Diff: source/pkcs12.c

Revision:

1:24750b9ad5ef

diff -r 000000000000 -r 24750b9ad5ef source/pkcs12.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/pkcs12.c	Fri Jan 22 16:44:49 2016 -0600
@@ -0,0 +1,365 @@
+/*
+ *  PKCS#12 Personal Information Exchange Syntax
+ *
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+/*
+ *  The PKCS #12 Personal Information Exchange Syntax Standard v1.1
+ *
+ *  http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
+ *  ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PKCS12_C)
+
+#include "mbedtls/pkcs12.h"
+#include "mbedtls/asn1.h"
+#include "mbedtls/cipher.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_ARC4_C)
+#include "mbedtls/arc4.h"
+#endif
+
+#if defined(MBEDTLS_DES_C)
+#include "mbedtls/des.h"
+#endif
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+static int pkcs12_parse_pbe_params( mbedtls_asn1_buf *params,
+                                    mbedtls_asn1_buf *salt, int *iterations )
+{
+    int ret;
+    unsigned char **p = &params->p;
+    const unsigned char *end = params->p + params->len;
+
+    /*
+     *  pkcs-12PbeParams ::= SEQUENCE {
+     *    salt          OCTET STRING,
+     *    iterations    INTEGER
+     *  }
+     *
+     */
+    if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
+        return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
+                MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
+
+    if( ( ret = mbedtls_asn1_get_tag( p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
+        return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
+
+    salt->p = *p;
+    *p += salt->len;
+
+    if( ( ret = mbedtls_asn1_get_int( p, end, iterations ) ) != 0 )
+        return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT + ret );
+
+    if( *p != end )
+        return( MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT +
+                MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
+
+    return( 0 );
+}
+
+#define PKCS12_MAX_PWDLEN 128
+
+static int pkcs12_pbe_derive_key_iv( mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
+                                     const unsigned char *pwd,  size_t pwdlen,
+                                     unsigned char *key, size_t keylen,
+                                     unsigned char *iv,  size_t ivlen )
+{
+    int ret, iterations;
+    mbedtls_asn1_buf salt;
+    size_t i;
+    unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
+
+    if( pwdlen > PKCS12_MAX_PWDLEN )
+        return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
+
+    memset( &salt, 0, sizeof(mbedtls_asn1_buf) );
+    memset( &unipwd, 0, sizeof(unipwd) );
+
+    if( ( ret = pkcs12_parse_pbe_params( pbe_params, &salt,
+                                         &iterations ) ) != 0 )
+        return( ret );
+
+    for( i = 0; i < pwdlen; i++ )
+        unipwd[i * 2 + 1] = pwd[i];
+
+    if( ( ret = mbedtls_pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
+                                   salt.p, salt.len, md_type,
+                                   MBEDTLS_PKCS12_DERIVE_KEY, iterations ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    if( iv == NULL || ivlen == 0 )
+        return( 0 );
+
+    if( ( ret = mbedtls_pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
+                                   salt.p, salt.len, md_type,
+                                   MBEDTLS_PKCS12_DERIVE_IV, iterations ) ) != 0 )
+    {
+        return( ret );
+    }
+    return( 0 );
+}
+
+#undef PKCS12_MAX_PWDLEN
+
+int mbedtls_pkcs12_pbe_sha1_rc4_128( mbedtls_asn1_buf *pbe_params, int mode,
+                             const unsigned char *pwd,  size_t pwdlen,
+                             const unsigned char *data, size_t len,
+                             unsigned char *output )
+{
+#if !defined(MBEDTLS_ARC4_C)
+    ((void) pbe_params);
+    ((void) mode);
+    ((void) pwd);
+    ((void) pwdlen);
+    ((void) data);
+    ((void) len);
+    ((void) output);
+    return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
+#else
+    int ret;
+    unsigned char key[16];
+    mbedtls_arc4_context ctx;
+    ((void) mode);
+
+    mbedtls_arc4_init( &ctx );
+
+    if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, MBEDTLS_MD_SHA1,
+                                          pwd, pwdlen,
+                                          key, 16, NULL, 0 ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    mbedtls_arc4_setup( &ctx, key, 16 );
+    if( ( ret = mbedtls_arc4_crypt( &ctx, len, data, output ) ) != 0 )
+        goto exit;
+
+exit:
+    mbedtls_zeroize( key, sizeof( key ) );
+    mbedtls_arc4_free( &ctx );
+
+    return( ret );
+#endif /* MBEDTLS_ARC4_C */
+}
+
+int mbedtls_pkcs12_pbe( mbedtls_asn1_buf *pbe_params, int mode,
+                mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
+                const unsigned char *pwd,  size_t pwdlen,
+                const unsigned char *data, size_t len,
+                unsigned char *output )
+{
+    int ret, keylen = 0;
+    unsigned char key[32];
+    unsigned char iv[16];
+    const mbedtls_cipher_info_t *cipher_info;
+    mbedtls_cipher_context_t cipher_ctx;
+    size_t olen = 0;
+
+    cipher_info = mbedtls_cipher_info_from_type( cipher_type );
