diff --git a/library/pkwrite.c b/library/pkwrite.c
index 8eabd88..d135060 100644
--- a/library/pkwrite.c
+++ b/library/pkwrite.c
@@ -46,6 +46,9 @@
 #include "mbedtls/pem.h"
 #endif
 
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#include "psa/crypto.h"
+#endif
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
@@ -161,6 +164,23 @@
         MBEDTLS_ASN1_CHK_ADD( len, pk_write_ec_pubkey( p, start, mbedtls_pk_ec( *key ) ) );
     else
 #endif
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_OPAQUE )
+    {
+        size_t buffer_size = *p - start;
+        psa_key_slot_t* key_slot = ( psa_key_slot_t* ) key->pk_ctx;
+        if ( psa_export_public_key( *key_slot, start, buffer_size, &len )
+             != PSA_SUCCESS )
+        {
+            return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
+        }
+        else
+        {
+            memmove( *p - len, start, len );
+        }
+    }
+    else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
         return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
 
     return( (int) len );
@@ -177,6 +197,10 @@
 
     MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, key ) );
 
+    if( mbedtls_pk_get_type( key ) == MBEDTLS_PK_OPAQUE )
+    {
+        return( (int) len );
+    }
     if( c - buf < 1 )
         return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );