[thirdparty/openssl.git] / providers / implementations / rands / drbg_hmac.c

/*
 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdlib.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/proverr.h>
#include "prov/provider_util.h"
#include "internal/thread_once.h"
#include "prov/providercommon.h"
#include "prov/implementations.h"
#include "prov/provider_ctx.h"
#include "drbg_local.h"

static OSSL_FUNC_rand_newctx_fn drbg_hmac_new_wrapper;
static OSSL_FUNC_rand_freectx_fn drbg_hmac_free;
static OSSL_FUNC_rand_instantiate_fn drbg_hmac_instantiate_wrapper;
static OSSL_FUNC_rand_uninstantiate_fn drbg_hmac_uninstantiate_wrapper;
static OSSL_FUNC_rand_generate_fn drbg_hmac_generate_wrapper;
static OSSL_FUNC_rand_reseed_fn drbg_hmac_reseed_wrapper;
static OSSL_FUNC_rand_settable_ctx_params_fn drbg_hmac_settable_ctx_params;
static OSSL_FUNC_rand_set_ctx_params_fn drbg_hmac_set_ctx_params;
static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_hmac_gettable_ctx_params;
static OSSL_FUNC_rand_get_ctx_params_fn drbg_hmac_get_ctx_params;
static OSSL_FUNC_rand_verify_zeroization_fn drbg_hmac_verify_zeroization;

typedef struct rand_drbg_hmac_st {
    EVP_MAC_CTX *ctx;            /* H(x) = HMAC_hash OR H(x) = KMAC */
    PROV_DIGEST digest;          /* H(x) = hash(x) */
    size_t blocklen;
    unsigned char K[EVP_MAX_MD_SIZE];
    unsigned char V[EVP_MAX_MD_SIZE];
} PROV_DRBG_HMAC;

/*
 * Called twice by SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process.
 *
 * hmac is an object that holds the input/output Key and Value (K and V).
 * inbyte is 0x00 on the first call and 0x01 on the second call.
 * in1, in2, in3 are optional inputs that can be NULL.
 * in1len, in2len, in3len are the lengths of the input buffers.
 *
 * The returned K,V is:
 *   hmac->K = HMAC(hmac->K, hmac->V || inbyte || [in1] || [in2] || [in3])
 *   hmac->V = HMAC(hmac->K, hmac->V)
 *
 * Returns zero if an error occurs otherwise it returns 1.
 */
static int do_hmac(PROV_DRBG_HMAC *hmac, unsigned char inbyte,
                   const unsigned char *in1, size_t in1len,
                   const unsigned char *in2, size_t in2len,
                   const unsigned char *in3, size_t in3len)
{
    EVP_MAC_CTX *ctx = hmac->ctx;

    if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
            /* K = HMAC(K, V || inbyte || [in1] || [in2] || [in3]) */
            || !EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
            || !EVP_MAC_update(ctx, &inbyte, 1)
            || !(in1 == NULL || in1len == 0 || EVP_MAC_update(ctx, in1, in1len))
            || !(in2 == NULL || in2len == 0 || EVP_MAC_update(ctx, in2, in2len))
            || !(in3 == NULL || in3len == 0 || EVP_MAC_update(ctx, in3, in3len))
            || !EVP_MAC_final(ctx, hmac->K, NULL, sizeof(hmac->K)))
        return 0;

   /* V = HMAC(K, V) */
    return EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
           && EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
           && EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V));
}

/*
 * SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process
 *
 *
 * Updates the drbg objects Key(K) and Value(V) using the following algorithm:
 *   K,V = do_hmac(hmac, 0, in1, in2, in3)
 *   if (any input is not NULL)
 *     K,V = do_hmac(hmac, 1, in1, in2, in3)
 *
 * where in1, in2, in3 are optional input buffers that can be NULL.
 *       in1len, in2len, in3len are the lengths of the input buffers.
 *
 * Returns zero if an error occurs otherwise it returns 1.
 */
static int drbg_hmac_update(PROV_DRBG *drbg,
                            const unsigned char *in1, size_t in1len,
                            const unsigned char *in2, size_t in2len,
                            const unsigned char *in3, size_t in3len)
{
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    /* (Steps 1-2) K = HMAC(K, V||0x00||provided_data). V = HMAC(K,V) */
    if (!do_hmac(hmac, 0x00, in1, in1len, in2, in2len, in3, in3len))
        return 0;
    /* (Step 3) If provided_data == NULL then return (K,V) */
    if (in1len == 0 && in2len == 0 && in3len == 0)
        return 1;
    /* (Steps 4-5) K = HMAC(K, V||0x01||provided_data). V = HMAC(K,V) */
    return do_hmac(hmac, 0x01, in1, in1len, in2, in2len, in3, in3len);
}