+    if( cipher_info == NULL )
+        return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
+
+    keylen = cipher_info->key_bitlen / 8;
+
+    if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
+                                          key, keylen,
+                                          iv, cipher_info->iv_size ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    mbedtls_cipher_init( &cipher_ctx );
+
+    if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info ) ) != 0 )
+        goto exit;
+
+    if( ( ret = mbedtls_cipher_setkey( &cipher_ctx, key, 8 * keylen, (mbedtls_operation_t) mode ) ) != 0 )
+        goto exit;
+
+    if( ( ret = mbedtls_cipher_set_iv( &cipher_ctx, iv, cipher_info->iv_size ) ) != 0 )
+        goto exit;
+
+    if( ( ret = mbedtls_cipher_reset( &cipher_ctx ) ) != 0 )
+        goto exit;
+
+    if( ( ret = mbedtls_cipher_update( &cipher_ctx, data, len,
+                                output, &olen ) ) != 0 )
+    {
+        goto exit;
+    }
+
+    if( ( ret = mbedtls_cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
+        ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
+
+exit:
+    mbedtls_zeroize( key, sizeof( key ) );
+    mbedtls_zeroize( iv,  sizeof( iv  ) );
+    mbedtls_cipher_free( &cipher_ctx );
+
+    return( ret );
+}
+
+static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
+                                const unsigned char *filler, size_t fill_len )
+{
+    unsigned char *p = data;
+    size_t use_len;
+
+    while( data_len > 0 )
+    {
+        use_len = ( data_len > fill_len ) ? fill_len : data_len;
+        memcpy( p, filler, use_len );
+        p += use_len;
+        data_len -= use_len;
+    }
+}
+
+int mbedtls_pkcs12_derivation( unsigned char *data, size_t datalen,
+                       const unsigned char *pwd, size_t pwdlen,
+                       const unsigned char *salt, size_t saltlen,
+                       mbedtls_md_type_t md_type, int id, int iterations )
+{
+    int ret;
+    unsigned int j;
+
+    unsigned char diversifier[128];
+    unsigned char salt_block[128], pwd_block[128], hash_block[128];
+    unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
+    unsigned char *p;
+    unsigned char c;
+
+    size_t hlen, use_len, v, i;
+
+    const mbedtls_md_info_t *md_info;
+    mbedtls_md_context_t md_ctx;
+
+    // This version only allows max of 64 bytes of password or salt
+    if( datalen > 128 || pwdlen > 64 || saltlen > 64 )
+        return( MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA );
+
+    md_info = mbedtls_md_info_from_type( md_type );
+    if( md_info == NULL )
+        return( MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE );
+
+    mbedtls_md_init( &md_ctx );
+
+    if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
+        return( ret );
+    hlen = mbedtls_md_get_size( md_info );
+
+    if( hlen <= 32 )
+        v = 64;
+    else
+        v = 128;
+
+    memset( diversifier, (unsigned char) id, v );
+
+    pkcs12_fill_buffer( salt_block, v, salt, saltlen );
+    pkcs12_fill_buffer( pwd_block,  v, pwd,  pwdlen  );
+
+    p = data;
+    while( datalen > 0 )
+    {
+        // Calculate hash( diversifier || salt_block || pwd_block )
+        if( ( ret = mbedtls_md_starts( &md_ctx ) ) != 0 )
+            goto exit;
+
+        if( ( ret = mbedtls_md_update( &md_ctx, diversifier, v ) ) != 0 )
+            goto exit;
+
+        if( ( ret = mbedtls_md_update( &md_ctx, salt_block, v ) ) != 0 )
+            goto exit;
+
+        if( ( ret = mbedtls_md_update( &md_ctx, pwd_block, v ) ) != 0 )
+            goto exit;
+
+        if( ( ret = mbedtls_md_finish( &md_ctx, hash_output ) ) != 0 )
+            goto exit;
+
+        // Perform remaining ( iterations - 1 ) recursive hash calculations
+        for( i = 1; i < (size_t) iterations; i++ )
+        {
+            if( ( ret = mbedtls_md( md_info, hash_output, hlen, hash_output ) ) != 0 )
+                goto exit;
+        }
+
+        use_len = ( datalen > hlen ) ? hlen : datalen;
+        memcpy( p, hash_output, use_len );
+        datalen -= use_len;
+        p += use_len;
+
+        if( datalen == 0 )
+            break;
+
+        // Concatenating copies of hash_output into hash_block (B)
+        pkcs12_fill_buffer( hash_block, v, hash_output, hlen );
+
+        // B += 1
+        for( i = v; i > 0; i-- )
+            if( ++hash_block[i - 1] != 0 )
+                break;
+
+        // salt_block += B
+        c = 0;
+        for( i = v; i > 0; i-- )
+        {
+            j = salt_block[i - 1] + hash_block[i - 1] + c;
+            c = (unsigned char) (j >> 8);
+            salt_block[i - 1] = j & 0xFF;
+        }
+
+        // pwd_block  += B
+        c = 0;
+        for( i = v; i > 0; i-- )
+        {
+            j = pwd_block[i - 1] + hash_block[i - 1] + c;
+            c = (unsigned char) (j >> 8);
+            pwd_block[i - 1] = j & 0xFF;
+        }
+    }
+
+    ret = 0;
+
+exit:
+    mbedtls_zeroize( salt_block, sizeof( salt_block ) );
+    mbedtls_zeroize( pwd_block, sizeof( pwd_block ) );
+    mbedtls_zeroize( hash_block, sizeof( hash_block ) );
+    mbedtls_zeroize( hash_output, sizeof( hash_output ) );
+
+    mbedtls_md_free( &md_ctx );
+
+    return( ret );
+}
+
+#endif /* MBEDTLS_PKCS12_C */