394 lines
12 KiB
C
394 lines
12 KiB
C
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/*
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* Copyright 2018-2023 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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/*
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* HMAC low level APIs are deprecated for public use, but still ok for internal
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* use.
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*/
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#include "internal/deprecated.h"
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <openssl/hmac.h>
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#include <openssl/evp.h>
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#include <openssl/kdf.h>
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#include <openssl/core_names.h>
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#include <openssl/proverr.h>
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#include "internal/cryptlib.h"
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#include "internal/numbers.h"
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#include "crypto/evp.h"
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#include "prov/provider_ctx.h"
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#include "prov/providercommon.h"
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#include "prov/implementations.h"
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#include "prov/provider_util.h"
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#include "pbkdf2.h"
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/* Constants specified in SP800-132 */
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#define KDF_PBKDF2_MIN_KEY_LEN_BITS 112
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#define KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO 0xFFFFFFFF
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#define KDF_PBKDF2_MIN_ITERATIONS 1000
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#define KDF_PBKDF2_MIN_SALT_LEN (128 / 8)
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static OSSL_FUNC_kdf_newctx_fn kdf_pbkdf2_new;
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static OSSL_FUNC_kdf_dupctx_fn kdf_pbkdf2_dup;
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static OSSL_FUNC_kdf_freectx_fn kdf_pbkdf2_free;
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static OSSL_FUNC_kdf_reset_fn kdf_pbkdf2_reset;
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static OSSL_FUNC_kdf_derive_fn kdf_pbkdf2_derive;
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static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pbkdf2_settable_ctx_params;
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static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pbkdf2_set_ctx_params;
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static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pbkdf2_gettable_ctx_params;
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static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pbkdf2_get_ctx_params;
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static int pbkdf2_derive(const char *pass, size_t passlen,
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const unsigned char *salt, int saltlen, uint64_t iter,
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const EVP_MD *digest, unsigned char *key,
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size_t keylen, int extra_checks);
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typedef struct {
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void *provctx;
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unsigned char *pass;
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size_t pass_len;
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unsigned char *salt;
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size_t salt_len;
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uint64_t iter;
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PROV_DIGEST digest;
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int lower_bound_checks;
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} KDF_PBKDF2;
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static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx);
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static void *kdf_pbkdf2_new_no_init(void *provctx)
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{
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KDF_PBKDF2 *ctx;
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if (!ossl_prov_is_running())
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return NULL;
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ctx = OPENSSL_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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ctx->provctx = provctx;
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return ctx;
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}
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static void *kdf_pbkdf2_new(void *provctx)
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{
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KDF_PBKDF2 *ctx = kdf_pbkdf2_new_no_init(provctx);
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if (ctx != NULL)
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kdf_pbkdf2_init(ctx);
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return ctx;
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}
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static void kdf_pbkdf2_cleanup(KDF_PBKDF2 *ctx)
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{
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ossl_prov_digest_reset(&ctx->digest);
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OPENSSL_free(ctx->salt);
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OPENSSL_clear_free(ctx->pass, ctx->pass_len);
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memset(ctx, 0, sizeof(*ctx));
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}
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static void kdf_pbkdf2_free(void *vctx)
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{
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KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;
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if (ctx != NULL) {
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kdf_pbkdf2_cleanup(ctx);
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OPENSSL_free(ctx);
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}
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}
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static void kdf_pbkdf2_reset(void *vctx)
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{
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KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;
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void *provctx = ctx->provctx;
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kdf_pbkdf2_cleanup(ctx);
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ctx->provctx = provctx;
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kdf_pbkdf2_init(ctx);
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}
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static void *kdf_pbkdf2_dup(void *vctx)
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{
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const KDF_PBKDF2 *src = (const KDF_PBKDF2 *)vctx;
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KDF_PBKDF2 *dest;
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/* We need a new PBKDF2 object but uninitialised since we're filling it */
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dest = kdf_pbkdf2_new_no_init(src->provctx);
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if (dest != NULL) {
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if (!ossl_prov_memdup(src->salt, src->salt_len,
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&dest->salt, &dest->salt_len)
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|| !ossl_prov_memdup(src->pass, src->pass_len,
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&dest->pass, &dest->pass_len)
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|| !ossl_prov_digest_copy(&dest->digest, &src->digest))
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goto err;
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dest->iter = src->iter;
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dest->lower_bound_checks = src->lower_bound_checks;
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}
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return dest;
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err:
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kdf_pbkdf2_free(dest);
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return NULL;
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}
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static void kdf_pbkdf2_init(KDF_PBKDF2 *ctx)
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{
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OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
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OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
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params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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SN_sha1, 0);
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if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
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/* This is an error, but there is no way to indicate such directly */
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ossl_prov_digest_reset(&ctx->digest);