/*
 * SP800-90Ar1 10.1.2.3 HMAC_DRBG_Instantiate_Process:
 *
 * This sets the drbg Key (K) to all zeros, and Value (V) to all 1's.
 * and then calls (K,V) = drbg_hmac_update() with input parameters:
 *   ent = entropy data (Can be NULL) of length ent_len.
 *   nonce = nonce data (Can be NULL) of length nonce_len.
 *   pstr = personalization data (Can be NULL) of length pstr_len.
 *
 * Returns zero if an error occurs otherwise it returns 1.
 */
static int drbg_hmac_instantiate(PROV_DRBG *drbg,
                                 const unsigned char *ent, size_t ent_len,
                                 const unsigned char *nonce, size_t nonce_len,
                                 const unsigned char *pstr, size_t pstr_len)
{
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    if (hmac->ctx == NULL) {
        ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC);
        return 0;
    }

    /* (Step 2) Key = 0x00 00...00 */
    memset(hmac->K, 0x00, hmac->blocklen);
    /* (Step 3) V = 0x01 01...01 */
    memset(hmac->V, 0x01, hmac->blocklen);
    /* (Step 4) (K,V) = HMAC_DRBG_Update(entropy||nonce||pers string, K, V) */
    return drbg_hmac_update(drbg, ent, ent_len, nonce, nonce_len, pstr,
                            pstr_len);
}

static int drbg_hmac_instantiate_wrapper(void *vdrbg, unsigned int strength,
                                         int prediction_resistance,
                                         const unsigned char *pstr,
                                         size_t pstr_len)
{
    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    return ossl_prov_drbg_instantiate(drbg, strength, prediction_resistance,
                                      pstr, pstr_len);
}

/*
 * SP800-90Ar1 10.1.2.4 HMAC_DRBG_Reseed_Process:
 *
 * Reseeds the drbg's Key (K) and Value (V) by calling
 * (K,V) = drbg_hmac_update() with the following input parameters:
 *   ent = entropy input data (Can be NULL) of length ent_len.
 *   adin = additional input data (Can be NULL) of length adin_len.
 *
 * Returns zero if an error occurs otherwise it returns 1.
 */
static int drbg_hmac_reseed(PROV_DRBG *drbg,
                            const unsigned char *ent, size_t ent_len,
                            const unsigned char *adin, size_t adin_len)
{
    /* (Step 2) (K,V) = HMAC_DRBG_Update(entropy||additional_input, K, V) */
    return drbg_hmac_update(drbg, ent, ent_len, adin, adin_len, NULL, 0);
}

static int drbg_hmac_reseed_wrapper(void *vdrbg, int prediction_resistance,
                                    const unsigned char *ent, size_t ent_len,
                                    const unsigned char *adin, size_t adin_len)
{
    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    return ossl_prov_drbg_reseed(drbg, prediction_resistance, ent, ent_len,
                                 adin, adin_len);
}

/*
 * SP800-90Ar1 10.1.2.5 HMAC_DRBG_Generate_Process:
 *
 * Generates pseudo random bytes and updates the internal K,V for the drbg.
 * out is a buffer to fill with outlen bytes of pseudo random data.
 * adin is an additional_input string of size adin_len that may be NULL.
 *
 * Returns zero if an error occurs otherwise it returns 1.
 */
static int drbg_hmac_generate(PROV_DRBG *drbg,
                              unsigned char *out, size_t outlen,
                              const unsigned char *adin, size_t adin_len)
{
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
    EVP_MAC_CTX *ctx = hmac->ctx;
    const unsigned char *temp = hmac->V;

    /* (Step 2) if adin != NULL then (K,V) = HMAC_DRBG_Update(adin, K, V) */
    if (adin != NULL
            && adin_len > 0
            && !drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
        return 0;

    /*
     * (Steps 3-5) temp = NULL
     *             while (len(temp) < outlen) {
     *                 V = HMAC(K, V)
     *                 temp = temp || V
     *             }
     */
    for (;;) {
        if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
            || !EVP_MAC_update(ctx, temp, hmac->blocklen))
            return 0;

        if (outlen > hmac->blocklen) {
            if (!EVP_MAC_final(ctx, out, NULL, outlen))
                return 0;
            temp = out;
        } else {
            if (!EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V)))
                return 0;
            memcpy(out, hmac->V, outlen);
            break;
        }
        out += hmac->blocklen;
        outlen -= hmac->blocklen;
    }
    /* (Step 6) (K,V) = HMAC_DRBG_Update(adin, K, V) */
    if (!drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
        return 0;

