Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Fail-safe check on RSA #72

Merged
merged 3 commits into from
Jun 21, 2022
Merged

Fail-safe check on RSA #72

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
2b2823f
check hash func
shizhMSFT May 30, 2022
c1cbfcc
clearer doc
shizhMSFT May 30, 2022
d2a091d
specify detailed error on programming errors
shizhMSFT Jun 21, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
12 changes: 9 additions & 3 deletions rsa.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,15 @@ func (rs *rsaSigner) Algorithm() Algorithm {
return rs.alg
}

// Sign signs digest with the private key, possibly using entropy from rand.
// Sign signs digest with the private key, using entropy from rand.
// The resulting signature should follow RFC 8152 section 8.
//
// Reference: https://datatracker.ietf.org/doc/html/rfc8152#section-8
func (rs *rsaSigner) Sign(rand io.Reader, digest []byte) ([]byte, error) {
hash, _ := rs.alg.hashFunc()
hash, ok := rs.alg.hashFunc()
if !ok {
return nil, ErrInvalidAlgorithm
}
return rs.key.Sign(rand, digest, &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthEqualsHash, // defined in RFC 8230 sec 2
Hash: hash,
Expand All @@ -49,7 +52,10 @@ func (rv *rsaVerifier) Algorithm() Algorithm {
//
// Reference: https://datatracker.ietf.org/doc/html/rfc8152#section-8
func (rv *rsaVerifier) Verify(digest []byte, signature []byte) error {
hash, _ := rv.alg.hashFunc()
hash, ok := rv.alg.hashFunc()
if !ok {
return ErrInvalidAlgorithm
}
if err := rsa.VerifyPSS(rv.key, hash, digest, signature, &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthEqualsHash, // defined in RFC 8230 sec 2
}); err != nil {
Expand Down