81 lines
2 KiB
Go
81 lines
2 KiB
Go
package crypto
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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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"encoding/json"
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)
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// SigningMethodRSA implements the RSA family of SigningMethods.
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type SigningMethodRSA struct {
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Name string
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Hash crypto.Hash
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_ struct{}
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}
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// Specific instances of RSA SigningMethods.
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var (
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// SigningMethodRS256 implements RS256.
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SigningMethodRS256 = &SigningMethodRSA{
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Name: "RS256",
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Hash: crypto.SHA256,
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}
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// SigningMethodRS384 implements RS384.
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SigningMethodRS384 = &SigningMethodRSA{
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Name: "RS384",
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Hash: crypto.SHA384,
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}
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// SigningMethodRS512 implements RS512.
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SigningMethodRS512 = &SigningMethodRSA{
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Name: "RS512",
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Hash: crypto.SHA512,
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}
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)
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// Alg implements the SigningMethod interface.
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func (m *SigningMethodRSA) Alg() string { return m.Name }
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// Verify implements the Verify method from SigningMethod.
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// For this signing method, must be an *rsa.PublicKey.
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func (m *SigningMethodRSA) Verify(raw []byte, sig Signature, key interface{}) error {
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rsaKey, ok := key.(*rsa.PublicKey)
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if !ok {
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return ErrInvalidKey
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}
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return rsa.VerifyPKCS1v15(rsaKey, m.Hash, m.sum(raw), sig)
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}
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// Sign implements the Sign method from SigningMethod.
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// For this signing method, must be an *rsa.PrivateKey structure.
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func (m *SigningMethodRSA) Sign(data []byte, key interface{}) (Signature, error) {
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rsaKey, ok := key.(*rsa.PrivateKey)
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if !ok {
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return nil, ErrInvalidKey
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}
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sigBytes, err := rsa.SignPKCS1v15(rand.Reader, rsaKey, m.Hash, m.sum(data))
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if err != nil {
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return nil, err
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}
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return Signature(sigBytes), nil
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}
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func (m *SigningMethodRSA) sum(b []byte) []byte {
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h := m.Hash.New()
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h.Write(b)
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return h.Sum(nil)
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}
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// Hasher implements the SigningMethod interface.
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func (m *SigningMethodRSA) Hasher() crypto.Hash { return m.Hash }
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// MarshalJSON implements json.Marshaler.
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// See SigningMethodECDSA.MarshalJSON() for information.
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func (m *SigningMethodRSA) MarshalJSON() ([]byte, error) {
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return []byte(`"` + m.Alg() + `"`), nil
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}
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var _ json.Marshaler = (*SigningMethodRSA)(nil)
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