44 lines
1002 B
Go
44 lines
1002 B
Go
package content_crypt //nolint:golint
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import (
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"fmt"
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"github.com/lestrrat-go/jwx/v2/jwa"
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"github.com/lestrrat-go/jwx/v2/jwe/internal/cipher"
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)
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func (c Generic) Algorithm() jwa.ContentEncryptionAlgorithm {
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return c.alg
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}
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func (c Generic) Encrypt(cek, plaintext, aad []byte) ([]byte, []byte, []byte, error) {
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iv, encrypted, tag, err := c.cipher.Encrypt(cek, plaintext, aad)
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if err != nil {
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return nil, nil, nil, fmt.Errorf(`failed to crypt content: %w`, err)
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}
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return iv, encrypted, tag, nil
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}
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func (c Generic) Decrypt(cek, iv, ciphertext, tag, aad []byte) ([]byte, error) {
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return c.cipher.Decrypt(cek, iv, ciphertext, tag, aad)
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}
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func NewGeneric(alg jwa.ContentEncryptionAlgorithm) (*Generic, error) {
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c, err := cipher.NewAES(alg)
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if err != nil {
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return nil, fmt.Errorf(`aes crypt: failed to create content cipher: %w`, err)
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}
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return &Generic{
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alg: alg,
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cipher: c,
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keysize: c.KeySize(),
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tagsize: 16,
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}, nil
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}
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func (c Generic) KeySize() int {
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return c.keysize
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}
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