diff options
Diffstat (limited to 'providers/implementations/kdfs/hmacdrbg_kdf.c')
| -rw-r--r-- | providers/implementations/kdfs/hmacdrbg_kdf.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/providers/implementations/kdfs/hmacdrbg_kdf.c b/providers/implementations/kdfs/hmacdrbg_kdf.c new file mode 100644 index 0000000000..6a37541120 --- /dev/null +++ b/providers/implementations/kdfs/hmacdrbg_kdf.c @@ -0,0 +1,259 @@ +/* + * Copyright 2022 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/kdf.h> +#include <openssl/proverr.h> +#include <openssl/core_names.h> +#include "prov/providercommon.h" +#include "prov/implementations.h" +#include "prov/hmac_drbg.h" +#include "prov/provider_ctx.h" + +static OSSL_FUNC_kdf_newctx_fn hmac_drbg_kdf_new; +static OSSL_FUNC_kdf_dupctx_fn hmac_drbg_kdf_dup; +static OSSL_FUNC_kdf_freectx_fn hmac_drbg_kdf_free; +static OSSL_FUNC_kdf_reset_fn hmac_drbg_kdf_reset; +static OSSL_FUNC_kdf_derive_fn hmac_drbg_kdf_derive; +static OSSL_FUNC_kdf_settable_ctx_params_fn hmac_drbg_kdf_settable_ctx_params; +static OSSL_FUNC_kdf_set_ctx_params_fn hmac_drbg_kdf_set_ctx_params; +static OSSL_FUNC_kdf_gettable_ctx_params_fn hmac_drbg_kdf_gettable_ctx_params; +static OSSL_FUNC_kdf_get_ctx_params_fn hmac_drbg_kdf_get_ctx_params; + +typedef struct { + PROV_DRBG_HMAC base; + void *provctx; + unsigned char *entropy, *nonce; + size_t entropylen, noncelen; + int init; +} KDF_HMAC_DRBG; + +static void *hmac_drbg_kdf_new(void *provctx) +{ + KDF_HMAC_DRBG *ctx; + + if (!ossl_prov_is_running()) + return NULL; + + ctx = OPENSSL_zalloc(sizeof(*ctx)); + if (ctx == NULL) { + ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE); + return NULL; + } + ctx->provctx = provctx; + return ctx; +} + +static void hmac_drbg_kdf_reset(void *vctx) +{ + KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; + PROV_DRBG_HMAC *drbg = &ctx->base; + void *provctx = ctx->provctx; + + EVP_MAC_CTX_free(drbg->ctx); + ossl_prov_digest_reset(&drbg->digest); + OPENSSL_clear_free(ctx->entropy, ctx->entropylen); + OPENSSL_clear_free(ctx->nonce, ctx->noncelen); + OPENSSL_cleanse(ctx, sizeof(*ctx)); + ctx->provctx = provctx; +} + +static void hmac_drbg_kdf_free(void *vctx) +{ + KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; + + if (ctx != NULL) { + hmac_drbg_kdf_reset(ctx); + OPENSSL_free(ctx); + } +} + +static int ossl_drbg_hmac_dup(PROV_DRBG_HMAC *dst, const PROV_DRBG_HMAC *src) { + if (src->ctx != NULL) { + dst->ctx = EVP_MAC_CTX_dup(src->ctx); + if (dst->ctx == NULL) + return 0; + } + if (!ossl_prov_digest_copy(&dst->digest, &src->digest)) + return 0; + memcpy(dst->K, src->K, sizeof(dst->K)); + memcpy(dst->V, src->V, sizeof(dst->V)); + dst->blocklen = src->blocklen; + return 1; +} + +static void *hmac_drbg_kdf_dup(void *vctx) +{ + const KDF_HMAC_DRBG *src = (const KDF_HMAC_DRBG *)vctx; + KDF_HMAC_DRBG *dst; + + dst = hmac_drbg_kdf_new(src->provctx); + if (dst != NULL) { + if (!ossl_drbg_hmac_dup(&dst->base, &src->base) + || !ossl_prov_memdup(src->entropy, src->entropylen, + &dst->entropy , &dst->entropylen) + || !ossl_prov_memdup(src->nonce, src->noncelen, + &dst->nonce, &dst->noncelen)) + goto err; + dst->init = src->init; + } + return dst; + + err: + hmac_drbg_kdf_free(dst); + return NULL; +} + +static int hmac_drbg_kdf_derive(void *vctx, unsigned char *out, size_t outlen, + const OSSL_PARAM params[]) +{ + KDF_HMAC_DRBG *ctx = (KDF_HMAC_DRBG *)vctx; + PROV_DRBG_HMAC *drbg = &ctx->base; + + if (!ossl_prov_is_running() + || !hmac_drbg_kdf_set_ctx_params(vctx, params)) + return 0; + if (!ctx->init) { + if (ctx->entropy == NULL + || ctx->entropylen == 0 + || ctx->nonce == NULL + || ctx->noncelen == 0 + || !ossl_drbg_hmac_init(drbg, ctx->entropy, ctx->entropylen, + ctx->nonce, ctx->noncelen, NULL, 0)) + return 0; + ctx->init = 