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@@ -15,14 +15,22 @@ static const struct PRGkey {
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// the left child, 1 for the right child
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static inline void prg(__m128i &out, __m128i seed, bool whichchild)
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{
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- AES_ECB_encrypt(out, set_lsb(seed, whichchild), prgkey.k);
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+ __m128i in = set_lsb(seed, whichchild);
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+ __m128i mid;
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+ AES_ECB_encrypt(mid, set_lsb(seed, whichchild), prgkey.k);
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+ out = _mm_xor_si128(mid, in);
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}
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// Compute both children of node seed
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static inline void prgboth(__m128i &left, __m128i &right, __m128i seed)
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{
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- AES_ECB_encrypt(left, set_lsb(seed, 0), prgkey.k);
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- AES_ECB_encrypt(right, set_lsb(seed, 1), prgkey.k);
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+ __m128i in0 = set_lsb(seed, 0);
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+ __m128i in1 = set_lsb(seed, 1);
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+ __m128i mid0, mid1;
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+ AES_ECB_encrypt(mid0, set_lsb(seed, 0), prgkey.k);
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+ AES_ECB_encrypt(mid1, set_lsb(seed, 1), prgkey.k);
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+ left = _mm_xor_si128(mid0, in0);
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+ right = _mm_xor_si128(mid1, in1);
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}
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#endif
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