diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index b144a42..715d036 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -2163,75 +2163,9 @@
 
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
 
-static inline int mbedtls_ssl_tls13_check_sig_alg_cert_key_match(
+int mbedtls_ssl_tls13_check_sig_alg_cert_key_match(
                 uint16_t sig_alg,
-                mbedtls_pk_context *key)
-{
-    mbedtls_pk_type_t pk_type = mbedtls_ssl_sig_from_pk( key );
-    size_t key_size = mbedtls_pk_get_bitlen( key );
-
-    switch( pk_type )
-    {
-#if defined(MBEDTLS_ECDSA_C)
-        case MBEDTLS_SSL_SIG_ECDSA:
-            switch( key_size )
-            {
-#if defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
-                case 256:
-                    return(
-                        sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP256R1_SHA256 );
-#endif /* MBEDTLS_SHA256_C && MBEDTLS_ECP_DP_SECP256R1_ENABLED */
-
-#if defined(MBEDTLS_SHA384_C) && defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
-                case 384:
-                    return(
-                        sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP384R1_SHA384 );
-#endif /* MBEDTLS_SHA384_C && MBEDTLS_ECP_DP_SECP384R1_ENABLED */
-
-#if defined(MBEDTLS_SHA512_C) && defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
-                case 521:
-                    return(
-                        sig_alg == MBEDTLS_TLS1_3_SIG_ECDSA_SECP521R1_SHA512 );
-#endif /* MBEDTLS_SHA512_C && MBEDTLS_ECP_DP_SECP521R1_ENABLED */
-                default:
-                    break;
-            }
-            break;
-#endif /* MBEDTLS_ECDSA_C */
-
-#if defined(MBEDTLS_RSA_C)
-        case MBEDTLS_SSL_SIG_RSA:
-            switch( sig_alg )
-            {
-#if defined(MBEDTLS_PKCS1_V21)
-#if defined(MBEDTLS_SHA256_C)
-                case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256:
-                    return( key_size <= 2048 );
-#endif /* MBEDTLS_SHA256_C */
-
-#if defined(MBEDTLS_SHA384_C)
-                case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA384:
-                    return( key_size <= 3072 );
-#endif /* MBEDTLS_SHA384_C */
-
-#if defined(MBEDTLS_SHA512_C)
-                case MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA512:
-                    return( key_size <= 4096 );
-#endif /* MBEDTLS_SHA512_C */
-#endif /* MBEDTLS_PKCS1_V21 */
-
-                default:
-                    break;
-            }
-            break;
-#endif /* MBEDTLS_RSA_C */
-
-        default:
-            break;
-    }
-
-    return( 0 );
-}
+                mbedtls_pk_context *key);
 
 #endif /* MBEDTLS_SSL_PROTO_TLS1_3 */