/*
* PKCS #5 (Password-based Encryption)
- * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2009-2015, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
#include "common.h"
#include "crypto/crypto.h"
#include "crypto/md5.h"
+#include "crypto/sha1.h"
#include "asn1.h"
#include "pkcs5.h"
struct pkcs5_params {
enum pkcs5_alg {
PKCS5_ALG_UNKNOWN,
- PKCS5_ALG_MD5_DES_CBC
+ PKCS5_ALG_MD5_DES_CBC,
+ PKCS5_ALG_PBES2,
+ PKCS5_ALG_SHA1_3DES_CBC,
} alg;
- u8 salt[8];
+ u8 salt[64];
size_t salt_len;
unsigned int iter_count;
+ enum pbes2_enc_alg {
+ PBES2_ENC_ALG_UNKNOWN,
+ PBES2_ENC_ALG_DES_EDE3_CBC,
+ } enc_alg;
+ u8 iv[8];
+ size_t iv_len;
};
+static int oid_is_rsadsi(struct asn1_oid *oid)
+{
+ return oid->len >= 4 &&
+ oid->oid[0] == 1 /* iso */ &&
+ oid->oid[1] == 2 /* member-body */ &&
+ oid->oid[2] == 840 /* us */ &&
+ oid->oid[3] == 113549 /* rsadsi */;
+}
+
+
+static int pkcs5_is_oid(struct asn1_oid *oid, unsigned long alg)
+{
+ return oid->len == 7 &&
+ oid_is_rsadsi(oid) &&
+ oid->oid[4] == 1 /* pkcs */ &&
+ oid->oid[5] == 5 /* pkcs-5 */ &&
+ oid->oid[6] == alg;
+}
+
+
+static int enc_alg_is_oid(struct asn1_oid *oid, unsigned long alg)
+{
+ return oid->len == 6 &&
+ oid_is_rsadsi(oid) &&
+ oid->oid[4] == 3 /* encryptionAlgorithm */ &&
+ oid->oid[5] == alg;
+}
+
+
+static int pkcs12_is_pbe_oid(struct asn1_oid *oid, unsigned long alg)
+{
+ return oid->len == 8 &&
+ oid_is_rsadsi(oid) &&
+ oid->oid[4] == 1 /* pkcs */ &&
+ oid->oid[5] == 12 /* pkcs-12 */ &&
+ oid->oid[6] == 1 /* pkcs-12PbeIds */ &&
+ oid->oid[7] == alg;
+}
+
+
static enum pkcs5_alg pkcs5_get_alg(struct asn1_oid *oid)
{
- if (oid->len == 7 &&
- oid->oid[0] == 1 /* iso */ &&
- oid->oid[1] == 2 /* member-body */ &&
- oid->oid[2] == 840 /* us */ &&
- oid->oid[3] == 113549 /* rsadsi */ &&
- oid->oid[4] == 1 /* pkcs */ &&
- oid->oid[5] == 5 /* pkcs-5 */ &&
- oid->oid[6] == 3 /* pbeWithMD5AndDES-CBC */)
+ if (pkcs5_is_oid(oid, 3)) /* pbeWithMD5AndDES-CBC (PBES1) */
return PKCS5_ALG_MD5_DES_CBC;
-
+ if (pkcs12_is_pbe_oid(oid, 3)) /* pbeWithSHAAnd3-KeyTripleDES-CBC */
+ return PKCS5_ALG_SHA1_3DES_CBC;
+ if (pkcs5_is_oid(oid, 13)) /* id-PBES2 (PBES2) */
+ return PKCS5_ALG_PBES2;
return PKCS5_ALG_UNKNOWN;
}
+static int pkcs5_get_params_pbes2(struct pkcs5_params *params, const u8 *pos,
+ const u8 *enc_alg_end)
+{
+ struct asn1_hdr hdr;
+ const u8 *end, *kdf_end;
+ struct asn1_oid oid;
+ char obuf[80];
+
+ /*
+ * RFC 2898, Ch. A.4
+ *
+ * PBES2-params ::= SEQUENCE {
+ * keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
+ * encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} }
+ *
+ * PBES2-KDFs ALGORITHM-IDENTIFIER ::=
+ * { {PBKDF2-params IDENTIFIED BY id-PBKDF2}, ... }
+ */
+
+ if (asn1_get_next(pos, enc_alg_end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected SEQUENCE (PBES2-params) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ pos = hdr.payload;
+ end = hdr.payload + hdr.length;
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected SEQUENCE (keyDerivationFunc) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ kdf_end = end = hdr.payload + hdr.length;
+
+ if (asn1_get_oid(pos, end - pos, &oid, &pos)) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Failed to parse OID (keyDerivationFunc algorithm)");
+ return -1;
+ }
+
+ asn1_oid_to_str(&oid, obuf, sizeof(obuf));
+ wpa_printf(MSG_DEBUG, "PKCS #5: PBES2 keyDerivationFunc algorithm %s",
+ obuf);
+ if (!pkcs5_is_oid(&oid, 12)) /* id-PBKDF2 */ {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Unsupported PBES2 keyDerivationFunc algorithm %s",
+ obuf);
+ return -1;
+ }
+
+ /*
+ * RFC 2898, C.
