Simple comparison of SHA-256 performance reading random bytes from SSD (context: http://www.avpreserve.com/wp-content/uploads/2014/08/ChecksumComparisons.pdf)

sha256 performance log

time ./simple-sha256.pl 1GB 10GB
1GB	1872c9662b6cd15fbbb66be3a760d4bd02ab5077429db21103ac8f63538d8a5f
10GB	732377e7f4a2abdc13ddfa1eb4c9c497fd2a2b294674d056cf51581b47dd586d

real	1m31.644s
user	1m26.695s
sys	0m4.465s

SHA256(1GB)= 1872c9662b6cd15fbbb66be3a760d4bd02ab5077429db21103ac8f63538d8a5f
SHA256(10GB)= 732377e7f4a2abdc13ddfa1eb4c9c497fd2a2b294674d056cf51581b47dd586d

real	1m21.558s
user	1m16.691s
sys	0m4.407s

time /usr/local/Cellar/openssl/1.0.1h/bin/openssl sha256 1GB 10GB 
SHA256(1GB)= 1872c9662b6cd15fbbb66be3a760d4bd02ab5077429db21103ac8f63538d8a5f
SHA256(10GB)= 732377e7f4a2abdc13ddfa1eb4c9c497fd2a2b294674d056cf51581b47dd586d

real	1m5.670s
user	0m59.822s
sys	0m5.102s

time openssl md5 1GB 10GB
MD5(1GB)= fbdb5c269cfeec36232828435cd924a0
MD5(10GB)= 2dd26c4d4799ebd29fa31e48d49e8e53

real	0m37.603s
user	0m31.726s
sys	0m4.681s

MD5(1GB)= fbdb5c269cfeec36232828435cd924a0
MD5(10GB)= 2dd26c4d4799ebd29fa31e48d49e8e53

real	0m31.068s
user	0m23.406s
sys	0m5.101s

sha256.pl

#!/usr/bin/perl

use Digest::file qw(digest_file_hex);

foreach my $file (@ARGV) {
    print $file, "\t", digest_file_hex($file, 'SHA-256'), "\n";
}