2018-07-24 09:16:38 +08:00
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/*
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2020-04-23 20:55:52 +08:00
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* Copyright 2011-2020 The OpenSSL Project Authors. All Rights Reserved.
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2018-07-24 09:16:38 +08:00
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*
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2018-12-06 20:52:15 +08:00
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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2018-07-24 09:16:38 +08:00
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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/rand.h>
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2020-05-08 08:25:19 +08:00
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#include "prov/provider_util.h"
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2018-07-24 09:16:38 +08:00
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#include "internal/thread_once.h"
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2019-10-04 21:25:59 +08:00
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#include "prov/providercommon.h"
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2020-05-08 08:25:19 +08:00
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#include "prov/providercommonerr.h"
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "drbg_local.h"
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static OSSL_OP_rand_newctx_fn drbg_hmac_new_wrapper;
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static OSSL_OP_rand_freectx_fn drbg_hmac_free;
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static OSSL_OP_rand_instantiate_fn drbg_hmac_instantiate_wrapper;
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static OSSL_OP_rand_uninstantiate_fn drbg_hmac_uninstantiate_wrapper;
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static OSSL_OP_rand_generate_fn drbg_hmac_generate_wrapper;
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static OSSL_OP_rand_reseed_fn drbg_hmac_reseed_wrapper;
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static OSSL_OP_rand_settable_ctx_params_fn drbg_hmac_settable_ctx_params;
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static OSSL_OP_rand_set_ctx_params_fn drbg_hmac_set_ctx_params;
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static OSSL_OP_rand_gettable_ctx_params_fn drbg_hmac_gettable_ctx_params;
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static OSSL_OP_rand_get_ctx_params_fn drbg_hmac_get_ctx_params;
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static OSSL_OP_rand_verify_zeroization_fn drbg_hmac_verify_zeroization;
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typedef struct rand_drbg_hmac_st {
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EVP_MAC_CTX *ctx; /* H(x) = HMAC_hash OR H(x) = KMAC */
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PROV_DIGEST digest; /* H(x) = hash(x) */
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size_t blocklen;
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unsigned char K[EVP_MAX_MD_SIZE];
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unsigned char V[EVP_MAX_MD_SIZE];
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} PROV_DRBG_HMAC;
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2018-07-24 09:16:38 +08:00
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/*
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* Called twice by SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process.
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*
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* hmac is an object that holds the input/output Key and Value (K and V).
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* inbyte is 0x00 on the first call and 0x01 on the second call.
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* in1, in2, in3 are optional inputs that can be NULL.
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* in1len, in2len, in3len are the lengths of the input buffers.
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*
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* The returned K,V is:
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* hmac->K = HMAC(hmac->K, hmac->V || inbyte || [in1] || [in2] || [in3])
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* hmac->V = HMAC(hmac->K, hmac->V)
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*
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* Returns zero if an error occurs otherwise it returns 1.
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*/
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2020-05-08 08:25:19 +08:00
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static int do_hmac(PROV_DRBG_HMAC *hmac, unsigned char inbyte,
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2018-07-24 09:16:38 +08:00
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const unsigned char *in1, size_t in1len,
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const unsigned char *in2, size_t in2len,
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const unsigned char *in3, size_t in3len)
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{
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EVP_MAC_CTX *ctx = hmac->ctx;
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OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
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*params = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, hmac->K,
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hmac->blocklen);
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if (!EVP_MAC_set_ctx_params(ctx, params)
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|| !EVP_MAC_init(ctx)
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/* K = HMAC(K, V || inbyte || [in1] || [in2] || [in3]) */
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|| !EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
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|| !EVP_MAC_update(ctx, &inbyte, 1)
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|| !(in1 == NULL || in1len == 0 || EVP_MAC_update(ctx, in1, in1len))
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|| !(in2 == NULL || in2len == 0 || EVP_MAC_update(ctx, in2, in2len))
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|| !(in3 == NULL || in3len == 0 || EVP_MAC_update(ctx, in3, in3len))
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|| !EVP_MAC_final(ctx, hmac->K, NULL, sizeof(hmac->K)))
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return 0;
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/* V = HMAC(K, V) */
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*params = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY, hmac->K,
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hmac->blocklen);
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return EVP_MAC_set_ctx_params(ctx, params)
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&& EVP_MAC_init(ctx)
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&& EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
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&& EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V));
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2018-07-24 09:16:38 +08:00
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}
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/*
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* SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process
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*
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*
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* Updates the drbg objects Key(K) and Value(V) using the following algorithm:
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* K,V = do_hmac(hmac, 0, in1, in2, in3)
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* if (any input is not NULL)
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* K,V = do_hmac(hmac, 1, in1, in2, in3)
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*
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* where in1, in2, in3 are optional input buffers that can be NULL.
