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md5_checksum.go (615B)

      1 package http
      2 
      3 import (
      4 	"crypto/md5"
      5 	"encoding/base64"
      6 	"fmt"
      7 	"io"
      8 )
      9 
     10 // computeMD5Checksum computes base64 md5 checksum of an io.Reader's contents.
     11 // Returns the byte slice of md5 checksum and an error.
     12 func computeMD5Checksum(r io.Reader) ([]byte, error) {
     13 	h := md5.New()
     14 	// copy errors may be assumed to be from the body.
     15 	_, err := io.Copy(h, r)
     16 	if err != nil {
     17 		return nil, fmt.Errorf("failed to read body: %w", err)
     18 	}
     19 
     20 	// encode the md5 checksum in base64.
     21 	sum := h.Sum(nil)
     22 	sum64 := make([]byte, base64.StdEncoding.EncodedLen(len(sum)))
     23 	base64.StdEncoding.Encode(sum64, sum)
     24 	return sum64, nil
     25 }