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ctx->iter = PKCS5_DEFAULT_ITER;
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ctx->lower_bound_checks = ossl_kdf_pbkdf2_default_checks;
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}
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static int pbkdf2_set_membuf(unsigned char **buffer, size_t *buflen,
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const OSSL_PARAM *p)
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{
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OPENSSL_clear_free(*buffer, *buflen);
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*buffer = NULL;
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*buflen = 0;
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if (p->data_size == 0) {
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if ((*buffer = OPENSSL_malloc(1)) == NULL)
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return 0;
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} else if (p->data != NULL) {
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if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
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return 0;
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}
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return 1;
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}
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static int kdf_pbkdf2_derive(void *vctx, unsigned char *key, size_t keylen,
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const OSSL_PARAM params[])
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{
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KDF_PBKDF2 *ctx = (KDF_PBKDF2 *)vctx;
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const EVP_MD *md;
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if (!ossl_prov_is_running() || !kdf_pbkdf2_set_ctx_params(ctx, params))
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return 0;
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if (ctx->pass == NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
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return 0;
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}
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if (ctx->salt == NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
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return 0;
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}
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md = ossl_prov_digest_md(&ctx->digest);
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return pbkdf2_derive((char *)ctx->pass, ctx->pass_len,
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ctx->salt, ctx->salt_len, ctx->iter,
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md, key, keylen, ctx->lower_bound_checks);
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}
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static int kdf_pbkdf2_set_ctx_params(void *vctx, const OSSL_PARAM params[])
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{
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const OSSL_PARAM *p;
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KDF_PBKDF2 *ctx = vctx;
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OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
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int pkcs5;
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uint64_t iter, min_iter;
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if (params == NULL)
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return 1;
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if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
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return 0;
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if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PKCS5)) != NULL) {
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if (!OSSL_PARAM_get_int(p, &pkcs5))
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return 0;
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ctx->lower_bound_checks = pkcs5 == 0;
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}
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if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
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if (!pbkdf2_set_membuf(&ctx->pass, &ctx->pass_len, p))
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return 0;
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if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
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if (ctx->lower_bound_checks != 0
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&& p->data_size < KDF_PBKDF2_MIN_SALT_LEN) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
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return 0;
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}
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if (!pbkdf2_set_membuf(&ctx->salt, &ctx->salt_len, p))
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return 0;
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}
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if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_ITER)) != NULL) {
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if (!OSSL_PARAM_get_uint64(p, &iter))
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return 0;
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min_iter = ctx->lower_bound_checks != 0 ? KDF_PBKDF2_MIN_ITERATIONS : 1;
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if (iter < min_iter) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
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return 0;
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}
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ctx->iter = iter;
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}
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return 1;
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}
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static const OSSL_PARAM *kdf_pbkdf2_settable_ctx_params(ossl_unused void *ctx,
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ossl_unused void *p_ctx)
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{
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static const OSSL_PARAM known_settable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
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OSSL_PARAM_uint64(OSSL_KDF_PARAM_ITER, NULL),
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OSSL_PARAM_int(OSSL_KDF_PARAM_PKCS5, NULL),
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OSSL_PARAM_END
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};
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return known_settable_ctx_params;
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}
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static int kdf_pbkdf2_get_ctx_params(void *vctx, OSSL_PARAM params[])
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{
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OSSL_PARAM *p;
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if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
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return OSSL_PARAM_set_size_t(p, SIZE_MAX);
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return -2;
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}
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static const OSSL_PARAM *kdf_pbkdf2_gettable_ctx_params(ossl_unused void *ctx,
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ossl_unused void *p_ctx)
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{
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
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OSSL_PARAM_END
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};
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return known_gettable_ctx_params;
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}
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const OSSL_DISPATCH ossl_kdf_pbkdf2_functions[] = {
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{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pbkdf2_new },
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{ OSSL_FUNC_KDF_DUPCTX, (void(*)(void))kdf_pbkdf2_dup },
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{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pbkdf2_free },
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{ OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pbkdf2_reset },
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{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pbkdf2_derive },
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{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
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(void(*)(void))kdf_pbkdf2_settable_ctx_params },
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{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_set_ctx_params },
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{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
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(void(*)(void))kdf_pbkdf2_gettable_ctx_params },
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{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pbkdf2_get_ctx_params },
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OSSL_DISPATCH_END
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};
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/*
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* This is an implementation of PKCS#5 v2.0 password based encryption key
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* derivation function PBKDF2. SHA1 version verified against test vectors
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* posted by Peter Gutmann to the PKCS-TNG mailing list.
