import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/freebl/alghmac.c

@@ -0,0 +1,165 @@
+/* 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);
+}
+
+SECStatus
+HMAC_Init(HMACContext *cx, const SECHashObject *hash_obj,
+          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 < hash_obj->length / 2) {
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+        return SECFailure;
+    }
+    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;
+
+    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);
+    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;
+}
+
+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;
+}