/work/mbedtls-2.28.8/library/pkcs12.c

Source
/*
 *  PKCS#12 Personal Information Exchange Syntax
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
/*
 *  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_ARC4_C)
#include "mbedtls/arc4.h"
#endif

#if defined(MBEDTLS_DES_C)
#include "mbedtls/des.h"
#endif

#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_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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
    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_platform_zeroize(key, sizeof(key));
    mbedtls_arc4_free(&ctx);

    return ret;
#endif /* MBEDTLS_ARC4_C */
}

#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
int mbedtls_pkcs12_pbe_ext(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, size_t output_size,
                           size_t *output_len);
#endif

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)
{
    size_t output_len = 0;

    /* We assume caller of the function is providing a big enough output buffer
     * so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
     * for the output size actually being correct.
     */
    return mbedtls_pkcs12_pbe_ext(pbe_params, mode, cipher_type, md_type,
                                  pwd, pwdlen, data, len, output, SIZE_MAX,
                                  &output_len);
}

int mbedtls_pkcs12_pbe_ext(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, size_t output_size,
                           size_t *output_len)
{
    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 finish_olen = 0;
    unsigned int padlen = 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 (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
        if (output_size < len) {
            return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
        }
    }

    if (mode == MBEDTLS_PKCS12_PBE_ENCRYPT) {
        padlen = cipher_info->block_size - (len % cipher_info->block_size);
        if (output_size < (len + padlen)) {
            return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
        }
    }

    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 defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
    {
        /* PKCS12 uses CBC with PKCS7 padding */
        mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
        /* For historical reasons, when decrypting, this function works when
         * decrypting even when support for PKCS7 padding is disabled. In this
         * case, it ignores the padding, and so will never report a
         * password mismatch.
         */
        if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
            padding = MBEDTLS_PADDING_NONE;
        }
#endif
        if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
            goto exit;
        }
    }
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */

    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, output_len)) != 0) {
        goto exit;
    }

    if ((ret = mbedtls_cipher_finish(&cipher_ctx, output + (*output_len), &finish_olen)) != 0) {
        ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
    }

    *output_len += finish_olen;

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.*/
    }
}

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];
    unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
    unsigned char *p;
    unsigned char c;
    int           use_password = 0;
    int           use_salt = 0;

    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;
    }

    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);

    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);

    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) {
        // 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;
            }
        }

        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));

    mbedtls_md_free(&md_ctx);

