psa_util: update documentation for mbedtls_ecdsa_raw_to_der()
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index a5f09a4..984f031 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -192,12 +192,13 @@
* PSA_BITS_TO_BYTES(bits) bytes.
* \param[out] der Buffer that will be filled with the converted DER
* output. It can overlap with raw buffer.
- * \param der_size Size of \p der in bytes. Given \p bits parameter:
- * * #MBEDTLS_ECDSA_MAX_SIG_LEN(\p bits) can be used
- * to determine a large enough buffer for any
- * \p raw input vector.
- * * The minimum size might be smaller in case
- * \p raw input vector contains padding zeros.
+ * \param der_size Size of \p der in bytes. It is enough if \p der_size
+ * is at least the size of the actual output. (The size
+ * of the output can vary depending on the presence of
+ * leading zeros in the data.) You can use
+ * #MBEDTLS_ECDSA_MAX_SIG_LEN(\p bits) to determine a
+ * size that is large enough for all signatures for a
+ * given value of \p bits.
* \param[out] der_len On success it contains the amount of valid data
* (in bytes) written to \p der. It's undefined
* in case of failure.