/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 1999-2004. */ /* ==================================================================== * Copyright (c) 1999 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). */ #include #include #include #include #include #include #include #include #include #include "internal.h" #include "../internal.h" static int pkcs5_pbe2_cipher_init(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, unsigned iterations, const uint8_t *pass_raw, size_t pass_raw_len, const uint8_t *salt, size_t salt_len, const uint8_t *iv, size_t iv_len, int enc) { if (iv_len != EVP_CIPHER_iv_length(cipher)) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_ERROR_SETTING_CIPHER_PARAMS); return 0; } uint8_t key[EVP_MAX_KEY_LENGTH]; int ret = PKCS5_PBKDF2_HMAC_SHA1((const char *)pass_raw, pass_raw_len, salt, salt_len, iterations, EVP_CIPHER_key_length(cipher), key) && EVP_CipherInit_ex(ctx, cipher, NULL /* engine */, key, iv, enc); OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH); return ret; } int PKCS5_pbe2_encrypt_init(CBB *out, EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, unsigned iterations, const uint8_t *pass_raw, size_t pass_raw_len, const uint8_t *salt, size_t salt_len) { int cipher_nid = EVP_CIPHER_nid(cipher); if (cipher_nid == NID_undef) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER); return 0; } /* Generate a random IV. */ uint8_t iv[EVP_MAX_IV_LENGTH]; if (!RAND_bytes(iv, EVP_CIPHER_iv_length(cipher))) { return 0; } /* See RFC 2898, appendix A. */ CBB algorithm, param, kdf, kdf_param, salt_cbb, cipher_cbb, iv_cbb; if (!CBB_add_asn1(out, &algorithm, CBS_ASN1_SEQUENCE) || !OBJ_nid2cbb(&algorithm, NID_pbes2) || !CBB_add_asn1(&algorithm, ¶m, CBS_ASN1_SEQUENCE) || !CBB_add_asn1(¶m, &kdf, CBS_ASN1_SEQUENCE) || !OBJ_nid2cbb(&kdf, NID_id_pbkdf2) || !CBB_add_asn1(&kdf, &kdf_param, CBS_ASN1_SEQUENCE) || !CBB_add_asn1(&kdf_param, &salt_cbb, CBS_ASN1_OCTETSTRING) || !CBB_add_bytes(&salt_cbb, salt, salt_len) || !CBB_add_asn1_uint64(&kdf_param, iterations) || /* Specify a key length for RC2. */ (cipher_nid == NID_rc2_cbc && !CBB_add_asn1_uint64(&kdf_param, EVP_CIPHER_key_length(cipher))) || /* Omit the PRF. We use the default hmacWithSHA1. */ !CBB_add_asn1(¶m, &cipher_cbb, CBS_ASN1_SEQUENCE) || !OBJ_nid2cbb(&cipher_cbb, cipher_nid) || /* RFC 2898 says RC2-CBC and RC5-CBC-Pad use a SEQUENCE with version and * IV, but OpenSSL always uses an OCTET STRING IV, so we do the same. */ !CBB_add_asn1(&cipher_cbb, &iv_cbb, CBS_ASN1_OCTETSTRING) || !CBB_add_bytes(&iv_cbb, iv, EVP_CIPHER_iv_length(cipher)) || !CBB_flush(out)) { return 0; } return pkcs5_pbe2_cipher_init(ctx, cipher, iterations, pass_raw, pass_raw_len, salt, salt_len, iv, EVP_CIPHER_iv_length(cipher), 1 /* encrypt */); } int PKCS5_pbe2_decrypt_init(const struct pbe_suite *suite, EVP_CIPHER_CTX *ctx, const uint8_t *pass_raw, size_t pass_raw_len, CBS *param) { CBS pbe_param, kdf, kdf_obj, enc_scheme, enc_obj; if (!CBS_get_asn1(param, &pbe_param, CBS_ASN1_SEQUENCE) || CBS_len(param) != 0 || !CBS_get_asn1(&pbe_param, &kdf, CBS_ASN1_SEQUENCE) || !CBS_get_asn1(&pbe_param, &enc_scheme, CBS_ASN1_SEQUENCE) || CBS_len(&pbe_param) != 0 || !CBS_get_asn1(&kdf, &kdf_obj, CBS_ASN1_OBJECT) || !CBS_get_asn1(&enc_scheme, &enc_obj, CBS_ASN1_OBJECT)) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR); return 0; } /* Check that the key derivation function is PBKDF2. */ if (OBJ_cbs2nid(&kdf_obj) != NID_id_pbkdf2) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION); return 0; } /* See if we recognise the encryption algorithm. */ const EVP_CIPHER *cipher = EVP_get_cipherbynid(OBJ_cbs2nid(&enc_obj)); if (cipher == NULL) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_CIPHER); return 0; } /* Parse the KDF parameters. */ CBS pbkdf2_params, salt; uint64_t iterations; if (!CBS_get_asn1(&kdf, &pbkdf2_params, CBS_ASN1_SEQUENCE) || CBS_len(&kdf) != 0 || !CBS_get_asn1(&pbkdf2_params, &salt, CBS_ASN1_OCTETSTRING) || !CBS_get_asn1_uint64(&pbkdf2_params, &iterations)) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR); return 0; } if (iterations == 0 || iterations > UINT_MAX) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_BAD_ITERATION_COUNT); return 0; } /* The optional keyLength parameter, if present, must match the key length of * the cipher. */ if (CBS_peek_asn1_tag(&pbkdf2_params, CBS_ASN1_INTEGER)) { uint64_t key_len; if (!CBS_get_asn1_uint64(&pbkdf2_params, &key_len)) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR); return 0; } if (key_len != EVP_CIPHER_key_length(cipher)) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_KEYLENGTH); return 0; } } if (CBS_len(&pbkdf2_params) != 0) { CBS prf; if (!CBS_get_asn1(&pbkdf2_params, &prf, CBS_ASN1_OBJECT) || CBS_len(&pbkdf2_params) != 0) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_DECODE_ERROR); return 0; } /* We only support hmacWithSHA1. It is the DEFAULT, so DER requires it be * omitted, but we match OpenSSL in tolerating it being present. */ if (OBJ_cbs2nid(&prf) != NID_hmacWithSHA1) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_PRF); return 0; } } /* Parse the encryption scheme parameters. Note OpenSSL does not match the * specification. Per RFC 2898, this should depend on the encryption scheme. * In particular, RC2-CBC and RC5-CBC-Pad use a SEQUENCE with version and IV. * We align with OpenSSL. */ CBS iv; if (!CBS_get_asn1(&enc_scheme, &iv, CBS_ASN1_OCTETSTRING) || CBS_len(&enc_scheme) != 0) { OPENSSL_PUT_ERROR(PKCS8, PKCS8_R_UNSUPPORTED_PRF); return 0; } return pkcs5_pbe2_cipher_init(ctx, cipher, (unsigned)iterations, pass_raw, pass_raw_len, CBS_data(&salt), CBS_len(&salt), CBS_data(&iv), CBS_len(&iv), 0 /* decrypt */); }