diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index f182c52..9080cd1 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -433,11 +433,6 @@
 
 #if defined(PSA_WANT_ECC_MONTGOMERY_448)
 #if !defined(MBEDTLS_PSA_ACCEL_ECC_MONTGOMERY_448)
-/*
- * Curve448 is not yet supported via the PSA API in Mbed TLS
- * (https://github.com/ARMmbed/mbedtls/issues/4249).
- */
-#error "Curve448 is not yet supported via the PSA API in Mbed TLS."
 #define MBEDTLS_ECP_DP_CURVE448_ENABLED
 #define MBEDTLS_PSA_BUILTIN_ECC_MONTGOMERY_448 1
 #endif /* !MBEDTLS_PSA_ACCEL_ECC_MONTGOMERY_448 */
@@ -710,8 +705,7 @@
 #define PSA_WANT_ECC_MONTGOMERY_255
 #endif
 
-/* Curve448 is not yet supported via the PSA API (https://github.com/ARMmbed/mbedtls/issues/4249) */
-#if 0 && defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
+#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
 #define MBEDTLS_PSA_BUILTIN_ECC_MONTGOMERY_448 1
 #define PSA_WANT_ECC_MONTGOMERY_448
 #endif
diff --git a/include/psa/crypto_config.h b/include/psa/crypto_config.h
index 3f95d0e..64d8c58 100644
--- a/include/psa/crypto_config.h
+++ b/include/psa/crypto_config.h
@@ -93,12 +93,7 @@
 #define PSA_WANT_ECC_BRAINPOOL_P_R1_384         1
 #define PSA_WANT_ECC_BRAINPOOL_P_R1_512         1
 #define PSA_WANT_ECC_MONTGOMERY_255             1
-/*
- * Curve448 is not yet supported via the PSA API in Mbed TLS
- * (https://github.com/ARMmbed/mbedtls/issues/4249). Thus, do not enable it by
- * default.
- */
-//#define PSA_WANT_ECC_MONTGOMERY_448             1
+#define PSA_WANT_ECC_MONTGOMERY_448             1
 #define PSA_WANT_ECC_SECP_K1_192                1
 /*
  * SECP224K1 is buggy via the PSA API in Mbed TLS
diff --git a/tests/suites/test_suite_psa_crypto.data b/tests/suites/test_suite_psa_crypto.data
index 8671e37..fcf6eaa 100644
--- a/tests/suites/test_suite_psa_crypto.data
+++ b/tests/suites/test_suite_psa_crypto.data
@@ -209,6 +209,22 @@
 depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_255
 import_export_public_key:"70076d0a7318a57d3c16c17251b26645df4c2f87ebc0992ab177fba51db92c6a":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
 
+PSA import/export EC curve448 key pair: good (already properly masked)
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_448
+import_export:"988f4925d1519f5775cf46b04b5800d4ee9ee8bae8bc5565d498c28dd9c9baf574a9419744897391006382a6f127ab1d9ac2d8c0a59872eb":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:448:0:PSA_SUCCESS:1
+
+PSA import/export EC curve448 key pair: unmasked input (check export-import-export yields properly masked output)
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_448
+import_export:"9a8f4925d1519f5775cf46b04b5800d4ee9ee8bae8bc5565d498c28dd9c9baf574a9419744897391006382a6f127ab1d9ac2d8c0a598726b":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:448:0:PSA_SUCCESS:0
+
+PSA import/export-public EC curve448: accept masked input
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_448
+import_export_public_key:"988f4925d1519f5775cf46b04b5800d4ee9ee8bae8bc5565d498c28dd9c9baf574a9419744897391006382a6f127ab1d9ac2d8c0a59872eb":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"9b08f7cc31b7e3e67d22d5aea121074a273bd2b83de09c63faa73d2c22c5d9bbc836647241d953d40c5b12da88120d53177f80e532c41fa0"
+
+PSA import/export-public EC curve448: accept unmasked input
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_448
+import_export_public_key:"9a8f4925d1519f5775cf46b04b5800d4ee9ee8bae8bc5565d498c28dd9c9baf574a9419744897391006382a6f127ab1d9ac2d8c0a598726b":PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):PSA_ALG_ECDH:0:PSA_SUCCESS:"9b08f7cc31b7e3e67d22d5aea121074a273bd2b83de09c63faa73d2c22c5d9bbc836647241d953d40c5b12da88120d53177f80e532c41fa0"
+
 PSA import/export-public: cannot export-public a symmetric key
 depends_on:PSA_WANT_ALG_CBC_NO_PADDING:PSA_WANT_KEY_TYPE_AES:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C
 import_export_public_key:"2b7e151628aed2a6abf7158809cf4f3c":PSA_KEY_TYPE_AES:PSA_ALG_CBC_NO_PADDING:0:PSA_ERROR_INVALID_ARGUMENT:"2b7e151628aed2a6abf7158809cf4f3c"
@@ -229,6 +245,10 @@
 depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_255
 import_export:"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a":PSA_KEY_TYPE_ECC_PUBLIC_KEY(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:255:0:PSA_SUCCESS:1
 
