Hash checksums: MD5, SHA-1, SHA-256

yourbasic.org/golang

String checksum

To compute the hash value of a string or byte slice, use the Sum function from a crypto package such as crypto/md5, crypto/sha1, or crypto/sha256.

s := "Foo" md5 := md5.Sum([]byte(s)) sha1 := sha1.Sum([]byte(s)) sha256 := sha256.Sum256([]byte(s)) fmt.Printf("%x\n", md5) fmt.Printf("%x\n", sha1) fmt.Printf("%x\n", sha256)

1356c67d7ad1638d816bfb822dd2c25d 201a6b3053cc1422d2c3670b62616221d2290929 1cbec737f863e4922cee63cc2ebbfaafcd1cff8b790d8cfd2e6a5d550b648afa

File checksum

To compute the hash value of a file or other input stream:

create a new hash.Hash from a crypto package such as crypto/md5, crypto/sha1, or crypto/sha256,
add data by writing to its io.Writer function,
extract the checksum by calling its Sum function.

input := strings.NewReader("Foo") hash := sha256.New() if _, err := io.Copy(hash, input); err != nil {	log.Fatal(err) } sum := hash.Sum(nil) fmt.Printf("%x\n", sum)

1cbec737f863e4922cee63cc2ebbfaafcd1cff8b790d8cfd2e6a5d550b648afa

More code examples

Go blueprints: code for common tasks is a collection of handy code examples.