/*

 *  PKCS#12 Personal Information Exchange Syntax

 *

 *  Copyright The Mbed TLS Contributors

 *  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.

 */

/*

 *  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

 */

#include "common.h"

#if defined(MBEDTLS_PKCS12_C)

#include "mbedtls/pkcs12.h"

#include "mbedtls/asn1.h"

#include "mbedtls/cipher.h"

#include "mbedtls/platform_util.h"

#include "mbedtls/error.h"

#include <string.h>

#if defined(MBEDTLS_DES_C)

#include "mbedtls/des.h"

#endif

#include "hash_info.h"

#include "mbedtls/psa_util.h"

#if defined(MBEDTLS_ASN1_PARSE_C)

static int pkcs12_parse_pbe_params(mbedtls_asn1_buf *params,

                                   mbedtls_asn1_buf *salt, int *iterations)

{

    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    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_ERROR_ADD(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_ERROR_ADD(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_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);

    }

    if (*p != end) {

        return MBEDTLS_ERROR_ADD(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 = 0;

    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(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;

    if (pwd == NULL && pwdlen != 0) {

        return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;

    }

    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_platform_zeroize(key, sizeof(key));

    mbedtls_platform_zeroize(iv,  sizeof(iv));

    mbedtls_cipher_free(&cipher_ctx);

    return ret;

}

#endif /* MBEDTLS_ASN1_PARSE_C */

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;

    if (filler != NULL && fill_len != 0) {

        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;

        }

    } else {

        /* If either of the above are not true then clearly there is nothing

         * that this function can do. The function should *not* be called

         * under either of those circumstances, as you could end up with an

         * incorrect output but for safety's sake, leaving the check in as

         * otherwise we could end up with memory corruption.*/

    }

}

static int calculate_hashes(mbedtls_md_type_t md_type, int iterations,

                            unsigned char *diversifier, unsigned char *salt_block,

                            unsigned char *pwd_block, unsigned char *hash_output, int use_salt,

                            int use_password, size_t hlen, size_t v)

{

#if defined(MBEDTLS_MD_C)

    int ret = -1;

    size_t i;

    const mbedtls_md_info_t *md_info;

    mbedtls_md_context_t md_ctx;

    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;

    }

    // 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 (use_salt != 0) {

        if ((ret = mbedtls_md_update(&md_ctx, salt_block, v)) != 0) {

            goto exit;

        }

    }

    if (use_password != 0) {

        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;

        }

    }

exit:

    mbedtls_md_free(&md_ctx);

    return ret;

#else

    psa_hash_operation_t op = PSA_HASH_OPERATION_INIT;

    psa_algorithm_t alg = mbedtls_psa_translate_md(md_type);

    psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;

    psa_status_t status_abort = PSA_ERROR_CORRUPTION_DETECTED;

    size_t i, out_len, out_size = PSA_HASH_LENGTH(alg);

    if (alg == PSA_ALG_NONE) {

        return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;

    }

    if ((status = psa_hash_setup(&op, alg)) != PSA_SUCCESS) {

        goto exit;

    }

    // Calculate hash( diversifier || salt_block || pwd_block )

    if ((status = psa_hash_update(&op, diversifier, v)) != PSA_SUCCESS) {

        goto exit;

    }

    if (use_salt != 0) {

        if ((status = psa_hash_update(&op, salt_block, v)) != PSA_SUCCESS) {

            goto exit;

        }

    }

    if (use_password != 0) {

        if ((status = psa_hash_update(&op, pwd_block, v)) != PSA_SUCCESS) {

            goto exit;

        }

    }

    if ((status = psa_hash_finish(&op, hash_output, out_size, &out_len))

        != PSA_SUCCESS) {

        goto exit;

    }

    // Perform remaining ( iterations - 1 ) recursive hash calculations

    for (i = 1; i < (size_t) iterations; i++) {

        if ((status = psa_hash_compute(alg, hash_output, hlen, hash_output,

                                       out_size, &out_len)) != PSA_SUCCESS) {

            goto exit;

        }

    }

exit:

    status_abort = psa_hash_abort(&op);

    if (status == PSA_SUCCESS) {

        status = status_abort;

    }

    return mbedtls_md_error_from_psa(status);

#endif /* !MBEDTLS_MD_C */

}

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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;

    unsigned int j;

    unsigned char diversifier[128];

    unsigned char salt_block[128], pwd_block[128], hash_block[128] = { 0 };

    unsigned char hash_output[MBEDTLS_HASH_MAX_SIZE];

    unsigned char *p;

    unsigned char c;

    int           use_password = 0;

    int           use_salt = 0;

    size_t hlen, use_len, v, i;

    // 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;

    }

    if (pwd == NULL && pwdlen != 0) {

        return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;

    }

    if (salt == NULL && saltlen != 0) {

        return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;

    }

    use_password = (pwd && pwdlen != 0);

    use_salt = (salt && saltlen != 0);

    hlen = mbedtls_hash_info_get_size(md_type);

    if (hlen <= 32) {

        v = 64;

    } else {

        v = 128;

    }

    memset(diversifier, (unsigned char) id, v);

    if (use_salt != 0) {

        pkcs12_fill_buffer(salt_block, v, salt, saltlen);

    }

    if (use_password != 0) {

        pkcs12_fill_buffer(pwd_block,  v, pwd,  pwdlen);

    }

    p = data;

    while (datalen > 0) {

        if (calculate_hashes(md_type, iterations, diversifier, salt_block,

                             pwd_block, hash_output, use_salt, use_password, hlen,

                             v) != 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;

            }

        }

        if (use_salt != 0) {

            // salt_block += B

            c = 0;

            for (i = v; i > 0; i--) {

                j = salt_block[i - 1] + hash_block[i - 1] + c;

                c = MBEDTLS_BYTE_1(j);

                salt_block[i - 1] = MBEDTLS_BYTE_0(j);

            }

        }

        if (use_password != 0) {

            // pwd_block  += B

            c = 0;

            for (i = v; i > 0; i--) {

                j = pwd_block[i - 1] + hash_block[i - 1] + c;

                c = MBEDTLS_BYTE_1(j);

                pwd_block[i - 1] = MBEDTLS_BYTE_0(j);

            }

        }

    }

    ret = 0;

exit:

    mbedtls_platform_zeroize(salt_block, sizeof(salt_block));

    mbedtls_platform_zeroize(pwd_block, sizeof(pwd_block));

    mbedtls_platform_zeroize(hash_block, sizeof(hash_block));

    mbedtls_platform_zeroize(hash_output, sizeof(hash_output));

    return ret;

}

#endif /* MBEDTLS_PKCS12_C */