KawPow WIP

src/base/crypto/sha3.h

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+#ifndef SHA3_H
+#define SHA3_H
+
+/* -------------------------------------------------------------------------
+ * Works when compiled for either 32-bit or 64-bit targets, optimized for 
+ * 64 bit.
+ *
+ * Canonical implementation of Init/Update/Finalize for SHA-3 byte input. 
+ *
+ * SHA3-256, SHA3-384, SHA-512 are implemented. SHA-224 can easily be added.
+ *
+ * Based on code from http://keccak.noekeon.org/ .
+ *
+ * I place the code that I wrote into public domain, free to use. 
+ *
+ * I would appreciate if you give credits to this work if you used it to 
+ * write or test * your code.
+ *
+ * Aug 2015. Andrey Jivsov. crypto@brainhub.org
+ * ---------------------------------------------------------------------- */
+
+/* 'Words' here refers to uint64_t */
+#define SHA3_KECCAK_SPONGE_WORDS \
+	(((1600)/8/*bits to byte*/)/sizeof(uint64_t))
+typedef struct sha3_context_ {
+    uint64_t saved;             /* the portion of the input message that we
+                                 * didn't consume yet */
+    union {                     /* Keccak's state */
+        uint64_t s[SHA3_KECCAK_SPONGE_WORDS];
+        uint8_t sb[SHA3_KECCAK_SPONGE_WORDS * 8];
+    };
+    unsigned byteIndex;         /* 0..7--the next byte after the set one
+                                 * (starts from 0; 0--none are buffered) */
+    unsigned wordIndex;         /* 0..24--the next word to integrate input
+                                 * (starts from 0) */
+    unsigned capacityWords;     /* the double size of the hash output in
+                                 * words (e.g. 16 for Keccak 512) */
+} sha3_context;
+
+enum SHA3_FLAGS {
+    SHA3_FLAGS_NONE=0,
+    SHA3_FLAGS_KECCAK=1
+};
+
+enum SHA3_RETURN {
+    SHA3_RETURN_OK=0,
+    SHA3_RETURN_BAD_PARAMS=1
+};
+typedef enum SHA3_RETURN sha3_return_t;
+
+/* For Init or Reset call these: */
+sha3_return_t sha3_Init(void *priv, unsigned bitSize);
+
+void sha3_Init256(void *priv);
+void sha3_Init384(void *priv);
+void sha3_Init512(void *priv);
+
+enum SHA3_FLAGS sha3_SetFlags(void *priv, enum SHA3_FLAGS);
+
+void sha3_Update(void *priv, void const *bufIn, size_t len);
+
+void const *sha3_Finalize(void *priv);
+
+/* Single-call hashing */
+#ifdef __cplusplus
+extern "C"
+#endif
+sha3_return_t sha3_HashBuffer( 
+    unsigned bitSize,   /* 256, 384, 512 */
+    enum SHA3_FLAGS flags, /* SHA3_FLAGS_NONE or SHA3_FLAGS_KECCAK */
+    const void *in, unsigned inBytes, 
+    void *out, unsigned outBytes );     /* up to bitSize/8; truncation OK */
+#endif