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// Copyright 2018 Thales e-Security, Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
package crypto11
import (
"fmt"
"github.com/miekg/pkcs11"
)
// cipher.Block ---------------------------------------------------------
// BlockSize returns the cipher's block size in bytes.
func (key *SecretKey) BlockSize() int {
return key.Cipher.BlockSize
}
// Decrypt decrypts the first block in src into dst.
// Dst and src must overlap entirely or not at all.
//
// Using this method for bulk operation is very inefficient, as it makes a round trip to the HSM
// (which may be network-connected) for each block.
// For more efficient operation, see NewCBCDecrypterCloser, NewCBCDecrypter or NewCBC.
func (key *SecretKey) Decrypt(dst, src []byte) {
var result []byte
if err := key.context.withSession(func(session *pkcs11Session) (err error) {
mech := []*pkcs11.Mechanism{pkcs11.NewMechanism(key.Cipher.ECBMech, nil)}
if err = session.ctx.DecryptInit(session.handle, mech, key.handle); err != nil {
return
}
if result, err = session.ctx.Decrypt(session.handle, src[:key.Cipher.BlockSize]); err != nil {
return
}
if len(result) != key.Cipher.BlockSize {
err = fmt.Errorf("C_Decrypt: returned %v bytes, wanted %v", len(result), key.Cipher.BlockSize)
return
}
return
}); err != nil {
panic(err)
} else {
copy(dst[:key.Cipher.BlockSize], result)
}
}
// Encrypt encrypts the first block in src into dst.
// Dst and src must overlap entirely or not at all.
//
// Using this method for bulk operation is very inefficient, as it makes a round trip to the HSM
// (which may be network-connected) for each block.
// For more efficient operation, see NewCBCEncrypterCloser, NewCBCEncrypter or NewCBC.
func (key *SecretKey) Encrypt(dst, src []byte) {
var result []byte
if err := key.context.withSession(func(session *pkcs11Session) (err error) {
mech := []*pkcs11.Mechanism{pkcs11.NewMechanism(key.Cipher.ECBMech, nil)}
if err = session.ctx.EncryptInit(session.handle, mech, key.handle); err != nil {
return
}
if result, err = session.ctx.Encrypt(session.handle, src[:key.Cipher.BlockSize]); err != nil {
return
}
if len(result) != key.Cipher.BlockSize {
err = fmt.Errorf("C_Encrypt: unexpectedly returned %v bytes, wanted %v", len(result), key.Cipher.BlockSize)
return
}
return
}); err != nil {
panic(err)
} else {
copy(dst[:key.Cipher.BlockSize], result)
}
}
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