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/* SPDX-License-Identifier: BSD-3-Clause */
#include <string.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/provider.h>
#include <openssl/store.h>
#include <openssl/ui.h>
int generate_and_save(const char *filename, const char *password)
{
OSSL_PARAM params[3];
EVP_PKEY_CTX *pctx = NULL;
EVP_PKEY *pkey = NULL;
BIO *out = NULL;
int ret = 1;
if (!(pctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", "provider=tpm2")))
goto error;
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_GROUP_NAME, "P-256", 0);
params[1] = OSSL_PARAM_construct_utf8_string("user-auth", (char *)password, 0);
params[2] = OSSL_PARAM_construct_end();
if (EVP_PKEY_keygen_init(pctx) <= 0
|| EVP_PKEY_CTX_set_params(pctx, params) <= 0
|| EVP_PKEY_generate(pctx, &pkey) <= 0)
goto error;
// save the TPM2-protected private key as the "TSS2 PRIVATE KEY"
if ((out = BIO_new_file(filename, "w")) == NULL
|| !PEM_write_bio_PrivateKey(out, pkey, 0, NULL, 0, 0, NULL))
goto error;
ret = 0;
error:
BIO_free_all(out);
EVP_PKEY_free(pkey);
EVP_PKEY_CTX_free(pctx);
return ret;
}
int provide_password(char *buf, int size, int rwflag, void *u)
{
const char *password = (char *)u;
size_t len = strlen(password);
if (len > size)
len = size;
memcpy(buf, password, len);
return len;
}
int sign_message(EVP_PKEY *pkey)
{
EVP_MD_CTX *sctx = NULL;
EVP_MD_CTX *vctx = NULL;
unsigned char *sig = NULL;
size_t sig_len = 0;
int ret = 1;
const char *message = "Sabai Sabai";
// sign
if (!(sctx = EVP_MD_CTX_new()))
goto error;
if (!EVP_DigestSignInit_ex(sctx, NULL, "SHA-256", NULL, "provider=tpm2", pkey, NULL)
|| !EVP_DigestSign(sctx, NULL, &sig_len, (const unsigned char *)message, strlen(message)))
goto error;
if (!(sig = OPENSSL_malloc(sig_len)))
goto error;
if (!EVP_DigestSign(sctx, sig, &sig_len, (const unsigned char *)message, strlen(message)))
goto error;
// verify
if (!(vctx = EVP_MD_CTX_new()))
goto error;
if (!EVP_DigestVerifyInit_ex(vctx, NULL, "SHA-256", NULL, "provider=tpm2", pkey, NULL)
|| EVP_DigestVerify(vctx, sig, sig_len, (const unsigned char *)message, strlen(message)) != 1)
goto error;
ret = 0;
error:
OPENSSL_free(sig);
EVP_MD_CTX_free(vctx);
EVP_MD_CTX_free(sctx);
return ret;
}
int load_and_sign(const char *filename, const char *password)
{
OSSL_STORE_CTX *ctx = NULL;
UI_METHOD *ui_method = NULL;
int ret = 1;
if (!(ui_method = UI_UTIL_wrap_read_pem_callback(provide_password, 0)))
goto error;
if ((ctx = OSSL_STORE_open(filename, ui_method, (void *)password, NULL, NULL))) {
while (OSSL_STORE_eof(ctx) == 0) {
OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
if (info && OSSL_STORE_INFO_get_type(info) == OSSL_STORE_INFO_PKEY) {
EVP_PKEY *pkey;
if ((pkey = OSSL_STORE_INFO_get0_PKEY(info)))
ret = sign_message(pkey);
OSSL_STORE_INFO_free(info);
}
}
}
error:
OSSL_STORE_close(ctx);
UI_destroy_method(ui_method);
return ret;
}
#define TEST_FILENAME "ec_genpkey_store_load.pem"
#define TEST_PASSWORD "secret"
int main()
{
OSSL_PROVIDER *defprov = NULL, *tpm2prov = NULL;
int ret = 1;
if ((defprov = OSSL_PROVIDER_load(NULL, "default")) == NULL)
goto error;
if ((tpm2prov = OSSL_PROVIDER_load(NULL, "tpm2")) == NULL)
goto error;
if (generate_and_save(TEST_FILENAME, TEST_PASSWORD)
|| load_and_sign(TEST_FILENAME, TEST_PASSWORD))
goto error;
ret = 0;
error:
ERR_print_errors_fp(stderr);
remove(TEST_FILENAME);
OSSL_PROVIDER_unload(tpm2prov);
OSSL_PROVIDER_unload(defprov);
return ret;
}
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