mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
af5e1e852d
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/12581)
351 lines
11 KiB
C
351 lines
11 KiB
C
/*
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* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2019 Red Hat, Inc.
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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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* This implements https://csrc.nist.gov/publications/detail/sp/800-108/final
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* section 5.1 ("counter mode") and section 5.2 ("feedback mode") in both HMAC
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* and CMAC. That document does not name the KDFs it defines; the name is
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* derived from
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* https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/Key-Derivation
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*
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* Note that section 5.3 ("double-pipeline mode") is not implemented, though
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* it would be possible to do so in the future.
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*
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* These versions all assume the counter is used. It would be relatively
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* straightforward to expose a configuration handle should the need arise.
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*
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* Variable names attempt to match those of SP800-108.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/kdf.h>
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#include <openssl/params.h>
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#include "internal/cryptlib.h"
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#include "crypto/evp.h"
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#include "internal/numbers.h"
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#include "internal/endian.h"
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "prov/provider_util.h"
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#include "prov/providercommonerr.h"
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#include "e_os.h"
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#define MIN(a, b) ((a) < (b)) ? (a) : (b)
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typedef enum {
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COUNTER = 0,
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FEEDBACK
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} kbkdf_mode;
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/* Our context structure. */
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typedef struct {
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void *provctx;
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kbkdf_mode mode;
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EVP_MAC_CTX *ctx_init;
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/* Names are lowercased versions of those found in SP800-108. */
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unsigned char *ki;
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size_t ki_len;
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unsigned char *label;
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size_t label_len;
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unsigned char *context;
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size_t context_len;
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unsigned char *iv;
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size_t iv_len;
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} KBKDF;
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/* Definitions needed for typechecking. */
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static OSSL_FUNC_kdf_newctx_fn kbkdf_new;
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static OSSL_FUNC_kdf_freectx_fn kbkdf_free;
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static OSSL_FUNC_kdf_reset_fn kbkdf_reset;
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static OSSL_FUNC_kdf_derive_fn kbkdf_derive;
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static OSSL_FUNC_kdf_settable_ctx_params_fn kbkdf_settable_ctx_params;
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static OSSL_FUNC_kdf_set_ctx_params_fn kbkdf_set_ctx_params;
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static OSSL_FUNC_kdf_gettable_ctx_params_fn kbkdf_gettable_ctx_params;
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static OSSL_FUNC_kdf_get_ctx_params_fn kbkdf_get_ctx_params;
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/* Not all platforms have htobe32(). */
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static uint32_t be32(uint32_t host)
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{
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uint32_t big = 0;
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DECLARE_IS_ENDIAN;
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if (!IS_LITTLE_ENDIAN)
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return host;
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big |= (host & 0xff000000) >> 24;
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big |= (host & 0x00ff0000) >> 8;
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big |= (host & 0x0000ff00) << 8;
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big |= (host & 0x000000ff) << 24;
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return big;
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}
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static void *kbkdf_new(void *provctx)
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{
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KBKDF *ctx;
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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 kbkdf_free(void *vctx)
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{
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KBKDF *ctx = (KBKDF *)vctx;
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if (ctx != NULL) {
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kbkdf_reset(ctx);
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OPENSSL_free(ctx);
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}
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}
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static void kbkdf_reset(void *vctx)
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{
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KBKDF *ctx = (KBKDF *)vctx;
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void *provctx = ctx->provctx;
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EVP_MAC_CTX_free(ctx->ctx_init);
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OPENSSL_clear_free(ctx->context, ctx->context_len);
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OPENSSL_clear_free(ctx->label, ctx->label_len);
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OPENSSL_clear_free(ctx->ki, ctx->ki_len);
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OPENSSL_clear_free(ctx->iv, ctx->iv_len);
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memset(ctx, 0, sizeof(*ctx));
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ctx->provctx = provctx;
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}
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/* SP800-108 section 5.1 or section 5.2 depending on mode. */
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static int derive(EVP_MAC_CTX *ctx_init, kbkdf_mode mode, unsigned char *iv,
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size_t iv_len, unsigned char *label, size_t label_len,
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unsigned char *context, size_t context_len,
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unsigned char *k_i, size_t h, uint32_t l, unsigned char *ko,
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size_t ko_len)
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{
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int ret = 0;
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EVP_MAC_CTX *ctx = NULL;
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size_t written = 0, to_write, k_i_len = iv_len;
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const unsigned char zero = 0;
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uint32_t counter, i;
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/* Setup K(0) for feedback mode. */
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if (iv_len > 0)
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memcpy(k_i, iv, iv_len);
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for (counter = 1; written < ko_len; counter++) {
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i = be32(counter);
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ctx = EVP_MAC_CTX_dup(ctx_init);
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if (ctx == NULL)
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goto done;
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/* Perform feedback, if appropriate. */
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if (mode == FEEDBACK && !EVP_MAC_update(ctx, k_i, k_i_len))
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goto done;
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if (!EVP_MAC_update(ctx, (unsigned char *)&i, 4)
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|| !EVP_MAC_update(ctx, label, label_len)
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|| !EVP_MAC_update(ctx, &zero, 1)
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|| !EVP_MAC_update(ctx, context, context_len)
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|| !EVP_MAC_update(ctx, (unsigned char *)&l, 4)
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|| !EVP_MAC_final(ctx, k_i, NULL, h))
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goto done;
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to_write = ko_len - written;
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memcpy(ko + written, k_i, MIN(to_write, h));
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written += h;
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k_i_len = h;
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EVP_MAC_CTX_free(ctx);
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ctx = NULL;
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}
