crypto/evp/p5_crpt2.c

   1 /*
   2  * Copyright 1999-2021 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_ex(const char *pass, int passlen,
  23                          const unsigned char *salt, int saltlen, int iter,
  24                          const EVP_MD *digest, int keylen, unsigned char *out,
  25                          OSSL_LIB_CTX *libctx, const char *propq)
  26 {
  27     const char *empty = "";
  28     int rv = 1, mode = 1;
  29     EVP_KDF *kdf;
  30     EVP_KDF_CTX *kctx;
  31     const char *mdname = EVP_MD_name(digest);
  32     OSSL_PARAM params[6], *p = params;
  33
  34     /* Keep documented behaviour. */
  35     if (pass == NULL) {
  36         pass = empty;
  37         passlen = 0;
  38     } else if (passlen == -1) {
  39         passlen = strlen(pass);
  40     }
  41     if (salt == NULL && saltlen == 0)
  42         salt = (unsigned char *)empty;
  43
  44     kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
  45     kctx = EVP_KDF_CTX_new(kdf);
  46     EVP_KDF_free(kdf);
  47     if (kctx == NULL)
  48         return 0;
  49     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
  50                                              (char *)pass, (size_t)passlen);
  51     *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
  52     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
  53                                              (unsigned char *)salt, saltlen);
  54     *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
  55     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
  56                                             (char *)mdname, 0);
  57     *p = OSSL_PARAM_construct_end();
  58     if (EVP_KDF_derive(kctx, out, keylen, params) != 1)
  59         rv = 0;
  60
  61     EVP_KDF_CTX_free(kctx);
  62
  63     OSSL_TRACE_BEGIN(PKCS5V2) {
  64         BIO_printf(trc_out, "Password:\n");
  65         BIO_hex_string(trc_out,
  66                        0, passlen, pass, passlen);
  67         BIO_printf(trc_out, "\n");
  68         BIO_printf(trc_out, "Salt:\n");
  69         BIO_hex_string(trc_out,
  70                        0, saltlen, salt, saltlen);
  71         BIO_printf(trc_out, "\n");
  72         BIO_printf(trc_out, "Iteration count %d\n", iter);
  73         BIO_printf(trc_out, "Key:\n");
  74         BIO_hex_string(trc_out,
  75                        0, keylen, out, keylen);
  76         BIO_printf(trc_out, "\n");
  77     } OSSL_TRACE_END(PKCS5V2);
  78     return rv;
  79 }
  80
  81 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
  82                       int saltlen, int iter, const EVP_MD *digest, int keylen,
  83                       unsigned char *out)
  84 {
  85     return pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, digest,
  86                                 keylen, out, NULL, NULL);
  87 }
  88
  89
  90 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
  91                            const unsigned char *salt, int saltlen, int iter,
  92                            int keylen, unsigned char *out)
  93 {
  94     return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
  95                              keylen, out);
  96 }
  97
  98 /*
  99  * Now the key derivation function itself. This is a bit evil because it has
 100  * to check the ASN1 parameters are valid: and there are quite a few of
 101  * them...
 102  */
 103
 104 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 105                           ASN1_TYPE *param, const EVP_CIPHER *c,
 106                           const EVP_MD *md, int en_de)
 107 {
 108     PBE2PARAM *pbe2 = NULL;
 109     const EVP_CIPHER *cipher;
 110     EVP_PBE_KEYGEN *kdf;
 111
 112     int rv = 0;
 113
 114     pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
 115     if (pbe2 == NULL) {
 116         ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
 117         goto err;
 118     }
 119
 120     /* See if we recognise the key derivation function */
 121     if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
 122                         NULL, NULL, &kdf)) {
 123         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
 124         goto err;
 125     }
 126
 127     /*
 128      * lets see if we recognise the encryption algorithm.
 129      */
 130
 131     cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
 132
 133     if (!cipher) {
 134         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
 135         goto err;
 136     }
 137
 138     /* Fixup cipher based on AlgorithmIdentifier */
 139     if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
 140         goto err;
 141     if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
 142         ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
 143         goto err;
 144     }
 145     rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
 146  err:
 147     PBE2PARAM_free(pbe2);
 148     return rv;
 149 }
 150
 151 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
 152                              int passlen, ASN1_TYPE *param,
 153                              const EVP_CIPHER *c, const EVP_MD *md, int en_de)
 154 {
 155     unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
 156     int saltlen, iter, t;
 157     int rv = 0;
 158     unsigned int keylen = 0;
 159     int prf_nid, hmac_md_nid;
 160     PBKDF2PARAM *kdf = NULL;
 161     const EVP_MD *prfmd;
 162
 163     if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
 164         ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
 165         goto err;
 166     }
 167     keylen = EVP_CIPHER_CTX_key_length(ctx);
 168     OPENSSL_assert(keylen <= sizeof(key));
 169
 170     /* Decode parameter */
 171
 172     kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
 173
 174     if (kdf == NULL) {
 175         ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
 176         goto err;
 177     }
 178
 179     t = EVP_CIPHER_CTX_key_length(ctx);
 180     if (t < 0) {
 181         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
 182         goto err;
 183     }
 184     keylen = t;
 185
 186     /* Now check the parameters of the kdf */
 187
 188     if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
 189         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
 190         goto err;
 191     }
 192
 193     if (kdf->prf)
 194         prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
 195     else
 196         prf_nid = NID_hmacWithSHA1;
 197
 198     if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
 199         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
 200         goto err;
 201     }
 202
 203     prfmd = EVP_get_digestbynid(hmac_md_nid);
 204     if (prfmd == NULL) {
 205         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
 206         goto err;
 207     }
 208
 209     if (kdf->salt->type != V_ASN1_OCTET_STRING) {
 210         ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_SALT_TYPE);
 211         goto err;
 212     }
 213
 214     /* it seems that its all OK */
 215     salt = kdf->salt->value.octet_string->data;
 216     saltlen = kdf->salt->value.octet_string->length;
 217     iter = ASN1_INTEGER_get(kdf->iter);
 218     if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
 219                            keylen, key))
 220         goto err;
 221     rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
 222  err:
 223     OPENSSL_cleanse(key, keylen);
 224     PBKDF2PARAM_free(kdf);
 225     return rv;
 226 }