Produce 2 files that have the same SHA-1 hash value. (based on shattered.io)

a.rb

# based on shattered.io
open("1.dat", "w") do |f|
  f.print "\x25\x50\x44\x46\x2d\x31\x2e\x33\x0a\x25\xe2\xe3\xcf\xd3\x0a\x0a\x0a\x31\x20\x30\x20\x6f\x62\x6a\x0a\x3c\x3c\x2f\x57\x69\x64\x74\x68\x20\x32\x20\x30\x20\x52\x2f\x48\x65\x69\x67\x68\x74\x20\x33\x20\x30\x20\x52\x2f\x54\x79\x70\x65\x20\x34\x20\x30\x20\x52\x2f\x53\x75\x62\x74\x79\x70\x65\x20\x35\x20\x30\x20\x52\x2f\x46\x69\x6c\x74\x65\x72\x20\x36\x20\x30\x20\x52\x2f\x43\x6f\x6c\x6f\x72\x53\x70\x61\x63\x65\x20\x37\x20\x30\x20\x52\x2f\x4c\x65\x6e\x67\x74\x68\x20\x38\x20\x30\x20\x52\x2f\x42\x69\x74\x73\x50\x65\x72\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x20\x38\x3e\x3e\x0a\x73\x74\x72\x65\x61\x6d\x0a\xff\xd8\xff\xfe\x00\x24\x53\x48\x41\x2d\x31\x20\x69\x73\x20\x64\x65\x61\x64\x21\x21\x21\x21\x21\x85\x2f\xec\x09\x23\x39\x75\x9c\x39\xb1\xa1\xc6\x3c\x4c\x97\xe1\xff\xfe\x01\x73\x46\xdc\x91\x66\xb6\x7e\x11\x8f\x02\x9a\xb6\x21\xb2\x56\x0f\xf9\xca\x67\xcc\xa8\xc7\xf8\x5b\xa8\x4c\x79\x03\x0c\x2b\x3d\xe2\x18\xf8\x6d\xb3\xa9\x09\x01\xd5\xdf\x45\xc1\x4f\x26\xfe\xdf\xb3\xdc\x38\xe9\x6a\xc2\x2f\xe7\xbd\x72\x8f\x0e\x45\xbc\xe0\x46\xd2\x3c\x57\x0f\xeb\x14\x13\x98\xbb\x55\x2e\xf5\xa0\xa8\x2b\xe3\x31\xfe\xa4\x80\x37\xb8\xb5\xd7\x1f\x0e\x33\x2e\xdf\x93\xac\x35\x00\xeb\x4d\xdc\x0d\xec\xc1\xa8\x64\x79\x0c\x78\x2c\x76\x21\x56\x60\xdd\x30\x97\x91\xd0\x6b\xd0\xaf\x3f\x98\xcd\xa4\xbc\x46\x29\xb1"
end

open("2.dat", "w") do |f|
  f.print "\x25\x50\x44\x46\x2d\x31\x2e\x33\x0a\x25\xe2\xe3\xcf\xd3\x0a\x0a\x0a\x31\x20\x30\x20\x6f\x62\x6a\x0a\x3c\x3c\x2f\x57\x69\x64\x74\x68\x20\x32\x20\x30\x20\x52\x2f\x48\x65\x69\x67\x68\x74\x20\x33\x20\x30\x20\x52\x2f\x54\x79\x70\x65\x20\x34\x20\x30\x20\x52\x2f\x53\x75\x62\x74\x79\x70\x65\x20\x35\x20\x30\x20\x52\x2f\x46\x69\x6c\x74\x65\x72\x20\x36\x20\x30\x20\x52\x2f\x43\x6f\x6c\x6f\x72\x53\x70\x61\x63\x65\x20\x37\x20\x30\x20\x52\x2f\x4c\x65\x6e\x67\x74\x68\x20\x38\x20\x30\x20\x52\x2f\x42\x69\x74\x73\x50\x65\x72\x43\x6f\x6d\x70\x6f\x6e\x65\x6e\x74\x20\x38\x3e\x3e\x0a\x73\x74\x72\x65\x61\x6d\x0a\xff\xd8\xff\xfe\x00\x24\x53\x48\x41\x2d\x31\x20\x69\x73\x20\x64\x65\x61\x64\x21\x21\x21\x21\x21\x85\x2f\xec\x09\x23\x39\x75\x9c\x39\xb1\xa1\xc6\x3c\x4c\x97\xe1\xff\xfe\x01\x7f\x46\xdc\x93\xa6\xb6\x7e\x01\x3b\x02\x9a\xaa\x1d\xb2\x56\x0b\x45\xca\x67\xd6\x88\xc7\xf8\x4b\x8c\x4c\x79\x1f\xe0\x2b\x3d\xf6\x14\xf8\x6d\xb1\x69\x09\x01\xc5\x6b\x45\xc1\x53\x0a\xfe\xdf\xb7\x60\x38\xe9\x72\x72\x2f\xe7\xad\x72\x8f\x0e\x49\x04\xe0\x46\xc2\x30\x57\x0f\xe9\xd4\x13\x98\xab\xe1\x2e\xf5\xbc\x94\x2b\xe3\x35\x42\xa4\x80\x2d\x98\xb5\xd7\x0f\x2a\x33\x2e\xc3\x7f\xac\x35\x14\xe7\x4d\xdc\x0f\x2c\xc1\xa8\x74\xcd\x0c\x78\x30\x5a\x21\x56\x64\x61\x30\x97\x89\x60\x6b\xd0\xbf\x3f\x98\xcd\xa8\x04\x46\x29\xa1"
end

$ ruby a.rb
$ shasum -a 1 1.dat 2.dat
f92d74e3874587aaf443d1db961d4e26dde13e9c  1.dat
f92d74e3874587aaf443d1db961d4e26dde13e9c  2.dat