secp256k1_fe_sqrt: Verify that the arguments don't alias.
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@ -48,6 +48,8 @@ static int secp256k1_fe_sqrt(secp256k1_fe *r, const secp256k1_fe *a) {
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secp256k1_fe x2, x3, x6, x9, x11, x22, x44, x88, x176, x220, x223, t1;
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int j;
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VERIFY_CHECK(r != a);
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/** The binary representation of (p + 1)/4 has 3 blocks of 1s, with lengths in
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* { 2, 22, 223 }. Use an addition chain to calculate 2^n - 1 for each block:
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* 1, [2], 3, 6, 9, 11, [22], 44, 88, 176, 220, [223]
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