cbc.h

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#ifndef _IPXE_CBC_H
#define _IPXE_CBC_H
 
/** @file
 *
 * Cipher-block chaining
 *
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
#include <ipxe/crypto.h>
 
/** A cipher-block chaining mode context */
#define cbc_context_t( blocksize, ctxsize )                             \
        struct {                                                        \
                uint8_t cbc[ (blocksize) ];                             \
                uint8_t raw[ (ctxsize) - (blocksize) ];                 \
        }
 
extern int cbc_setkey ( struct cipher_algorithm *cipher, void *ctx,
                        const void *key, size_t keylen );
extern int cbc_setiv ( struct cipher_algorithm *cipher, void *ctx,
                       const void *iv, size_t ivlen );
extern void cbc_encrypt ( struct cipher_algorithm *cipher, void *ctx,
                          const void *src, void *dst, size_t len );
extern void cbc_decrypt ( struct cipher_algorithm *cipher, void *ctx,
                          const void *src, void *dst, size_t len );
 
/**
 * Create a cipher-block chaining mode of behaviour of an existing cipher
 *
 * @v _cbc_name         Name for the new CBC cipher
 * @v _cbc_cipher       New cipher algorithm
 * @v _raw_cipher       Underlying cipher algorithm
 * @v _raw_context      Context structure for the underlying cipher
 * @v _blocksize        Cipher block size
 */
#define CBC_CIPHER( _cbc_name, _cbc_cipher, _raw_cipher, _raw_context,  \
                    _blocksize )                                        \
struct cipher_algorithm _cbc_cipher = {                                 \
        .name           = #_cbc_name,                                   \
        .ctxsize        = ( _blocksize + sizeof ( _raw_context ) ),     \
        .blocksize      = _blocksize,                                   \
        .alignsize      = _blocksize,                                   \
        .authsize       = 0,                                            \
        .confidential   = 1,                                            \
        .setkey         = cbc_setkey,                                   \
        .setiv          = cbc_setiv,                                    \
        .encrypt        = cbc_encrypt,                                  \
        .decrypt        = cbc_decrypt,                                  \
        .auth           = cipher_null_auth,                             \
        .priv           = &_raw_cipher,                                 \
};
 
#endif /* _IPXE_CBC_H */