mirror of
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da1c088f59
Reviewed-by: Richard Levitte <levitte@openssl.org> Release: yes
272 lines
8.9 KiB
C
272 lines
8.9 KiB
C
/*
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* Copyright 1999-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "internal/cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/evp.h>
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#include <openssl/kdf.h>
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#include <openssl/hmac.h>
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#include <openssl/trace.h>
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#include <openssl/core_names.h>
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#include "crypto/evp.h"
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#include "evp_local.h"
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int ossl_pkcs5_pbkdf2_hmac_ex(const char *pass, int passlen,
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const unsigned char *salt, int saltlen, int iter,
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const EVP_MD *digest, int keylen, unsigned char *out,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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const char *empty = "";
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int rv = 1, mode = 1;
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EVP_KDF *kdf;
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EVP_KDF_CTX *kctx;
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const char *mdname = EVP_MD_get0_name(digest);
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OSSL_PARAM params[6], *p = params;
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/* Keep documented behaviour. */
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if (pass == NULL) {
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pass = empty;
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passlen = 0;
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} else if (passlen == -1) {
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passlen = strlen(pass);
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}
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if (salt == NULL && saltlen == 0)
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salt = (unsigned char *)empty;
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kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
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if (kdf == NULL)
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return 0;
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kctx = EVP_KDF_CTX_new(kdf);
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EVP_KDF_free(kdf);
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if (kctx == NULL)
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return 0;
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
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(char *)pass, (size_t)passlen);
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*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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(unsigned char *)salt, saltlen);
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*p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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(char *)mdname, 0);
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*p = OSSL_PARAM_construct_end();
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if (EVP_KDF_derive(kctx, out, keylen, params) != 1)
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rv = 0;
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EVP_KDF_CTX_free(kctx);
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OSSL_TRACE_BEGIN(PKCS5V2) {
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BIO_printf(trc_out, "Password:\n");
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BIO_hex_string(trc_out,
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0, passlen, pass, passlen);
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BIO_printf(trc_out, "\n");
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BIO_printf(trc_out, "Salt:\n");
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BIO_hex_string(trc_out,
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0, saltlen, salt, saltlen);
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BIO_printf(trc_out, "\n");
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BIO_printf(trc_out, "Iteration count %d\n", iter);
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BIO_printf(trc_out, "Key:\n");
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BIO_hex_string(trc_out,
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0, keylen, out, keylen);
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BIO_printf(trc_out, "\n");
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} OSSL_TRACE_END(PKCS5V2);
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return rv;
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}
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int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
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int saltlen, int iter, const EVP_MD *digest, int keylen,
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unsigned char *out)
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{
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return ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, digest,
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keylen, out, NULL, NULL);
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}
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int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
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const unsigned char *salt, int saltlen, int iter,
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int keylen, unsigned char *out)
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{
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EVP_MD *digest;
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int r = 0;
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if ((digest = EVP_MD_fetch(NULL, SN_sha1, NULL)) != NULL)
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r = ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter,
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digest, keylen, out, NULL, NULL);
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EVP_MD_free(digest);
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return r;
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}
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/*
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* Now the key derivation function itself. This is a bit evil because it has
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* to check the ASN1 parameters are valid: and there are quite a few of
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* them...
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*/
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int PKCS5_v2_PBE_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
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ASN1_TYPE *param, const EVP_CIPHER *c,
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const EVP_MD *md, int en_de,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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PBE2PARAM *pbe2 = NULL;
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char ciph_name[80];
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const EVP_CIPHER *cipher = NULL;
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EVP_CIPHER *cipher_fetch = NULL;
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EVP_PBE_KEYGEN_EX *kdf;
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int rv = 0;
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pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
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if (pbe2 == NULL) {
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ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
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goto err;
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}
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/* See if we recognise the key derivation function */
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if (!EVP_PBE_find_ex(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
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NULL, NULL, NULL, &kdf)) {
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
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goto err;
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}
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/*
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* lets see if we recognise the encryption algorithm.
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*/
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if (OBJ_obj2txt(ciph_name, sizeof(ciph_name), pbe2->encryption->algorithm, 0) <= 0) {
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
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goto err;
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}
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(void)ERR_set_mark();
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cipher = cipher_fetch = EVP_CIPHER_fetch(libctx, ciph_name, propq);
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/* Fallback to legacy method */
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if (cipher == NULL)
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cipher = EVP_get_cipherbyname(ciph_name);
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if (cipher == NULL) {
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(void)ERR_clear_last_mark();
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
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goto err;
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}
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(void)ERR_pop_to_mark();
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/* Fixup cipher based on AlgorithmIdentifier */
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if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
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goto err;
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if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) <= 0) {
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ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
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goto err;
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}
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rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de, libctx, propq);
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err:
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EVP_CIPHER_free(cipher_fetch);
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PBE2PARAM_free(pbe2);
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return rv;
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}
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int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
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ASN1_TYPE *param, const EVP_CIPHER *c,
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const EVP_MD *md, int en_de)
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{
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return PKCS5_v2_PBE_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de, NULL, NULL);
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}
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int PKCS5_v2_PBKDF2_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass,
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int passlen, ASN1_TYPE *param,
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const EVP_CIPHER *c, const EVP_MD *md, int en_de,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
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int saltlen, iter, t;
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int rv = 0;
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unsigned int keylen = 0;
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int prf_nid, hmac_md_nid;
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PBKDF2PARAM *kdf = NULL;
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const EVP_MD *prfmd = NULL;
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EVP_MD *prfmd_fetch = NULL;
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if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
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ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
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goto err;
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}
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keylen = EVP_CIPHER_CTX_get_key_length(ctx);
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OPENSSL_assert(keylen <= sizeof(key));
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/* Decode parameter */
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kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
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if (kdf == NULL) {
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ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
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goto err;
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}
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t = EVP_CIPHER_CTX_get_key_length(ctx);
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if (t < 0) {
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ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
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goto err;
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}
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keylen = t;
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/* Now check the parameters of the kdf */
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if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
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goto err;
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}
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if (kdf->prf)
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prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
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else
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prf_nid = NID_hmacWithSHA1;
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if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
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goto err;
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}
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(void)ERR_set_mark();
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prfmd = prfmd_fetch = EVP_MD_fetch(libctx, OBJ_nid2sn(hmac_md_nid), propq);
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if (prfmd == NULL)
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prfmd = EVP_get_digestbynid(hmac_md_nid);
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if (prfmd == NULL) {
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(void)ERR_clear_last_mark();
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
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goto err;
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}
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(void)ERR_pop_to_mark();
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if (kdf->salt->type != V_ASN1_OCTET_STRING) {
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ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_SALT_TYPE);
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goto err;
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}
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/* it seems that its all OK */
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salt = kdf->salt->value.octet_string->data;
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saltlen = kdf->salt->value.octet_string->length;
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iter = ASN1_INTEGER_get(kdf->iter);
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if (!ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, prfmd,
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keylen, key, libctx, propq))
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goto err;
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rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
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err:
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OPENSSL_cleanse(key, keylen);
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PBKDF2PARAM_free(kdf);
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EVP_MD_free(prfmd_fetch);
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return rv;
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}
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int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
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int passlen, ASN1_TYPE *param,
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const EVP_CIPHER *c, const EVP_MD *md, int en_de)
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{
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return PKCS5_v2_PBKDF2_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de,
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NULL, NULL);
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}
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