initial import

2012-10-03 15:05:19 +09:00
commit d9d541dce8
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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/
+*/
+
+#include <string.h>
+#include "KeccakNISTInterface.h"
+#include "KeccakF-1600-interface.h"
+
+HashReturn Init(hashState *state, int hashbitlen)
+{
+    switch(hashbitlen) {
+        case 0: // Default parameters, arbitrary length output
+            InitSponge((spongeState*)state, 1024, 576);
+            break;
+        case 224:
+            InitSponge((spongeState*)state, 1152, 448);
+            break;
+        case 256:
+            InitSponge((spongeState*)state, 1088, 512);
+            break;
+        case 384:
+            InitSponge((spongeState*)state, 832, 768);
+            break;
+        case 512:
+            InitSponge((spongeState*)state, 576, 1024);
+            break;
+        default:
+            return BAD_HASHLEN;
+    }
+    state->fixedOutputLength = hashbitlen;
+    return SUCCESS;
+}
+
+HashReturn Update(hashState *state, const BitSequence *data, DataLength databitlen)
+{
+    if ((databitlen % 8) == 0)
+        return Absorb((spongeState*)state, data, databitlen);
+    else {
+        HashReturn ret = Absorb((spongeState*)state, data, databitlen - (databitlen % 8));
+        if (ret == SUCCESS) {
+            unsigned char lastByte; 
+            // Align the last partial byte to the least significant bits
+            lastByte = data[databitlen/8] >> (8 - (databitlen % 8));
+            return Absorb((spongeState*)state, &lastByte, databitlen % 8);
+        }
+        else
+            return ret;
+    }
+}
+
+HashReturn Final(hashState *state, BitSequence *hashval)
+{
+    return Squeeze(state, hashval, state->fixedOutputLength);
+}
+
+HashReturn Hash(int hashbitlen, const BitSequence *data, DataLength databitlen, BitSequence *hashval)
+{
+    hashState state;
+    HashReturn result;
+
+    if ((hashbitlen != 224) && (hashbitlen != 256) && (hashbitlen != 384) && (hashbitlen != 512))
+        return BAD_HASHLEN; // Only the four fixed output lengths available through this API
+    result = Init(&state, hashbitlen);
+    if (result != SUCCESS)
+        return result;
+    result = Update(&state, data, databitlen);
+    if (result != SUCCESS)
+        return result;
+    result = Final(&state, hashval);
+    return result;
+}
+