Can an MD5-hash begin with a zero?

Question

Can an MD5-hash begin with a zero? What about SHA-1?

Answer 1

MD5 hash of "a" = 0cc175b9c0f1b6a831c399e269772661

SHA1 hash of "9" = 0ade7c2cf97f75d009975f4d720d1fa6c19f4897

Answer 2

Yes:

$ echo -n "363" | md5sum
00411460f7c92d2124a67ea0f4cb5f85  -
$ echo -n "351" | sha1sum
0026476a20bfbd08714155bb66f0b4feb2d25c1c

Found by running the following in bash:

for i in  {1..1000} ; do echo $(echo -n $i | md5sum) $i ; done | sort | head