diff options
Diffstat (limited to 'src/lib/crypto/nss/pbkdf2.c')
-rw-r--r-- | src/lib/crypto/nss/pbkdf2.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/lib/crypto/nss/pbkdf2.c b/src/lib/crypto/nss/pbkdf2.c new file mode 100644 index 0000000..b1b1e35 --- /dev/null +++ b/src/lib/crypto/nss/pbkdf2.c @@ -0,0 +1,117 @@ +/* + * lib/crypto/nss/pbkdf2.c + * + * Copyright 2002, 2008, 2009 by the Massachusetts Institute of Technology. + * All Rights Reserved. + * + * Export of this software from the United States of America may + * require a specific license from the United States Government. + * It is the responsibility of any person or organization contemplating + * export to obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of M.I.T. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. Furthermore if you modify this software you must label + * your software as modified software and not distribute it in such a + * fashion that it might be confused with the original M.I.T. software. + * M.I.T. makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * + * Implementation of PBKDF2 from RFC 2898. + * Not currently used; likely to be used when we get around to AES support. + */ + +#include <ctype.h> +#include "k5-int.h" +#include "hash_provider.h" +#include "pk11pub.h" +#include "nss_gen.h" + + +krb5_error_code +krb5int_pbkdf2_hmac_sha1 (const krb5_data *out, unsigned long count, + const krb5_data *pass, const krb5_data *salt) +{ + + PK11SlotInfo *slot = NULL; + SECAlgorithmID *algid = NULL; + PK11SymKey *symKey = NULL; + SECItem saltItem, pwItem; + const SECItem *keydata = NULL; + SECOidTag pbeAlg = SEC_OID_PKCS5_PBKDF2; + SECOidTag cipherAlg = SEC_OID_AES_256_CBC; + SECOidTag prfAlg = SEC_OID_HMAC_SHA1; + krb5_error_code ret; + + ret = k5_nss_init(); + if (ret) return ret; + + slot = PK11_GetBestSlot(PK11_AlgtagToMechanism(pbeAlg), NULL); + if (slot == NULL) { + return k5_nss_map_last_error(); + } + + saltItem.type = siBuffer; + saltItem.data = (unsigned char *)salt->data; + saltItem.len = salt->length; + + /* PKCS 5 was designed to be DER encoded. Algid's carry all the + * information needed to describe the encoding the the recipient. + * This usually allows for crypto agility in the protocol automatically. + * Kerberos already had to solve it's crypto agility issues, so the + * algid is just and extra step we need that we will throw away */ + algid = PK11_CreatePBEV2AlgorithmID(pbeAlg, cipherAlg, prfAlg, + out->length, count, &saltItem); + if (algid == NULL) { + ret = k5_nss_map_last_error(); + goto loser; + } + + pwItem.type = siBuffer; + pwItem.data = (unsigned char *)pass->data; + pwItem.len = pass->length; + + symKey = PK11_PBEKeyGen(slot, algid, &pwItem, PR_FALSE, NULL); + if (symKey == NULL) { + ret = k5_nss_map_last_error(); + goto loser; + } + /* at this point we should return symKey as a key, but kerberos is + * still passing bits around instead of key handles */ + PK11_ExtractKeyValue(symKey); + + /* keydata here is a const * and is valid as long as the key has not been + * destroyed. */ + keydata = PK11_GetKeyData(symKey); + if (keydata == NULL) { + ret = k5_nss_map_last_error(); + goto loser; + } + + if (out->length != keydata->len) { + ret = -1; /* XXXXX */ + goto loser; + } + memcpy(out->data, keydata->data, keydata->len); + ret = 0; + +loser: + if (symKey) { + PK11_FreeSymKey(symKey); + } + if (algid) { + SECOID_DestroyAlgorithmID(algid, PR_TRUE); + } + if (slot) { + PK11_FreeSlot(slot); + } + + return ret; +} |