doc crypto: add word on using CFLAGS

RIOT-OS · Feb 11, 2016 · 30ab688 · 30ab688
1 parent a0429f7
commit 30ab688
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/sys/crypto/doc.txt b/sys/crypto/doc.txt
@@ -25,6 +25,12 @@
  * While you can use the ciphers functions directly, you should resort to
  * the generic API for block ciphers whenever possible.
  *
+ * Additionally you need to set a CFLAG for each cipher you want to use in your Makefile:
+ *  * AES-128: CFLAGS += -DCRYPTO_AES
+ *  * 3DES:    CFLAGS += -DCRYPTO_THREEDES
+ *  * Twofish: CFLAGS += -CRYPTO_TWOFISH
+ * This sets the appropriate buffer sizes for cipher operations.
+ *
  * Example:
  * @code
  *  #include "crypto/ciphers.h"