diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java')
| -rw-r--r-- | bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java b/bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java index 924dff35..021b0f7d 100644 --- a/bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java +++ b/bcprov/src/main/java/org/bouncycastle/crypto/engines/AESEngine.java @@ -5,6 +5,7 @@ import org.bouncycastle.crypto.CipherParameters; import org.bouncycastle.crypto.DataLengthException; import org.bouncycastle.crypto.OutputLengthException; import org.bouncycastle.crypto.params.KeyParameter; +import org.bouncycastle.util.Arrays; import org.bouncycastle.util.Pack; /** @@ -415,6 +416,8 @@ private static final int[] Tinv0 = private int C0, C1, C2, C3; private boolean forEncryption; + private byte[] s; + private static final int BLOCK_SIZE = 16; /** @@ -440,6 +443,14 @@ private static final int[] Tinv0 = { WorkingKey = generateWorkingKey(((KeyParameter)params).getKey(), forEncryption); this.forEncryption = forEncryption; + if (forEncryption) + { + s = Arrays.clone(S); + } + else + { + s = Arrays.clone(Si); + } return; } @@ -578,10 +589,10 @@ private static final int[] Tinv0 = // the final round's table is a simple function of S so we don't use a whole other four tables for it - this.C0 = (S[r0&255]&255) ^ ((S[(r1>>8)&255]&255)<<8) ^ ((S[(r2>>16)&255]&255)<<16) ^ (S[(r3>>24)&255]<<24) ^ KW[r][0]; - this.C1 = (S[r1&255]&255) ^ ((S[(r2>>8)&255]&255)<<8) ^ ((S[(r3>>16)&255]&255)<<16) ^ (S[(r0>>24)&255]<<24) ^ KW[r][1]; - this.C2 = (S[r2&255]&255) ^ ((S[(r3>>8)&255]&255)<<8) ^ ((S[(r0>>16)&255]&255)<<16) ^ (S[(r1>>24)&255]<<24) ^ KW[r][2]; - this.C3 = (S[r3&255]&255) ^ ((S[(r0>>8)&255]&255)<<8) ^ ((S[(r1>>16)&255]&255)<<16) ^ (S[(r2>>24)&255]<<24) ^ KW[r][3]; + this.C0 = (S[r0&255]&255) ^ ((S[(r1>>8)&255]&255)<<8) ^ ((s[(r2>>16)&255]&255)<<16) ^ (s[(r3>>24)&255]<<24) ^ KW[r][0]; + this.C1 = (s[r1&255]&255) ^ ((S[(r2>>8)&255]&255)<<8) ^ ((S[(r3>>16)&255]&255)<<16) ^ (s[(r0>>24)&255]<<24) ^ KW[r][1]; + this.C2 = (s[r2&255]&255) ^ ((S[(r3>>8)&255]&255)<<8) ^ ((S[(r0>>16)&255]&255)<<16) ^ (S[(r1>>24)&255]<<24) ^ KW[r][2]; + this.C3 = (s[r3&255]&255) ^ ((s[(r0>>8)&255]&255)<<8) ^ ((s[(r1>>16)&255]&255)<<16) ^ (S[(r2>>24)&255]<<24) ^ KW[r][3]; } private void decryptBlock(int[][] KW) @@ -610,9 +621,9 @@ private static final int[] Tinv0 = // the final round's table is a simple function of Si so we don't use a whole other four tables for it - this.C0 = (Si[r0&255]&255) ^ ((Si[(r3>>8)&255]&255)<<8) ^ ((Si[(r2>>16)&255]&255)<<16) ^ (Si[(r1>>24)&255]<<24) ^ KW[0][0]; - this.C1 = (Si[r1&255]&255) ^ ((Si[(r0>>8)&255]&255)<<8) ^ ((Si[(r3>>16)&255]&255)<<16) ^ (Si[(r2>>24)&255]<<24) ^ KW[0][1]; - this.C2 = (Si[r2&255]&255) ^ ((Si[(r1>>8)&255]&255)<<8) ^ ((Si[(r0>>16)&255]&255)<<16) ^ (Si[(r3>>24)&255]<<24) ^ KW[0][2]; - this.C3 = (Si[r3&255]&255) ^ ((Si[(r2>>8)&255]&255)<<8) ^ ((Si[(r1>>16)&255]&255)<<16) ^ (Si[(r0>>24)&255]<<24) ^ KW[0][3]; + this.C0 = (Si[r0&255]&255) ^ ((s[(r3>>8)&255]&255)<<8) ^ ((s[(r2>>16)&255]&255)<<16) ^ (Si[(r1>>24)&255]<<24) ^ KW[0][0]; + this.C1 = (s[r1&255]&255) ^ ((s[(r0>>8)&255]&255)<<8) ^ ((Si[(r3>>16)&255]&255)<<16) ^ (s[(r2>>24)&255]<<24) ^ KW[0][1]; + this.C2 = (s[r2&255]&255) ^ ((Si[(r1>>8)&255]&255)<<8) ^ ((Si[(r0>>16)&255]&255)<<16) ^ (s[(r3>>24)&255]<<24) ^ KW[0][2]; + this.C3 = (Si[r3&255]&255) ^ ((s[(r2>>8)&255]&255)<<8) ^ ((s[(r1>>16)&255]&255)<<16) ^ (s[(r0>>24)&255]<<24) ^ KW[0][3]; } } |