diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 257903c..bf61706 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1003,6 +1003,38 @@
 	$(OPENSSL) ec -pubin -in $< -out $@ -conv_form compressed
 all_final += ec_bp512_pub.comp.pem
 
+ec_x25519_prv.der:
+	$(OPENSSL) genpkey -algorithm X25519 -out $@ -outform DER
+all_final += ec_x25519_prv.der
+
+ec_x25519_pub.der: ec_x25519_pub.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER
+all_final += ec_x25519_pub.der
+
+ec_x25519_prv.pem: ec_x25519_prv.pem
+	$(OPENSSL) pkey -in $< -inform DER -out $@
+all_final += ec_x25519_prv.pem
+
+ec_x25519_pub.pem: ec_x25519_pub.pem
+	$(OPENSSL) pkey -in $< -inform DER -out $@
+all_final += ec_x25519_pub.pem
+
+ec_x448_prv.der:
+	$(OPENSSL) genpkey -algorithm X448 -out $@ -outform DER
+all_final += ec_x448_prv.der
+
+ec_x448_pub.der: ec_x448_pub.der
+	$(OPENSSL) pkey -in $< -inform DER -out $@ -outform DER
+all_final += ec_x448_pub.der
+
+ec_x448_prv.pem: ec_x448_prv.pem
+	$(OPENSSL) pkey -in $< -inform DER -out $@
+all_final += ec_x448_prv.pem
+
+ec_x448_pub.pem: ec_x448_pub.pem
+	$(OPENSSL) pkey -in $< -inform DER -out $@
+all_final += ec_x448_pub.pem
+
 ################################################################
 #### Convert PEM keys to DER format
 ################################################################
diff --git a/tests/data_files/ec_x25519_prv.der b/tests/data_files/ec_x25519_prv.der
new file mode 100644
index 0000000..ea23733
--- /dev/null
+++ b/tests/data_files/ec_x25519_prv.der
Binary files differ
diff --git a/tests/data_files/ec_x25519_prv.pem b/tests/data_files/ec_x25519_prv.pem
new file mode 100644
index 0000000..0072240
--- /dev/null
+++ b/tests/data_files/ec_x25519_prv.pem
@@ -0,0 +1,3 @@
+-----BEGIN PRIVATE KEY-----
+MC4CAQAwBQYDK2VuBCIEILBtgpZVVDpRy6NuU1IrwKz9YK9ZRmVV+z4eeWhyqxpZ
+-----END PRIVATE KEY-----
diff --git a/tests/data_files/ec_x25519_pub.der b/tests/data_files/ec_x25519_pub.der
new file mode 100644
index 0000000..922cb76
--- /dev/null
+++ b/tests/data_files/ec_x25519_pub.der
Binary files differ
diff --git a/tests/data_files/ec_x25519_pub.pem b/tests/data_files/ec_x25519_pub.pem
new file mode 100644
index 0000000..2a36b5b
--- /dev/null
+++ b/tests/data_files/ec_x25519_pub.pem
@@ -0,0 +1,3 @@
+-----BEGIN PUBLIC KEY-----
+MCowBQYDK2VuAyEAm8Ow6T2CM/5qi6YTiUjMEqkTYtXC7YFYTbBatUGcnRE=
+-----END PUBLIC KEY-----
diff --git a/tests/data_files/ec_x448_prv.der b/tests/data_files/ec_x448_prv.der
new file mode 100644
index 0000000..f6d52f7
--- /dev/null
+++ b/tests/data_files/ec_x448_prv.der
Binary files differ
diff --git a/tests/data_files/ec_x448_prv.pem b/tests/data_files/ec_x448_prv.pem
new file mode 100644
index 0000000..7bca661
--- /dev/null
+++ b/tests/data_files/ec_x448_prv.pem
@@ -0,0 +1,4 @@
+-----BEGIN PRIVATE KEY-----
+MEYCAQAwBQYDK2VvBDoEOGTpCDYD9atLDMYwDnjdwUTkjO4ZMB/uacXKw+4iUiED
+oe50tXsIxi5REqWe2YOoL7eD7npOGRPt
+-----END PRIVATE KEY-----
diff --git a/tests/data_files/ec_x448_pub.der b/tests/data_files/ec_x448_pub.der
new file mode 100644
index 0000000..7c44c91
--- /dev/null
+++ b/tests/data_files/ec_x448_pub.der
Binary files differ
diff --git a/tests/data_files/ec_x448_pub.pem b/tests/data_files/ec_x448_pub.pem
new file mode 100644
index 0000000..306e10c
--- /dev/null
+++ b/tests/data_files/ec_x448_pub.pem
@@ -0,0 +1,4 @@
+-----BEGIN PUBLIC KEY-----
+MEIwBQYDK2VvAzkAlrVhn5KDNBt3nL38B9mqGKqrPwnah3ynJgaWQ5IcLzv6zZT+
+TIjhGQ1NFGWwgtOV8UqU2tO4pYQ=
+-----END PUBLIC KEY-----
diff --git a/tests/suites/test_suite_pkparse.data b/tests/suites/test_suite_pkparse.data
index 3a53dc0..1bd1af2 100644
--- a/tests/suites/test_suite_pkparse.data
+++ b/tests/suites/test_suite_pkparse.data
@@ -974,6 +974,22 @@
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_BP512R1_ENABLED
 pk_parse_public_keyfile_ec:"data_files/ec_bp512_pub.comp.pem":0
 