    return ret;
}

#endif /* MBEDTLS_PKCS12_C */

Coverage Report

Created: 2025-10-28 06:49

Line	Count	Source
1		/*
2		* PKCS#12 Personal Information Exchange Syntax
3		*
4		* Copyright The Mbed TLS Contributors
5		* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6		*/
7		/*
8		* The PKCS #12 Personal Information Exchange Syntax Standard v1.1
9		*
10		* http://www.rsa.com/rsalabs/pkcs/files/h11301-wp-pkcs-12v1-1-personal-information-exchange-syntax.pdf
11		* ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-12/pkcs-12v1-1.asn
12		*/
13
14		#include "common.h"
15
16		#if defined(MBEDTLS_PKCS12_C)
17
18		#include "mbedtls/pkcs12.h"
19		#include "mbedtls/asn1.h"
20		#include "mbedtls/cipher.h"
21		#include "mbedtls/platform_util.h"
22		#include "mbedtls/error.h"
23
24		#include <string.h>
25
26		#if defined(MBEDTLS_ARC4_C)
27		#include "mbedtls/arc4.h"
28		#endif
29
30		#if defined(MBEDTLS_DES_C)
31		#include "mbedtls/des.h"
32		#endif
33
34		#if defined(MBEDTLS_ASN1_PARSE_C)
35
36		static int pkcs12_parse_pbe_params(mbedtls_asn1_buf *params,
37		mbedtls_asn1_buf salt, int iterations)
38	0	{
39	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
40	0	unsigned char **p = &params->p;
41	0	const unsigned char *end = params->p + params->len;
42
43		/*
44		* pkcs-12PbeParams ::= SEQUENCE {
45		* salt OCTET STRING,
46		* iterations INTEGER
47		* }
48		*
49		*/
50	0	if (params->tag != (MBEDTLS_ASN1_CONSTRUCTED \| MBEDTLS_ASN1_SEQUENCE)) {
51	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
52	0	MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
53	0	}
54
55	0	if ((ret = mbedtls_asn1_get_tag(p, end, &salt->len, MBEDTLS_ASN1_OCTET_STRING)) != 0) {
56	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
57	0	}
58
59	0	salt->p = *p;
60	0	*p += salt->len;
61
62	0	if ((ret = mbedtls_asn1_get_int(p, end, iterations)) != 0) {
63	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT, ret);
64	0	}
65
66	0	if (*p != end) {
67	0	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS12_PBE_INVALID_FORMAT,
68	0	MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
69	0	}
70
71	0	return 0;
72	0	}
73
74	0	#define PKCS12_MAX_PWDLEN 128
75
76		static int pkcs12_pbe_derive_key_iv(mbedtls_asn1_buf *pbe_params, mbedtls_md_type_t md_type,
77		const unsigned char *pwd, size_t pwdlen,
78		unsigned char *key, size_t keylen,
79		unsigned char *iv, size_t ivlen)
80	0	{
81	0	int ret, iterations = 0;
82	0	mbedtls_asn1_buf salt;
83	0	size_t i;
84	0	unsigned char unipwd[PKCS12_MAX_PWDLEN * 2 + 2];
85
86	0	if (pwdlen > PKCS12_MAX_PWDLEN) {
87	0	return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
88	0	}
89
90	0	memset(&salt, 0, sizeof(mbedtls_asn1_buf));
91	0	memset(&unipwd, 0, sizeof(unipwd));
92
93	0	if ((ret = pkcs12_parse_pbe_params(pbe_params, &salt,
94	0	&iterations)) != 0) {
95	0	return ret;
96	0	}
97
98	0	for (i = 0; i < pwdlen; i++) {
99	0	unipwd[i * 2 + 1] = pwd[i];
100	0	}
101
102	0	if ((ret = mbedtls_pkcs12_derivation(key, keylen, unipwd, pwdlen * 2 + 2,
103	0	salt.p, salt.len, md_type,
104	0	MBEDTLS_PKCS12_DERIVE_KEY, iterations)) != 0) {
105	0	return ret;
106	0	}
107
108	0	if (iv == NULL \|\| ivlen == 0) {
109	0	return 0;
110	0	}
111
112	0	if ((ret = mbedtls_pkcs12_derivation(iv, ivlen, unipwd, pwdlen * 2 + 2,
113	0	salt.p, salt.len, md_type,
114	0	MBEDTLS_PKCS12_DERIVE_IV, iterations)) != 0) {
115	0	return ret;
116	0	}
117	0	return 0;
118	0	}
119
