--- /dev/null
+/*
+ * Copyright 2018-2021 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 <openssl/evp.h>
+#include <openssl/core_names.h>
+#include <openssl/proverr.h>
+#include <openssl/err.h>
+#include "prov/provider_ctx.h"
+#include "prov/providercommon.h"
+#include "prov/implementations.h"
+#include "prov/provider_util.h"
+
+static OSSL_FUNC_kdf_newctx_fn kdf_pvk_new;
+static OSSL_FUNC_kdf_freectx_fn kdf_pvk_free;
+static OSSL_FUNC_kdf_reset_fn kdf_pvk_reset;
+static OSSL_FUNC_kdf_derive_fn kdf_pvk_derive;
+static OSSL_FUNC_kdf_settable_ctx_params_fn kdf_pvk_settable_ctx_params;
+static OSSL_FUNC_kdf_set_ctx_params_fn kdf_pvk_set_ctx_params;
+static OSSL_FUNC_kdf_gettable_ctx_params_fn kdf_pvk_gettable_ctx_params;
+static OSSL_FUNC_kdf_get_ctx_params_fn kdf_pvk_get_ctx_params;
+
+typedef struct {
+ void *provctx;
+ unsigned char *pass;
+ size_t pass_len;
+ unsigned char *salt;
+ size_t salt_len;
+ PROV_DIGEST digest;
+} KDF_PVK;
+
+static void kdf_pvk_init(KDF_PVK *ctx);
+
+static void *kdf_pvk_new(void *provctx)
+{
+ KDF_PVK *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;
+ kdf_pvk_init(ctx);
+ return ctx;
+}
+
+static void kdf_pvk_cleanup(KDF_PVK *ctx)
+{
+ ossl_prov_digest_reset(&ctx->digest);
+ OPENSSL_free(ctx->salt);
+ OPENSSL_clear_free(ctx->pass, ctx->pass_len);
+ OPENSSL_cleanse(ctx, sizeof(*ctx));
+}
+
+static void kdf_pvk_free(void *vctx)
+{
+ KDF_PVK *ctx = (KDF_PVK *)vctx;
+
+ if (ctx != NULL) {
+ kdf_pvk_cleanup(ctx);
+ OPENSSL_free(ctx);
+ }
+}
+
+static void kdf_pvk_reset(void *vctx)
+{
+ KDF_PVK *ctx = (KDF_PVK *)vctx;
+ void *provctx = ctx->provctx;
+
+ kdf_pvk_cleanup(ctx);
+ ctx->provctx = provctx;
+ kdf_pvk_init(ctx);
+}
+
+static void kdf_pvk_init(KDF_PVK *ctx)
+{
+ OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
+ OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
+
+ params[0] = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
+ SN_sha1, 0);
+ if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
+ /* This is an error, but there is no way to indicate such directly */
+ ossl_prov_digest_reset(&ctx->digest);
+}
+
+static int pvk_set_membuf(unsigned char **buffer, size_t *buflen,
+ const OSSL_PARAM *p)
+{
+ OPENSSL_clear_free(*buffer, *buflen);
+ if (p->data_size == 0) {
+ if ((*buffer = OPENSSL_malloc(1)) == NULL) {
+ ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ } else if (p->data != NULL) {
+ *buffer = NULL;
+ if (!OSSL_PARAM_get_octet_string(p, (void **)buffer, 0, buflen))
+ return 0;
+ }
+ return 1;
+}
+
+static int kdf_pvk_derive(void *vctx, unsigned char *key, size_t keylen,
+ const OSSL_PARAM params[])
+{
+ KDF_PVK *ctx = (KDF_PVK *)vctx;
+ const EVP_MD *md;
+ EVP_MD_CTX *mctx;
+ int res;
+
+ if (!ossl_prov_is_running() || !kdf_pvk_set_ctx_params(ctx, params))
+ return 0;
+
+ if (ctx->pass == NULL) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_PASS);
+ return 0;
+ }
+
+ if (ctx->salt == NULL) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_SALT);