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* in1len, in2len, in3len are the lengths of the input buffers.
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*
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* Returns zero if an error occurs otherwise it returns 1.
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*/
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_update(PROV_DRBG *drbg,
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2018-07-24 09:16:38 +08:00
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const unsigned char *in1, size_t in1len,
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const unsigned char *in2, size_t in2len,
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const unsigned char *in3, size_t in3len)
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{
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2020-05-08 08:25:19 +08:00
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PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
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2018-07-24 09:16:38 +08:00
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/* (Steps 1-2) K = HMAC(K, V||0x00||provided_data). V = HMAC(K,V) */
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if (!do_hmac(hmac, 0x00, in1, in1len, in2, in2len, in3, in3len))
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return 0;
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/* (Step 3) If provided_data == NULL then return (K,V) */
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if (in1len == 0 && in2len == 0 && in3len == 0)
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return 1;
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/* (Steps 4-5) K = HMAC(K, V||0x01||provided_data). V = HMAC(K,V) */
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return do_hmac(hmac, 0x01, in1, in1len, in2, in2len, in3, in3len);
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}
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/*
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* SP800-90Ar1 10.1.2.3 HMAC_DRBG_Instantiate_Process:
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*
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* This sets the drbg Key (K) to all zeros, and Value (V) to all 1's.
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* and then calls (K,V) = drbg_hmac_update() with input parameters:
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* ent = entropy data (Can be NULL) of length ent_len.
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* nonce = nonce data (Can be NULL) of length nonce_len.
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* pstr = personalization data (Can be NULL) of length pstr_len.
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*
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* Returns zero if an error occurs otherwise it returns 1.
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*/
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_instantiate(PROV_DRBG *drbg,
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2018-07-24 09:16:38 +08:00
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const unsigned char *ent, size_t ent_len,
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const unsigned char *nonce, size_t nonce_len,
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const unsigned char *pstr, size_t pstr_len)
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{
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2020-05-08 08:25:19 +08:00
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PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
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if (hmac->ctx == NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC);
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return 0;
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}
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2018-07-24 09:16:38 +08:00
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/* (Step 2) Key = 0x00 00...00 */
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memset(hmac->K, 0x00, hmac->blocklen);
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/* (Step 3) V = 0x01 01...01 */
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memset(hmac->V, 0x01, hmac->blocklen);
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/* (Step 4) (K,V) = HMAC_DRBG_Update(entropy||nonce||pers string, K, V) */
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return drbg_hmac_update(drbg, ent, ent_len, nonce, nonce_len, pstr,
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pstr_len);
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}
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_instantiate_wrapper(void *vdrbg, unsigned int strength,
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int prediction_resistance,
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const unsigned char *pstr,
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size_t pstr_len)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_instantiate(drbg, strength, prediction_resistance,
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pstr, pstr_len);
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}
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2018-07-24 09:16:38 +08:00
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/*
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* SP800-90Ar1 10.1.2.4 HMAC_DRBG_Reseed_Process:
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*
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* Reseeds the drbg's Key (K) and Value (V) by calling
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* (K,V) = drbg_hmac_update() with the following input parameters:
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* ent = entropy input data (Can be NULL) of length ent_len.
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* adin = additional input data (Can be NULL) of length adin_len.
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*
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* Returns zero if an error occurs otherwise it returns 1.
