435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
127 lines
2.7 KiB
Go
127 lines
2.7 KiB
Go
// +build go1.4
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package jwt
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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)
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// Implements the RSAPSS family of signing methods signing methods
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type SigningMethodRSAPSS struct {
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*SigningMethodRSA
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Options *rsa.PSSOptions
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}
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// Specific instances for RS/PS and company
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var (
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SigningMethodPS256 *SigningMethodRSAPSS
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SigningMethodPS384 *SigningMethodRSAPSS
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SigningMethodPS512 *SigningMethodRSAPSS
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)
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func init() {
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// PS256
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SigningMethodPS256 = &SigningMethodRSAPSS{
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&SigningMethodRSA{
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Name: "PS256",
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Hash: crypto.SHA256,
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},
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&rsa.PSSOptions{
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SaltLength: rsa.PSSSaltLengthAuto,
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Hash: crypto.SHA256,
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},
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}
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RegisterSigningMethod(SigningMethodPS256.Alg(), func() SigningMethod {
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return SigningMethodPS256
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})
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// PS384
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SigningMethodPS384 = &SigningMethodRSAPSS{
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&SigningMethodRSA{
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Name: "PS384",
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Hash: crypto.SHA384,
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},
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&rsa.PSSOptions{
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SaltLength: rsa.PSSSaltLengthAuto,
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Hash: crypto.SHA384,
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},
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}
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RegisterSigningMethod(SigningMethodPS384.Alg(), func() SigningMethod {
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return SigningMethodPS384
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})
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// PS512
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SigningMethodPS512 = &SigningMethodRSAPSS{
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&SigningMethodRSA{
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Name: "PS512",
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Hash: crypto.SHA512,
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},
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&rsa.PSSOptions{
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SaltLength: rsa.PSSSaltLengthAuto,
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Hash: crypto.SHA512,
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},
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}
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RegisterSigningMethod(SigningMethodPS512.Alg(), func() SigningMethod {
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return SigningMethodPS512
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})
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}
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// Implements the Verify method from SigningMethod
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// For this verify method, key must be an rsa.PublicKey struct
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func (m *SigningMethodRSAPSS) Verify(signingString, signature string, key interface{}) error {
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var err error
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// Decode the signature
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var sig []byte
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if sig, err = DecodeSegment(signature); err != nil {
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return err
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}
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var rsaKey *rsa.PublicKey
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switch k := key.(type) {
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case *rsa.PublicKey:
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rsaKey = k
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default:
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return ErrInvalidKey
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}
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// Create hasher
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if !m.Hash.Available() {
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return ErrHashUnavailable
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}
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hasher := m.Hash.New()
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hasher.Write([]byte(signingString))
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return rsa.VerifyPSS(rsaKey, m.Hash, hasher.Sum(nil), sig, m.Options)
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}
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// Implements the Sign method from SigningMethod
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// For this signing method, key must be an rsa.PrivateKey struct
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func (m *SigningMethodRSAPSS) Sign(signingString string, key interface{}) (string, error) {
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var rsaKey *rsa.PrivateKey
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switch k := key.(type) {
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case *rsa.PrivateKey:
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rsaKey = k
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default:
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return "", ErrInvalidKeyType
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}
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// Create the hasher
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if !m.Hash.Available() {
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return "", ErrHashUnavailable
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}
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hasher := m.Hash.New()
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hasher.Write([]byte(signingString))
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// Sign the string and return the encoded bytes
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if sigBytes, err := rsa.SignPSS(rand.Reader, rsaKey, m.Hash, hasher.Sum(nil), m.Options); err == nil {
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return EncodeSegment(sigBytes), nil
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} else {
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return "", err
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}
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}
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