260 lines
8.2 KiB
C
260 lines
8.2 KiB
C
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/*
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* Copyright 2022-2023 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 <stdlib.h>
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#include <string.h>
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/kdf.h>
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#include <openssl/proverr.h>
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#include <openssl/core_names.h>
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#include "prov/providercommon.h"
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#include "prov/implementations.h"
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#include "prov/hmac_drbg.h"
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#include "prov/provider_ctx.h"
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static OSSL_FUNC_kdf_newctx_fn hmac_drbg_kdf_new;
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static OSSL_FUNC_kdf_dupctx_fn hmac_drbg_kdf_dup;
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static OSSL_FUNC_kdf_freectx_fn hmac_drbg_kdf_free;
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static OSSL_FUNC_kdf_reset_fn hmac_drbg_kdf_reset;
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static OSSL_FUNC_kdf_derive_fn hmac_drbg_kdf_derive;
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static OSSL_FUNC_kdf_settable_ctx_params_fn hmac_drbg_kdf_settable_ctx_params;
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static OSSL_FUNC_kdf_set_ctx_params_fn hmac_drbg_kdf_set_ctx_params;
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static OSSL_FUNC_kdf_gettable_ctx_params_fn hmac_drbg_kdf_gettable_ctx_params;
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static OSSL_FUNC_kdf_get_ctx_params_fn hmac_drbg_kdf_get_ctx_params;
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typedef struct {
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PROV_DRBG_HMAC base;
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void *provctx;
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unsigned char *entropy, *nonce;
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size_t entropylen, noncelen;
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int init;
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} KDF_HMAC_DRBG;
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static void *hmac_drbg_kdf_new(void *provctx)
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{
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KDF_HMAC_DRBG *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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ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ctx->provctx = provctx;
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return ctx;
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}
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static void hmac_drbg_kdf_reset(void *vctx)
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{
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KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx;
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PROV_DRBG_HMAC *drbg = &ctx->base;
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void *provctx = ctx->provctx;
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EVP_MAC_CTX_free(drbg->ctx);
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ossl_prov_digest_reset(&drbg->digest);
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OPENSSL_clear_free(ctx->entropy, ctx->entropylen);
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OPENSSL_clear_free(ctx->nonce, ctx->noncelen);
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OPENSSL_cleanse(ctx, sizeof(*ctx));
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ctx->provctx = provctx;
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}
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static void hmac_drbg_kdf_free(void *vctx)
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{
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KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx;
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if (ctx != NULL) {
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hmac_drbg_kdf_reset(ctx);
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OPENSSL_free(ctx);
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}
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}
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static int ossl_drbg_hmac_dup(PROV_DRBG_HMAC *dst, const PROV_DRBG_HMAC *src) {
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if (src->ctx != NULL) {
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dst->ctx = EVP_MAC_CTX_dup(src->ctx);
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if (dst->ctx == NULL)
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return 0;
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}
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if (!ossl_prov_digest_copy(&dst->digest, &src->digest))
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return 0;
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memcpy(dst->K, src->K, sizeof(dst->K));
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memcpy(dst->V, src->V, sizeof(dst->V));
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dst->blocklen = src->blocklen;
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return 1;
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}
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static void *hmac_drbg_kdf_dup(void *vctx)
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{
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const KDF_HMAC_DRBG *src = (const KDF_HMAC_DRBG *)vctx;
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KDF_HMAC_DRBG *dst;
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dst = hmac_drbg_kdf_new(src->provctx);
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if (dst != NULL) {
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if (!ossl_drbg_hmac_dup(&dst->base, &src->base)
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|| !ossl_prov_memdup(src->entropy, src->entropylen,
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&dst->entropy , &dst->entropylen)
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|| !ossl_prov_memdup(src->nonce, src->noncelen,
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&dst->nonce, &dst->noncelen))
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goto err;
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dst->init = src->init;
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}
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return dst;
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err:
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hmac_drbg_kdf_free(dst);
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return NULL;
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}
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static int hmac_drbg_kdf_derive(void *vctx, unsigned char *out, size_t outlen,
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const OSSL_PARAM params[])
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{
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KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx;
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PROV_DRBG_HMAC *drbg = &ctx->base;
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if (!ossl_prov_is_running()
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|| !hmac_drbg_kdf_set_ctx_params(vctx, params))
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return 0;
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if (!ctx->init) {
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if (ctx->entropy == NULL
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|| ctx->entropylen == 0
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|| ctx->nonce == NULL
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|| ctx->noncelen == 0