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*/
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_reseed(PROV_DRBG *drbg,
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2018-07-24 09:16:38 +08:00
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const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adin_len)
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{
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/* (Step 2) (K,V) = HMAC_DRBG_Update(entropy||additional_input, K, V) */
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return drbg_hmac_update(drbg, ent, ent_len, adin, adin_len, NULL, 0);
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}
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_reseed_wrapper(void *vdrbg, int prediction_resistance,
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const unsigned char *ent, size_t ent_len,
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const unsigned char *adin, size_t adin_len)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_reseed(drbg, prediction_resistance, ent, ent_len,
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adin, adin_len);
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}
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2018-07-24 09:16:38 +08:00
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/*
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* SP800-90Ar1 10.1.2.5 HMAC_DRBG_Generate_Process:
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*
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* Generates pseudo random bytes and updates the internal K,V for the drbg.
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* out is a buffer to fill with outlen bytes of pseudo random data.
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* adin is an additional_input string of size adin_len that may be NULL.
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*
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* Returns zero if an error occurs otherwise it returns 1.
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*/
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_generate(PROV_DRBG *drbg,
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2018-07-24 09:16:38 +08:00
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unsigned char *out, size_t outlen,
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const unsigned char *adin, size_t adin_len)
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{
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2020-05-08 08:25:19 +08:00
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PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
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EVP_MAC_CTX *ctx = hmac->ctx;
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2018-07-24 09:16:38 +08:00
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const unsigned char *temp = hmac->V;
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2020-05-08 08:25:19 +08:00
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OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
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2018-07-24 09:16:38 +08:00
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/* (Step 2) if adin != NULL then (K,V) = HMAC_DRBG_Update(adin, K, V) */
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if (adin != NULL
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&& adin_len > 0
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&& !drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
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return 0;
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/*
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* (Steps 3-5) temp = NULL
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* while (len(temp) < outlen) {
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* V = HMAC(K, V)
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* temp = temp || V
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* }
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*/
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for (;;) {
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2020-05-08 08:25:19 +08:00
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*params = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
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hmac->K, hmac->blocklen);
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if (!EVP_MAC_set_ctx_params(ctx, params)
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|| !EVP_MAC_init(ctx)
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|| !EVP_MAC_update(ctx, temp, hmac->blocklen))
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2018-07-24 09:16:38 +08:00
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return 0;
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if (outlen > hmac->blocklen) {
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2020-05-08 08:25:19 +08:00
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if (!EVP_MAC_final(ctx, out, NULL, outlen))
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2018-07-24 09:16:38 +08:00
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return 0;
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temp = out;
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} else {
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2020-05-08 08:25:19 +08:00
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if (!EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V)))
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2018-07-24 09:16:38 +08:00
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return 0;
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memcpy(out, hmac->V, outlen);
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break;
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}
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out += hmac->blocklen;
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outlen -= hmac->blocklen;
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}
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/* (Step 6) (K,V) = HMAC_DRBG_Update(adin, K, V) */
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if (!drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
