[331] | 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <stdlib.h>
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| 12 | #include "internal/cryptlib.h"
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| 13 | # include <openssl/x509.h>
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| 14 | # include <openssl/evp.h>
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| 15 | # include <openssl/hmac.h>
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| 16 | # include "evp_locl.h"
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| 17 |
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| 18 | /* set this to print out info about the keygen algorithm */
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| 19 | /* #define OPENSSL_DEBUG_PKCS5V2 */
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| 20 |
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| 21 | # ifdef OPENSSL_DEBUG_PKCS5V2
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| 22 | static void h__dump(const unsigned char *p, int len);
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| 23 | # endif
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| 24 |
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| 25 | /*
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| 26 | * This is an implementation of PKCS#5 v2.0 password based encryption key
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| 27 | * derivation function PBKDF2. SHA1 version verified against test vectors
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| 28 | * posted by Peter Gutmann <pgut001@cs.auckland.ac.nz> to the PKCS-TNG
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| 29 | * <pkcs-tng@rsa.com> mailing list.
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| 30 | */
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| 31 |
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| 32 | int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
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| 33 | const unsigned char *salt, int saltlen, int iter,
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| 34 | const EVP_MD *digest, int keylen, unsigned char *out)
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| 35 | {
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| 36 | unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
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| 37 | int cplen, j, k, tkeylen, mdlen;
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| 38 | unsigned long i = 1;
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| 39 | HMAC_CTX *hctx_tpl = NULL, *hctx = NULL;
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| 40 |
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| 41 | mdlen = EVP_MD_size(digest);
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| 42 | if (mdlen < 0)
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| 43 | return 0;
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| 44 |
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| 45 | hctx_tpl = HMAC_CTX_new();
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| 46 | if (hctx_tpl == NULL)
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| 47 | return 0;
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| 48 | p = out;
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| 49 | tkeylen = keylen;
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| 50 | if (!pass)
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| 51 | passlen = 0;
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| 52 | else if (passlen == -1)
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| 53 | passlen = strlen(pass);
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| 54 | if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL)) {
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| 55 | HMAC_CTX_free(hctx_tpl);
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| 56 | return 0;
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| 57 | }
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| 58 | hctx = HMAC_CTX_new();
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| 59 | if (hctx == NULL) {
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| 60 | HMAC_CTX_free(hctx_tpl);
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| 61 | return 0;
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| 62 | }
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| 63 | while (tkeylen) {
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| 64 | if (tkeylen > mdlen)
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| 65 | cplen = mdlen;
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| 66 | else
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| 67 | cplen = tkeylen;
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| 68 | /*
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| 69 | * We are unlikely to ever use more than 256 blocks (5120 bits!) but
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| 70 | * just in case...
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| 71 | */
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| 72 | itmp[0] = (unsigned char)((i >> 24) & 0xff);
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| 73 | itmp[1] = (unsigned char)((i >> 16) & 0xff);
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| 74 | itmp[2] = (unsigned char)((i >> 8) & 0xff);
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| 75 | itmp[3] = (unsigned char)(i & 0xff);
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| 76 | if (!HMAC_CTX_copy(hctx, hctx_tpl)) {
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| 77 | HMAC_CTX_free(hctx);
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| 78 | HMAC_CTX_free(hctx_tpl);
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| 79 | return 0;
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| 80 | }
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| 81 | if (!HMAC_Update(hctx, salt, saltlen)
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| 82 | || !HMAC_Update(hctx, itmp, 4)
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| 83 | || !HMAC_Final(hctx, digtmp, NULL)) {
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| 84 | HMAC_CTX_free(hctx);
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| 85 | HMAC_CTX_free(hctx_tpl);
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| 86 | return 0;
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| 87 | }
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| 88 | HMAC_CTX_reset(hctx);
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| 89 | memcpy(p, digtmp, cplen);
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| 90 | for (j = 1; j < iter; j++) {
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| 91 | if (!HMAC_CTX_copy(hctx, hctx_tpl)) {
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| 92 | HMAC_CTX_free(hctx);
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| 93 | HMAC_CTX_free(hctx_tpl);
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| 94 | return 0;
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| 95 | }
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| 96 | if (!HMAC_Update(hctx, digtmp, mdlen)
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| 97 | || !HMAC_Final(hctx, digtmp, NULL)) {
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| 98 | HMAC_CTX_free(hctx);
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| 99 | HMAC_CTX_free(hctx_tpl);
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| 100 | return 0;
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| 101 | }
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| 102 | HMAC_CTX_reset(hctx);
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| 103 | for (k = 0; k < cplen; k++)
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| 104 | p[k] ^= digtmp[k];
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| 105 | }
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| 106 | tkeylen -= cplen;
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| 107 | i++;
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| 108 | p += cplen;
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| 109 | }
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| 110 | HMAC_CTX_free(hctx);
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| 111 | HMAC_CTX_free(hctx_tpl);
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| 112 | # ifdef OPENSSL_DEBUG_PKCS5V2
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| 113 | fprintf(stderr, "Password:\n");
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| 114 | h__dump(pass, passlen);
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| 115 | fprintf(stderr, "Salt:\n");
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| 116 | h__dump(salt, saltlen);
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| 117 | fprintf(stderr, "Iteration count %d\n", iter);
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| 118 | fprintf(stderr, "Key:\n");
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| 119 | h__dump(out, keylen);
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| 120 | # endif
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| 121 | return 1;
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| 122 | }
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| 123 |
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| 124 | int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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| 125 | const unsigned char *salt, int saltlen, int iter,
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| 126 | int keylen, unsigned char *out)
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| 127 | {
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| 128 | return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
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| 129 | keylen, out);
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| 130 | }
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| 131 |
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| 132 | # ifdef DO_TEST
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| 133 | main()
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| 134 | {
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| 135 | unsigned char out[4];
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| 136 | unsigned char salt[] = { 0x12, 0x34, 0x56, 0x78 };
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| 137 | PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
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| 138 | fprintf(stderr, "Out %02X %02X %02X %02X\n",
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| 139 | out[0], out[1], out[2], out[3]);
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| 140 | }
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| 141 |
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| 142 | # endif
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| 143 |
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| 144 | /*
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| 145 | * Now the key derivation function itself. This is a bit evil because it has
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| 146 | * to check the ASN1 parameters are valid: and there are quite a few of
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| 147 | * them...