    return 1;
}

static int drbg_hmac_generate_wrapper
    (void *vdrbg, unsigned char *out, size_t outlen, unsigned int strength,
     int prediction_resistance, const unsigned char *adin, size_t adin_len)
{
    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;

    return ossl_prov_drbg_generate(drbg, out, outlen, strength,
                                   prediction_resistance, adin, adin_len);
}

static int drbg_hmac_uninstantiate(PROV_DRBG *drbg)
{
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    OPENSSL_cleanse(hmac->K, sizeof(hmac->K));
    OPENSSL_cleanse(hmac->V, sizeof(hmac->V));
    return ossl_prov_drbg_uninstantiate(drbg);
}

static int drbg_hmac_uninstantiate_wrapper(void *vdrbg)
{
    return drbg_hmac_uninstantiate((PROV_DRBG *)vdrbg);
}

static int drbg_hmac_verify_zeroization(void *vdrbg)
{
    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;

    PROV_DRBG_VERYIFY_ZEROIZATION(hmac->K);
    PROV_DRBG_VERYIFY_ZEROIZATION(hmac->V);
    return 1;
}

static int drbg_hmac_new(PROV_DRBG *drbg)
{
    PROV_DRBG_HMAC *hmac;

    hmac = OPENSSL_secure_zalloc(sizeof(*hmac));
    if (hmac == NULL) {
        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    drbg->data = hmac;
    /* See SP800-57 Part1 Rev4 5.6.1 Table 3 */
    drbg->max_entropylen = DRBG_MAX_LENGTH;
    drbg->max_noncelen = DRBG_MAX_LENGTH;
    drbg->max_perslen = DRBG_MAX_LENGTH;
    drbg->max_adinlen = DRBG_MAX_LENGTH;

    /* Maximum number of bits per request = 2^19  = 2^16 bytes */
    drbg->max_request = 1 << 16;
    return 1;
}

static void *drbg_hmac_new_wrapper(void *provctx, void *parent,
                                   const OSSL_DISPATCH *parent_dispatch)
{
    return ossl_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_CTX_free(hmac->ctx);
        ossl_prov_digest_reset(&hmac->digest);
        OPENSSL_secure_clear_free(hmac, sizeof(*hmac));
    }
    ossl_rand_drbg_free(drbg);
}

static int drbg_hmac_get_ctx_params(void *vdrbg, OSSL_PARAM params[])
{
    PROV_DRBG *drbg = (PROV_DRBG *)vdrbg;
    PROV_DRBG_HMAC *hmac = (PROV_DRBG_HMAC *)drbg->data;
    const char *name;
    const EVP_MD *md;
    OSSL_PARAM *p;

    p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_MAC);
    if (p != NULL) {
        if (hmac->ctx == NULL)
            return 0;
        name = EVP_MAC_name(EVP_MAC_CTX_mac(hmac->ctx));
        if (!OSSL_PARAM_set_utf8_string(p, name))
            return 0;
    }

    p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_DIGEST);
    if (p != NULL) {
        md = ossl_prov_digest_md(&hmac->digest);
        if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_name(md)))
            return 0;
    }

    return ossl_drbg_get_ctx_params(drbg, params);
}

static const OSSL_PARAM *drbg_hmac_gettable_ctx_params(ossl_unused void *vctx,
                                                       ossl_unused void *p_ctx)
{
    static const OSSL_PARAM known_gettable_ctx_params[] = {
        OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),
        OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),
        OSSL_PARAM_DRBG_GETTABLE_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;
    OSSL_LIB_CTX *libctx = PROV_LIBCTX_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 ossl_drbg_set_ctx_params(ctx, params);
}

static const OSSL_PARAM *drbg_hmac_settable_ctx_params(ossl_unused void *vctx,
                                                       ossl_unused void *p_ctx)
{
    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_SETTABLE_CTX_COMMON,
        OSSL_PARAM_END
    };
    return known_settable_ctx_params;
}