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return 0;
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return 1;
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}
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_generate_wrapper
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(void *vdrbg, unsigned char *out, size_t outlen, unsigned int strength,
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int prediction_resistance, const unsigned char *adin, size_t adin_len)
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2018-07-24 09:16:38 +08:00
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{
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2020-05-08 08:25:19 +08:00
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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return PROV_DRBG_generate(drbg, out, outlen, strength,
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prediction_resistance, adin, adin_len);
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2018-07-24 09:16:38 +08:00
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}
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_uninstantiate(PROV_DRBG *drbg)
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{
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PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
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2018-07-24 09:16:38 +08:00
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2020-05-08 08:25:19 +08:00
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OPENSSL_cleanse(hmac->K, sizeof(hmac->K));
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OPENSSL_cleanse(hmac->V, sizeof(hmac->V));
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return PROV_DRBG_uninstantiate(drbg);
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}
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static int drbg_hmac_uninstantiate_wrapper(void *vdrbg)
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2018-07-24 09:16:38 +08:00
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{
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2020-05-08 08:25:19 +08:00
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return drbg_hmac_uninstantiate((PROV_DRBG *)vdrbg);
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}
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2018-07-24 09:16:38 +08:00
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_verify_zeroization(void *vdrbg)
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{
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PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
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PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
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2018-07-24 09:16:38 +08:00
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2020-05-08 08:25:19 +08:00
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PROV_DRBG_VERYIFY_ZEROIZATION(hmac->K);
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PROV_DRBG_VERYIFY_ZEROIZATION(hmac->V);
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return 1;
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}
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2019-11-01 19:07:08 +08:00
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2020-05-08 08:25:19 +08:00
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static int drbg_hmac_new(PROV_DRBG *drbg)
|
|
|
|
{
|
|
|
|
PROV_DRBG_HMAC *hmac;
|
2018-07-24 09:16:38 +08:00
|
|
|
|
2020-05-08 08:25:19 +08:00
|
|
|
hmac = OPENSSL_secure_zalloc(sizeof(*hmac));
|
|
|
|
if (hmac == NULL) {
|
|
|
|
ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
|
|
|
|
return 0;
|
2018-07-24 09:16:38 +08:00
|
|
|
}
|
|
|
|
|
2020-05-08 08:25:19 +08:00
|
|
|
drbg->data = hmac;
|
2018-07-24 09:16:38 +08:00
|
|
|
/* See SP800-57 Part1 Rev4 5.6.1 Table 3 */
|
2018-10-10 07:53:29 +08:00
|
|
|
drbg->max_entropylen = DRBG_MAX_LENGTH;
|
|
|
|
drbg->max_noncelen = DRBG_MAX_LENGTH;
|
2018-07-24 09:16:38 +08:00
|
|
|
drbg->max_perslen = DRBG_MAX_LENGTH;
|
|
|
|
drbg->max_adinlen = DRBG_MAX_LENGTH;
|
|
|
|
|
2020-05-08 08:25:19 +08:00
|
|
|
/* Maximum number of bits per request = 2^19 = 2^16 bytes */
|
2018-07-24 09:16:38 +08:00
|
|
|
drbg->max_request = 1 << 16;
|
|
|
|
return 1;
|
|
|
|
}
|
2020-05-08 08:25:19 +08:00
|
|
|
|
|
|
|
static void *drbg_hmac_new_wrapper(void *provctx, void *parent,
|
|
|
|
const OSSL_DISPATCH *parent_dispatch)
|
|
|
|
{
|
|
|
|
return prov_rand_drbg_new(provctx, parent, parent_dispatch, &drbg_hmac_new,
|
|
|
|
&drbg_hmac_instantiate, &drbg_hmac_uninstantiate,
|
|
|
|
&drbg_hmac_reseed, &drbg_hmac_generate);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void drbg_hmac_free(void *vdrbg)
|
|
|
|
{
|
|
|
|
PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
|
|
|
|
PROV_DRBG_HMAC *hmac;
|
|
|
|
|
|
|
|
if (drbg != NULL && (hmac = (PROV_DRBG_HMAC *)drbg->data) != NULL) {
|
|
|
|
EVP_MAC_free_ctx(hmac->ctx);
|
|
|
|
ossl_prov_digest_reset(&hmac->digest);
|
|
|
|
OPENSSL_secure_clear_free(hmac, sizeof(*hmac));
|
|
|
|
}
|
|
|
|
prov_rand_drbg_free(drbg);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int drbg_hmac_get_ctx_params(void *vdrbg, OSSL_PARAM params[])
|
|
|
|
{
|
|
|
|
PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
|
|
|
|
|
|
|
|
return drbg_get_ctx_params(drbg, params);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const OSSL_PARAM *drbg_hmac_gettable_ctx_params(void)
|
|
|
|
{
|
|
|
|
static const OSSL_PARAM known_gettable_ctx_params[] = {
|
|
|
|
OSSL_PARAM_DRBG_GETABLE_CTX_COMMON,
|
|
|
|
OSSL_PARAM_END
|
|
|
|
};
|
|
|
|
return known_gettable_ctx_params;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int drbg_hmac_set_ctx_params(void *vctx, const OSSL_PARAM params[])
|
|
|
|
{
|
|
|
|
PROV_DRBG *ctx = (PROV_DRBG *)vctx;
|
|
|
|
PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)ctx->data;
|
|
|
|
OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
|
|
|
|
const EVP_MD *md;
|
|
|
|
|
|
|
|
if (!ossl_prov_digest_load_from_params(&hmac->digest, params, libctx))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Confirm digest is allowed. We allow all digests that are not XOF
|
|
|
|
* (such as SHAKE). In FIPS mode, the fetch will fail for non-approved
|
|
|
|
* digests.