+Parse Public EC Key #10 (RFC 8410, DER, X25519)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_parse_public_keyfile_ec:"data_files/ec_x25519_pub.der":0
+
+Parse Public EC Key #11 (RFC 8410, DER, X448)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_parse_public_keyfile_ec:"data_files/ec_x448_pub.der":0
+
+Parse Public EC Key #12 (RFC 8410, PEM, X25519)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_parse_public_keyfile_ec:"data_files/ec_x25519_pub.pem":0
+
+Parse Public EC Key #13 (RFC 8410, PEM, X448)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_parse_public_keyfile_ec:"data_files/ec_x448_pub.pem":0
+
 Parse EC Key #1 (SEC1 DER)
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_SECP192R1_ENABLED
 pk_parse_keyfile_ec:"data_files/ec_prv.sec1.der":"NULL":0
@@ -1082,6 +1098,22 @@
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_SECP256K1_ENABLED:MBEDTLS_PK_PARSE_EC_EXTENDED
 pk_parse_keyfile_ec:"data_files/ec_prv.specdom.der":"NULL":0
 
+Parse EC Key #16 (RFC 8410, DER, X25519)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_parse_keyfile_ec:"data_files/ec_x25519_prv.der":"NULL":0
+
+Parse EC Key #17 (RFC 8410, DER, X448)
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_parse_keyfile_ec:"data_files/ec_x448_prv.der":"NULL":0
+
+Parse EC Key #18 (RFC 8410, PEM, X25519)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_parse_keyfile_ec:"data_files/ec_x25519_prv.pem":"NULL":0
+
+Parse EC Key #19 (RFC 8410, PEM, X448)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_parse_keyfile_ec:"data_files/ec_x448_prv.pem":"NULL":0
+
 Key ASN1 (No data)
 pk_parse_key:"":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
 
@@ -1163,3 +1195,30 @@
 Key ASN1 (ECPrivateKey, empty parameters)
 depends_on:MBEDTLS_ECP_LIGHT
 pk_parse_key:"30070201010400a000":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, doesn't match masking requirements, from RFC8410 Appendix A but made into version 0)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"302e020100300506032b656e04220420f8ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff3f":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, with invalid optional AlgorithIdentifier parameters)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"3030020100300706032b656e050004220420b06d829655543a51cba36e53522bc0acfd60af59466555fb3e1e796872ab1a59":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, with NULL private key)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"300e020100300506032b656e04020500":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey with invalid AlgorithIdentifier)
+pk_parse_key:"3013020100300a06082b0601040181fd5904020500":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, with unsupported attributes)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"304f020100300506032b656e04220420b06d829655543a51cba36e53522bc0acfd60af59466555fb3e1e796872ab1a59a01f301d060a2a864886f70d01090914310f0c0d437572646c6520436861697273":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, unsupported version 2 with public key)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"3051020101300506032b656e04220420b06d829655543a51cba36e53522bc0acfd60af59466555fb3e1e796872ab1a598121009bc3b0e93d8233fe6a8ba6138948cc12a91362d5c2ed81584db05ab5419c9d11":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
+
+Key ASN1 (OneAsymmetricKey X25519, unsupported version 2 with public key and unsupported attributes)
+depends_on:MBEDTLS_ECP_LIGHT
+pk_parse_key:"3072020101300506032b656e04220420b06d829655543a51cba36e53522bc0acfd60af59466555fb3e1e796872ab1a59a01f301d060a2a864886f70d01090914310f0c0d437572646c65204368616972738121009bc3b0e93d8233fe6a8ba6138948cc12a91362d5c2ed81584db05ab5419c9d11":MBEDTLS_ERR_PK_KEY_INVALID_FORMAT
diff --git a/tests/suites/test_suite_pkwrite.data b/tests/suites/test_suite_pkwrite.data
index 34bf0da..33f1b06 100644
--- a/tests/suites/test_suite_pkwrite.data
+++ b/tests/suites/test_suite_pkwrite.data
@@ -38,6 +38,14 @@
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_BP512R1_ENABLED
 pk_write_pubkey_check:"data_files/ec_bp512_pub.der":TEST_DER
 
+Public key write check EC X25519
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_write_pubkey_check:"data_files/ec_x25519_pub.pem":TEST_PEM
+
+Public key write check EC X448
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_write_pubkey_check:"data_files/ec_x448_pub.pem":TEST_PEM
+
 Private key write check RSA
 depends_on:MBEDTLS_RSA_C:MBEDTLS_PEM_PARSE_C:MBEDTLS_PEM_WRITE_C
 pk_write_key_check:"data_files/server1.key":TEST_PEM
@@ -113,3 +121,11 @@
 Derive public key EC Brainpool 512 bits
 depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_ECP_DP_BP512R1_ENABLED
 pk_write_public_from_private:"data_files/ec_bp512_prv.der":"data_files/ec_bp512_pub.der"
+
+Private key write check EC X25519
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE25519_ENABLED
+pk_write_key_check:"data_files/ec_x25519_prv.pem":TEST_PEM
+
+Private key write check EC X448
+depends_on:MBEDTLS_ECP_LIGHT:MBEDTLS_BASE64_C:MBEDTLS_ECP_DP_CURVE448_ENABLED
+pk_write_key_check:"data_files/ec_x448_prv.pem":TEST_PEM