATTRIBUTE_TYPE operation, CK_FLAGS flags,
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PRBool isPerm, PK11SymKey *symKey)
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{
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PK11SymKey *newSymKey = NULL;
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SECStatus rv;
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/* performance improvement can go here --- use a generated key at startup
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* to generate a per token wrapping key. If it exists, use it, otherwise
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* do a full key exchange. */
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/* find a common Key Exchange algorithm */
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/* RSA */
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if (PK11_DoesMechanism(symKey->slot, CKM_RSA_PKCS) &&
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PK11_DoesMechanism(slot,CKM_RSA_PKCS)) {
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CK_OBJECT_HANDLE pubKeyHandle = CK_INVALID_HANDLE;
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CK_OBJECT_HANDLE privKeyHandle = CK_INVALID_HANDLE;
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SECKEYPublicKey *pubKey = NULL;
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SECKEYPrivateKey *privKey = NULL;
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SECItem wrapData;
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unsigned int symKeyLength = PK11_GetKeyLength(symKey);
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wrapData.data = NULL;
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/* find RSA Public Key on target */
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pubKeyHandle = pk11_FindRSAPubKey(slot);
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if (pubKeyHandle != CK_INVALID_HANDLE) {
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privKeyHandle = PK11_MatchItem(slot,pubKeyHandle,CKO_PRIVATE_KEY);
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}
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/* if no key exists, generate a key pair */
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if (privKeyHandle == CK_INVALID_HANDLE) {
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PK11RSAGenParams rsaParams;
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if (symKeyLength > 53) /* bytes */ {
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/* we'd have to generate an RSA key pair > 512 bits long,
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** and that's too costly. Don't even try.
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*/
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PORT_SetError( SEC_ERROR_CANNOT_MOVE_SENSITIVE_KEY );
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goto rsa_failed;
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}
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rsaParams.keySizeInBits =
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(symKeyLength > 21 || symKeyLength == 0) ? 512 : 256;
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rsaParams.pe = 0x10001;
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privKey = PK11_GenerateKeyPair(slot,CKM_RSA_PKCS_KEY_PAIR_GEN,
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&rsaParams, &pubKey,PR_FALSE,PR_TRUE,symKey->cx);
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} else {
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/* if keys exist, build SECKEY data structures for them */
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privKey = PK11_MakePrivKey(slot,nullKey, PR_TRUE, privKeyHandle,
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symKey->cx);
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if (privKey != NULL) {
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pubKey = PK11_ExtractPublicKey(slot, rsaKey, pubKeyHandle);
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if (pubKey && pubKey->pkcs11Slot) {
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PK11_FreeSlot(pubKey->pkcs11Slot);
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pubKey->pkcs11Slot = NULL;
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pubKey->pkcs11ID = CK_INVALID_HANDLE;
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}
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}
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}
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if (privKey == NULL) goto rsa_failed;
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if (pubKey == NULL) goto rsa_failed;
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wrapData.len = SECKEY_PublicKeyStrength(pubKey);
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if (!wrapData.len) goto rsa_failed;
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wrapData.data = PORT_Alloc(wrapData.len);
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if (wrapData.data == NULL) goto rsa_failed;
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/* now wrap the keys in and out */
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rv = PK11_PubWrapSymKey(CKM_RSA_PKCS, pubKey, symKey, &wrapData);
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if (rv == SECSuccess) {
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newSymKey = PK11_PubUnwrapSymKeyWithFlagsPerm(privKey,
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&wrapData,type,operation,symKeyLength,flags,isPerm);
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/* make sure we wound up where we wanted to be! */
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if (newSymKey && newSymKey->slot != slot) {
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PK11_FreeSymKey(newSymKey);
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newSymKey = NULL;
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}
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}
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rsa_failed:
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if (wrapData.data != NULL) PORT_Free(wrapData.data);
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if (privKey != NULL) SECKEY_DestroyPrivateKey(privKey);
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if (pubKey != NULL) SECKEY_DestroyPublicKey(pubKey);
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return newSymKey;
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}
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PORT_SetError( SEC_ERROR_NO_MODULE );
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return NULL;
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}
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