+ return 0;
+ }
+
+ md = ossl_prov_digest_md(&ctx->digest);
+ if (md == NULL) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
+ return 0;
+ }
+ res = EVP_MD_get_size(md);
+ if (res <= 0) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
+ return 0;
+ }
+ if ((size_t)res > keylen) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_LENGTH_TOO_LARGE);
+ return 0;
+ }
+
+ mctx = EVP_MD_CTX_new();
+ res = mctx != NULL
+ && EVP_DigestInit_ex(mctx, md, NULL)
+ && EVP_DigestUpdate(mctx, ctx->salt, ctx->salt_len)
+ && EVP_DigestUpdate(mctx, ctx->pass, ctx->pass_len)
+ && EVP_DigestFinal_ex(mctx, key, NULL);
+ EVP_MD_CTX_free(mctx);
+ return res;
+}
+
+static int kdf_pvk_set_ctx_params(void *vctx, const OSSL_PARAM params[])
+{
+ const OSSL_PARAM *p;
+ KDF_PVK *ctx = vctx;
+ OSSL_LIB_CTX *provctx = PROV_LIBCTX_OF(ctx->provctx);
+
+ if (params == NULL)
+ return 1;
+
+ if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx))
+ return 0;
+
+ if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PASSWORD)) != NULL)
+ if (!pvk_set_membuf(&ctx->pass, &ctx->pass_len, p))
+ return 0;
+
+ if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_SALT)) != NULL) {
+ if (!pvk_set_membuf(&ctx->salt, &ctx->salt_len,p))
+ return 0;
+ }
+
+ return 1;
+}
+
+static const OSSL_PARAM *kdf_pvk_settable_ctx_params(ossl_unused void *ctx,
+ ossl_unused void *p_ctx)
+{
+ static const OSSL_PARAM known_settable_ctx_params[] = {
+ OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_PROPERTIES, NULL, 0),
+ OSSL_PARAM_utf8_string(OSSL_KDF_PARAM_DIGEST, NULL, 0),
+ OSSL_PARAM_octet_string(OSSL_KDF_PARAM_PASSWORD, NULL, 0),
+ OSSL_PARAM_octet_string(OSSL_KDF_PARAM_SALT, NULL, 0),
+ OSSL_PARAM_END
+ };
+ return known_settable_ctx_params;
+}
+
+static int kdf_pvk_get_ctx_params(void *vctx, OSSL_PARAM params[])
+{
+ OSSL_PARAM *p;
+
+ if ((p = OSSL_PARAM_locate(params, OSSL_KDF_PARAM_SIZE)) != NULL)
+ return OSSL_PARAM_set_size_t(p, SIZE_MAX);
+ return -2;
+}
+
+static const OSSL_PARAM *kdf_pvk_gettable_ctx_params(ossl_unused void *ctx,
+ ossl_unused void *p_ctx)
+{
+ static const OSSL_PARAM known_gettable_ctx_params[] = {
+ OSSL_PARAM_size_t(OSSL_KDF_PARAM_SIZE, NULL),
+ OSSL_PARAM_END
+ };
+ return known_gettable_ctx_params;
+}
+
+const OSSL_DISPATCH ossl_kdf_pvk_functions[] = {
+ { OSSL_FUNC_KDF_NEWCTX, (void(*)(void))kdf_pvk_new },
+ { OSSL_FUNC_KDF_FREECTX, (void(*)(void))kdf_pvk_free },
+ { OSSL_FUNC_KDF_RESET, (void(*)(void))kdf_pvk_reset },
+ { OSSL_FUNC_KDF_DERIVE, (void(*)(void))kdf_pvk_derive },
+ { OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS,
+ (void(*)(void))kdf_pvk_settable_ctx_params },
+ { OSSL_FUNC_KDF_SET_CTX_PARAMS, (void(*)(void))kdf_pvk_set_ctx_params },
+ { OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS,
+ (void(*)(void))kdf_pvk_gettable_ctx_params },
+ { OSSL_FUNC_KDF_GET_CTX_PARAMS, (void(*)(void))kdf_pvk_get_ctx_params },
+ { 0, NULL }
+};
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