+ *
+ * PBKDF2-params ::= SEQUENCE {
+ * salt CHOICE {
+ * specified OCTET STRING,
+ * otherSource AlgorithmIdentifier {{PBKDF2-SaltSources}}
+ * },
+ * iterationCount INTEGER (1..MAX),
+ * keyLength INTEGER (1..MAX) OPTIONAL,
+ * prf AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT
+ * algid-hmacWithSHA1
+ * }
+ */
+
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected SEQUENCE (PBKDF2-params) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ end = hdr.payload + hdr.length;
+
+ /* For now, only support the salt CHOICE specified (OCTET STRING) */
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_OCTETSTRING ||
+ hdr.length > sizeof(params->salt)) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected OCTET STRING (salt.specified) - found class %d tag 0x%x size %d",
+ hdr.class, hdr.tag, hdr.length);
+ return -1;
+ }
+ pos = hdr.payload + hdr.length;
+ os_memcpy(params->salt, hdr.payload, hdr.length);
+ params->salt_len = hdr.length;
+ wpa_hexdump(MSG_DEBUG, "PKCS #5: salt", params->salt, params->salt_len);
+
+ /* iterationCount INTEGER */
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL || hdr.tag != ASN1_TAG_INTEGER) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected INTEGER - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+ if (hdr.length == 1) {
+ params->iter_count = *hdr.payload;
+ } else if (hdr.length == 2) {
+ params->iter_count = WPA_GET_BE16(hdr.payload);
+ } else if (hdr.length == 4) {
+ params->iter_count = WPA_GET_BE32(hdr.payload);
+ } else {
+ wpa_hexdump(MSG_DEBUG,
+ "PKCS #5: Unsupported INTEGER value (iterationCount)",
+ hdr.payload, hdr.length);
+ return -1;
+ }
+ wpa_printf(MSG_DEBUG, "PKCS #5: iterationCount=0x%x",
+ params->iter_count);
+ if (params->iter_count == 0 || params->iter_count > 0xffff) {
+ wpa_printf(MSG_INFO, "PKCS #5: Unsupported iterationCount=0x%x",
+ params->iter_count);
+ return -1;
+ }
+
+ /* For now, ignore optional keyLength and prf */
+
+ pos = kdf_end;
+
+ /* encryptionScheme AlgorithmIdentifier {{PBES2-Encs}} */
+
+ if (asn1_get_next(pos, enc_alg_end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_SEQUENCE) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected SEQUENCE (encryptionScheme) - found class %d tag 0x%x",
+ hdr.class, hdr.tag);
+ return -1;
+ }
+
+ pos = hdr.payload;
+ end = hdr.payload + hdr.length;
+
+ if (asn1_get_oid(pos, end - pos, &oid, &pos)) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Failed to parse OID (encryptionScheme algorithm)");
+ return -1;
+ }
+
+ asn1_oid_to_str(&oid, obuf, sizeof(obuf));
+ wpa_printf(MSG_DEBUG, "PKCS #5: PBES2 encryptionScheme algorithm %s",
+ obuf);
+ if (enc_alg_is_oid(&oid, 7)) {
+ params->enc_alg = PBES2_ENC_ALG_DES_EDE3_CBC;
+ } else {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Unsupported PBES2 encryptionScheme algorithm %s",
+ obuf);
+ return -1;
+ }
+
+ /*
+ * RFC 2898, B.2.2:
+ * The parameters field associated with this OID in an
+ * AlgorithmIdentifier shall have type OCTET STRING (SIZE(8)),
+ * specifying the initialization vector for CBC mode.