const OSSL_DISPATCH ossl_drbg_ossl_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))ossl_drbg_enable_locking },
    { OSSL_FUNC_RAND_LOCK, (void(*)(void))ossl_drbg_lock },
    { OSSL_FUNC_RAND_UNLOCK, (void(*)(void))ossl_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_VERIFY_ZEROIZATION,
      (void(*)(void))drbg_hmac_verify_zeroization },
    { OSSL_FUNC_RAND_GET_SEED, (void(*)(void))ossl_drbg_get_seed },
    { OSSL_FUNC_RAND_CLEAR_SEED, (void(*)(void))ossl_drbg_clear_seed },
    { 0, NULL }
};
Commit	Line	Data
8bf36651	1	/*
a28d06f3	2	* Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
8bf36651	3	*
0db63de9	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
8bf36651 SL	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
	8	*/
	9
	10	#include <stdlib.h>
	11	#include <string.h>
	12	#include <openssl/crypto.h>
	13	#include <openssl/err.h>
	14	#include <openssl/rand.h>
2741128e	15	#include <openssl/proverr.h>
f000e828	16	#include "prov/provider_util.h"
8bf36651	17	#include "internal/thread_once.h"
ddd21319	18	#include "prov/providercommon.h"
f000e828 P	19	#include "prov/implementations.h"
	20	#include "prov/provider_ctx.h"
	21	#include "drbg_local.h"
	22
363b1e5d DMSP	23	static OSSL_FUNC_rand_newctx_fn drbg_hmac_new_wrapper;
	24	static OSSL_FUNC_rand_freectx_fn drbg_hmac_free;
	25	static OSSL_FUNC_rand_instantiate_fn drbg_hmac_instantiate_wrapper;
	26	static OSSL_FUNC_rand_uninstantiate_fn drbg_hmac_uninstantiate_wrapper;
	27	static OSSL_FUNC_rand_generate_fn drbg_hmac_generate_wrapper;
	28	static OSSL_FUNC_rand_reseed_fn drbg_hmac_reseed_wrapper;
	29	static OSSL_FUNC_rand_settable_ctx_params_fn drbg_hmac_settable_ctx_params;
	30	static OSSL_FUNC_rand_set_ctx_params_fn drbg_hmac_set_ctx_params;
	31	static OSSL_FUNC_rand_gettable_ctx_params_fn drbg_hmac_gettable_ctx_params;
	32	static OSSL_FUNC_rand_get_ctx_params_fn drbg_hmac_get_ctx_params;
	33	static OSSL_FUNC_rand_verify_zeroization_fn drbg_hmac_verify_zeroization;
f000e828 P	34
	35	typedef struct rand_drbg_hmac_st {
	36	EVP_MAC_CTX ctx; / H(x) = HMAC_hash OR H(x) = KMAC */
	37	PROV_DIGEST digest; /* H(x) = hash(x) */
	38	size_t blocklen;
	39	unsigned char K[EVP_MAX_MD_SIZE];
	40	unsigned char V[EVP_MAX_MD_SIZE];
	41	} PROV_DRBG_HMAC;
8bf36651 SL	42
	43	/*
	44	* Called twice by SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process.
	45	*
	46	* hmac is an object that holds the input/output Key and Value (K and V).
	47	* inbyte is 0x00 on the first call and 0x01 on the second call.
	48	* in1, in2, in3 are optional inputs that can be NULL.
	49	* in1len, in2len, in3len are the lengths of the input buffers.
	50	*
	51	* The returned K,V is:
	52	* hmac->K = HMAC(hmac->K, hmac->V \|\| inbyte \|\| [in1] \|\| [in2] \|\| [in3])
	53	* hmac->V = HMAC(hmac->K, hmac->V)
	54	*
	55	* Returns zero if an error occurs otherwise it returns 1.
	56	*/
f000e828	57	static int do_hmac(PROV_DRBG_HMAC *hmac, unsigned char inbyte,
8bf36651 SL	58	const unsigned char *in1, size_t in1len,
	59	const unsigned char *in2, size_t in2len,
	60	const unsigned char *in3, size_t in3len)
	61	{
f000e828	62	EVP_MAC_CTX *ctx = hmac->ctx;
f000e828	63
cf5784aa	64	if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
f000e828 P	65	/* K = HMAC(K, V \|\| inbyte \|\| [in1] \|\| [in2] \|\| [in3]) */
	66	\|\| !EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
	67	\|\| !EVP_MAC_update(ctx, &inbyte, 1)
	68	\|\| !(in1 == NULL \|\| in1len == 0 \|\| EVP_MAC_update(ctx, in1, in1len))
