forked from toolshed/abra
57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package libtrust
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import (
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"crypto"
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_ "crypto/sha256" // Registrer SHA224 and SHA256
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_ "crypto/sha512" // Registrer SHA384 and SHA512
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"fmt"
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)
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type signatureAlgorithm struct {
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algHeaderParam string
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hashID crypto.Hash
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}
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func (h *signatureAlgorithm) HeaderParam() string {
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return h.algHeaderParam
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}
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func (h *signatureAlgorithm) HashID() crypto.Hash {
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return h.hashID
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}
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var (
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rs256 = &signatureAlgorithm{"RS256", crypto.SHA256}
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rs384 = &signatureAlgorithm{"RS384", crypto.SHA384}
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rs512 = &signatureAlgorithm{"RS512", crypto.SHA512}
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es256 = &signatureAlgorithm{"ES256", crypto.SHA256}
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es384 = &signatureAlgorithm{"ES384", crypto.SHA384}
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es512 = &signatureAlgorithm{"ES512", crypto.SHA512}
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)
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func rsaSignatureAlgorithmByName(alg string) (*signatureAlgorithm, error) {
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switch {
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case alg == "RS256":
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return rs256, nil
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case alg == "RS384":
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return rs384, nil
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case alg == "RS512":
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return rs512, nil
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default:
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return nil, fmt.Errorf("RSA Digital Signature Algorithm %q not supported", alg)
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}
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}
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func rsaPKCS1v15SignatureAlgorithmForHashID(hashID crypto.Hash) *signatureAlgorithm {
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switch {
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case hashID == crypto.SHA512:
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return rs512
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case hashID == crypto.SHA384:
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return rs384
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case hashID == crypto.SHA256:
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fallthrough
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default:
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return rs256
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}
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}
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