Hi guys,
I am designing an Android application for a school project which
requires me to do chain hashing and i have realised that the SHA256
hashing method works really slow on my Android devices compared to an
old PC. I tried it on Nexus one using ice cream sandwhich, Nexus S and
HTC Incredible S using gingerbread.
Below is my implementation of the hash. Had tried with MD5 and SHA1
too and the speed is still slow.
Is there something wrong with my implementation, is there anyway to
speed up the hashing?
public static String SHA256(String toHash) {
try {
md = MessageDigest.getInstance("SHA-256");
} catch (NoSuchAlgorithmException ex) {
}
md.update(toHash.getBytes());
byte byteData[] = md.digest();
sb = new StringBuilder(byteData.length * 2);
for (byte b : byteData) {
sb.append(HEX_CHARS[(b & 0xF0) >> 4]);
sb.append(HEX_CHARS[b & 0x0F]);
}
return sb.toString();
}
Thank in advance!
Here are some timings which i had collected from my Nexus One:
Hash Based SHA256 SHA1 MD5 SHA512
No. of hashes Maximum Time taken (ms)
10 1,024 250 229 213 283
11 2,048 506 465 443 597
12 4,096 998 925 869 1142
13 8,192 1993 1839 1801 2254
14 16,384 3977 3703 3658 4528
15 32,768 7933 7281 7234 8990
16 65,536 15934 14846 14723 18216
17 131,072 32105 29696 29325 36466
18 262,144 64314 59278 58279 73158
19 524,288 128484 119484 116894 146227
20 1,048,576 254778 237204 233112 294316
21 2,097,152 524359 473092 466695 582703
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