Source file src/github.com/lestrrat-go/jwx/jwe/internal/content_crypt/content_crypt.go

Documentation: github.com/lestrrat-go/jwx/jwe/internal/content_crypt

     1  package content_crypt //nolint:golint
     2  
     3  import (
     4  	"github.com/lestrrat-go/jwx/jwa"
     5  	"github.com/lestrrat-go/jwx/jwe/internal/cipher"
     6  	"github.com/pkg/errors"
     7  )
     8  
     9  func (c Generic) Algorithm() jwa.ContentEncryptionAlgorithm {
    10  	return c.alg
    11  }
    12  
    13  func (c Generic) Encrypt(cek, plaintext, aad []byte) ([]byte, []byte, []byte, error) {
    14  	iv, encrypted, tag, err := c.cipher.Encrypt(cek, plaintext, aad)
    15  	if err != nil {
    16  		return nil, nil, nil, errors.Wrap(err, `failed to crypt content`)
    17  	}
    18  
    19  	return iv, encrypted, tag, nil
    20  }
    21  
    22  func (c Generic) Decrypt(cek, iv, ciphertext, tag, aad []byte) ([]byte, error) {
    23  	return c.cipher.Decrypt(cek, iv, ciphertext, tag, aad)
    24  }
    25  
    26  func NewGeneric(alg jwa.ContentEncryptionAlgorithm) (*Generic, error) {
    27  	c, err := cipher.NewAES(alg)
    28  	if err != nil {
    29  		return nil, errors.Wrap(err, `aes crypt: failed to create content cipher`)
    30  	}
    31  
    32  	return &Generic{
    33  		alg:     alg,
    34  		cipher:  c,
    35  		keysize: c.KeySize(),
    36  		tagsize: 16,
    37  	}, nil
    38  }
    39  
    40  func (c Generic) KeySize() int {
    41  	return c.keysize
    42  }
    43  

View as plain text