rsa: rename parse/write functions in order to follow the standard format

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/rsa_internal.h b/library/rsa_internal.h
index 6046850..7bbdc8c 100644
--- a/library/rsa_internal.h
+++ b/library/rsa_internal.h
@@ -28,7 +28,7 @@
  * \return          MBEDTLS_ERR_ASN1_xxx in case of ASN.1 parsing errors.
  * \return          MBEDTLS_ERR_RSA_BAD_INPUT_DATA in case of invalid version.
  */
-int mbedtls_rsa_key_parse(mbedtls_rsa_context *rsa, const unsigned char *key, size_t keylen);
+int mbedtls_rsa_parse_key(mbedtls_rsa_context *rsa, const unsigned char *key, size_t keylen);
 
 /**
  * \brief           Parse a PKCS#1 (ASN.1) encoded public RSA key.
@@ -44,7 +44,7 @@
  * \return          MBEDTLS_ERR_RSA_BAD_INPUT_DATA in case of importing or
  *                  priv/pub validation errors.
  */
-int mbedtls_rsa_pubkey_parse(mbedtls_rsa_context *rsa, unsigned char **p,
+int mbedtls_rsa_parse_pubkey(mbedtls_rsa_context *rsa, unsigned char **p,
                              const unsigned char *end);
 
 /**
@@ -67,7 +67,7 @@
  * \note            The output buffer is filled backward, i.e. starting from its
  *                  end and moving toward its start.
  */
-int mbedtls_rsa_key_write(const mbedtls_rsa_context *rsa, unsigned char *start,
+int mbedtls_rsa_write_key(const mbedtls_rsa_context *rsa, unsigned char *start,
                           unsigned char **p);
 
 /**
@@ -90,7 +90,7 @@
  * \note            The output buffer is filled backward, i.e. starting from its
  *                  end and moving toward its start.
  */
-int mbedtls_rsa_pubkey_write(const mbedtls_rsa_context *rsa, unsigned char *start,
+int mbedtls_rsa_write_pubkey(const mbedtls_rsa_context *rsa, unsigned char *start,
                              unsigned char **p);
 
 #if defined(MBEDTLS_PKCS1_V21)