	69	\|\| !(in2 == NULL \|\| in2len == 0 \|\| EVP_MAC_update(ctx, in2, in2len))
	70	\|\| !(in3 == NULL \|\| in3len == 0 \|\| EVP_MAC_update(ctx, in3, in3len))
	71	\|\| !EVP_MAC_final(ctx, hmac->K, NULL, sizeof(hmac->K)))
	72	return 0;
	73
	74	/* V = HMAC(K, V) */
cf5784aa	75	return EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
f000e828 P	76	&& EVP_MAC_update(ctx, hmac->V, hmac->blocklen)
f000e828 P	77	&& EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V));
8bf36651 SL	78	}
	79
	80	/*
	81	* SP800-90Ar1 10.1.2.2 HMAC_DRBG_Update_Process
	82	*
	83	*
	84	* Updates the drbg objects Key(K) and Value(V) using the following algorithm:
	85	* K,V = do_hmac(hmac, 0, in1, in2, in3)
	86	* if (any input is not NULL)
	87	* K,V = do_hmac(hmac, 1, in1, in2, in3)
	88	*
	89	* where in1, in2, in3 are optional input buffers that can be NULL.
	90	* in1len, in2len, in3len are the lengths of the input buffers.
	91	*
	92	* Returns zero if an error occurs otherwise it returns 1.
	93	*/
f000e828	94	static int drbg_hmac_update(PROV_DRBG *drbg,
8bf36651 SL	95	const unsigned char *in1, size_t in1len,
	96	const unsigned char *in2, size_t in2len,
	97	const unsigned char *in3, size_t in3len)
	98	{
f000e828	99	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
8bf36651 SL	100
	101	/* (Steps 1-2) K = HMAC(K, V\|\|0x00\|\|provided_data). V = HMAC(K,V) */
	102	if (!do_hmac(hmac, 0x00, in1, in1len, in2, in2len, in3, in3len))
	103	return 0;
	104	/* (Step 3) If provided_data == NULL then return (K,V) */
	105	if (in1len == 0 && in2len == 0 && in3len == 0)
	106	return 1;
	107	/* (Steps 4-5) K = HMAC(K, V\|\|0x01\|\|provided_data). V = HMAC(K,V) */
	108	return do_hmac(hmac, 0x01, in1, in1len, in2, in2len, in3, in3len);
	109	}
	110
	111	/*
	112	* SP800-90Ar1 10.1.2.3 HMAC_DRBG_Instantiate_Process:
	113	*
	114	* This sets the drbg Key (K) to all zeros, and Value (V) to all 1's.
	115	* and then calls (K,V) = drbg_hmac_update() with input parameters:
	116	* ent = entropy data (Can be NULL) of length ent_len.
	117	* nonce = nonce data (Can be NULL) of length nonce_len.
	118	* pstr = personalization data (Can be NULL) of length pstr_len.
	119	*
	120	* Returns zero if an error occurs otherwise it returns 1.
	121	*/
f000e828	122	static int drbg_hmac_instantiate(PROV_DRBG *drbg,
8bf36651 SL	123	const unsigned char *ent, size_t ent_len,
	124	const unsigned char *nonce, size_t nonce_len,
	125	const unsigned char *pstr, size_t pstr_len)
	126	{
f000e828 P	127	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
	128
	129	if (hmac->ctx == NULL) {
	130	ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MAC);
	131	return 0;
	132	}
8bf36651 SL	133
	134	/* (Step 2) Key = 0x00 00...00 */
	135	memset(hmac->K, 0x00, hmac->blocklen);
	136	/* (Step 3) V = 0x01 01...01 */
	137	memset(hmac->V, 0x01, hmac->blocklen);
	138	/* (Step 4) (K,V) = HMAC_DRBG_Update(entropy\|\|nonce\|\|pers string, K, V) */
	139	return drbg_hmac_update(drbg, ent, ent_len, nonce, nonce_len, pstr,
	140	pstr_len);
	141	}
	142
f000e828 P	143	static int drbg_hmac_instantiate_wrapper(void *vdrbg, unsigned int strength,
	144	int prediction_resistance,
	145	const unsigned char *pstr,
	146	size_t pstr_len)
	147	{
	148	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
	149
7d6766cb P	150	return ossl_prov_drbg_instantiate(drbg, strength, prediction_resistance,
7d6766cb P	151	pstr, pstr_len);
f000e828 P	152	}
f000e828 P	153
8bf36651 SL	154	/*
	155	* SP800-90Ar1 10.1.2.4 HMAC_DRBG_Reseed_Process:
	156	*
	157	* Reseeds the drbg's Key (K) and Value (V) by calling
