Previously I talked about files, encoding in golang. In this LTD (learn to do) I will talk about hash package in general.
https://blog.samarthya.me/wps/2021/01/30/golang-encoding/
Help#
- https://golang.org/pkg/hash/#Hash
- https://golang.org/pkg/crypto/#Hash.New
- https://golang.org/src/crypto/crypto.go?s=364:378#L6
- https://golang.org/pkg/crypto/#pkg-subdirectories
Package crypto collects common cryptographic constants.
— Official golang documentation
const (
MD4 Hash = 1 + iota // import golang.org/x/crypto/md4
MD5 // import crypto/md5
SHA1 // import crypto/sha1
SHA224 // import crypto/sha256
SHA256 // import crypto/sha256
SHA384 // import crypto/sha512
SHA512 // import crypto/sha512
MD5SHA1 // no implementation; MD5+SHA1 used for TLS RSA
RIPEMD160 // import golang.org/x/crypto/ripemd160
SHA3_224 // import golang.org/x/crypto/sha3
SHA3_256 // import golang.org/x/crypto/sha3
SHA3_384 // import golang.org/x/crypto/sha3
SHA3_512 // import golang.org/x/crypto/sha3
SHA512_224 // import crypto/sha512
SHA512_256 // import crypto/sha512
BLAKE2s_256 // import golang.org/x/crypto/blake2s
BLAKE2b_256 // import golang.org/x/crypto/blake2b
BLAKE2b_384 // import golang.org/x/crypto/blake2b
BLAKE2b_512 // import golang.org/x/crypto/blake2b
)Let’s try out a simple MD5 hasher.
Package md5 implements the MD5 hash algorithm as defined in RFC 1321
— packagemd5
fmt.Printf(" Is BLAKE2b_256 available: %t\n", crypto.BLAKE2b_256.Available())
fmt.Printf(" Is MD5 available: %t\n", crypto.MD5.Available())
var hasher hash.Hash
// Creates a new MD5 hasher
hasher = md5.New()
io.WriteString(hasher, "And Leon's getting laaarger!")
fmt.Printf("%x\n", hasher.Sum(nil))New()#
New returns a new hash.Hash computing the MD5 checksum.
Sum()#
Sum returns the MD5 checksum of the data.
fmt.Printf(" Is MD5 available: %t\n", crypto.MD5.Available())
fmt.Printf(" Is SHA1 available: %t\n", crypto.SHA1.Available())
fmt.Printf(" Is SHA256 available: %t\n", crypto.SHA256.Available())
var hasher hash.Hash
// Creates a new MD5 hasher
hasher = md5.New()
// Version 1
io.WriteString(hasher, "And Leon's getting laaarger!")
fmt.Printf("%x\n", hasher.Sum(nil))
fmt.Printf("Size: %d\n", hasher.Size())
// Version 2
var data = []byte("Data for which the md5 hash will be computed")
fmt.Printf("%x\n", hasher.Sum(data))
fmt.Printf("Size: %d\n", hasher.Size())
sha1 := sha1.New()
fmt.Printf("%x\n", sha1.Sum(nil))
fmt.Printf("Size: %d\n", sha1.Size())
sha256 := sha256.New()
fmt.Printf("%x\n", sha256.Sum(nil))
fmt.Printf("Size: %d\n", sha256.Size())