+PSA import/export curve448 Public Key: good
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY:MBEDTLS_PK_PARSE_C:MBEDTLS_PK_WRITE_C:PSA_WANT_ECC_MONTGOMERY_448
+import_export:"9b08f7cc31b7e3e67d22d5aea121074a273bd2b83de09c63faa73d2c22c5d9bbc836647241d953d40c5b12da88120d53177f80e532c41fa0":PSA_KEY_TYPE_ECC_PUBLIC_KEY(PSA_ECC_FAMILY_MONTGOMERY):PSA_KEY_USAGE_EXPORT:PSA_ALG_ECDH:448:0:PSA_SUCCESS:0
+
 PSA import/export AES key: policy forbids export
 depends_on:PSA_WANT_ALG_CTR:PSA_WANT_KEY_TYPE_AES
 import_export:"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa":PSA_KEY_TYPE_AES:PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT:PSA_ALG_CTR:128:0:PSA_ERROR_NOT_PERMITTED:1
@@ -3596,6 +3616,14 @@
 depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:PSA_WANT_ECC_MONTGOMERY_255
 raw_key_agreement:PSA_ALG_ECDH:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):"5dab087e624a8a4b79e17f8b83800ee66f3bb1292618b6fd1c2f8b27ff88e0eb":"8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a":"4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742"
 
+PSA raw key agreement: X448 (RFC 7748: Alice)
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:PSA_WANT_ECC_MONTGOMERY_448
+raw_key_agreement:PSA_ALG_ECDH:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):"9a8f4925d1519f5775cf46b04b5800d4ee9ee8bae8bc5565d498c28dd9c9baf574a9419744897391006382a6f127ab1d9ac2d8c0a598726b":"3eb7a829b0cd20f5bcfc0b599b6feccf6da4627107bdb0d4f345b43027d8b972fc3e34fb4232a13ca706dcb57aec3dae07bdc1c67bf33609":"07fff4181ac6cc95ec1c16a94a0f74d12da232ce40a77552281d282bb60c0b56fd2464c335543936521c24403085d59a449a5037514a879d"
+
+PSA raw key agreement: X448 (RFC 7748: Bob)
+depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:PSA_WANT_ECC_MONTGOMERY_448
+raw_key_agreement:PSA_ALG_ECDH:PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_MONTGOMERY):"1c306a7ac2a0e2e0990b294470cba339e6453772b075811d8fad0d1d6927c120bb5ee8972b0d3e21374c9c921b09d1b0366f10b65173992d":"9b08f7cc31b7e3e67d22d5aea121074a273bd2b83de09c63faa73d2c22c5d9bbc836647241d953d40c5b12da88120d53177f80e532c41fa0":"07fff4181ac6cc95ec1c16a94a0f74d12da232ce40a77552281d282bb60c0b56fd2464c335543936521c24403085d59a449a5037514a879d"
+
 PSA key agreement: ECDH SECP256R1 (RFC 5903) + HKDF-SHA-256: capacity=8160
 depends_on:PSA_WANT_ALG_ECDH:PSA_WANT_ALG_HKDF:PSA_WANT_ALG_SHA_256:PSA_WANT_KEY_TYPE_ECC_KEY_PAIR:MBEDTLS_PK_PARSE_C:PSA_WANT_ECC_SECP_R1_256
 key_agreement_capacity:PSA_ALG_KEY_AGREEMENT(PSA_ALG_ECDH, PSA_ALG_HKDF(PSA_ALG_SHA_256)):PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1):"c88f01f510d9ac3f70a292daa2316de544e9aab8afe84049c62a9c57862d1433":"04d12dfb5289c8d4f81208b70270398c342296970a0bccb74c736fc7554494bf6356fbf3ca366cc23e8157854c13c58d6aac23f046ada30f8353e74f33039872ab":8160