+ */
+ if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
+ hdr.class != ASN1_CLASS_UNIVERSAL ||
+ hdr.tag != ASN1_TAG_OCTETSTRING ||
+ hdr.length != 8) {
+ wpa_printf(MSG_DEBUG,
+ "PKCS #5: Expected OCTET STRING (SIZE(8)) (IV) - found class %d tag 0x%x size %d",
+ hdr.class, hdr.tag, hdr.length);
+ return -1;
+ }
+ os_memcpy(params->iv, hdr.payload, hdr.length);
+ params->iv_len = hdr.length;
+ wpa_hexdump(MSG_DEBUG, "PKCS #5: IV", params->iv, params->iv_len);
+
+ return 0;
+}
+
+
static int pkcs5_get_params(const u8 *enc_alg, size_t enc_alg_len,
struct pkcs5_params *params)
{
return -1;
}
+ if (params->alg == PKCS5_ALG_PBES2)
+ return pkcs5_get_params_pbes2(params, pos, enc_alg_end);
+
+ /* PBES1 */
+
/*
* PKCS#5, Section 8
* PBEParameter ::= SEQUENCE {
* salt OCTET STRING SIZE(8),
* iterationCount INTEGER }
+ *
+ * Note: The same implementation can be used to parse the PKCS #12
+ * version described in RFC 7292, C:
+ * pkcs-12PbeParams ::= SEQUENCE {
+ * salt OCTET STRING,
+ * iterations INTEGER
+ * }
*/
if (asn1_get_next(pos, enc_alg_end - pos, &hdr) < 0 ||
pos = hdr.payload;
end = hdr.payload + hdr.length;
- /* salt OCTET STRING SIZE(8) */
+ /* salt OCTET STRING SIZE(8) (PKCS #5) or OCTET STRING (PKCS #12) */
if (asn1_get_next(pos, end - pos, &hdr) < 0 ||
hdr.class != ASN1_CLASS_UNIVERSAL ||
hdr.tag != ASN1_TAG_OCTETSTRING ||
- hdr.length != 8) {
+ hdr.length > sizeof(params->salt)) {
wpa_printf(MSG_DEBUG, "PKCS #5: Expected OCTETSTRING SIZE(8) "
"(salt) - found class %d tag 0x%x size %d",
hdr.class, hdr.tag, hdr.length);
}
+static struct crypto_cipher *
+pkcs5_crypto_init_pbes2(struct pkcs5_params *params, const char *passwd)
+{
+ u8 key[24];
+
+ if (params->enc_alg != PBES2_ENC_ALG_DES_EDE3_CBC ||
+ params->iv_len != 8)
+ return NULL;
+
+ wpa_hexdump_ascii_key(MSG_DEBUG, "PKCS #5: PBES2 password for PBKDF2",
+ passwd, os_strlen(passwd));
+ wpa_hexdump(MSG_DEBUG, "PKCS #5: PBES2 salt for PBKDF2",
+ params->salt, params->salt_len);
+ wpa_printf(MSG_DEBUG, "PKCS #5: PBES2 PBKDF2 iterations: %u",
+ params->iter_count);
+ if (pbkdf2_sha1(passwd, params->salt, params->salt_len,
+ params->iter_count, key, sizeof(key)) < 0)
+ return NULL;
+ wpa_hexdump_key(MSG_DEBUG, "PKCS #5: DES EDE3 key", key, sizeof(key));
+ wpa_hexdump(MSG_DEBUG, "PKCS #5: DES IV", params->iv, params->iv_len);
+
+ return crypto_cipher_init(CRYPTO_CIPHER_ALG_3DES, params->iv,
+ key, sizeof(key));
+}
+
+
+static void add_byte_array_mod(u8 *a, const u8 *b, size_t len)
+{
+ size_t i;
+ unsigned int carry = 0;
+
+ for (i = len - 1; i < len; i--) {
+ carry = carry + a[i] + b[i];
+ a[i] = carry & 0xff;
+ carry >>= 8;
+ }
+}
+
+
+static int pkcs12_key_gen(const u8 *pw, size_t pw_len, const u8 *salt,
+ size_t salt_len, u8 id, unsigned int iter,
+ size_t out_len, u8 *out)
+{
+ unsigned int u, v, S_len, P_len, i;
+ u8 *D = NULL, *I = NULL, *B = NULL, *pos;
