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mbedtls/library/pkcs5.c

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/**
* \file pkcs5.c
*
* \brief PKCS#5 functions
*
* \author Mathias Olsson <mathias@kompetensum.com>
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* PKCS#5 includes PBKDF2 and more
*
* http://tools.ietf.org/html/rfc2898 (Specification)
* http://tools.ietf.org/html/rfc6070 (Test vectors)
*/
#include "polarssl/config.h"
#if defined(POLARSSL_PKCS5_C)
#include "polarssl/pkcs5.h"
#include "polarssl/asn1.h"
#include "polarssl/cipher.h"
#include "polarssl/oid.h"
static int pkcs5_parse_pbkdf2_params( asn1_buf *params,
asn1_buf *salt, int *iterations,
int *keylen, md_type_t *md_type )
{
int ret;
asn1_buf prf_alg_oid;
unsigned char **p = &params->p;
const unsigned char *end = params->p + params->len;
if( params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
/*
* PBKDF2-params ::= SEQUENCE {
* salt OCTET STRING,
* iterationCount INTEGER,
* keyLength INTEGER OPTIONAL
* prf AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
* }
*
*/
if( ( ret = asn1_get_tag( p, end, &salt->len, ASN1_OCTET_STRING ) ) != 0 )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
salt->p = *p;
*p += salt->len;
if( ( ret = asn1_get_int( p, end, iterations ) ) != 0 )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
if( *p == end )
return( 0 );
if( ( ret = asn1_get_int( p, end, keylen ) ) != 0 )
{
if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
}
if( *p == end )
return( 0 );
if( ( ret = asn1_get_alg_null( p, end, &prf_alg_oid ) ) != 0 )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
if( !OID_CMP( OID_HMAC_SHA1, &prf_alg_oid ) )
return( POLARSSL_ERR_PKCS5_FEATURE_UNAVAILABLE );
*md_type = POLARSSL_MD_SHA1;
if( *p != end )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT +
POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
return( 0 );
}
int pkcs5_pbes2( asn1_buf *pbe_params, int mode,
const unsigned char *pwd, size_t pwdlen,
const unsigned char *data, size_t datalen,
unsigned char *output )
{
int ret, iterations = 0, keylen = 0;
unsigned char *p, *end;
asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params;
asn1_buf salt;
md_type_t md_type = POLARSSL_MD_SHA1;
unsigned char key[32], iv[32];
size_t olen = 0;
const md_info_t *md_info;
const cipher_info_t *cipher_info;
md_context_t md_ctx;
cipher_type_t cipher_alg;
cipher_context_t cipher_ctx;
p = pbe_params->p;
end = p + pbe_params->len;
memset( &md_ctx, 0, sizeof(md_context_t) );
memset( &cipher_ctx, 0, sizeof(cipher_context_t) );
/*
* PBES2-params ::= SEQUENCE {
* keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
* encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
* }
*/
if( pbe_params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT +
POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
if( ( ret = asn1_get_alg( &p, end, &kdf_alg_oid, &kdf_alg_params ) ) != 0 )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
// Only PBKDF2 supported at the moment
//
if( !OID_CMP( OID_PKCS5_PBKDF2, &kdf_alg_oid ) )
return( POLARSSL_ERR_PKCS5_FEATURE_UNAVAILABLE );
if( ( ret = pkcs5_parse_pbkdf2_params( &kdf_alg_params,
&salt, &iterations, &keylen,
&md_type ) ) != 0 )
{
return( ret );
}
md_info = md_info_from_type( md_type );
if( md_info == NULL )
return( POLARSSL_ERR_PKCS5_FEATURE_UNAVAILABLE );
if( ( ret = asn1_get_alg( &p, end, &enc_scheme_oid, &enc_scheme_params ) ) != 0 )
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT + ret );
if ( oid_get_cipher_alg( &enc_scheme_oid, &cipher_alg ) != 0 )
return( POLARSSL_ERR_PKCS5_FEATURE_UNAVAILABLE );
cipher_info = cipher_info_from_type( cipher_alg );
if( cipher_info == NULL )
return( POLARSSL_ERR_PKCS5_FEATURE_UNAVAILABLE );
keylen = cipher_info->key_length / 8;
if( enc_scheme_params.tag != ASN1_OCTET_STRING ||
enc_scheme_params.len != cipher_info->iv_size )
{
return( POLARSSL_ERR_PKCS5_INVALID_FORMAT );
}
memcpy( iv, enc_scheme_params.p, enc_scheme_params.len );
if( ( ret = md_init_ctx( &md_ctx, md_info ) ) != 0 )
goto exit;
