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authorMattias Andrée <maandree@operamail.com>2014-11-04 04:58:47 +0100
committerMattias Andrée <maandree@operamail.com>2014-11-04 04:58:47 +0100
commit6ff80690cb416da00ad70d71cd10a5a0f4735718 (patch)
tree3e0407528b24e6f7af07526ab1efb3f68695eea2 /src
parentm (diff)
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m gitignore + implementation of squeezers
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src')
-rw-r--r--src/libkeccak/digest.c113
-rw-r--r--src/libkeccak/digest.h7
2 files changed, 116 insertions, 4 deletions
diff --git a/src/libkeccak/digest.c b/src/libkeccak/digest.c
new file mode 100644
index 0000000..b6fd215
--- /dev/null
+++ b/src/libkeccak/digest.c
@@ -0,0 +1,113 @@
+/**
+ * libkeccak – Keccak-family hashing library
+ *
+ * Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "digest.h"
+
+
+/**
+ * Absorb the more of the message to the Keccak sponge
+ *
+ * @param state The hashing state
+ * @param msg The partial message
+ * @param msglen The length of the partial message
+ */
+void libkeccak_update(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen)
+{
+}
+
+
+/**
+ * Absorb the last part of the message and squeeze the Keccak sponge
+ *
+ * @param state The hashing state
+ * @param msg The rest of the message, may be `NULL`
+ * @param msglen The length of the partial message
+ * @param bits The number of bits at the end of the message not covered by `msglen`
+ * @param suffix The suffix concatenate to the message
+ * @param hashsum Output paramter for the hashsum, may be `NULL`
+ * @return Zero on success, -1 on error
+ */
+int libkeccak_digest(libkeccak_state_t* restrict state, const char* restrict msg, size_t msglen,
+ size_t bits, const char* restrict suffix, char* restrict hashsum)
+{
+}
+
+
+/**
+ * Force some rounds of Keccak-f
+ *
+ * @param state The hashing state
+ * @param times The number of rounds
+ */
+void libkeccak_simple_squeeze(libkeccak_state_t* restrict state, long times)
+{
+ while (times--)
+ libkeccak_f(state);
+}
+
+
+/**
+ * Squeeze as much as is needed to get a digest a number of times
+ *
+ * @param state The hashing state
+ * @param times The number of digests
+ */
+void libkeccak_fast_squeeze(libkeccak_state_t* restrict state, long times)
+{
+ times *= (state->n - 1) / state->r + 1;
+ while (times--)
+ libkeccak_f(state);
+}
+
+
+/**
+ * Squeeze out another digest
+ *
+ * @param state The hashing state
+ * @param hashsum Output paramter for the hashsum
+ */
+void libkeccak_squeeze(libkeccak_state_t* restrict state, char* restrict hashsum)
+{
+ long ww, nn, olen, i, j, k, ptr, rr, ni;
+ int_fast64_t v;
+
+ libkeccak_f(state);
+
+ ww = state->w >> 3;
+ nn = (state->n + 7) >> 3;
+ olen = state->n;
+ j = ptr = 0;
+ rr = state->r >> 3;
+ ni = rr > 25 ? 25 : rr;
+
+ while (olen > 0)
+ {
+ for (i = 0; (i < ni) && (j < nn); i++)
+ {
+ v = state->S[(i % 5) * 5 + i / 5];
+ for (k = 0; k++ < ww; v >>= 8)
+ if (j++ < nn)
+ hashsum[ptr++] = (char)v;
+ }
+ if (olen -= state->r, olen > 0)
+ libkeccak_f(state);
+ }
+ if (n & 7)
+ n[nn - 1] &= (1 << (n & 7)) - 1;
+}
+
diff --git a/src/libkeccak/digest.h b/src/libkeccak/digest.h
index 4853631..fcd3d50 100644
--- a/src/libkeccak/digest.h
+++ b/src/libkeccak/digest.h
@@ -73,12 +73,11 @@ void libkeccak_fast_squeeze(libkeccak_state_t* restrict state, long times);
/**
* Squeeze out another digest
*
- * @param state The hashing state
- * @param hashsum Output paramter for the hashsum
- * @return Zero on success, -1 on error
+ * @param state The hashing state
+ * @param hashsum Output paramter for the hashsum
*/
__attribute__((nonnull, nothrow))
-int libkeccak_squeeze(libkeccak_state_t* restrict state, char* restrict hashsum);
+void libkeccak_squeeze(libkeccak_state_t* restrict state, char* restrict hashsum);
#undef