tests: C API test for CSR generation

Fixes: #26

.gitignore

@@ -27,6 +27,9 @@ test/.dirstamp
 test/*.o
 test/*.trs
 test/selftest
+test/ec_genpkey_store_load
+test/ec_genpkey_x509_csr
+test/rsa_genpkey_decrypt
 tpm2-openssl-*-coverage.info
 tpm2-openssl-*-coverage/
 NVChip

Makefile.am

@@ -52,17 +52,25 @@ tpm2_la_LIBADD += $(TSS2_RC_LIBS)
 endif
 tpm2_la_LDFLAGS = -module -avoid-version -no-undefined -export-symbols-regex 'OSSL_provider_init' $(COMMON_LDFLAGS) $(CODE_COVERAGE_LDFLAGS)
 
-check_PROGRAMS = test/selftest test/ec_genpkey_store_load test/rsa_genpkey_decrypt
+check_PROGRAMS = test/selftest
 test_selftest_SOURCES = test/selftest.c
 test_selftest_CFLAGS = $(COMMON_CFLAGS)
 test_selftest_LDADD = $(CRYPTO_LIBS)
 test_selftest_LDFLAGS = $(COMMON_LDFLAGS)
 
+check_PROGRAMS += test/ec_genpkey_store_load
 test_ec_genpkey_store_load_SOURCES = test/ec_genpkey_store_load.c
 test_ec_genpkey_store_load_CFLAGS = $(COMMON_CFLAGS)
 test_ec_genpkey_store_load_LDADD = $(CRYPTO_LIBS)
 test_ec_genpkey_store_load_LDFLAGS = $(COMMON_LDFLAGS)
 
+check_PROGRAMS += test/ec_genpkey_x509_csr
+test_ec_genpkey_x509_csr_SOURCES = test/ec_genpkey_x509_csr.c
+test_ec_genpkey_x509_csr_CFLAGS = $(COMMON_CFLAGS)
+test_ec_genpkey_x509_csr_LDADD = $(CRYPTO_LIBS)
+test_ec_genpkey_x509_csr_LDFLAGS = $(COMMON_LDFLAGS)
+
+check_PROGRAMS += test/rsa_genpkey_decrypt
 test_rsa_genpkey_decrypt_SOURCES = test/rsa_genpkey_decrypt.c
 test_rsa_genpkey_decrypt_CFLAGS = $(COMMON_CFLAGS)
 test_rsa_genpkey_decrypt_LDADD = $(CRYPTO_LIBS)

test/ec_genpkey_x509_csr.c

@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#include <openssl/core_names.h>
+#include <openssl/err.h>
+#include <openssl/pem.h>
+#include <openssl/provider.h>
+#include <openssl/x509v3.h>
+
+#define TEST_PASSWORD "secret"
+#define TEST_CSR_FILENAME "ec_genpkey_x509_csr.pem"
+
+int generate_csr(const char *password, const char *filename)
+{
+    OSSL_PARAM params[3];
+    EVP_PKEY_CTX *pctx = NULL;
+    EVP_PKEY *pkey = NULL;
+    X509_REQ *x509 = NULL;
+    X509_NAME *name;
+    STACK_OF(X509_EXTENSION) *exts = NULL;
+    X509_EXTENSION *ex;
+    FILE *csr_file = NULL;
+    int ret = 1;
+
+    // generate new private key
+    if (!(pctx = EVP_PKEY_CTX_new_from_name(NULL, "EC", "provider=tpm2")))
+        goto error1;
+
+    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 error1;
+
+    // prepare a certificate signing request
+    if (!(x509 = X509_REQ_new())
+            || X509_REQ_set_version(x509, X509_REQ_VERSION_1) != 1
+            || X509_REQ_set_pubkey(x509, pkey) != 1)
+        goto error1;
+
+    name = X509_REQ_get_subject_name(x509);
+    if (!X509_NAME_add_entry_by_NID(name, NID_countryName, MBSTRING_ASC, (unsigned char *)"CZ", -1, -1, 0)
+            || !X509_NAME_add_entry_by_NID(name, NID_commonName,  MBSTRING_ASC, "www.example.com", -1, -1, 0))
+        goto error1;
+
+    // set requested extensions
+    if (!(exts = sk_X509_EXTENSION_new_null()))
+        goto error1;
+
+    if (!(ex = X509V3_EXT_nconf_nid(NULL, NULL, NID_basic_constraints, "CA:FALSE"))
+            || !sk_X509_EXTENSION_push(exts, ex))
+        goto error1;
+    if (!(ex = X509V3_EXT_nconf_nid(NULL, NULL, NID_key_usage, "nonRepudiation,digitalSignature,keyEncipherment"))
+            || !sk_X509_EXTENSION_push(exts, ex))
+        goto error1;
+
+    if (X509_REQ_add_extensions(x509, exts) != 1)
+        goto error1;
+
+    // sign the request
+    if (X509_REQ_sign(x509, pkey, EVP_sha256()) <= 0
+            || X509_REQ_check_private_key(x509, pkey) != 1)
+        goto error1;
+
+    // save the result
+    if (!(csr_file = fopen(filename, "w")))
+        goto error1;
+    if (PEM_write_X509_REQ(csr_file, x509) != 1)
+        goto error2;
+
+    ret = 0;
+error2:
+    fclose(csr_file);
+error1:
+    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
+    X509_REQ_free(x509);
+    EVP_PKEY_free(pkey);
+    EVP_PKEY_CTX_free(pctx);
+    return ret;
+}
+
+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_csr(TEST_PASSWORD, TEST_CSR_FILENAME))
+        goto error;
+
+    ret = 0;
+error:
+    ERR_print_errors_fp(stderr);
+
+    remove(TEST_CSR_FILENAME);
+    OSSL_PROVIDER_unload(tpm2prov);
+    OSSL_PROVIDER_unload(defprov);
+    return ret;
+}