if ( ( ret = pkcs5_pbkdf2_hmac( &md_ctx, pwd, pwdlen, salt.p, salt.len,
iterations, keylen, key ) ) != 0 )
{
goto exit;
}
if( ( ret = cipher_init_ctx( &cipher_ctx, cipher_info ) ) != 0 )
goto exit;
if( ( ret = cipher_setkey( &cipher_ctx, key, 8 * keylen, mode ) ) != 0 )
goto exit;
if( ( ret = cipher_set_iv( &cipher_ctx, iv, enc_scheme_params.len ) ) != 0 )
goto exit;
if( ( ret = cipher_reset( &cipher_ctx ) ) != 0 )
goto exit;
if( ( ret = cipher_update( &cipher_ctx, data, datalen,
output, &olen ) ) != 0 )
{
goto exit;
}
if( ( ret = cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
ret = POLARSSL_ERR_PKCS5_PASSWORD_MISMATCH;
exit:
md_free_ctx( &md_ctx );
cipher_free_ctx( &cipher_ctx );
return( ret );
}
int pkcs5_pbkdf2_hmac( md_context_t *ctx, const unsigned char *password,
size_t plen, const unsigned char *salt, size_t slen,
unsigned int iteration_count,
uint32_t key_length, unsigned char *output )
{
int ret, j;
unsigned int i;
unsigned char md1[POLARSSL_MD_MAX_SIZE];
unsigned char work[POLARSSL_MD_MAX_SIZE];
unsigned char md_size = md_get_size( ctx->md_info );
size_t use_len;
unsigned char *out_p = output;
unsigned char counter[4];
memset( counter, 0, 4 );
counter[3] = 1;
if( iteration_count > 0xFFFFFFFF )
return( POLARSSL_ERR_PKCS5_BAD_INPUT_DATA );
while( key_length )
{
// U1 ends up in work
//
if( ( ret = md_hmac_starts( ctx, password, plen ) ) != 0 )
return( ret );
if( ( ret = md_hmac_update( ctx, salt, slen ) ) != 0 )
return( ret );
if( ( ret = md_hmac_update( ctx, counter, 4 ) ) != 0 )
return( ret );
if( ( ret = md_hmac_finish( ctx, work ) ) != 0 )
return( ret );
memcpy( md1, work, md_size );
for ( i = 1; i < iteration_count; i++ )
{
// U2 ends up in md1
//
if( ( ret = md_hmac_starts( ctx, password, plen ) ) != 0 )
return( ret );
if( ( ret = md_hmac_update( ctx, md1, md_size ) ) != 0 )
return( ret );
if( ( ret = md_hmac_finish( ctx, md1 ) ) != 0 )
return( ret );
// U1 xor U2
//
for( j = 0; j < md_size; j++ )
work[j] ^= md1[j];
}
use_len = ( key_length < md_size ) ? key_length : md_size;
memcpy( out_p, work, use_len );
key_length -= (uint32_t) use_len;
out_p += use_len;
for( i = 4; i > 0; i-- )
if( ++counter[i - 1] != 0 )
break;
}
return( 0 );
}
#if defined(POLARSSL_SELF_TEST)
#include <stdio.h>
#define MAX_TESTS 6
size_t plen[MAX_TESTS] =
{ 8, 8, 8, 8, 24, 9 };
unsigned char password[MAX_TESTS][32] =
{
"password",
"password",
"password",
"password",
"passwordPASSWORDpassword",
"pass\0word",
};
size_t slen[MAX_TESTS] =
{ 4, 4, 4, 4, 36, 5 };
unsigned char salt[MAX_TESTS][40] =
{
"salt",
"salt",
"salt",
"salt",
"saltSALTsaltSALTsaltSALTsaltSALTsalt",
"sa\0lt",
};
uint32_t it_cnt[MAX_TESTS] =
{ 1, 2, 4096, 16777216, 4096, 4096 };
uint32_t key_len[MAX_TESTS] =
{ 20, 20, 20, 20, 25, 16 };
unsigned char result_key[MAX_TESTS][32] =
{
{ 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
0x2f, 0xe0, 0x37, 0xa6 },
{ 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
0xd8, 0xde, 0x89, 0x57 },
{ 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
0x65, 0xa4, 0x29, 0xc1 },
{ 0xee, 0xfe, 0x3d, 0x61, 0xcd, 0x4d, 0xa4, 0xe4,
0xe9, 0x94, 0x5b, 0x3d, 0x6b, 0xa2, 0x15, 0x8c,
0x26, 0x34, 0xe9, 0x84 },
{ 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
0x38 },
{ 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
};
int pkcs5_self_test( int verbose )
{
md_context_t sha1_ctx;
const md_info_t *info_sha1;
int ret, i;
unsigned char key[64];
info_sha1 = md_info_from_type( POLARSSL_MD_SHA1 );
if( info_sha1 == NULL )
return( 1 );
if( ( ret = md_init_ctx( &sha1_ctx, info_sha1 ) ) != 0 )
return( 1 );
for( i = 0; i < MAX_TESTS; i++ )
{
printf( " PBKDF2 (SHA1) #%d: ", i );
ret = pkcs5_pbkdf2_hmac( &sha1_ctx, password[i], plen[i], salt[i],
slen[i], it_cnt[i], key_len[i], key );
if( ret != 0 ||
memcmp( result_key[i], key, key_len[i] ) != 0 )
{
if( verbose != 0 )
printf( "failed\n" );
return( 1 );
}
if( verbose != 0 )
printf( "passed\n" );
}
printf( "\n" );
if( ( ret = md_free_ctx( &sha1_ctx ) ) != 0 )
return( 1 );
return( 0 );
}
#endif /* POLARSSL_SELF_TEST */
#endif /* POLARSSL_PKCS5_C */
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