Forbid passing NULL input buffers to RSA encryption routines

library/rsa.c

diff --git a/library/rsa.c b/library/rsa.c
index 154738f..86bec64 100644
--- a/library/rsa.c
+++ b/library/rsa.c
@@ -1135,7 +1135,7 @@
     RSA_VALIDATE_RET( mode == MBEDTLS_RSA_PRIVATE ||
                       mode == MBEDTLS_RSA_PUBLIC );
     RSA_VALIDATE_RET( output != NULL );
-    RSA_VALIDATE_RET( ilen == 0 || input != NULL );
+    RSA_VALIDATE_RET( input != NULL );
     RSA_VALIDATE_RET( label_len == 0 || label != NULL );
 
     if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
@@ -1218,7 +1218,7 @@
     RSA_VALIDATE_RET( mode == MBEDTLS_RSA_PRIVATE ||
                       mode == MBEDTLS_RSA_PUBLIC );
     RSA_VALIDATE_RET( output != NULL );
-    RSA_VALIDATE_RET( ilen == 0 || input != NULL );
+    RSA_VALIDATE_RET( input != NULL );
 
     if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
         return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
@@ -1285,7 +1285,7 @@
     RSA_VALIDATE_RET( mode == MBEDTLS_RSA_PRIVATE ||
                       mode == MBEDTLS_RSA_PUBLIC );
     RSA_VALIDATE_RET( output != NULL );
-    RSA_VALIDATE_RET( ilen == 0 || input != NULL );
+    RSA_VALIDATE_RET( input != NULL );
 
     switch( ctx->padding )
     {