crypto/evp/p5_crpt2.c

   1 /*
   2  * Copyright 1999-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include "internal/cryptlib.h"
  13 #include <openssl/x509.h>
  14 #include <openssl/evp.h>
  15 #include <openssl/kdf.h>
  16 #include <openssl/hmac.h>
  17 #include <openssl/trace.h>
  18 #include <openssl/core_names.h>
  19 #include "crypto/evp.h"
  20 #include "evp_local.h"
  21
  22 int pkcs5_pbkdf2_hmac_with_libctx(const char *pass, int passlen,
  23                                   const unsigned char *salt, int saltlen,
  24                                   int iter, const EVP_MD *digest, int keylen,
  25                                   unsigned char *out,
  26                                   OPENSSL_CTX *libctx, const char *propq)
  27 {
  28     const char *empty = "";
  29     int rv = 1, mode = 1;
  30     EVP_KDF *kdf;
  31     EVP_KDF_CTX *kctx;
  32     const char *mdname = EVP_MD_name(digest);
  33     OSSL_PARAM params[6], *p = params;
  34
  35     /* Keep documented behaviour. */
  36     if (pass == NULL) {
  37         pass = empty;
  38         passlen = 0;
  39     } else if (passlen == -1) {
  40         passlen = strlen(pass);
  41     }
  42     if (salt == NULL && saltlen == 0)
  43         salt = (unsigned char *)empty;
  44
  45     kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
  46     kctx = EVP_KDF_CTX_new(kdf);
  47     EVP_KDF_free(kdf);
  48     if (kctx == NULL)
  49         return 0;
  50     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
  51                                              (char *)pass, (size_t)passlen);
  52     *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
  53     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
  54                                              (unsigned char *)salt, saltlen);
  55     *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
  56     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  57                                             (char *)mdname, 0);
  58     *p = OSSL_PARAM_construct_end();
  59     if (EVP_KDF_CTX_set_params(kctx, params) != 1
  60             || EVP_KDF_derive(kctx, out, keylen) != 1)
  61         rv = 0;
  62
  63     EVP_KDF_CTX_free(kctx);
  64
  65     OSSL_TRACE_BEGIN(PKCS5V2) {
  66         BIO_printf(trc_out, "Password:\n");
  67         BIO_hex_string(trc_out,
  68                        0, passlen, pass, passlen);
  69         BIO_printf(trc_out, "\n");
  70         BIO_printf(trc_out, "Salt:\n");
  71         BIO_hex_string(trc_out,
  72                        0, saltlen, salt, saltlen);
  73         BIO_printf(trc_out, "\n");
  74         BIO_printf(trc_out, "Iteration count %d\n", iter);
  75         BIO_printf(trc_out, "Key:\n");
  76         BIO_hex_string(trc_out,
  77                        0, keylen, out, keylen);
  78         BIO_printf(trc_out, "\n");
  79     } OSSL_TRACE_END(PKCS5V2);
  80     return rv;
  81 }
  82
  83 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
  84                       int saltlen, int iter, const EVP_MD *digest, int keylen,
  85                       unsigned char *out)
  86 {
  87     return pkcs5_pbkdf2_hmac_with_libctx(pass, passlen, salt, saltlen, iter,
  88                                          digest, keylen, out, NULL, NULL);
  89 }
  90
  91
  92 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
  93                            const unsigned char *salt, int saltlen, int iter,
  94                            int keylen, unsigned char *out)
  95 {
  96     return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
  97                              keylen, out);
  98 }
  99
 100 /*
 101  * Now the key derivation function itself. This is a bit evil because it has
 102  * to check the ASN1 parameters are valid: and there are quite a few of
 103  * them...
 104  */
 105
 106 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 107                           ASN1_TYPE *param, const EVP_CIPHER *c,
 108                           const EVP_MD *md, int en_de)
 109 {
 110     PBE2PARAM *pbe2 = NULL;
 111     const EVP_CIPHER *cipher;
 112     EVP_PBE_KEYGEN *kdf;
 113
 114     int rv = 0;
 115
 116     pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
 117     if (pbe2 == NULL) {
 118         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
 119         goto err;
 120     }
 121
 122     /* See if we recognise the key derivation function */
 123     if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
 124                         NULL, NULL, &kdf)) {
 125         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 126                EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
 127         goto err;
 128     }
 129
 130     /*
 131      * lets see if we recognise the encryption algorithm.
 132      */
 133
 134     cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
 135
 136     if (!cipher) {
 137         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
 138         goto err;
 139     }
 140
 141     /* Fixup cipher based on AlgorithmIdentifier */
 142     if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
 143         goto err;
 144     if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
 145         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
 146         goto err;
 147     }
 148     rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
 149  err:
 150     PBE2PARAM_free(pbe2);
 151     return rv;
 152 }
 153
 154 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
 155                              int passlen, ASN1_TYPE *param,
 156                              const EVP_CIPHER *c, const EVP_MD *md, int en_de)
 157 {
 158     unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
 159     int saltlen, iter, t;
 160     int rv = 0;
 161     unsigned int keylen = 0;
 162     int prf_nid, hmac_md_nid;
 163     PBKDF2PARAM *kdf = NULL;
 164     const EVP_MD *prfmd;
 165
 166     if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
 167         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
 168         goto err;
 169     }
 170     keylen = EVP_CIPHER_CTX_key_length(ctx);
 171     OPENSSL_assert(keylen <= sizeof(key));
 172
 173     /* Decode parameter */
 174
 175     kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
 176
 177     if (kdf == NULL) {
 178         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
 179         goto err;
 180     }
 181
 182     t = EVP_CIPHER_CTX_key_length(ctx);
 183     if (t < 0) {
 184         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
 185         goto err;
 186     }
 187     keylen = t;
 188
 189     /* Now check the parameters of the kdf */
 190
 191     if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
 192         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
 193         goto err;
 194     }
 195
 196     if (kdf->prf)
 197         prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
 198     else
 199         prf_nid = NID_hmacWithSHA1;
 200
 201     if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
 202         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 203         goto err;
 204     }
 205
 206     prfmd = EVP_get_digestbynid(hmac_md_nid);
 207     if (prfmd == NULL) {
 208         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 209         goto err;
 210     }
 211
 212     if (kdf->salt->type != V_ASN1_OCTET_STRING) {
 213         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
 214         goto err;
 215     }
 216
 217     /* it seems that its all OK */
 218     salt = kdf->salt->value.octet_string->data;
 219     saltlen = kdf->salt->value.octet_string->length;
 220     iter = ASN1_INTEGER_get(kdf->iter);
 221     if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
 222                            keylen, key))
 223         goto err;
 224     rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
 225  err:
 226     OPENSSL_cleanse(key, keylen);
 227     PBKDF2PARAM_free(kdf);
 228     return rv;
 229 }