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|| !ossl_drbg_hmac_init(drbg, ctx->entropy, ctx->entropylen,
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ctx->nonce, ctx->noncelen, NULL, 0))
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return 0;
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ctx->init = 1;
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}
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return ossl_drbg_hmac_generate(drbg, out, outlen, NULL, 0);
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}
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static int hmac_drbg_kdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
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{
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KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx;
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PROV_DRBG_HMAC *drbg = &hmac->base;
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const char *name;
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const EVP_MD *md;
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_MAC);
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if (p != NULL) {
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if (drbg->ctx == NULL)
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return 0;
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name = EVP_MAC_get0_name(EVP_MAC_CTX_get0_mac(drbg->ctx));
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if (!OSSL_PARAM_set_utf8_string(p, name))
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_DIGEST);
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if (p != NULL) {
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md = ossl_prov_digest_md(&drbg->digest);
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if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_get0_name(md)))
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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 const OSSL_PARAM *hmac_drbg_kdf_gettable_ctx_params(
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ossl_unused void *vctx, 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_utf8_string(OSSL_KDF_PARAM_MAC, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
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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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static int hmac_drbg_kdf_set_ctx_params(void *vctx,
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const OSSL_PARAM params[])
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{
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KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx;
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PROV_DRBG_HMAC *drbg = &hmac->base;
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OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(hmac->provctx);
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const EVP_MD *md;
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const OSSL_PARAM *p;
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void *ptr = NULL;
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size_t size = 0;
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if (params == NULL)
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return 1;
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_ENTROPY);
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if (p != NULL) {
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if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size))
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return 0;
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OPENSSL_free(hmac->entropy);
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hmac->entropy = ptr;
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hmac->entropylen = size;
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hmac->init = 0;
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ptr = NULL;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_NONCE);
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if (p != NULL) {
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if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size))
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return 0;
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OPENSSL_free(hmac->nonce);
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hmac->nonce = ptr;
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hmac->noncelen = size;
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hmac->init = 0;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_ALG_PARAM_DIGEST);
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if (p != NULL) {
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if (!ossl_prov_digest_load_from_params(&drbg->digest, params, libctx))
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return 0;
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/* Confirm digest is allowed. Allow all digests that are not XOF */
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md = ossl_prov_digest_md(&drbg->digest);
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if (md != NULL) {
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if ((EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF) != 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
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return 0;
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}
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drbg->blocklen = EVP_MD_get_size(md);
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}
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return ossl_prov_macctx_load_from_params(&drbg->ctx, params,
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"HMAC", NULL, NULL, libctx);
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}
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return 1;
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}
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static const OSSL_PARAM *hmac_drbg_kdf_settable_ctx_params(
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ossl_unused void *vctx, 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_octet_string(OSSL_KDF_PARAM_HMACDRBG_ENTROPY, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_HMACDRBG_NONCE, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
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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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const OSSL_DISPATCH ossl_kdf_hmac_drbg_functions[] = {
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{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))hmac_drbg_kdf_new },
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{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))hmac_drbg_kdf_free },
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{ OSSL_FUNC_KDF_DUPCTX, (void(*)(void))hmac_drbg_kdf_dup },
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{ OSSL_FUNC_KDF_RESET, (void(*)(void))hmac_drbg_kdf_reset },
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{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))hmac_drbg_kdf_derive },
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{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
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(void(*)(void))hmac_drbg_kdf_settable_ctx_params },
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{ OSSL_FUNC_KDF_SET_CTX_PARAMS,
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(void(*)(void))hmac_drbg_kdf_set_ctx_params },
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{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
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(void(*)(void))hmac_drbg_kdf_gettable_ctx_params },
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{ OSSL_FUNC_KDF_GET_CTX_PARAMS,
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(void(*)(void))hmac_drbg_kdf_get_ctx_params },
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OSSL_DISPATCH_END
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};
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