120		#undef PKCS12_MAX_PWDLEN
121
122		int mbedtls_pkcs12_pbe_sha1_rc4_128(mbedtls_asn1_buf *pbe_params, int mode,
123		const unsigned char *pwd, size_t pwdlen,
124		const unsigned char *data, size_t len,
125		unsigned char *output)
126	0	{
127		#if !defined(MBEDTLS_ARC4_C)
128		((void) pbe_params);
129		((void) mode);
130		((void) pwd);
131		((void) pwdlen);
132		((void) data);
133		((void) len);
134		((void) output);
135		return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
136		#else
137	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
138	0	unsigned char key[16];
139	0	mbedtls_arc4_context ctx;
140	0	((void) mode);
141
142	0	mbedtls_arc4_init(&ctx);
143
144	0	if ((ret = pkcs12_pbe_derive_key_iv(pbe_params, MBEDTLS_MD_SHA1,
145	0	pwd, pwdlen,
146	0	key, 16, NULL, 0)) != 0) {
147	0	return ret;
148	0	}
149
150	0	mbedtls_arc4_setup(&ctx, key, 16);
151	0	if ((ret = mbedtls_arc4_crypt(&ctx, len, data, output)) != 0) {
152	0	goto exit;
153	0	}
154
155	0	exit:
156	0	mbedtls_platform_zeroize(key, sizeof(key));
157	0	mbedtls_arc4_free(&ctx);
158
159	0	return ret;
160	0	#endif /* MBEDTLS_ARC4_C */
161	0	}
162
163		#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
164		int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
165		mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
166		const unsigned char *pwd, size_t pwdlen,
167		const unsigned char *data, size_t len,
168		unsigned char *output, size_t output_size,
169		size_t *output_len);
170		#endif
171
172		int mbedtls_pkcs12_pbe(mbedtls_asn1_buf *pbe_params, int mode,
173		mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
174		const unsigned char *pwd, size_t pwdlen,
175		const unsigned char *data, size_t len,
176		unsigned char *output)
177	0	{
178	0	size_t output_len = 0;
179
180		/* We assume caller of the function is providing a big enough output buffer
181		* so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
182		* for the output size actually being correct.
183		*/
184	0	return mbedtls_pkcs12_pbe_ext(pbe_params, mode, cipher_type, md_type,
185	0	pwd, pwdlen, data, len, output, SIZE_MAX,
186	0	&output_len);
187	0	}
188
189		int mbedtls_pkcs12_pbe_ext(mbedtls_asn1_buf *pbe_params, int mode,
190		mbedtls_cipher_type_t cipher_type, mbedtls_md_type_t md_type,
191		const unsigned char *pwd, size_t pwdlen,
192		const unsigned char *data, size_t len,
193		unsigned char *output, size_t output_size,
194		size_t *output_len)
195	0	{
196	0	int ret, keylen = 0;
197	0	unsigned char key[32];
198	0	unsigned char iv[16];
199	0	const mbedtls_cipher_info_t *cipher_info;
200	0	mbedtls_cipher_context_t cipher_ctx;
201	0	size_t finish_olen = 0;
202	0	unsigned int padlen = 0;
203
204	0	if (pwd == NULL && pwdlen != 0) {
205	0	return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
206	0	}
207
208	0	cipher_info = mbedtls_cipher_info_from_type(cipher_type);
209	0	if (cipher_info == NULL) {
210	0	return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
211	0	}
212
213	0	keylen = cipher_info->key_bitlen / 8;
214
215	0	if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
216	0	if (output_size < len) {
217	0	return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
218	0	}
219	0	}
220
221	0	if (mode == MBEDTLS_PKCS12_PBE_ENCRYPT) {
222	0	padlen = cipher_info->block_size - (len % cipher_info->block_size);
223	0	if (output_size < (len + padlen)) {
224	0	return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
