diff --git a/tests/data_files/server1.req.cert_type b/tests/data_files/server1.req.cert_type
new file mode 100644
index 0000000..5677f32
--- /dev/null
+++ b/tests/data_files/server1.req.cert_type
@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/server1.req.key_usage b/tests/data_files/server1.req.key_usage
new file mode 100644
index 0000000..053aed9
--- /dev/null
+++ b/tests/data_files/server1.req.key_usage
@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/server1.req.ku-ct b/tests/data_files/server1.req.ku-ct
new file mode 100644
index 0000000..0e057d5
--- /dev/null
+++ b/tests/data_files/server1.req.ku-ct
@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE REQUEST-----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+-----END CERTIFICATE REQUEST-----
diff --git a/tests/data_files/server5.req.ku.sha1 b/tests/data_files/server5.req.ku.sha1
new file mode 100644
index 0000000..7556d1a
--- /dev/null
+++ b/tests/data_files/server5.req.ku.sha1
@@ -0,0 +1,8 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIIBFjCBvAIBADA8MQswCQYDVQQGEwJOTDERMA8GA1UEChMIUG9sYXJTU0wxGjAY
+BgNVBAMTEVBvbGFyU1NMIFNlcnZlciAxMFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcD
+QgAEN8xW2XYJHlpyPsdZLf8gbu58+QaRdNCtFLX3aCJZYpJO5QDYIxH/6i/SNF1d
+Fr2KiMJrdw1VzYoqDvoByLTt/6AeMBwGCSqGSIb3DQEJDjEPMA0wCwYDVR0PBAQD
+AgHAMAsGByqGSM49BAEFAANIADBFAiBjnnD7nwsFnCL+MpPPFJE3K/Tgj+5rAgXj
+e5UejDX2CAIhAKdbigWJL/ZatvG9CFHq7ykrRns2x8JEXehWu8DsXdx9
+-----END CERTIFICATE REQUEST-----
diff --git a/tests/suites/test_suite_x509write.data b/tests/suites/test_suite_x509write.data
index 1b2754e..fdc7232 100644
--- a/tests/suites/test_suite_x509write.data
+++ b/tests/suites/test_suite_x509write.data
@@ -1,30 +1,46 @@
 Certificate Request check Server1 SHA1
 depends_on:POLARSSL_SHA1_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_SHA1:"data_files/server1.req.sha1"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.sha1":POLARSSL_MD_SHA1:0:0
 
 Certificate Request check Server1 SHA224
 depends_on:POLARSSL_SHA256_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_SHA224:"data_files/server1.req.sha224"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.sha224":POLARSSL_MD_SHA224:0:0
 
 Certificate Request check Server1 SHA256
 depends_on:POLARSSL_SHA256_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_SHA256:"data_files/server1.req.sha256"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.sha256":POLARSSL_MD_SHA256:0:0
 
 Certificate Request check Server1 SHA384
 depends_on:POLARSSL_SHA512_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_SHA384:"data_files/server1.req.sha384"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.sha384":POLARSSL_MD_SHA384:0:0
 
 Certificate Request check Server1 SHA512
 depends_on:POLARSSL_SHA512_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_SHA512:"data_files/server1.req.sha512"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.sha512":POLARSSL_MD_SHA512:0:0
 
 Certificate Request check Server1 MD4
 depends_on:POLARSSL_MD4_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_MD4:"data_files/server1.req.md4"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.md4":POLARSSL_MD_MD4:0:0
 
 Certificate Request check Server1 MD5
 depends_on:POLARSSL_MD5_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
-x509_csr_check:"data_files/server1.key":POLARSSL_MD_MD5:"data_files/server1.req.md5"
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.md5":POLARSSL_MD_MD5:0:0
+
+Certificate Request check Server1 key_usage
+depends_on:POLARSSL_SHA1_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.key_usage":POLARSSL_MD_SHA1:KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION | KU_KEY_ENCIPHERMENT:0
+
+Certificate Request check Server1 ns_cert_type
+depends_on:POLARSSL_SHA1_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.cert_type":POLARSSL_MD_SHA1:0:NS_CERT_TYPE_SSL_SERVER
+
+Certificate Request check Server1 key_usage + ns_cert_type
+depends_on:POLARSSL_SHA1_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15
+x509_csr_check:"data_files/server1.key":"data_files/server1.req.ku-ct":POLARSSL_MD_SHA1:KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION | KU_KEY_ENCIPHERMENT:NS_CERT_TYPE_SSL_SERVER
+
+Certificate Request check Server5 ECDSA, key_usage
+depends_on:POLARSSL_SHA1_C:POLARSSL_ECDSA_C:POLARSSL_ECDSA_DETERMINISTIC
+x509_csr_check:"data_files/server5.key":"data_files/server5.req.ku.sha1":POLARSSL_MD_SHA1:KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION:0
 
 Certificate write check Server1 SHA1
 depends_on:POLARSSL_SHA1_C:POLARSSL_RSA_C:POLARSSL_PKCS1_V15:POLARSSL_DES_C:POLARSSL_CIPHER_MODE_CBC:POLARSSL_MD5_C
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index ca097e7..e205519 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -11,8 +11,8 @@
  */
 
 /* BEGIN_CASE depends_on:POLARSSL_PEM_WRITE_C:POLARSSL_X509_CSR_WRITE_C */
-void x509_csr_check( char *key_file, int md_type,
-                          char *cert_req_check_file )
+void x509_csr_check( char *key_file, char *cert_req_check_file,
+                     int md_type, int key_usage, int cert_type )
 {
     pk_context key;
     x509write_csr req;
@@ -33,6 +33,10 @@
     x509write_csr_set_md_alg( &req, md_type );
     x509write_csr_set_key( &req, &key );
     TEST_ASSERT( x509write_csr_set_subject_name( &req, subject_name ) == 0 );
+    if( key_usage != 0 )
+        TEST_ASSERT( x509write_csr_set_key_usage( &req, key_usage ) == 0 );
+    if( cert_type != 0 )
+        TEST_ASSERT( x509write_csr_set_ns_cert_type( &req, cert_type ) == 0 );
 
     ret = x509write_csr_pem( &req, buf, sizeof(buf),
                              rnd_pseudo_rand, &rnd_info );