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doc crypto: add word on using required CFLAGS
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@ -25,6 +25,13 @@
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* While you can use the ciphers functions directly, you should resort to
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* the generic API for block ciphers whenever possible.
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*
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* Additionally you need to set a CFLAG for each cipher you want to use in your Makefile:
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* * AES-128: CFLAGS += -DCRYPTO_AES
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* * 3DES: CFLAGS += -DCRYPTO_THREEDES
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* * Twofish: CFLAGS += -DCRYPTO_TWOFISH
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* Setting the CFLAGS initializes a sufficient large buffer size of the cipher_context_t,
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* used by the ciphers for en-/de-cryption operations.
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*
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* Example:
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* @code
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* #include "crypto/ciphers.h"
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