	158	* (K,V) = drbg_hmac_update() with the following input parameters:
	159	* ent = entropy input data (Can be NULL) of length ent_len.
	160	* adin = additional input data (Can be NULL) of length adin_len.
	161	*
	162	* Returns zero if an error occurs otherwise it returns 1.
	163	*/
f000e828	164	static int drbg_hmac_reseed(PROV_DRBG *drbg,
8bf36651 SL	165	const unsigned char *ent, size_t ent_len,
	166	const unsigned char *adin, size_t adin_len)
	167	{
	168	/* (Step 2) (K,V) = HMAC_DRBG_Update(entropy\|\|additional_input, K, V) */
	169	return drbg_hmac_update(drbg, ent, ent_len, adin, adin_len, NULL, 0);
	170	}
	171
f000e828 P	172	static int drbg_hmac_reseed_wrapper(void *vdrbg, int prediction_resistance,
	173	const unsigned char *ent, size_t ent_len,
	174	const unsigned char *adin, size_t adin_len)
	175	{
	176	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
	177
7d6766cb P	178	return ossl_prov_drbg_reseed(drbg, prediction_resistance, ent, ent_len,
7d6766cb P	179	adin, adin_len);
f000e828 P	180	}
f000e828 P	181
8bf36651 SL	182	/*
	183	* SP800-90Ar1 10.1.2.5 HMAC_DRBG_Generate_Process:
	184	*
	185	* Generates pseudo random bytes and updates the internal K,V for the drbg.
	186	* out is a buffer to fill with outlen bytes of pseudo random data.
	187	* adin is an additional_input string of size adin_len that may be NULL.
	188	*
	189	* Returns zero if an error occurs otherwise it returns 1.
	190	*/
f000e828	191	static int drbg_hmac_generate(PROV_DRBG *drbg,
8bf36651 SL	192	unsigned char *out, size_t outlen,
	193	const unsigned char *adin, size_t adin_len)
	194	{
f000e828 P	195	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
f000e828 P	196	EVP_MAC_CTX *ctx = hmac->ctx;
8bf36651 SL	197	const unsigned char *temp = hmac->V;
	198
	199	/* (Step 2) if adin != NULL then (K,V) = HMAC_DRBG_Update(adin, K, V) */
	200	if (adin != NULL
	201	&& adin_len > 0
	202	&& !drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
	203	return 0;
	204
	205	/*
	206	* (Steps 3-5) temp = NULL
	207	* while (len(temp) < outlen) {
	208	* V = HMAC(K, V)
	209	* temp = temp \|\| V
	210	* }
	211	*/
	212	for (;;) {
cf5784aa	213	if (!EVP_MAC_init(ctx, hmac->K, hmac->blocklen, NULL)
f000e828	214	\|\| !EVP_MAC_update(ctx, temp, hmac->blocklen))
8bf36651 SL	215	return 0;
	216
	217	if (outlen > hmac->blocklen) {
f000e828	218	if (!EVP_MAC_final(ctx, out, NULL, outlen))
8bf36651 SL	219	return 0;
	220	temp = out;
	221	} else {
f000e828	222	if (!EVP_MAC_final(ctx, hmac->V, NULL, sizeof(hmac->V)))
8bf36651 SL	223	return 0;
	224	memcpy(out, hmac->V, outlen);
	225	break;
	226	}
	227	out += hmac->blocklen;
	228	outlen -= hmac->blocklen;
	229	}
	230	/* (Step 6) (K,V) = HMAC_DRBG_Update(adin, K, V) */
	231	if (!drbg_hmac_update(drbg, adin, adin_len, NULL, 0, NULL, 0))
	232	return 0;
	233
	234	return 1;
	235	}
	236
f000e828 P	237	static int drbg_hmac_generate_wrapper
	238	(void vdrbg, unsigned char out, size_t outlen, unsigned int strength,
	239	int prediction_resistance, const unsigned char *adin, size_t adin_len)
8bf36651	240	{
f000e828 P	241	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
f000e828 P	242
7d6766cb P	243	return ossl_prov_drbg_generate(drbg, out, outlen, strength,
7d6766cb P	244	prediction_resistance, adin, adin_len);
8bf36651 SL	245	}
8bf36651 SL	246
f000e828 P	247	static int drbg_hmac_uninstantiate(PROV_DRBG *drbg)
	248	{
	249	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
8bf36651	250
f000e828 P	251	OPENSSL_cleanse(hmac->K, sizeof(hmac->K));
