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author | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-15 01:38:01 +0400 |
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committer | Roberto Tyley <roberto.tyley@gmail.com> | 2014-07-26 11:23:17 +0400 |
commit | 7cb752aaf746dc0b473afeb9e892b7fbc12666c5 (patch) | |
tree | cc4f91ddc18332b5adbe82e3fcb040d976c90105 /core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java | |
parent | 551830f8ea5177042af2c7dd1fc90888bc67387d (diff) |
Execute become-spongy.sh
https://github.com/rtyley/spongycastle/blob/3040af/become-spongy.sh
Diffstat (limited to 'core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java')
-rw-r--r-- | core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java b/core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java new file mode 100644 index 00000000..b84fe6f0 --- /dev/null +++ b/core/src/main/java/org/spongycastle/crypto/modes/gcm/BasicGCMExponentiator.java @@ -0,0 +1,36 @@ +package org.spongycastle.crypto.modes.gcm; + +import org.spongycastle.util.Arrays; + +public class BasicGCMExponentiator implements GCMExponentiator +{ + private int[] x; + + public void init(byte[] x) + { + this.x = GCMUtil.asInts(x); + } + + public void exponentiateX(long pow, byte[] output) + { + // Initial value is little-endian 1 + int[] y = GCMUtil.oneAsInts(); + + if (pow > 0) + { + int[] powX = Arrays.clone(x); + do + { + if ((pow & 1L) != 0) + { + GCMUtil.multiply(y, powX); + } + GCMUtil.multiply(powX, powX); + pow >>>= 1; + } + while (pow > 0); + } + + GCMUtil.asBytes(y, output); + } +} |