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Invert (1-y) just before the multiplication by (1+y) for readability
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@ -61,9 +61,9 @@ crypto_sign_ed25519_pk_to_curve25519(unsigned char *curve25519_pk,
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}
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}
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fe25519_1(one_minus_y);
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fe25519_1(one_minus_y);
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fe25519_sub(one_minus_y, one_minus_y, A.Y);
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fe25519_sub(one_minus_y, one_minus_y, A.Y);
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fe25519_invert(one_minus_y, one_minus_y);
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fe25519_1(x);
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fe25519_1(x);
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fe25519_add(x, x, A.Y);
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fe25519_add(x, x, A.Y);
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fe25519_invert(one_minus_y, one_minus_y);
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fe25519_mul(x, x, one_minus_y);
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fe25519_mul(x, x, one_minus_y);
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fe25519_tobytes(curve25519_pk, x);
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fe25519_tobytes(curve25519_pk, x);
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