+ int res = -1;
+
+ /* RFC 7292, B.2 */
+ u = SHA1_MAC_LEN;
+ v = 64;
+
+ /* D = copies of ID */
+ D = os_malloc(v);
+ if (!D)
+ goto done;
+ os_memset(D, id, v);
+
+ /* S = copies of salt; P = copies of password, I = S || P */
+ S_len = v * ((salt_len + v - 1) / v);
+ P_len = v * ((pw_len + v - 1) / v);
+ I = os_malloc(S_len + P_len);
+ if (!I)
+ goto done;
+ pos = I;
+ if (salt_len) {
+ for (i = 0; i < S_len; i++)
+ *pos++ = salt[i % salt_len];
+ }
+ if (pw_len) {
+ for (i = 0; i < P_len; i++)
+ *pos++ = pw[i % pw_len];
+ }
+
+ B = os_malloc(v);
+ if (!B)
+ goto done;
+
+ for (;;) {
+ u8 hash[SHA1_MAC_LEN];
+ const u8 *addr[2];
+ size_t len[2];
+
+ addr[0] = D;
+ len[0] = v;
+ addr[1] = I;
+ len[1] = S_len + P_len;
+ if (sha1_vector(2, addr, len, hash) < 0)
+ goto done;
+
+ addr[0] = hash;
+ len[0] = SHA1_MAC_LEN;
+ for (i = 1; i < iter; i++) {
+ if (sha1_vector(1, addr, len, hash) < 0)
+ goto done;
+ }
+
+ if (out_len <= u) {
+ os_memcpy(out, hash, out_len);
+ res = 0;
+ goto done;
+ }
+
+ os_memcpy(out, hash, u);
+ out += u;
+ out_len -= u;
+
+ /* I_j = (I_j + B + 1) mod 2^(v*8) */
+ /* B = copies of Ai (final hash value) */
+ for (i = 0; i < v; i++)
+ B[i] = hash[i % u];
+ inc_byte_array(B, v);
+ for (i = 0; i < S_len + P_len; i += v)
+ add_byte_array_mod(&I[i], B, v);
+ }
+
+done:
+ os_free(B);
+ os_free(I);
+ os_free(D);
+ return res;
+}
+
+
+#define PKCS12_ID_ENC 1
+#define PKCS12_ID_IV 2
+#define PKCS12_ID_MAC 3
+
+static struct crypto_cipher *
+pkcs12_crypto_init_sha1(struct pkcs5_params *params, const char *passwd)
+{
+ unsigned int i;
+ u8 *pw;
+ size_t pw_len;
+ u8 key[24];
+ u8 iv[8];
+
+ if (params->alg != PKCS5_ALG_SHA1_3DES_CBC)
+ return NULL;
+
+ pw_len = passwd ? os_strlen(passwd) : 0;
+ pw = os_malloc(2 * (pw_len + 1));
+ if (!pw)
+ return NULL;
+ if (pw_len) {
+ for (i = 0; i <= pw_len; i++)
+ WPA_PUT_BE16(&pw[2 * i], passwd[i]);
+ pw_len = 2 * (pw_len + 1);
+ }
+
+ if (pkcs12_key_gen(pw, pw_len, params->salt, params->salt_len,
+ PKCS12_ID_ENC, params->iter_count,
+ sizeof(key), key) < 0 ||
+ pkcs12_key_gen(pw, pw_len, params->salt, params->salt_len,
+ PKCS12_ID_IV, params->iter_count,
+ sizeof(iv), iv) < 0) {
+ os_free(pw);
+ return NULL;
+ }
+
+ os_free(pw);
+
+ wpa_hexdump_key(MSG_DEBUG, "PKCS #12: DES key", key, sizeof(key));
+ wpa_hexdump_key(MSG_DEBUG, "PKCS #12: DES IV", iv, sizeof(iv));
+
+ return crypto_cipher_init(CRYPTO_CIPHER_ALG_3DES, iv, key, sizeof(key));
+}
+
+
static struct crypto_cipher * pkcs5_crypto_init(struct pkcs5_params *params,
const char *passwd)
{
const u8 *addr[2];
size_t len[2];
+ if (params->alg == PKCS5_ALG_PBES2)
+ return pkcs5_crypto_init_pbes2(params, passwd);
+
+ if (params->alg == PKCS5_ALG_SHA1_3DES_CBC)
+ return pkcs12_crypto_init_sha1(params, passwd);
+
if (params->alg != PKCS5_ALG_MD5_DES_CBC)
return NULL;
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