f000e828 P	252	OPENSSL_cleanse(hmac->V, sizeof(hmac->V));
7d6766cb	253	return ossl_prov_drbg_uninstantiate(drbg);
f000e828 P	254	}
	255
	256	static int drbg_hmac_uninstantiate_wrapper(void *vdrbg)
8bf36651	257	{
f000e828 P	258	return drbg_hmac_uninstantiate((PROV_DRBG *)vdrbg);
f000e828 P	259	}
8bf36651	260
f000e828 P	261	static int drbg_hmac_verify_zeroization(void *vdrbg)
	262	{
	263	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
	264	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
8bf36651	265
f000e828 P	266	PROV_DRBG_VERYIFY_ZEROIZATION(hmac->K);
	267	PROV_DRBG_VERYIFY_ZEROIZATION(hmac->V);
	268	return 1;
	269	}
5d0cf102	270
f000e828 P	271	static int drbg_hmac_new(PROV_DRBG *drbg)
	272	{
	273	PROV_DRBG_HMAC *hmac;
8bf36651	274
f000e828 P	275	hmac = OPENSSL_secure_zalloc(sizeof(*hmac));
	276	if (hmac == NULL) {
	277	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	278	return 0;
8bf36651 SL	279	}
8bf36651 SL	280
f000e828	281	drbg->data = hmac;
8bf36651	282	/* See SP800-57 Part1 Rev4 5.6.1 Table 3 */
3064b551	283	drbg->max_entropylen = DRBG_MAX_LENGTH;
3064b551	284	drbg->max_noncelen = DRBG_MAX_LENGTH;
8bf36651 SL	285	drbg->max_perslen = DRBG_MAX_LENGTH;
	286	drbg->max_adinlen = DRBG_MAX_LENGTH;
	287
f000e828	288	/* Maximum number of bits per request = 2^19 = 2^16 bytes */
8bf36651	289	drbg->max_request = 1 << 16;
8bf36651 SL	290	return 1;
8bf36651 SL	291	}
f000e828 P	292
	293	static void drbg_hmac_new_wrapper(void provctx, void *parent,
	294	const OSSL_DISPATCH *parent_dispatch)
	295	{
1dc188ba	296	return ossl_rand_drbg_new(provctx, parent, parent_dispatch, &drbg_hmac_new,
f000e828 P	297	&drbg_hmac_instantiate, &drbg_hmac_uninstantiate,
	298	&drbg_hmac_reseed, &drbg_hmac_generate);
	299	}
	300
	301	static void drbg_hmac_free(void *vdrbg)
	302	{
	303	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
	304	PROV_DRBG_HMAC *hmac;
	305
	306	if (drbg != NULL && (hmac = (PROV_DRBG_HMAC *)drbg->data) != NULL) {
e4162f86	307	EVP_MAC_CTX_free(hmac->ctx);
f000e828 P	308	ossl_prov_digest_reset(&hmac->digest);
	309	OPENSSL_secure_clear_free(hmac, sizeof(*hmac));
	310	}
1dc188ba	311	ossl_rand_drbg_free(drbg);
f000e828 P	312	}
	313
	314	static int drbg_hmac_get_ctx_params(void *vdrbg, OSSL_PARAM params[])
	315	{
	316	PROV_DRBG drbg = (PROV_DRBG )vdrbg;
0ed26fb6 P	317	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )drbg->data;
	318	const char *name;
	319	const EVP_MD *md;
	320	OSSL_PARAM *p;
	321
	322	p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_MAC);
	323	if (p != NULL) {
	324	if (hmac->ctx == NULL)
	325	return 0;
	326	name = EVP_MAC_name(EVP_MAC_CTX_mac(hmac->ctx));
	327	if (!OSSL_PARAM_set_utf8_string(p, name))
	328	return 0;
	329	}
	330
	331	p = OSSL_PARAM_locate(params, OSSL_DRBG_PARAM_DIGEST);
	332	if (p != NULL) {
	333	md = ossl_prov_digest_md(&hmac->digest);
	334	if (md == NULL \|\| !OSSL_PARAM_set_utf8_string(p, EVP_MD_name(md)))
	335	return 0;
	336	}
f000e828	337
b24d6c33	338	return ossl_drbg_get_ctx_params(drbg, params);
f000e828 P	339	}
f000e828 P	340
a3f091fd P	341	static const OSSL_PARAM drbg_hmac_gettable_ctx_params(ossl_unused void vctx,
a3f091fd P	342	ossl_unused void *p_ctx)
f000e828 P	343	{
f000e828 P	344	static const OSSL_PARAM known_gettable_ctx_params[] = {
0ed26fb6 P	345	OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),
0ed26fb6 P	346	OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),
82a7b2fb	347	OSSL_PARAM_DRBG_GETTABLE_CTX_COMMON,
f000e828 P	348	OSSL_PARAM_END