225	0	}
226	0	}
227
228	0	if ((ret = pkcs12_pbe_derive_key_iv(pbe_params, md_type, pwd, pwdlen,
229	0	key, keylen,
230	0	iv, cipher_info->iv_size)) != 0) {
231	0	return ret;
232	0	}
233
234	0	mbedtls_cipher_init(&cipher_ctx);
235
236	0	if ((ret = mbedtls_cipher_setup(&cipher_ctx, cipher_info)) != 0) {
237	0	goto exit;
238	0	}
239
240	0	if ((ret =
241	0	mbedtls_cipher_setkey(&cipher_ctx, key, 8 * keylen,
242	0	(mbedtls_operation_t) mode)) != 0) {
243	0	goto exit;
244	0	}
245
246	0	#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
247	0	{
248		/* PKCS12 uses CBC with PKCS7 padding */
249	0	mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
250		#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
251		/* For historical reasons, when decrypting, this function works when
252		* decrypting even when support for PKCS7 padding is disabled. In this
253		* case, it ignores the padding, and so will never report a
254		* password mismatch.
255		*/
256		if (mode == MBEDTLS_PKCS12_PBE_DECRYPT) {
257		padding = MBEDTLS_PADDING_NONE;
258		}
259		#endif
260	0	if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
261	0	goto exit;
262	0	}
263	0	}
264	0	#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
265
266	0	if ((ret = mbedtls_cipher_set_iv(&cipher_ctx, iv, cipher_info->iv_size)) != 0) {
267	0	goto exit;
268	0	}
269
270	0	if ((ret = mbedtls_cipher_reset(&cipher_ctx)) != 0) {
271	0	goto exit;
272	0	}
273
274	0	if ((ret = mbedtls_cipher_update(&cipher_ctx, data, len,
275	0	output, output_len)) != 0) {
276	0	goto exit;
277	0	}
278
279	0	if ((ret = mbedtls_cipher_finish(&cipher_ctx, output + (*output_len), &finish_olen)) != 0) {
280	0	ret = MBEDTLS_ERR_PKCS12_PASSWORD_MISMATCH;
281	0	}
282
283	0	*output_len += finish_olen;
284
285	0	exit:
286	0	mbedtls_platform_zeroize(key, sizeof(key));
287	0	mbedtls_platform_zeroize(iv, sizeof(iv));
288	0	mbedtls_cipher_free(&cipher_ctx);
289
290	0	return ret;
291	0	}
292
293		#endif /* MBEDTLS_ASN1_PARSE_C */
294
295		static void pkcs12_fill_buffer(unsigned char *data, size_t data_len,
296		const unsigned char *filler, size_t fill_len)
297	0	{
298	0	unsigned char *p = data;
299	0	size_t use_len;
300
301	0	if (filler != NULL && fill_len != 0) {
302	0	while (data_len > 0) {
303	0	use_len = (data_len > fill_len) ? fill_len : data_len;
304	0	memcpy(p, filler, use_len);
305	0	p += use_len;
306	0	data_len -= use_len;
307	0	}
308	0	} else {
309		/* If either of the above are not true then clearly there is nothing
310		* that this function can do. The function should not be called
311		* under either of those circumstances, as you could end up with an
312		* incorrect output but for safety's sake, leaving the check in as
313		* otherwise we could end up with memory corruption.*/
314	0	}
315	0	}
316
317		int mbedtls_pkcs12_derivation(unsigned char *data, size_t datalen,
318		const unsigned char *pwd, size_t pwdlen,
319		const unsigned char *salt, size_t saltlen,
320		mbedtls_md_type_t md_type, int id, int iterations)
321	0	{
322	0	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
323	0	unsigned int j;
324
325	0	unsigned char diversifier[128];
326	0	unsigned char salt_block[128], pwd_block[128], hash_block[128];
327	0	unsigned char hash_output[MBEDTLS_MD_MAX_SIZE];
328	0	unsigned char *p;
329	0	unsigned char c;
330	0	int use_password = 0;
331	0	int use_salt = 0;
332
333	0	size_t hlen, use_len, v, i;
334
335	0	const mbedtls_md_info_t *md_info;