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*
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* The constraints specified by SP800-132 have been added i.e.
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* - Check the range of the key length.
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* - Minimum iteration count of 1000.
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* - Randomly-generated portion of the salt shall be at least 128 bits.
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*/
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static int pbkdf2_derive(const char *pass, size_t passlen,
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const unsigned char *salt, int saltlen, uint64_t iter,
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const EVP_MD *digest, unsigned char *key,
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size_t keylen, int lower_bound_checks)
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{
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int ret = 0;
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unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
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int cplen, k, tkeylen, mdlen;
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uint64_t j;
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unsigned long i = 1;
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HMAC_CTX *hctx_tpl = NULL, *hctx = NULL;
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mdlen = EVP_MD_get_size(digest);
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if (mdlen <= 0)
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return 0;
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/*
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* This check should always be done because keylen / mdlen >= (2^32 - 1)
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* results in an overflow of the loop counter 'i'.
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*/
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if ((keylen / mdlen) >= KDF_PBKDF2_MAX_KEY_LEN_DIGEST_RATIO) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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if (lower_bound_checks) {
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if ((keylen * 8) < KDF_PBKDF2_MIN_KEY_LEN_BITS) {
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ERR_raise(ERR_LIB_PROV, PROV_R_KEY_SIZE_TOO_SMALL);
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return 0;
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}
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if (saltlen < KDF_PBKDF2_MIN_SALT_LEN) {
|
||
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SALT_LENGTH);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (iter < KDF_PBKDF2_MIN_ITERATIONS) {
|
||
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_ITERATION_COUNT);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
hctx_tpl = HMAC_CTX_new();
|
||
|
|
if (hctx_tpl == NULL)
|
||
|
|
return 0;
|
||
|
|
p = key;
|
||
|
|
tkeylen = keylen;
|
||
|
|
if (!HMAC_Init_ex(hctx_tpl, pass, passlen, digest, NULL))
|
||
|
|
goto err;
|
||
|
|
hctx = HMAC_CTX_new();
|
||
|
|
if (hctx == NULL)
|
||
|
|
goto err;
|
||
|
|
while (tkeylen) {
|
||
|
|
if (tkeylen > mdlen)
|
||
|
|
cplen = mdlen;
|
||
|
|
else
|
||
|
|
cplen = tkeylen;
|
||
|
|
/*
|
||
|
|
* We are unlikely to ever use more than 256 blocks (5120 bits!) but
|
||
|
|
* just in case...
|
||
|
|
*/
|
||
|
|
itmp[0] = (unsigned char)((i >> 24) & 0xff);
|
||
|
|
itmp[1] = (unsigned char)((i >> 16) & 0xff);
|
||
|
|
itmp[2] = (unsigned char)((i >> 8) & 0xff);
|
||
|
|
itmp[3] = (unsigned char)(i & 0xff);
|
||
|
|
if (!HMAC_CTX_copy(hctx, hctx_tpl))
|
||
|
|
goto err;
|
||
|
|
if (!HMAC_Update(hctx, salt, saltlen)
|
||
|
|
|| !HMAC_Update(hctx, itmp, 4)
|
||
|
|
|| !HMAC_Final(hctx, digtmp, NULL))
|
||
|
|
goto err;
|
||
|
|
memcpy(p, digtmp, cplen);
|
||
|
|
for (j = 1; j < iter; j++) {
|
||
|
|
if (!HMAC_CTX_copy(hctx, hctx_tpl))
|
||
|
|
goto err;
|
||
|
|
if (!HMAC_Update(hctx, digtmp, mdlen)
|
||
|
|
|| !HMAC_Final(hctx, digtmp, NULL))
|
||
|
|
goto err;
|
||
|
|
for (k = 0; k < cplen; k++)
|
||
|
|
p[k] ^= digtmp[k];
|
||
|
|
}
|
||
|
|
tkeylen -= cplen;
|
||
|
|
i++;
|
||
|
|
p += cplen;
|
||
|
|
}
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
HMAC_CTX_free(hctx);
|
||
|
|
HMAC_CTX_free(hctx_tpl);
|
||
|
|
return ret;
|
||
|
|
}
|