Fix documentation bug on necessity of RNG in RSA PKCS v1.5
@@ -588,12 +588,12 @@ int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
- * \param f_rng The RNG to use. If PKCS#1 v2.1 padding encoding is
- * used, this must be provided. Additionally, it is
- * used for blinding if \p mode is #MBEDTLS_RSA_PRIVATE
- * and should be provided in this case; see
- * mbedtls_rsa_private() for more. It is ignored
- * for PKCS#1 v1.5 padding with #MBEDTLS_RSA_PUBLIC.
+ * \param f_rng The RNG to use. It is mandatory for PKCS#1 v2.1 padding
+ * encoding, and for PKCS#1 v1.5 padding encoding when used
+ * with \p mode set to #MBEDTLS_RSA_PUBLIC. For PKCS#1 v1.5
+ * padding encoding and \p mode set to #MBEDTLS_RSA_PRIVATE,
+ * it is used for blinding and should be provided in this
+ * case; see mbedtls_rsa_private() for more.
* \param p_rng The RNG context to be passed to \p f_rng. May be
* \c NULL if \p f_rng is \c NULL or if \p f_rng doesn't
* need a context argument.
