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-rw-r--r--security/nss/lib/freebl/alghmac.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/security/nss/lib/freebl/alghmac.c b/security/nss/lib/freebl/alghmac.c
new file mode 100644
index 0000000000..58bbaa9ec8
--- /dev/null
+++ b/security/nss/lib/freebl/alghmac.c
@@ -0,0 +1,209 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef FREEBL_NO_DEPEND
+#include "stubs.h"
+#endif
+
+#include "secport.h"
+#include "hasht.h"
+#include "blapit.h"
+#include "alghmac.h"
+#include "secerr.h"
+
+#define HMAC_PAD_SIZE HASH_BLOCK_LENGTH_MAX
+
+struct HMACContextStr {
+ void *hash;
+ const SECHashObject *hashobj;
+ PRBool wasAllocated;
+ unsigned char ipad[HMAC_PAD_SIZE];
+ unsigned char opad[HMAC_PAD_SIZE];
+};
+
+void
+HMAC_Destroy(HMACContext *cx, PRBool freeit)
+{
+ if (cx == NULL)
+ return;
+
+ PORT_Assert(!freeit == !cx->wasAllocated);
+ if (cx->hash != NULL) {
+ cx->hashobj->destroy(cx->hash, PR_TRUE);
+ PORT_Memset(cx, 0, sizeof *cx);
+ }
+ if (freeit)
+ PORT_Free(cx);
+}
+
+static SECStatus
+hmac_initKey(HMACContext *cx, const unsigned char *secret,
+ unsigned int secret_len, PRBool isFIPS)
+{
+ unsigned int i;
+ unsigned char hashed_secret[HASH_LENGTH_MAX];
+
+ /* required by FIPS 198 Section 3 */
+ if (isFIPS && secret_len < cx->hashobj->length / 2) {
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return SECFailure;
+ }
+
+ if (secret_len > cx->hashobj->blocklength) {
+ cx->hashobj->begin(cx->hash);
+ cx->hashobj->update(cx->hash, secret, secret_len);
+ PORT_Assert(cx->hashobj->length <= sizeof hashed_secret);
+ cx->hashobj->end(cx->hash, hashed_secret, &secret_len,
+ sizeof hashed_secret);
+ if (secret_len != cx->hashobj->length) {
+ PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+ goto loser;
+ }
+ secret = (const unsigned char *)&hashed_secret[0];
+ }
+
+ PORT_Memset(cx->ipad, 0x36, cx->hashobj->blocklength);
+ PORT_Memset(cx->opad, 0x5c, cx->hashobj->blocklength);
+
+ /* fold secret into padding */
+ for (i = 0; i < secret_len; i++) {
+ cx->ipad[i] ^= secret[i];
+ cx->opad[i] ^= secret[i];
+ }
+ PORT_Memset(hashed_secret, 0, sizeof hashed_secret);
+ return SECSuccess;
+
+loser:
+ PORT_Memset(hashed_secret, 0, sizeof hashed_secret);
+ return SECFailure;
+}
+
+SECStatus
+HMAC_Init(HMACContext *cx, const SECHashObject *hash_obj,
+ const unsigned char *secret, unsigned int secret_len, PRBool isFIPS)
+{
+ SECStatus rv;
+
+ if (cx == NULL) {
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return SECFailure;
+ }
+ cx->wasAllocated = PR_FALSE;
+ cx->hashobj = hash_obj;
+ cx->hash = cx->hashobj->create();
+ if (cx->hash == NULL)
+ goto loser;
+
+ rv = hmac_initKey(cx, secret, secret_len, isFIPS);
+ if (rv != SECSuccess)
+ goto loser;
+
+ return rv;
+loser:
+ if (cx->hash != NULL)
+ cx->hashobj->destroy(cx->hash, PR_TRUE);
+ return SECFailure;
+}
+
+HMACContext *
+HMAC_Create(const SECHashObject *hash_obj, const unsigned char *secret,
+ unsigned int secret_len, PRBool isFIPS)
+{
+ SECStatus rv;
+ HMACContext *cx = PORT_ZNew(HMACContext);
+ if (cx == NULL)
+ return NULL;
+ rv = HMAC_Init(cx, hash_obj, secret, secret_len, isFIPS);
+ cx->wasAllocated = PR_TRUE;
+ if (rv != SECSuccess) {
+ PORT_Free(cx); /* contains no secret info */
+ cx = NULL;
+ }
+ return cx;
+}
+
+/* this allows us to reuse an existing HMACContext with a new key and
+ * Hash function */
+SECStatus
+HMAC_ReInit(HMACContext *cx, const SECHashObject *hash_obj,
+ const unsigned char *secret, unsigned int secret_len, PRBool isFIPS)
+{
+ PRBool wasAllocated;
+ SECStatus rv;
+
+ /* if we are using the same hash, keep the hash contexts and only
+ * init the key */
+ if ((cx->hashobj == hash_obj) && (cx->hash != NULL)) {
+ return hmac_initKey(cx, secret, secret_len, isFIPS);
+ }
+ /* otherwise we destroy the contents of the context and
+ * initalize it from scratch. We need to preseve the current state
+ * of wasAllocated to the final destroy works correctly */
+ wasAllocated = cx->wasAllocated;
+ cx->wasAllocated = PR_FALSE;
+ HMAC_Destroy(cx, PR_FALSE);
+ rv = HMAC_Init(cx, hash_obj, secret, secret_len, isFIPS);
+ if (rv != SECSuccess) {
+ return rv;
+ }
+ cx->wasAllocated = wasAllocated;
+ return SECSuccess;
+}
+
+void
+HMAC_Begin(HMACContext *cx)
+{
+ /* start inner hash */
+ cx->hashobj->begin(cx->hash);
+ cx->hashobj->update(cx->hash, cx->ipad, cx->hashobj->blocklength);
+}
+
+void
+HMAC_Update(HMACContext *cx, const unsigned char *data, unsigned int data_len)
+{
+ cx->hashobj->update(cx->hash, data, data_len);
+}
+
+SECStatus
+HMAC_Finish(HMACContext *cx, unsigned char *result, unsigned int *result_len,
+ unsigned int max_result_len)
+{
+ if (max_result_len < cx->hashobj->length) {
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return SECFailure;
+ }
+
+ cx->hashobj->end(cx->hash, result, result_len, max_result_len);
+ if (*result_len != cx->hashobj->length)
+ return SECFailure;
+
+ cx->hashobj->begin(cx->hash);
+ cx->hashobj->update(cx->hash, cx->opad, cx->hashobj->blocklength);
+ cx->hashobj->update(cx->hash, result, *result_len);
+ cx->hashobj->end(cx->hash, result, result_len, max_result_len);
+ return SECSuccess;
+}
+
+HMACContext *
+HMAC_Clone(HMACContext *cx)
+{
+ HMACContext *newcx;
+
+ newcx = (HMACContext *)PORT_ZAlloc(sizeof(HMACContext));
+ if (newcx == NULL)
+ goto loser;
+
+ newcx->wasAllocated = PR_TRUE;
+ newcx->hashobj = cx->hashobj;
+ newcx->hash = cx->hashobj->clone(cx->hash);
+ if (newcx->hash == NULL)
+ goto loser;
+ PORT_Memcpy(newcx->ipad, cx->ipad, cx->hashobj->blocklength);
+ PORT_Memcpy(newcx->opad, cx->opad, cx->hashobj->blocklength);
+ return newcx;
+
+loser:
+ HMAC_Destroy(newcx, PR_TRUE);
+ return NULL;
+}