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| 148 | */
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| 149 |
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| 150 | int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
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| 151 | ASN1_TYPE *param, const EVP_CIPHER *c,
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| 152 | const EVP_MD *md, int en_de)
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| 153 | {
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| 154 | PBE2PARAM *pbe2 = NULL;
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| 155 | const EVP_CIPHER *cipher;
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| 156 | EVP_PBE_KEYGEN *kdf;
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| 157 |
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| 158 | int rv = 0;
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| 159 |
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| 160 | pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
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| 161 | if (pbe2 == NULL) {
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| 162 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
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| 163 | goto err;
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| 164 | }
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| 165 |
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| 166 | /* See if we recognise the key derivation function */
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| 167 | if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
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| 168 | NULL, NULL, &kdf)) {
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| 169 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
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| 170 | EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
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| 171 | goto err;
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| 172 | }
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| 173 |
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| 174 | /*
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| 175 | * lets see if we recognise the encryption algorithm.
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| 176 | */
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| 177 |
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| 178 | cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
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| 179 |
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| 180 | if (!cipher) {
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| 181 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
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| 182 | goto err;
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| 183 | }
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| 184 |
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| 185 | /* Fixup cipher based on AlgorithmIdentifier */
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| 186 | if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
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| 187 | goto err;
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| 188 | if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
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| 189 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
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| 190 | goto err;
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| 191 | }
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| 192 | rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
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| 193 | err:
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| 194 | PBE2PARAM_free(pbe2);
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| 195 | return rv;
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| 196 | }
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| 197 |
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| 198 | int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
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| 199 | int passlen, ASN1_TYPE *param,
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| 200 | const EVP_CIPHER *c, const EVP_MD *md, int en_de)
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| 201 | {
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| 202 | unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
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| 203 | int saltlen, iter;
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| 204 | int rv = 0;
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| 205 | unsigned int keylen = 0;
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| 206 | int prf_nid, hmac_md_nid;
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| 207 | PBKDF2PARAM *kdf = NULL;
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| 208 | const EVP_MD *prfmd;
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| 209 |
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| 210 | if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
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| 211 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
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| 212 | goto err;
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| 213 | }
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| 214 | keylen = EVP_CIPHER_CTX_key_length(ctx);
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| 215 | OPENSSL_assert(keylen <= sizeof key);
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| 216 |
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| 217 | /* Decode parameter */
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| 218 |
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| 219 | kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
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| 220 |
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| 221 | if (kdf == NULL) {
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| 222 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
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| 223 | goto err;
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| 224 | }
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| 225 |
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| 226 | keylen = EVP_CIPHER_CTX_key_length(ctx);
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| 227 |
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| 228 | /* Now check the parameters of the kdf */
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| 229 |
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| 230 | if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
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| 231 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
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| 232 | goto err;
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| 233 | }
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| 234 |
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| 235 | if (kdf->prf)
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| 236 | prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
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| 237 | else
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| 238 | prf_nid = NID_hmacWithSHA1;
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| 239 |
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| 240 | if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
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| 241 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
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| 242 | goto err;
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| 243 | }
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| 244 |
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| 245 | prfmd = EVP_get_digestbynid(hmac_md_nid);
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| 246 | if (prfmd == NULL) {
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| 247 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
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| 248 | goto err;
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| 249 | }
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| 250 |
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| 251 | if (kdf->salt->type != V_ASN1_OCTET_STRING) {
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| 252 | EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
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| 253 | goto err;
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| 254 | }
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| 255 |
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| 256 | /* it seems that its all OK */
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| 257 | salt = kdf->salt->value.octet_string->data;
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| 258 | saltlen = kdf->salt->value.octet_string->length;
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| 259 | iter = ASN1_INTEGER_get(kdf->iter);
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| 260 | if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
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| 261 | keylen, key))
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| 262 | goto err;
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| 263 | rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
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| 264 | err:
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| 265 | OPENSSL_cleanse(key, keylen);
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| 266 | PBKDF2PARAM_free(kdf);
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| 267 | return rv;
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| 268 | }
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| 269 |
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| 270 | # ifdef OPENSSL_DEBUG_PKCS5V2
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| 271 | static void h__dump(const unsigned char *p, int len)
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| 272 | {
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| 273 | for (; len--; p++)
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| 274 | fprintf(stderr, "%02X ", *p);
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| 275 | fprintf(stderr, "\n");
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| 276 | }
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| 277 | # endif
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