ROR puzzle

ror_puzzle.c

uint32_t ror(const uint32_t w, const unsigned rot) { // ROtate Right (bits move `rot` places right w/ wraparound)
    return (w >> rot) | (w << (32 - rot));
}

uint32_t a; // = ?
uint32_t rotation = 13;
uint32_t b = 0x29d34b82;

// b == a ^ ror(a, rotation)

// What is `a` when `b` was formed by `a ^ ror(a, rotation)`? There is more than one correct answer.

^ is the bitwise XOR operator, the function ror rotates bits to the right.