diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index 8cc965b09..0d0300dbc 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -633,10 +633,18 @@
  * This macro expands to a compile-time constant integer. This value
  * is the maximum size of a signature in bytes.
  */
-#define PSA_SIGNATURE_MAX_SIZE                               \
-    (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) > PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE ? \
-     PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) :                   \
-     PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE)
+#define PSA_SIGNATURE_MAX_SIZE      1
+
+#if (defined(PSA_WANT_ALG_ECDSA) || defined(PSA_WANT_ALG_DETERMINISTIC_ECDSA)) && \
+    (PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE > PSA_SIGNATURE_MAX_SIZE)
+#undef PSA_SIGNATURE_MAX_SIZE
+#define PSA_SIGNATURE_MAX_SIZE      PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE
+#endif
+#if (defined(PSA_WANT_ALG_RSA_PKCS1V15_SIGN) || defined(PSA_WANT_ALG_RSA_PSS)) && \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) > PSA_SIGNATURE_MAX_SIZE)
+#undef PSA_SIGNATURE_MAX_SIZE
+#define PSA_SIGNATURE_MAX_SIZE      PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS)
+#endif
 
 /** Sufficient output buffer size for psa_asymmetric_encrypt().
  *
@@ -948,10 +956,29 @@
  *
  * See also #PSA_EXPORT_KEY_OUTPUT_SIZE(\p key_type, \p key_bits).
  */
-#define PSA_EXPORT_KEY_PAIR_MAX_SIZE                                                        \
-    PSA_MAX_OF_THREE(PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS),     \
-                     PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS),   \
-                     PSA_KEY_EXPORT_FFDH_KEY_PAIR_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS))
+#define PSA_EXPORT_KEY_PAIR_MAX_SIZE            1
+
+#if defined(PSA_WANT_KEY_TYPE_ECC_KEY_PAIR_BASIC) && \
+    (PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) > \
+     PSA_EXPORT_KEY_PAIR_MAX_SIZE)
+#undef PSA_EXPORT_KEY_PAIR_MAX_SIZE
+#define PSA_EXPORT_KEY_PAIR_MAX_SIZE    \
+    PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+#endif
+#if defined(PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_BASIC) && \
+    (PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) > \
+     PSA_EXPORT_KEY_PAIR_MAX_SIZE)
+#undef PSA_EXPORT_KEY_PAIR_MAX_SIZE
+#define PSA_EXPORT_KEY_PAIR_MAX_SIZE    \
+    PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS)
+#endif
+#if defined(PSA_WANT_KEY_TYPE_DH_KEY_PAIR_BASIC) && \
+    (PSA_KEY_EXPORT_FFDH_KEY_PAIR_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS) > \
+     PSA_EXPORT_KEY_PAIR_MAX_SIZE)
+#undef PSA_EXPORT_KEY_PAIR_MAX_SIZE
+#define PSA_EXPORT_KEY_PAIR_MAX_SIZE    \
+    PSA_KEY_EXPORT_FFDH_KEY_PAIR_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS)
+#endif
 
 /** Sufficient buffer size for exporting any asymmetric public key.
  *
@@ -962,11 +989,29 @@
  *
  * See also #PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(\p key_type, \p key_bits).
  */
-#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE                                                        \
-    PSA_MAX_OF_THREE(PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS),     \
-                     PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS),   \
-                     PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS))
+#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE            1
 
+#if defined(PSA_WANT_KEY_TYPE_ECC_PUBLIC_KEY) && \
+    (PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) > \
+     PSA_EXPORT_PUBLIC_KEY_MAX_SIZE)
+#undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
+#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE    \
+    PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+#endif
+#if defined(PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY) && \
+    (PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) > \
+     PSA_EXPORT_PUBLIC_KEY_MAX_SIZE)
+#undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
+#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE    \
+    PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS)
+#endif
+#if defined(PSA_WANT_KEY_TYPE_DH_PUBLIC_KEY) && \
+    (PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS) > \
+     PSA_EXPORT_PUBLIC_KEY_MAX_SIZE)
+#undef PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
+#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE    \
+    PSA_KEY_EXPORT_FFDH_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_FFDH_MAX_KEY_BITS)
+#endif
 
 /** Sufficient output buffer size for psa_raw_key_agreement().
  *
@@ -1002,11 +1047,18 @@
  *
  * See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(\p key_type, \p key_bits).
  */
-#define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE             \
-    (PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) >   \
-     PSA_BITS_TO_BYTES(PSA_VENDOR_FFDH_MAX_KEY_BITS) ?    \
-     PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) :   \
-     PSA_BITS_TO_BYTES(PSA_VENDOR_FFDH_MAX_KEY_BITS))
+#define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE       1
+
+#if defined(PSA_WANT_ALG_ECDH) && \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) > PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE)
+#undef PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE
+#define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE    PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+#endif
+#if defined(PSA_WANT_ALG_FFDH) && \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_FFDH_MAX_KEY_BITS) > PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE)
+#undef PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE
+#define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE    PSA_BITS_TO_BYTES(PSA_VENDOR_FFDH_MAX_KEY_BITS)
+#endif
 
 /** The default IV size for a cipher algorithm, in bytes.
  *
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index b9dadcff5..b58077ba2 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -1590,7 +1590,11 @@ void import_export(data_t *data,
     TEST_LE_U(exported_length,
               PSA_EXPORT_KEY_OUTPUT_SIZE(type,
                                          psa_get_key_bits(&got_attributes)));
-    TEST_LE_U(exported_length, PSA_EXPORT_KEY_PAIR_MAX_SIZE);
+    if (PSA_KEY_TYPE_IS_KEY_PAIR(type)) {
+        TEST_LE_U(exported_length, PSA_EXPORT_KEY_PAIR_MAX_SIZE);
+    } else if (PSA_KEY_TYPE_IS_PUBLIC_KEY(type)) {
+        TEST_LE_U(exported_length, PSA_EXPORT_PUBLIC_KEY_MAX_SIZE);
+    }
 
 destroy:
     /* Destroy the key */
diff --git a/tests/suites/test_suite_psa_crypto_op_fail.function b/tests/suites/test_suite_psa_crypto_op_fail.function
index 55dce8931..20942bf81 100644
--- a/tests/suites/test_suite_psa_crypto_op_fail.function
+++ b/tests/suites/test_suite_psa_crypto_op_fail.function
@@ -360,7 +360,7 @@ void key_agreement_fail(int key_type_arg, data_t *key_data,
     mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
     uint8_t public_key[PSA_EXPORT_PUBLIC_KEY_MAX_SIZE] = { 0 };
     size_t public_key_length = SIZE_MAX;
-    uint8_t output[PSA_SIGNATURE_MAX_SIZE] = { 0 };
+    uint8_t output[PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE] = { 0 };
     size_t length = SIZE_MAX;
     psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;