diff --git a/library/pkwrite.c b/library/pkwrite.c
index b923c38..c75b48d 100644
--- a/library/pkwrite.c
+++ b/library/pkwrite.c
@@ -37,6 +37,9 @@
 #include "mbedtls/ecp.h"
 #include "mbedtls/platform_util.h"
 #endif
+#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECP_C)
+#include "pkwrite.h"
+#endif
 #if defined(MBEDTLS_ECDSA_C)
 #include "mbedtls/ecdsa.h"
 #endif
@@ -470,84 +473,6 @@
 #define PEM_BEGIN_PRIVATE_KEY_EC    "-----BEGIN EC PRIVATE KEY-----\n"
 #define PEM_END_PRIVATE_KEY_EC      "-----END EC PRIVATE KEY-----\n"
 
-/*
- * Max sizes of key per types. Shown as tag + len (+ content).
- */
-
-#if defined(MBEDTLS_RSA_C)
-/*
- * RSA public keys:
- *  SubjectPublicKeyInfo  ::=  SEQUENCE  {          1 + 3
- *       algorithm            AlgorithmIdentifier,  1 + 1 (sequence)
- *                                                + 1 + 1 + 9 (rsa oid)
- *                                                + 1 + 1 (params null)
- *       subjectPublicKey     BIT STRING }          1 + 3 + (1 + below)
- *  RSAPublicKey ::= SEQUENCE {                     1 + 3
- *      modulus           INTEGER,  -- n            1 + 3 + MPI_MAX + 1
- *      publicExponent    INTEGER   -- e            1 + 3 + MPI_MAX + 1
- *  }
- */
-#define RSA_PUB_DER_MAX_BYTES   ( 38 + 2 * MBEDTLS_MPI_MAX_SIZE )
-
-/*
- * RSA private keys:
- *  RSAPrivateKey ::= SEQUENCE {                    1 + 3
- *      version           Version,                  1 + 1 + 1
- *      modulus           INTEGER,                  1 + 3 + MPI_MAX + 1
- *      publicExponent    INTEGER,                  1 + 3 + MPI_MAX + 1
- *      privateExponent   INTEGER,                  1 + 3 + MPI_MAX + 1
- *      prime1            INTEGER,                  1 + 3 + MPI_MAX / 2 + 1
- *      prime2            INTEGER,                  1 + 3 + MPI_MAX / 2 + 1
- *      exponent1         INTEGER,                  1 + 3 + MPI_MAX / 2 + 1
- *      exponent2         INTEGER,                  1 + 3 + MPI_MAX / 2 + 1
- *      coefficient       INTEGER,                  1 + 3 + MPI_MAX / 2 + 1
- *      otherPrimeInfos   OtherPrimeInfos OPTIONAL  0 (not supported)
- *  }
- */
-#define MPI_MAX_SIZE_2          ( MBEDTLS_MPI_MAX_SIZE / 2 + \
-                                  MBEDTLS_MPI_MAX_SIZE % 2 )
-#define RSA_PRV_DER_MAX_BYTES   ( 47 + 3 * MBEDTLS_MPI_MAX_SIZE \
-                                   + 5 * MPI_MAX_SIZE_2 )
-
-#else /* MBEDTLS_RSA_C */
-
-#define RSA_PUB_DER_MAX_BYTES   0
-#define RSA_PRV_DER_MAX_BYTES   0
-
-#endif /* MBEDTLS_RSA_C */
-
-#if defined(MBEDTLS_ECP_C)
-/*
- * EC public keys:
- *  SubjectPublicKeyInfo  ::=  SEQUENCE  {      1 + 2
- *    algorithm         AlgorithmIdentifier,    1 + 1 (sequence)
- *                                            + 1 + 1 + 7 (ec oid)
- *                                            + 1 + 1 + 9 (namedCurve oid)
- *    subjectPublicKey  BIT STRING              1 + 2 + 1               [1]
- *                                            + 1 (point format)        [1]
- *                                            + 2 * ECP_MAX (coords)    [1]
- *  }
- */
-#define ECP_PUB_DER_MAX_BYTES   ( 30 + 2 * MBEDTLS_ECP_MAX_BYTES )
-
-/*
- * EC private keys:
- * ECPrivateKey ::= SEQUENCE {                  1 + 2
- *      version        INTEGER ,                1 + 1 + 1
- *      privateKey     OCTET STRING,            1 + 1 + ECP_MAX
- *      parameters [0] ECParameters OPTIONAL,   1 + 1 + (1 + 1 + 9)
- *      publicKey  [1] BIT STRING OPTIONAL      1 + 2 + [1] above
- *    }
- */
-#define ECP_PRV_DER_MAX_BYTES   ( 29 + 3 * MBEDTLS_ECP_MAX_BYTES )
-
-#else /* MBEDTLS_ECP_C */
-
-#define ECP_PUB_DER_MAX_BYTES   0
-#define ECP_PRV_DER_MAX_BYTES   0
-
-#endif /* MBEDTLS_ECP_C */
-
 #define PUB_DER_MAX_BYTES   ( RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
                               RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES )
 #define PRV_DER_MAX_BYTES   ( RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \