28 		x[0]  += x[4];    x[12] = rol32(x[12] ^ x[0],  16);  in chacha20_block()
29 		x[1]  += x[5];    x[13] = rol32(x[13] ^ x[1],  16);  in chacha20_block()
30 		x[2]  += x[6];    x[14] = rol32(x[14] ^ x[2],  16);  in chacha20_block()
31 		x[3]  += x[7];    x[15] = rol32(x[15] ^ x[3],  16);  in chacha20_block()
33 		x[8]  += x[12];   x[4]  = rol32(x[4]  ^ x[8],  12);  in chacha20_block()
34 		x[9]  += x[13];   x[5]  = rol32(x[5]  ^ x[9],  12);  in chacha20_block()
35 		x[10] += x[14];   x[6]  = rol32(x[6]  ^ x[10], 12);  in chacha20_block()
36 		x[11] += x[15];   x[7]  = rol32(x[7]  ^ x[11], 12);  in chacha20_block()
38 		x[0]  += x[4];    x[12] = rol32(x[12] ^ x[0],   8);  in chacha20_block()
39 		x[1]  += x[5];    x[13] = rol32(x[13] ^ x[1],   8);  in chacha20_block()
40 		x[2]  += x[6];    x[14] = rol32(x[14] ^ x[2],   8);  in chacha20_block()
41 		x[3]  += x[7];    x[15] = rol32(x[15] ^ x[3],   8);  in chacha20_block()
43 		x[8]  += x[12];   x[4]  = rol32(x[4]  ^ x[8],   7);  in chacha20_block()
44 		x[9]  += x[13];   x[5]  = rol32(x[5]  ^ x[9],   7);  in chacha20_block()
45 		x[10] += x[14];   x[6]  = rol32(x[6]  ^ x[10],  7);  in chacha20_block()
46 		x[11] += x[15];   x[7]  = rol32(x[7]  ^ x[11],  7);  in chacha20_block()
48 		x[0]  += x[5];    x[15] = rol32(x[15] ^ x[0],  16);  in chacha20_block()
49 		x[1]  += x[6];    x[12] = rol32(x[12] ^ x[1],  16);  in chacha20_block()
50 		x[2]  += x[7];    x[13] = rol32(x[13] ^ x[2],  16);  in chacha20_block()
51 		x[3]  += x[4];    x[14] = rol32(x[14] ^ x[3],  16);  in chacha20_block()
53 		x[10] += x[15];   x[5]  = rol32(x[5]  ^ x[10], 12);  in chacha20_block()
54 		x[11] += x[12];   x[6]  = rol32(x[6]  ^ x[11], 12);  in chacha20_block()
55 		x[8]  += x[13];   x[7]  = rol32(x[7]  ^ x[8],  12);  in chacha20_block()
56 		x[9]  += x[14];   x[4]  = rol32(x[4]  ^ x[9],  12);  in chacha20_block()
58 		x[0]  += x[5];    x[15] = rol32(x[15] ^ x[0],   8);  in chacha20_block()
59 		x[1]  += x[6];    x[12] = rol32(x[12] ^ x[1],   8);  in chacha20_block()
60 		x[2]  += x[7];    x[13] = rol32(x[13] ^ x[2],   8);  in chacha20_block()
61 		x[3]  += x[4];    x[14] = rol32(x[14] ^ x[3],   8);  in chacha20_block()
63 		x[10] += x[15];   x[5]  = rol32(x[5]  ^ x[10],  7);  in chacha20_block()
64 		x[11] += x[12];   x[6]  = rol32(x[6]  ^ x[11],  7);  in chacha20_block()
65 		x[8]  += x[13];   x[7]  = rol32(x[7]  ^ x[8],   7);  in chacha20_block()
66 		x[9]  += x[14];   x[4]  = rol32(x[4]  ^ x[9],   7);  in chacha20_block()