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ret = 1;
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done:
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EVP_MAC_CTX_free(ctx);
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return ret;
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}
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static int kbkdf_derive(void *vctx, unsigned char *key, size_t keylen)
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{
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KBKDF *ctx = (KBKDF *)vctx;
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int ret = 0;
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unsigned char *k_i = NULL;
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uint32_t l = be32(keylen * 8);
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size_t h = 0;
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/* label, context, and iv are permitted to be empty. Check everything
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* else. */
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if (ctx->ctx_init == NULL) {
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if (ctx->ki_len == 0 || ctx->ki == NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
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return 0;
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}
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/* Could either be missing MAC or missing message digest or missing
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* cipher - arbitrarily, I pick this one. */
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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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h = EVP_MAC_size(ctx->ctx_init);
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if (h == 0)
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goto done;
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if (ctx->iv_len != 0 && ctx->iv_len != h) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_SEED_LENGTH);
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goto done;
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}
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k_i = OPENSSL_zalloc(h);
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if (k_i == NULL)
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goto done;
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ret = derive(ctx->ctx_init, ctx->mode, ctx->iv, ctx->iv_len, ctx->label,
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ctx->label_len, ctx->context, ctx->context_len, k_i, h, l,
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key, keylen);
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done:
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if (ret != 1)
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OPENSSL_cleanse(key, keylen);
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OPENSSL_clear_free(k_i, h);
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return ret;
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}
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static int kbkdf_set_buffer(unsigned char **out, size_t *out_len,
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const OSSL_PARAM *p)
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{
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if (p->data == NULL || p->data_size == 0)
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return 1;
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OPENSSL_clear_free(*out, *out_len);
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*out = NULL;
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return OSSL_PARAM_get_octet_string(p, (void **)out, 0, out_len);
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}
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static int kbkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[])
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{
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KBKDF *ctx = (KBKDF *)vctx;
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OPENSSL_CTX *libctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx);
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const OSSL_PARAM *p;
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OSSL_PARAM mparams[2];
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if (!ossl_prov_macctx_load_from_params(&ctx->ctx_init, params, NULL,
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NULL, NULL, libctx))
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return 0;
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else if (ctx->ctx_init != NULL
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&& !EVP_MAC_is_a(EVP_MAC_CTX_mac(ctx->ctx_init),
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OSSL_MAC_NAME_HMAC)
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&& !EVP_MAC_is_a(EVP_MAC_CTX_mac(ctx->ctx_init),
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OSSL_MAC_NAME_CMAC)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MAC);
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return 0;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_MODE);
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if (p != NULL && strncasecmp("counter", p->data, p->data_size) == 0) {
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ctx->mode = COUNTER;
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} else if (p != NULL
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&& strncasecmp("feedback", p->data, p->data_size) == 0) {
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ctx->mode = FEEDBACK;
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} else if (p != NULL) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_MODE);
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return 0;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY);
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if (p != NULL && !kbkdf_set_buffer(&ctx->ki, &ctx->ki_len, p))
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return 0;
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT);
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if (p != NULL && !kbkdf_set_buffer(&ctx->label, &ctx->label_len, p))
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return 0;
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_INFO);
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if (p != NULL && !kbkdf_set_buffer(&ctx->context, &ctx->context_len, p))
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return 0;
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p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SEED);
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if (p != NULL && !kbkdf_set_buffer(&ctx->iv, &ctx->iv_len, p))
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return 0;
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/* Set up digest context, if we can. */
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if (ctx->ctx_init != NULL && ctx->ki_len != 0) {
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mparams[0] = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
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ctx->ki, ctx->ki_len);
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mparams[1] = OSSL_PARAM_construct_end();
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if (!EVP_MAC_CTX_set_params(ctx->ctx_init, mparams)
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|| !EVP_MAC_init(ctx->ctx_init))
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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 *kbkdf_settable_ctx_params(void *provctx)
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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_INFO, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_KEY, NULL, 0),
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OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SEED, 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_CIPHER, NULL, 0),
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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_MODE, 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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static int kbkdf_get_ctx_params(void *vctx, OSSL_PARAM params[])
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{
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OSSL_PARAM *p;
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p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE);
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if (p == NULL)
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return -2;
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/* KBKDF can produce results as large as you like. */
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return OSSL_PARAM_set_size_t(p, SIZE_MAX);
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}
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static const OSSL_PARAM *kbkdf_gettable_ctx_params(void *provctx)
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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), OSSL_PARAM_END };
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return known_gettable_ctx_params;
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}
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const OSSL_DISPATCH kdf_kbkdf_functions[] = {
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{ OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kbkdf_new },
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{ OSSL_FUNC_KDF_FREECTX, (void(*)(void))kbkdf_free },
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{ OSSL_FUNC_KDF_RESET, (void(*)(void))kbkdf_reset },
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{ OSSL_FUNC_KDF_DERIVE, (void(*)(void))kbkdf_derive },
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{ OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
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(void(*)(void))kbkdf_settable_ctx_params },
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{ OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kbkdf_set_ctx_params },
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{ OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
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(void(*)(void))kbkdf_gettable_ctx_params },
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{ OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kbkdf_get_ctx_params },
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{ 0, NULL },
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};
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