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-rw-r--r--java-c-jni/SHA3.c140
1 files changed, 119 insertions, 21 deletions
diff --git a/java-c-jni/SHA3.c b/java-c-jni/SHA3.c
index f9dd01d..57feaee 100644
--- a/java-c-jni/SHA3.c
+++ b/java-c-jni/SHA3.c
@@ -34,8 +34,6 @@
#define false 0
-#define min(X, Y) ((X) < (Y) ? (X) : (Y))
-
/**
* Round contants
@@ -121,6 +119,18 @@ static long mptr = 0;
static long mlen = 0;
+
+/**
+ * Gets the smallest, in value, of the arguments
+ *
+ * @param X The first candidate
+ * @param Y The second candidate
+ * @return The lowest candidate
+ */
+#define min(X, Y) ((X) < (Y) ? (X) : (Y))
+
+
+
/**
* Copy an array segment into an array in start to end order
*
@@ -549,9 +559,10 @@ void update(byte* msg, jint msglen)
{
long rr = r >> 3;
long ww = w >> 3;
- long i, len, nnn;
+ long i, len;
byte* message;
byte* _msg;
+ long nnn;
if (mptr + msglen > mlen)
{
@@ -606,18 +617,21 @@ void update(byte* msg, jint msglen)
/**
* Absorb the last part of the message and squeeze the Keccak sponge
*
- * @param msg The rest of the message, may be {@code null}
- * @param msglen The length of the partial message
+ * @param msg The rest of the message, may be {@code null}
+ * @param msglen The length of the partial message
+ * @param withReturn Whether to return the hash instead of just do a quick squeeze phrase and return {@code null}
+ * @return The hash sum, or {@code null} if <tt>withReturn</tt> is {@code false}
*/
-byte* digest(byte* msg, jint msglen)
+byte* digest(byte* msg, jint msglen, boolean withReturn)
{
byte* message;
byte* rc;
byte* _msg;
- long rr = r >> 3, len, nnn;
+ long rr = r >> 3, len;
long nn = (n + 7) >> 3, olen;
long ww = w >> 3, ni;
long i, j = 0, ptr = 0, _;
+ long nnn;
if ((msg == null) || (msglen == 0))
message = pad10star1(M, mptr, r, &len);
@@ -636,8 +650,8 @@ byte* digest(byte* msg, jint msglen)
free(M);
M = null;
rc = (byte*)malloc((n + 7) >> 3);
- nnn = len;
_msg = message;
+ nnn = len;
/* Absorbing phase */
if (ww == 8)
@@ -673,17 +687,98 @@ byte* digest(byte* msg, jint msglen)
/* Squeezing phase */
olen = n;
- ni = min(25, rr);
+ if (withReturn)
+ {
+ ni = min(25, rr);
+ while (olen > 0)
+ {
+ i = 0;
+ while ((i < ni) && (j < nn))
+ {
+ llong v = S[(i % 5) * 5 + i / 5];
+ for (_ = 0; _ < ww; _++)
+ {
+ if (j < nn)
+ rc[ptr++] = (byte)v;
+ v >>= 8;
+ j += 1;
+ }
+ i += 1;
+ }
+ olen -= r;
+ if (olen > 0)
+ keccakF(S);
+ }
+ if ((n & 7))
+ rc[n >> 3] &= (1 << (n & 7)) - 1;
+
+ return rc;
+ }
+ while ((olen -= r) > 0)
+ keccakF(S);
+ return null;
+}
+
+
+/**
+ * Force some rounds of Keccak-f
+ *
+ * @param times The number of rounds
+ */
+void simpleSqueeze(long times)
+{
+ long i;
+ for (i = 0; i < times; i++)
+ keccakF(S);
+}
+
+
+/**
+ * Squeeze as much as is needed to get a digest a number of times
+ *
+ * @param times The number of digests
+ */
+void fastSqueeze(long times)
+{
+ long i, olen;
+ for (i = 0; i < times; i++)
+ {
+ keccakF(S); /* Last squeeze did not do a ending squeeze */
+ olen = n;
+ while ((olen -= r) > 0)
+ keccakF(S);
+ }
+}
+
+
+/**
+ * Squeeze out another digest
+ *
+ * @return The hash sum
+ */
+byte* squeeze()
+{
+ long nn, ww, olen, i, j, ptr, ni;
+ byte* rc;
+
+ keccakF(S); /* Last squeeze did not do a ending squeeze */
+
+ ww = w >> 3;
+ rc = (byte*)malloc(nn = (n + 7) >> 3);
+ olen = n;
+ j = ptr = 0;
+ ni = (25 < r >> 3) ? 25 : (r >> 3);
+
while (olen > 0)
{
i = 0;
while ((i < ni) && (j < nn))
{
- llong v = S[(i % 5) * 5 + i / 5];
+ long _, v = S[(i % 5) * 5 + i / 5];
for (_ = 0; _ < ww; _++)
{
if (j < nn)
- rc[ptr++] = (byte)v;
+ *(rc + ptr++) = (byte)v;
v >>= 8;
j += 1;
}
@@ -693,8 +788,8 @@ byte* digest(byte* msg, jint msglen)
if (olen > 0)
keccakF(S);
}
- if ((n & 7))
- rc[n >> 3] &= (1 << (n & 7)) - 1;
+ if (n & 7)
+ rc[nn - 1] &= (1 << (n & 7)) - 1;
return rc;
}
@@ -713,23 +808,26 @@ JNIEXPORT void JNICALL Java_SHA3_initialise(JNIEnv* env, jclass class, jint bitr
JNIEXPORT void JNICALL Java_SHA3_update(JNIEnv* env, jclass class, jbyteArray msg, jint msglen)
{
(void) class;
- if ((msg != 0) && (msglen != 0))
+ if ((msg != null) && (msglen != 0))
update((byte*)((*env)->GetByteArrayElements(env, msg, 0)), msglen);
}
-JNIEXPORT jbyteArray JNICALL Java_SHA3_digest(JNIEnv* env, jclass class, jbyteArray msg, jint msglen)
+ JNIEXPORT jbyteArray JNICALL Java_SHA3_digest(JNIEnv* env, jclass class, jbyteArray msg, jint msglen, jboolean withReturn)
{
jbyte* rcn;
- jbyteArray rcj;
+ jbyteArray rcj = null;
(void) class;
- if ((msg != 0) && (msglen != 0))
- rcn = (jbyte*)digest((byte*)((*env)->GetByteArrayElements(env, msg, 0)), msglen);
+ if ((msg != null) && (msglen != 0))
+ rcn = (jbyte*)digest((byte*)((*env)->GetByteArrayElements(env, msg, 0)), msglen, withReturn);
else
- rcn = (jbyte*)digest(0, 0);
- rcj = (*env)->NewByteArray(env, (n + 7) >> 3);
- (*env)->SetByteArrayRegion(env, rcj, 0, (n + 7) >> 3, rcn);
+ rcn = (jbyte*)digest(null, 0, withReturn);
+ if (withReturn)
+ {
+ rcj = (*env)->NewByteArray(env, (n + 7) >> 3);
+ (*env)->SetByteArrayRegion(env, rcj, 0, (n + 7) >> 3, rcn);
+ }
return rcj;
}