They're all a number of fairly simple shift/arithmetic operations, two (untested) implemented below with hints for the rest;
1) bx←bx×32C (1 line)
# A left shift by 5 positions is a multiplication by 32
shl $5, %ebx
2) bx←bx×41 (5 lines, clobbering eax)
# Add ebx + 8*ebx + 32*ebx = 41*ebx
mov %eax, %ebx
shl $3, %ebx
add %eax, %ebx
shl $2, %ebx
add %ebx, %eax
3) bx←bx×63
# Calculate 64*ebx - ebx = 63*ebx
4) bx←bx/16
# A shift right by 4 is a division by 16