336	0	mbedtls_md_context_t md_ctx;
337
338		// This version only allows max of 64 bytes of password or salt
339	0	if (datalen > 128 \|\| pwdlen > 64 \|\| saltlen > 64) {
340	0	return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
341	0	}
342
343	0	if (pwd == NULL && pwdlen != 0) {
344	0	return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
345	0	}
346
347	0	if (salt == NULL && saltlen != 0) {
348	0	return MBEDTLS_ERR_PKCS12_BAD_INPUT_DATA;
349	0	}
350
351	0	use_password = (pwd && pwdlen != 0);
352	0	use_salt = (salt && saltlen != 0);
353
354	0	md_info = mbedtls_md_info_from_type(md_type);
355	0	if (md_info == NULL) {
356	0	return MBEDTLS_ERR_PKCS12_FEATURE_UNAVAILABLE;
357	0	}
358
359	0	mbedtls_md_init(&md_ctx);
360
361	0	if ((ret = mbedtls_md_setup(&md_ctx, md_info, 0)) != 0) {
362	0	return ret;
363	0	}
364	0	hlen = mbedtls_md_get_size(md_info);
365
366	0	if (hlen <= 32) {
367	0	v = 64;
368	0	} else {
369	0	v = 128;
370	0	}
371
372	0	memset(diversifier, (unsigned char) id, v);
373
374	0	if (use_salt != 0) {
375	0	pkcs12_fill_buffer(salt_block, v, salt, saltlen);
376	0	}
377
378	0	if (use_password != 0) {
379	0	pkcs12_fill_buffer(pwd_block, v, pwd, pwdlen);
380	0	}
381
382	0	p = data;
383	0	while (datalen > 0) {
384		// Calculate hash( diversifier \|\| salt_block \|\| pwd_block )
385	0	if ((ret = mbedtls_md_starts(&md_ctx)) != 0) {
386	0	goto exit;
387	0	}
388
389	0	if ((ret = mbedtls_md_update(&md_ctx, diversifier, v)) != 0) {
390	0	goto exit;
391	0	}
392
393	0	if (use_salt != 0) {
394	0	if ((ret = mbedtls_md_update(&md_ctx, salt_block, v)) != 0) {
395	0	goto exit;
396	0	}
397	0	}
398
399	0	if (use_password != 0) {
400	0	if ((ret = mbedtls_md_update(&md_ctx, pwd_block, v)) != 0) {
401	0	goto exit;
402	0	}
403	0	}
404
405	0	if ((ret = mbedtls_md_finish(&md_ctx, hash_output)) != 0) {
406	0	goto exit;
407	0	}
408
409		// Perform remaining ( iterations - 1 ) recursive hash calculations
410	0	for (i = 1; i < (size_t) iterations; i++) {
411	0	if ((ret = mbedtls_md(md_info, hash_output, hlen, hash_output)) != 0) {
412	0	goto exit;
413	0	}
414	0	}
415
416	0	use_len = (datalen > hlen) ? hlen : datalen;
417	0	memcpy(p, hash_output, use_len);
418	0	datalen -= use_len;
419	0	p += use_len;
420
421	0	if (datalen == 0) {
422	0	break;
423	0	}
424
425		// Concatenating copies of hash_output into hash_block (B)
426	0	pkcs12_fill_buffer(hash_block, v, hash_output, hlen);
427
428		// B += 1
429	0	for (i = v; i > 0; i--) {
430	0	if (++hash_block[i - 1] != 0) {
431	0	break;
432	0	}
433	0	}
434
435	0	if (use_salt != 0) {
436		// salt_block += B
437	0	c = 0;
438	0	for (i = v; i > 0; i--) {
439	0	j = salt_block[i - 1] + hash_block[i - 1] + c;
440	0	c = MBEDTLS_BYTE_1(j);
441	0	salt_block[i - 1] = MBEDTLS_BYTE_0(j);
442	0	}
443	0	}
444
445	0	if (use_password != 0) {
446		// pwd_block += B
447	0	c = 0;
448	0	for (i = v; i > 0; i--) {
449	0	j = pwd_block[i - 1] + hash_block[i - 1] + c;
450	0	c = MBEDTLS_BYTE_1(j);
451	0	pwd_block[i - 1] = MBEDTLS_BYTE_0(j);
452	0	}
453	0	}
454	0	}
455
456	0	ret = 0;
457
458	0	exit:
459	0	mbedtls_platform_zeroize(salt_block, sizeof(salt_block));
460	0	mbedtls_platform_zeroize(pwd_block, sizeof(pwd_block));
461	0	mbedtls_platform_zeroize(hash_block, sizeof(hash_block));
462	0	mbedtls_platform_zeroize(hash_output, sizeof(hash_output));
463
464	0	mbedtls_md_free(&md_ctx);
465
466	0	return ret;
467	0	}
468
469		#endif /* MBEDTLS_PKCS12_C */