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diff --git a/Modules/_sha3/keccak/KeccakSponge.h b/Modules/_sha3/keccak/KeccakSponge.h
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+/*
+The Keccak sponge function, designed by Guido Bertoni, Joan Daemen,
+Michaël Peeters and Gilles Van Assche. For more information, feedback or
+questions, please refer to our website: http://keccak.noekeon.org/
+
+Implementation by the designers,
+hereby denoted as "the implementer".
+
+To the extent possible under law, the implementer has waived all copyright
+and related or neighboring rights to the source code in this file.
+http://creativecommons.org/publicdomain/zero/1.0/
+*/
+
+#ifndef _KeccakSponge_h_
+#define _KeccakSponge_h_
+
+#define KeccakPermutationSize 1600
+#define KeccakPermutationSizeInBytes (KeccakPermutationSize/8)
+#define KeccakMaximumRate 1536
+#define KeccakMaximumRateInBytes (KeccakMaximumRate/8)
+
+#if defined(__GNUC__)
+#define ALIGN __attribute__ ((aligned(32)))
+#elif defined(_MSC_VER)
+#define ALIGN __declspec(align(32))
+#else
+#define ALIGN
+#endif
+
+ALIGN typedef struct spongeStateStruct {
+    ALIGN unsigned char state[KeccakPermutationSizeInBytes];
+    ALIGN unsigned char dataQueue[KeccakMaximumRateInBytes];
+    unsigned int rate;
+    unsigned int capacity;
+    unsigned int bitsInQueue;
+    unsigned int fixedOutputLength;
+    int squeezing;
+    unsigned int bitsAvailableForSqueezing;
+} spongeState;
+
+/**
+  * Function to initialize the state of the Keccak[r, c] sponge function.
+  * The sponge function is set to the absorbing phase.
+  * @param  state       Pointer to the state of the sponge function to be initialized.
+  * @param  rate        The value of the rate r.
+  * @param  capacity    The value of the capacity c.
+  * @pre    One must have r+c=1600 and the rate a multiple of 64 bits in this implementation.
+  * @return Zero if successful, 1 otherwise.
+  */
+static int InitSponge(spongeState *state, unsigned int rate, unsigned int capacity);
+/**
+  * Function to give input data for the sponge function to absorb.
+  * @param  state       Pointer to the state of the sponge function initialized by InitSponge().
+  * @param  data        Pointer to the input data. 
+  *                     When @a databitLen is not a multiple of 8, the last bits of data must be
+  *                     in the least significant bits of the last byte.
+  * @param  databitLen  The number of input bits provided in the input data.
+  * @pre    In the previous call to Absorb(), databitLen was a multiple of 8.
+  * @pre    The sponge function must be in the absorbing phase,
+  *         i.e., Squeeze() must not have been called before.
+  * @return Zero if successful, 1 otherwise.
+  */
+static int Absorb(spongeState *state, const unsigned char *data, unsigned long long databitlen);
+/**
+  * Function to squeeze output data from the sponge function.
+  * If the sponge function was in the absorbing phase, this function 
+  * switches it to the squeezing phase.
+  * @param  state       Pointer to the state of the sponge function initialized by InitSponge().
+  * @param  output      Pointer to the buffer where to store the output data.
+  * @param  outputLength    The number of output bits desired.
+  *                     It must be a multiple of 8.
+  * @return Zero if successful, 1 otherwise.
+  */
+static int Squeeze(spongeState *state, unsigned char *output, unsigned long long outputLength);
+
+#endif