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Generate checksums in Go. Keep it simple, keep it safe.
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| package main | |
| import ( | |
| "crypto/md5" | |
| "crypto/sha1" | |
| "crypto/sha256" | |
| "crypto/sha512" | |
| "fmt" | |
| "hash/adler32" | |
| "hash/crc32" | |
| "io" | |
| "io/ioutil" | |
| "strconv" | |
| ) | |
| func checksum(r io.Reader, method string) (string, error) { | |
| b, err := ioutil.ReadAll(r) | |
| if err != nil { | |
| return "", err | |
| } | |
| switch method { | |
| case "md5": | |
| return fmt.Sprintf("%x", md5.Sum(b)), nil | |
| case "sha1": | |
| return fmt.Sprintf("%x", sha1.Sum(b)), nil | |
| case "sha256": | |
| return fmt.Sprintf("%x", sha256.Sum256(b)), nil | |
| case "sha512": | |
| return fmt.Sprintf("%x", sha512.Sum512(b)), nil | |
| case "adler32": | |
| return strconv.FormatUint(uint64(adler32.Checksum(b)), 10), nil | |
| case "crc32": | |
| return strconv.FormatUint(uint64(crc32.ChecksumIEEE(b)), 10), nil | |
| default: | |
| return "", fmt.Errorf("hashing method %s is not supported", method) | |
| } | |
| } |
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