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Optimize BlockCipher throughput #436

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Merged
kruton merged 1 commit into from
Dec 20, 2025
Merged

Optimize BlockCipher throughput #436

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9 changes: 9 additions & 0 deletions src/main/java/com/trilead/ssh2/crypto/cipher/AES.java
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,15 @@ public void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff) {
}
}

@Override
public void transformBlocks(byte[] src, int srcoff, byte[] dst, int dstoff, int numBlocks) {
try {
cipher.update(src, srcoff, numBlocks * AES_BLOCK_SIZE, dst, dstoff);
} catch (ShortBufferException e) {
throw new AssertionError(e);
}
}

/**
* AES in CBC (Cipher Block Chaining) mode for SSH.
*/
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7 changes: 7 additions & 0 deletions src/main/java/com/trilead/ssh2/crypto/cipher/BlockCipher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,11 @@ public interface BlockCipher
int getBlockSize();

void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff);

default void transformBlocks(byte[] src, int srcoff, byte[] dst, int dstoff, int numBlocks) {
int blockSize = getBlockSize();
for (int i = 0; i < numBlocks; i++) {
transformBlock(src, srcoff + i * blockSize, dst, dstoff + i * blockSize);
}
}
}
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