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MasterPassword/core/c/mpw-algorithm_v2.c

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//==============================================================================
// This file is part of Master Password.
// Copyright (c) 2011-2017, Maarten Billemont.
//
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// Master Password is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
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// Master Password is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
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// You can find a copy of the GNU General Public License in the
// LICENSE file. Alternatively, see <http://www.gnu.org/licenses/>.
//==============================================================================
#include <string.h>
#include <errno.h>
#include <time.h>
#include "mpw-util.h"
#define MP_N 32768LU
#define MP_r 8U
#define MP_p 2U
#define MP_otp_window 5 * 60 /* s */
// Inherited functions.
MPMasterKey mpw_masterKey_v1(
const char *fullName, const char *masterPassword);
const char *mpw_sitePasswordFromTemplate_v1(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *resultParam);
const char *mpw_sitePasswordFromCrypt_v1(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *cipherText);
const char *mpw_sitePasswordFromDerive_v1(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *resultParam);
const char *mpw_siteState_v1(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *state);
// Algorithm version overrides.
static MPMasterKey mpw_masterKey_v2(
const char *fullName, const char *masterPassword) {
return mpw_masterKey_v1( fullName, masterPassword );
}
static MPSiteKey mpw_siteKey_v2(
MPMasterKey masterKey, const char *siteName, MPCounterValue siteCounter,
MPKeyPurpose keyPurpose, const char *keyContext) {
const char *keyScope = mpw_scopeForPurpose( keyPurpose );
trc( "keyScope: %s\n", keyScope );
// OTP counter value.
if (siteCounter == MPCounterValueTOTP)
siteCounter = ((uint32_t)time( NULL ) / MP_otp_window) * MP_otp_window;
// Calculate the site seed.
trc( "siteSalt: keyScope=%s | #siteName=%s | siteName=%s | siteCounter=%s | #keyContext=%s | keyContext=%s\n",
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keyScope, mpw_hex_l( (uint32_t)strlen( siteName ) ), siteName, mpw_hex_l( siteCounter ),
keyContext? mpw_hex_l( (uint32_t)strlen( keyContext ) ): NULL, keyContext );
size_t siteSaltSize = 0;
uint8_t *siteSalt = NULL;
mpw_push_string( &siteSalt, &siteSaltSize, keyScope );
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mpw_push_int( &siteSalt, &siteSaltSize, (uint32_t)strlen( siteName ) );
mpw_push_string( &siteSalt, &siteSaltSize, siteName );
mpw_push_int( &siteSalt, &siteSaltSize, siteCounter );
if (keyContext) {
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mpw_push_int( &siteSalt, &siteSaltSize, (uint32_t)strlen( keyContext ) );
mpw_push_string( &siteSalt, &siteSaltSize, keyContext );
}
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if (!siteSalt) {
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err( "Could not allocate site salt: %s\n", strerror( errno ) );
return NULL;
}
trc( " => siteSalt.id: %s\n", mpw_id_buf( siteSalt, siteSaltSize ) );
trc( "siteKey: hmac-sha256( masterKey.id=%s, siteSalt )\n",
mpw_id_buf( masterKey, MPMasterKeySize ) );
MPSiteKey siteKey = mpw_hash_hmac_sha256( masterKey, MPMasterKeySize, siteSalt, siteSaltSize );
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mpw_free( &siteSalt, siteSaltSize );
if (!siteKey) {
err( "Could not derive site key: %s\n", strerror( errno ) );
return NULL;
}
trc( " => siteKey.id: %s\n", mpw_id_buf( siteKey, MPSiteKeySize ) );
return siteKey;
}
static const char *mpw_sitePasswordFromTemplate_v2(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *resultParam) {
return mpw_sitePasswordFromTemplate_v1( masterKey, siteKey, resultType, resultParam );
}
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static const char *mpw_sitePasswordFromCrypt_v2(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *cipherText) {
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return mpw_sitePasswordFromCrypt_v1( masterKey, siteKey, resultType, cipherText );
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}
static const char *mpw_sitePasswordFromDerive_v2(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *resultParam) {
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return mpw_sitePasswordFromDerive_v1( masterKey, siteKey, resultType, resultParam );
}
static const char *mpw_siteState_v2(
MPMasterKey masterKey, MPSiteKey siteKey, MPResultType resultType, const char *state) {
return mpw_siteState_v1( masterKey, siteKey, resultType, state );
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}