diff options
Diffstat (limited to 'security/nss/lib/softoken/alghmac.c')
| -rw-r--r-- | security/nss/lib/softoken/alghmac.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/security/nss/lib/softoken/alghmac.c b/security/nss/lib/softoken/alghmac.c new file mode 100644 index 000000000..fb22fbd9c --- /dev/null +++ b/security/nss/lib/softoken/alghmac.c @@ -0,0 +1,163 @@ +/* + * The contents of this file are subject to the Mozilla Public + * License Version 1.1 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS + * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or + * implied. See the License for the specific language governing + * rights and limitations under the License. + * + * The Original Code is the Netscape security libraries. + * + * The Initial Developer of the Original Code is Netscape + * Communications Corporation. Portions created by Netscape are + * Copyright (C) 1994-2000 Netscape Communications Corporation. All + * Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the + * terms of the GNU General Public License Version 2 or later (the + * "GPL"), in which case the provisions of the GPL are applicable + * instead of those above. If you wish to allow use of your + * version of this file only under the terms of the GPL and not to + * allow others to use your version of this file under the MPL, + * indicate your decision by deleting the provisions above and + * replace them with the notice and other provisions required by + * the GPL. If you do not delete the provisions above, a recipient + * may use your version of this file under either the MPL or the + * GPL. + */ + +#include "sechash.h" +#include "secport.h" +#include "alghmac.h" +#include "secerr.h" + +#define HMAC_PAD_SIZE 64 + +struct HMACContextStr { + void *hash; + const SECHashObject *hashobj; + unsigned char ipad[HMAC_PAD_SIZE]; + unsigned char opad[HMAC_PAD_SIZE]; +}; + +void +HMAC_Destroy(HMACContext *cx) +{ + if (cx == NULL) + return; + + if (cx->hash != NULL) + cx->hashobj->destroy(cx->hash, PR_TRUE); + PORT_ZFree(cx, sizeof(HMACContext)); +} + +HMACContext * +HMAC_Create(const SECHashObject *hash_obj, const unsigned char *secret, + unsigned int secret_len, PRBool isFIPS) +{ + HMACContext *cx; + 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 NULL; + } + cx = (HMACContext*)PORT_ZAlloc(sizeof(HMACContext)); + if (cx == NULL) + return NULL; + cx->hashobj = hash_obj; + + cx->hash = cx->hashobj->create(); + if (cx->hash == NULL) + goto loser; + + if (secret_len > HMAC_PAD_SIZE) { + 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) + goto loser; + secret = (const unsigned char *)&hashed_secret[0]; + } + + PORT_Memset(cx->ipad, 0x36, sizeof cx->ipad); + PORT_Memset(cx->opad, 0x5c, sizeof cx->opad); + + /* 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 cx; + +loser: + PORT_Memset(hashed_secret, 0, sizeof hashed_secret); + HMAC_Destroy(cx); + return NULL; +} + +void +HMAC_Begin(HMACContext *cx) +{ + /* start inner hash */ + cx->hashobj->begin(cx->hash); + cx->hashobj->update(cx->hash, cx->ipad, sizeof(cx->ipad)); +} + +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, sizeof(cx->opad)); + 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->hashobj = cx->hashobj; + newcx->hash = cx->hashobj->clone(cx->hash); + if (newcx->hash == NULL) + goto loser; + PORT_Memcpy(newcx->ipad, cx->ipad, sizeof(cx->ipad)); + PORT_Memcpy(newcx->opad, cx->opad, sizeof(cx->opad)); + return newcx; + +loser: + HMAC_Destroy(newcx); + return NULL; +} |