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residue = len % CTS_BLOCK_SIZE;

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if (!ctx->hw->cipher(ctx, out - CTS_BLOCK_SIZE + residue, tmp_in.c,

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CTS_BLOCK_SIZE))

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residue = len % CTS_BLOCK_SIZE;

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len -= CTS_BLOCK_SIZE + residue;

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memcpy(mid_iv.c, ctx->iv, CTS_BLOCK_SIZE);

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memcpy(cn.c, in + residue, CTS_BLOCK_SIZE);

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memset(ctx->iv, 0, CTS_BLOCK_SIZE);

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if (!ctx->hw->cipher(ctx, pt_last.c, in + residue, CTS_BLOCK_SIZE))

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memcpy(ct_mid.c + residue, pt_last.c + residue, CTS_BLOCK_SIZE - residue);

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do_xor(ct_mid.c, pt_last.c, residue, out + CTS_BLOCK_SIZE);

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memcpy(ctx->iv, mid_iv.c, CTS_BLOCK_SIZE);

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if (!ctx->hw->cipher(ctx, out, ct_mid.c, CTS_BLOCK_SIZE))

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memcpy(ctx->iv, cn.c, CTS_BLOCK_SIZE);

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return len + CTS_BLOCK_SIZE + residue;

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if (len < CTS_BLOCK_SIZE) /* CS3 requires at least one block */

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if (len == CTS_BLOCK_SIZE)

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residue = len % CTS_BLOCK_SIZE;

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residue = CTS_BLOCK_SIZE;

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memcpy(out, out - CTS_BLOCK_SIZE, residue);

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if (!ctx->hw->cipher(ctx, out - CTS_BLOCK_SIZE, tmp_in.c, CTS_BLOCK_SIZE))

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if (len < CTS_BLOCK_SIZE) /* CS3 requires at least one block */

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if (len == CTS_BLOCK_SIZE)

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residue = len % CTS_BLOCK_SIZE;

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residue = CTS_BLOCK_SIZE;

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len -= CTS_BLOCK_SIZE + residue;

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memcpy(mid_iv.c, ctx->iv, CTS_BLOCK_SIZE);

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memcpy(cn.c, in, CTS_BLOCK_SIZE);

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memset(ctx->iv, 0, CTS_BLOCK_SIZE);

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if (!ctx->hw->cipher(ctx, pt_last.c, in, CTS_BLOCK_SIZE))

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memcpy(ct_mid.c, in + CTS_BLOCK_SIZE, residue);

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if (residue != CTS_BLOCK_SIZE)

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memcpy(ct_mid.c + residue, pt_last.c + residue, CTS_BLOCK_SIZE - residue);

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do_xor(ct_mid.c, pt_last.c, residue, out + CTS_BLOCK_SIZE);

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memcpy(ctx->iv, mid_iv.c, CTS_BLOCK_SIZE);

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if (!ctx->hw->cipher(ctx, out, ct_mid.c, CTS_BLOCK_SIZE))

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memcpy(ctx->iv, cn.c, CTS_BLOCK_SIZE);

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return len + CTS_BLOCK_SIZE + residue;

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if (len % CTS_BLOCK_SIZE == 0) {

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if (len % CTS_BLOCK_SIZE == 0) {

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if (inl < CTS_BLOCK_SIZE) /* There must be at least one block for CTS mode */

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63

unsigned char c[CTS_BLOCK_SIZE];