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Validate digest length on parsing

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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2015-12-02 15:57:47 -08:00
parent 329c353411
commit f015982f0f
9 changed files with 95 additions and 65 deletions
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8
digest/digest.go
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@ -58,6 +58,9 @@ var (
// ErrDigestInvalidFormat returned when digest format invalid.
ErrDigestInvalidFormat = fmt.Errorf("invalid checksum digest format")
// ErrDigestInvalidLength returned when digest has invalid length.
ErrDigestInvalidLength = fmt.Errorf("invalid checksum digest length")
// ErrDigestUnsupported returned when the digest algorithm is unsupported.
ErrDigestUnsupported = fmt.Errorf("unsupported digest algorithm")
)
@ -126,8 +129,11 @@ func (d Digest) Validate() error {
return ErrDigestInvalidFormat
}
switch Algorithm(s[:i]) {
switch algorithm := Algorithm(s[:i]); algorithm {
case SHA256, SHA384, SHA512:
if algorithm.Size()*2 != len(s[i+1:]) {
return ErrDigestInvalidLength
}
break
default:
return ErrDigestUnsupported