Mac OS X / iOS UInt32 randomness

randomness.sh

#!/bin/bash
# Just:
# curl -kOs https://raw.github.com/gist/1536232/randomness.sh; chmod +x randomness.sh; ./randomness.sh

# I know, it seems pointless but it's just a simple example of how to:
# 1. Compile against a Framework on Mac OS.
# 2. Mix sources.
# 3. Determine if a script is sourced or executed directly.
sourced() { [ 'bash' == $0 ] || [ ${BASH_SOURCE[0]} != $0 ]; }
(
  u="$(date -u +%Y%m%dt%H%M%S).$$.${RANDOM}" n="/tmp/${u}" c="${n}.c"
  trap "rm -f '${n}' '${c}'" 0
  l=$(grep -n '[#]import' ${BASH_SOURCE[0]} | head -1 | awk 'BEGIN{FS=":"} {print $1}')
  sed -n ${l}',$p' ${BASH_SOURCE[0]} >${c}
  cc -F/System/Library/Frameworks/Security.framework -framework Security -o "${n}" "${c}" || exit $?
  [ -x "${n}" ] && "${n}" || exit $?
  exit 0
); r=$? sourced && return ${r} || exit ${r}

#import <Security/SecRandom.h>
#import <stdio.h>
int main() {
  UInt32 randomResult = 0;
  int result = SecRandomCopyBytes(kSecRandomDefault, sizeof(int), (uint8_t*)&randomResult);
  if (result != 0) randomResult = arc4random();
  printf("%u\n",randomResult);
  return randomResult;
}