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71 lines
1.3 KiB
Go
71 lines
1.3 KiB
Go
package checksum
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import (
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"fmt"
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"io"
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"strings"
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)
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// Check is a calculates and verifies a file checksum. This supports the sha1,
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// sha256 and sha512 values.
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func Check(in, checksum string) bool {
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hash, size, _ := split(checksum)
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// if a byte size is provided for the
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// Yaml file it must match.
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if size > 0 && int64(len(in)) != size {
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return false
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}
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switch len(hash) {
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case 64:
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return sha256sum(in) == hash
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case 128:
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return sha512sum(in) == hash
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case 40:
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return sha1sum(in) == hash
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}
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return false
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}
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func sha1sum(in string) string {
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h := sha1.New()
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io.WriteString(h, in)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func sha256sum(in string) string {
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h := sha256.New()
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io.WriteString(h, in)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func sha512sum(in string) string {
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h := sha512.New()
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io.WriteString(h, in)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func split(in string) (string, int64, string) {
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var hash string
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var name string
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var size int64
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// the checksum might be split into multiple
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// sections including the file size and name.
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switch strings.Count(in, " ") {
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case 1:
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fmt.Sscanf(in, "%s %s", &hash, &name)
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case 2:
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fmt.Sscanf(in, "%s %d %s", &hash, &size, &name)
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default:
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hash = in
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}
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return hash, size, name
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}
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