diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index 45655dd..5016ba8 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -444,6 +444,147 @@
 
 /**@}*/
 
+
+/** \addtogroup attributes
+ * @{
+ */
+
+/**
+ * \brief Set domain parameters for a key.
+ *
+ * Some key types require additional domain parameters in addition to
+ * the key type identifier and the key size. Use this function instead
+ * of psa_set_key_type() when you need to specify domain parameters.
+ *
+ * The format for the required domain parameters varies based on the key type.
+ *
+ * - For RSA keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY or #PSA_KEY_TYPE_RSA_KEYPAIR),
+ *   the domain parameter data consists of the public exponent,
+ *   represented as a big-endian integer with no leading zeros.
+ *   This information is used when generating an RSA key pair.
+ *   When importing a key, the public exponent is read from the imported
+ *   key data and the exponent recorded in the attribute structure is ignored.
+ *   As an exception, the public exponent 65537 is represented by an empty
+ *   byte string.
+ * - For DSA keys (#PSA_KEY_TYPE_DSA_PUBLIC_KEY or #PSA_KEY_TYPE_DSA_KEYPAIR),
+ *   the `Dss-Parms` format as defined by RFC 3279 &sect;2.3.2.
+ *   ```
+ *   Dss-Parms ::= SEQUENCE  {
+ *      p       INTEGER,
+ *      q       INTEGER,
+ *      g       INTEGER
+ *   }
+ *   ```
+ * - For Diffie-Hellman key exchange keys (#PSA_KEY_TYPE_DH_PUBLIC_KEY or
+ *   #PSA_KEY_TYPE_DH_KEYPAIR), the
+ *   `DomainParameters` format as defined by RFC 3279 &sect;2.3.3.
+ *   ```
+ *   DomainParameters ::= SEQUENCE {
+ *      p               INTEGER,                    -- odd prime, p=jq +1
+ *      g               INTEGER,                    -- generator, g
+ *      q               INTEGER,                    -- factor of p-1
+ *      j               INTEGER OPTIONAL,           -- subgroup factor
+ *      validationParms ValidationParms OPTIONAL
+ *   }
+ *   ValidationParms ::= SEQUENCE {
+ *      seed            BIT STRING,
+ *      pgenCounter     INTEGER
+ *   }
+ *   ```
+ *
+ * \note This function may allocate memory or other resources.
+ *       Once you have called this function on an attribute structure,
+ *       you must call psa_reset_key_attributes() to free these resources.
+ *
+ * \note This is an experimental extension to the interface. It may change
+ *       in future versions of the library.
+ *
+ * \param[in,out] attributes    Attribute structure where the specified domain
+ *                              parameters will be stored.
+ *                              If this function fails, the content of
+ *                              \p attributes is not modified.
+ * \param type                  Key type (a \c PSA_KEY_TYPE_XXX value).
+ * \param[in] data              Buffer containing the key domain parameters.
+ *                              The content of this buffer is interpreted
+ *                              according to \p type as described above.
+ * \param data_length           Size of the \p data buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ */
+psa_status_t psa_set_key_domain_parameters(psa_key_attributes_t *attributes,
+                                           psa_key_type_t type,
+                                           const uint8_t *data,
+                                           size_t data_length);
+
+/**
+ * \brief Get domain parameters for a key.
+ *
+ * Get the domain parameters for a key with this function, if any. The format
+ * of the domain parameters written to \p data is specified in the
+ * documentation for psa_set_key_domain_parameters().
+ *
+ * \note This is an experimental extension to the interface. It may change
+ *       in future versions of the library.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ * \param[out] data             On success, the key domain parameters.
+ * \param data_size             Size of the \p data buffer in bytes.
+ *                              The buffer is guaranteed to be large
+ *                              enough if its size in bytes is at least
+ *                              the value given by
+ *                              PSA_KEY_DOMAIN_PARAMETERS_SIZE().
+ * \param[out] data_length      On success, the number of bytes
+ *                              that make up the key domain parameters data.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ */
+psa_status_t psa_get_key_domain_parameters(
+    const psa_key_attributes_t *attributes,
+    uint8_t *data,
+    size_t data_size,
+    size_t *data_length);
+
+/** Safe output buffer size for psa_get_key_domain_parameters().
+ *
+ * This macro returns a compile-time constant if its arguments are
+ * compile-time constants.
+ *
+ * \warning This function may call its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \note This is an experimental extension to the interface. It may change
+ *       in future versions of the library.
+ *
+ * \param key_type  A supported key type.
+ * \param key_bits  The size of the key in bits.
+ *
+ * \return If the parameters are valid and supported, return
+ *         a buffer size in bytes that guarantees that
+ *         psa_get_key_domain_parameters() will not fail with
+ *         #PSA_ERROR_BUFFER_TOO_SMALL.
+ *         If the parameters are a valid combination that is not supported
+ *         by the implementation, this macro either shall return either a
+ *         sensible size or 0.
+ *         If the parameters are not valid, the
+ *         return value is unspecified.
+ */
+#define PSA_KEY_DOMAIN_PARAMETERS_SIZE(key_type, key_bits)              \
+    (PSA_KEY_TYPE_IS_RSA(key_type) ? sizeof(int) :                      \
+     PSA_KEY_TYPE_IS_DH(key_type) ? PSA_DH_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) : \
+     PSA_KEY_TYPE_IS_DSA(key_type) ? PSA_DSA_KEY_DOMAIN_PARAMETERS_SIZE(key_bits) : \
+     0)
+#define PSA_DH_KEY_DOMAIN_PARAMETERS_SIZE(key_bits)     \
+    (4 + (PSA_BITS_TO_BYTES(key_bits) + 5) * 3 /*without optional parts*/)
+#define PSA_DSA_KEY_DOMAIN_PARAMETERS_SIZE(key_bits)    \
+    (4 + (PSA_BITS_TO_BYTES(key_bits) + 5) * 2 /*p, g*/ + 34 /*q*/)
+
+/**@}*/
+
 #ifdef __cplusplus
 }
 #endif