1; + } + + return ossl_drbg_hmac_generate(drbg, out, outlen, NULL, 0); +} + +static int hmac_drbg_kdf_get_ctx_params(void *vctx, OSSL_PARAM params[]) +{ + KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx; + PROV_DRBG_HMAC *drbg = &hmac->base; + const char *name; + const EVP_MD *md; + OSSL_PARAM *p; + + p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_MAC); + if (p != NULL) { + if (drbg->ctx == NULL) + return 0; + name = EVP_MAC_get0_name(EVP_MAC_CTX_get0_mac(drbg->ctx)); + if (!OSSL_PARAM_set_utf8_string(p, name)) + return 0; + } + + p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_DIGEST); + if (p != NULL) { + md = ossl_prov_digest_md(&drbg->digest); + if (md == NULL || !OSSL_PARAM_set_utf8_string(p, EVP_MD_get0_name(md))) + return 0; + } + return 1; +} + +static const OSSL_PARAM *hmac_drbg_kdf_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_KDF_PARAM_MAC, NULL, 0), + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), + OSSL_PARAM_END + }; + return known_gettable_ctx_params; +} + +static int hmac_drbg_kdf_set_ctx_params(void *vctx, + const OSSL_PARAM params[]) +{ + KDF_HMAC_DRBG *hmac = (KDF_HMAC_DRBG *)vctx; + PROV_DRBG_HMAC *drbg = &hmac->base; + OSSL_LIB_CTX *libctx = PROV_LIBCTX_OF(hmac->provctx); + const EVP_MD *md; + const OSSL_PARAM *p; + void *ptr = NULL; + size_t size = 0; + + if (params == NULL) + return 1; + + p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_ENTROPY); + if (p != NULL) { + if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size)) + return 0; + OPENSSL_free(hmac->entropy); + hmac->entropy = ptr; + hmac->entropylen = size; + hmac->init = 0; + ptr = NULL; + } + + p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_HMACDRBG_NONCE); + if (p != NULL) { + if (!OSSL_PARAM_get_octet_string(p, &ptr, 0, &size)) + return 0; + OPENSSL_free(hmac->nonce); + hmac->nonce = ptr; + hmac->noncelen = size; + hmac->init = 0; + } + + p = OSSL_PARAM_locate_const(params, OSSL_ALG_PARAM_DIGEST); + if (p != NULL) { + if (!ossl_prov_digest_load_from_params(&drbg->digest, params, libctx)) + return 0; + + /* Confirm digest is allowed. Allow all digests that are not XOF */ + md = ossl_prov_digest_md(&drbg->digest); + if (md != NULL) { + if ((EVP_MD_get_flags(md) & EVP_MD_FLAG_XOF) != 0) { + ERR_raise(ERR_LIB_PROV, PROV_R_XOF_DIGESTS_NOT_ALLOWED); + return 0; + } + drbg->blocklen = EVP_MD_get_size(md); + } + return ossl_prov_macctx_load_from_params(&drbg->ctx, params, + "HMAC", NULL, NULL, libctx); + } + return 1; +} + +static const OSSL_PARAM *hmac_drbg_kdf_settable_ctx_params( + ossl_unused void *vctx, ossl_unused void *p_ctx) +{ + static const OSSL_PARAM known_settable_ctx_params[] = { + OSSL_PARAM_octet_string(OSSL_KDF_PARAM_HMACDRBG_ENTROPY, NULL, 0), + OSSL_PARAM_octet_string(OSSL_KDF_PARAM_HMACDRBG_NONCE, NULL, 0), + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0), + OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0), + OSSL_PARAM_END + }; + return known_settable_ctx_params; +} + +const OSSL_DISPATCH ossl_kdf_hmac_drbg_functions[] = { + { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))hmac_drbg_kdf_new }, + { OSSL_FUNC_KDF_FREECTX, (void(*)(void))hmac_drbg_kdf_free }, + { OSSL_FUNC_KDF_DUPCTX, (void(*)(void))hmac_drbg_kdf_dup }, + { OSSL_FUNC_KDF_RESET, (void(*)(void))hmac_drbg_kdf_reset }, + { OSSL_FUNC_KDF_DERIVE, (void(*)(void))hmac_drbg_kdf_derive }, + { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS, + (void(*)(void))hmac_drbg_kdf_settable_ctx_params }, + { OSSL_FUNC_KDF_SET_CTX_PARAMS, + (void(*)(void))hmac_drbg_kdf_set_ctx_params }, + { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS, + (void(*)(void))hmac_drbg_kdf_gettable_ctx_params }, + { OSSL_FUNC_KDF_GET_CTX_PARAMS, + (void(*)(void))hmac_drbg_kdf_get_ctx_params }, + { 0, NULL } +}; |