|
|
|
|
*/
|
|
|
|
md = ossl_prov_digest_md(&hmac->digest);
|
|
|
|
if (md != NULL && (EVP_MD_flags(md) & EVP_MD_FLAG_XOF) != 0) {
|
|
|
|
ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!ossl_prov_macctx_load_from_params(&hmac->ctx, params,
|
|
|
|
NULL, NULL, NULL, libctx))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (hmac->ctx != NULL) {
|
|
|
|
/* These are taken from SP 800-90 10.1 Table 2 */
|
|
|
|
hmac->blocklen = EVP_MD_size(md);
|
|
|
|
/* See SP800-57 Part1 Rev4 5.6.1 Table 3 */
|
|
|
|
ctx->strength = 64 * (int)(hmac->blocklen >> 3);
|
|
|
|
if (ctx->strength > 256)
|
|
|
|
ctx->strength = 256;
|
|
|
|
ctx->seedlen = hmac->blocklen;
|
|
|
|
ctx->min_entropylen = ctx->strength / 8;
|
|
|
|
ctx->min_noncelen = ctx->min_entropylen / 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
return drbg_set_ctx_params(ctx, params);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const OSSL_PARAM *drbg_hmac_settable_ctx_params(void)
|
|
|
|
{
|
|
|
|
static const OSSL_PARAM known_settable_ctx_params[] = {
|
|
|
|
OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0),
|
|
|
|
OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),
|
|
|
|
OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),
|
|
|
|
OSSL_PARAM_DRBG_SETABLE_CTX_COMMON,
|
|
|
|
OSSL_PARAM_END
|
|
|
|
};
|
|
|
|
return known_settable_ctx_params;
|
|
|
|
}
|
|
|
|
|
|
|
|
const OSSL_DISPATCH drbg_hmac_functions[] = {
|
|
|
|
{ OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_hmac_new_wrapper },
|
|
|
|
{ OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_hmac_free },
|
|
|
|
{ OSSL_FUNC_RAND_INSTANTIATE,
|
|
|
|
(void(*)(void))drbg_hmac_instantiate_wrapper },
|
|
|
|
{ OSSL_FUNC_RAND_UNINSTANTIATE,
|
|
|
|
(void(*)(void))drbg_hmac_uninstantiate_wrapper },
|
|
|
|
{ OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_hmac_generate_wrapper },
|
|
|
|
{ OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_hmac_reseed_wrapper },
|
|
|
|
{ OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))drbg_enable_locking },
|
|
|
|
{ OSSL_FUNC_RAND_LOCK, (void(*)(void))drbg_lock },
|
|
|
|
{ OSSL_FUNC_RAND_UNLOCK, (void(*)(void))drbg_unlock },
|
|
|
|
{ OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS,
|
|
|
|
(void(*)(void))drbg_hmac_settable_ctx_params },
|
|
|
|
{ OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_hmac_set_ctx_params },
|
|
|
|
{ OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
|
|
|
|
(void(*)(void))drbg_hmac_gettable_ctx_params },
|
|
|
|
{ OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_hmac_get_ctx_params },
|
|
|
|
{ OSSL_FUNC_RAND_SET_CALLBACKS, (void(*)(void))drbg_set_callbacks },
|
|
|
|
{ OSSL_FUNC_RAND_VERIFY_ZEROIZATION,
|
|
|
|
(void(*)(void))drbg_hmac_verify_zeroization },
|
|
|
|
{ 0, NULL }
|
|
|
|
};
|