	349	};
	350	return known_gettable_ctx_params;
	351	}
	352
	353	static int drbg_hmac_set_ctx_params(void *vctx, const OSSL_PARAM params[])
	354	{
	355	PROV_DRBG ctx = (PROV_DRBG )vctx;
	356	PROV_DRBG_HMAC hmac = (PROV_DRBG_HMAC )ctx->data;
a829b735	357	OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(ctx->provctx);
f000e828 P	358	const EVP_MD *md;
	359
	360	if (!ossl_prov_digest_load_from_params(&hmac->digest, params, libctx))
	361	return 0;
	362
	363	/*
	364	* Confirm digest is allowed. We allow all digests that are not XOF
	365	* (such as SHAKE). In FIPS mode, the fetch will fail for non-approved
	366	* digests.
	367	*/
	368	md = ossl_prov_digest_md(&hmac->digest);
	369	if (md != NULL && (EVP_MD_flags(md) & EVP_MD_FLAG_XOF) != 0) {
	370	ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED);
	371	return 0;
	372	}
	373
	374	if (!ossl_prov_macctx_load_from_params(&hmac->ctx, params,
	375	NULL, NULL, NULL, libctx))
	376	return 0;
	377
	378	if (hmac->ctx != NULL) {
	379	/* These are taken from SP 800-90 10.1 Table 2 */
	380	hmac->blocklen = EVP_MD_size(md);
	381	/* See SP800-57 Part1 Rev4 5.6.1 Table 3 */
	382	ctx->strength = 64 * (int)(hmac->blocklen >> 3);
	383	if (ctx->strength > 256)
	384	ctx->strength = 256;
	385	ctx->seedlen = hmac->blocklen;
	386	ctx->min_entropylen = ctx->strength / 8;
	387	ctx->min_noncelen = ctx->min_entropylen / 2;
	388	}
	389
b24d6c33	390	return ossl_drbg_set_ctx_params(ctx, params);
f000e828 P	391	}
f000e828 P	392
a3f091fd P	393	static const OSSL_PARAM drbg_hmac_settable_ctx_params(ossl_unused void vctx,
a3f091fd P	394	ossl_unused void *p_ctx)
f000e828 P	395	{
	396	static const OSSL_PARAM known_settable_ctx_params[] = {
	397	OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_PROPERTIES, NULL, 0),
	398	OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_DIGEST, NULL, 0),
	399	OSSL_PARAM_utf8_string(OSSL_DRBG_PARAM_MAC, NULL, 0),
82a7b2fb	400	OSSL_PARAM_DRBG_SETTABLE_CTX_COMMON,
f000e828 P	401	OSSL_PARAM_END
	402	};
	403	return known_settable_ctx_params;
	404	}
	405
1be63951	406	const OSSL_DISPATCH ossl_drbg_ossl_hmac_functions[] = {
f000e828 P	407	{ OSSL_FUNC_RAND_NEWCTX, (void(*)(void))drbg_hmac_new_wrapper },
	408	{ OSSL_FUNC_RAND_FREECTX, (void(*)(void))drbg_hmac_free },
	409	{ OSSL_FUNC_RAND_INSTANTIATE,
	410	(void(*)(void))drbg_hmac_instantiate_wrapper },
	411	{ OSSL_FUNC_RAND_UNINSTANTIATE,
	412	(void(*)(void))drbg_hmac_uninstantiate_wrapper },
	413	{ OSSL_FUNC_RAND_GENERATE, (void(*)(void))drbg_hmac_generate_wrapper },
	414	{ OSSL_FUNC_RAND_RESEED, (void(*)(void))drbg_hmac_reseed_wrapper },
b24d6c33 P	415	{ OSSL_FUNC_RAND_ENABLE_LOCKING, (void(*)(void))ossl_drbg_enable_locking },
	416	{ OSSL_FUNC_RAND_LOCK, (void(*)(void))ossl_drbg_lock },
	417	{ OSSL_FUNC_RAND_UNLOCK, (void(*)(void))ossl_drbg_unlock },
f000e828 P	418	{ OSSL_FUNC_RAND_SETTABLE_CTX_PARAMS,
	419	(void(*)(void))drbg_hmac_settable_ctx_params },
	420	{ OSSL_FUNC_RAND_SET_CTX_PARAMS, (void(*)(void))drbg_hmac_set_ctx_params },
	421	{ OSSL_FUNC_RAND_GETTABLE_CTX_PARAMS,
	422	(void(*)(void))drbg_hmac_gettable_ctx_params },
	423	{ OSSL_FUNC_RAND_GET_CTX_PARAMS, (void(*)(void))drbg_hmac_get_ctx_params },
f000e828 P	424	{ OSSL_FUNC_RAND_VERIFY_ZEROIZATION,
f000e828 P	425	(void(*)(void))drbg_hmac_verify_zeroization },
335e85f5 P	426	{ OSSL_FUNC_RAND_GET_SEED, (void(*)(void))ossl_drbg_get_seed },
335e85f5 P	427	{ OSSL_FUNC_RAND_CLEAR_SEED, (void(*)(void))ossl_drbg_clear_seed },
f000e828 P	428	{ 0, NULL }
f000e828 P	429	};