FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/xform_enc.h

     /*      $FreeBSD$       */
     /*      $OpenBSD: xform.h,v 1.8 2001/08/28 12:20:43 ben Exp $   */
     
     /*-
      * The author of this code is Angelos D. Keromytis (angelos@cis.upenn.edu)
      *
      * This code was written by Angelos D. Keromytis in Athens, Greece, in
      * February 2000. Network Security Technologies Inc. (NSTI) kindly
      * supported the development of this code.
     *
     * Copyright (c) 2000 Angelos D. Keromytis
     * Copyright (c) 2014 The FreeBSD Foundation
     * All rights reserved.
     *
     * Portions of this software were developed by John-Mark Gurney
     * under sponsorship of the FreeBSD Foundation and
     * Rubicon Communications, LLC (Netgate).
     *
     * Permission to use, copy, and modify this software without fee
     * is hereby granted, provided that this entire notice is included in
     * all source code copies of any software which is or includes a copy or
     * modification of this software. 
     *
     * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
     * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
     * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
     * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
     * PURPOSE.
     */
    
    #ifndef _CRYPTO_XFORM_ENC_H_
    #define _CRYPTO_XFORM_ENC_H_
    
    #include <sys/types.h>
    
    #include <crypto/rijndael/rijndael.h>
    #include <crypto/camellia/camellia.h>
    #include <opencrypto/cryptodev.h>
    #ifdef _STANDALONE
    #include <stand.h>
    #endif
    
    #define AESICM_BLOCKSIZE        AES_BLOCK_LEN
    #define AES_XTS_BLOCKSIZE       16
    #define AES_XTS_IVSIZE          8
    #define AES_XTS_ALPHA           0x87    /* GF(2^128) generator polynomial */
    
    /* Declarations */
    struct enc_xform {
            int type;
            const char *name;
            size_t ctxsize;
            uint16_t blocksize;     /* Required input block size -- 1 for stream ciphers. */
            uint16_t native_blocksize;      /* Used for stream ciphers. */
            uint16_t ivsize;
            uint16_t minkey, maxkey;
            uint16_t macsize;               /* For AEAD ciphers. */
    
            /* Initialize context and set key. */
            int (*setkey) (void *, const uint8_t *, int len);
    
            /* Supply context with nonce/IV. */
            void (*reinit) (void *, const uint8_t *, size_t);
    
            /*
             * Encrypt/decrypt a single block.  For stream ciphers this
             * encrypts/decrypts a single "native" block.
             */
            void (*encrypt) (void *, const uint8_t *, uint8_t *);
            void (*decrypt) (void *, const uint8_t *, uint8_t *);
    
            /*
             * Encrypt/decrypt multiple blocks.  For stream ciphers this
             * encrypts/decrypts multiple "native" blocks.  The fourth
             * argument is a count of bytes.
             */
            void (*encrypt_multi) (void *, const uint8_t *, uint8_t *, size_t);
            void (*decrypt_multi) (void *, const uint8_t *, uint8_t *, size_t);
    
            /*
             * For stream ciphers, encrypt/decrypt the final partial block
             * of 'len' bytes.
             */
            void (*encrypt_last) (void *, const uint8_t *, uint8_t *, size_t len);
            void (*decrypt_last) (void *, const uint8_t *, uint8_t *, size_t len);
    
            /*
             * For AEAD ciphers, update and generate MAC/tag.
             */
            int  (*update) (void *, const void *, u_int);
            void (*final) (uint8_t *, void *);
    };
    
    
    extern const struct enc_xform enc_xform_null;
    extern const struct enc_xform enc_xform_aes_cbc;
    extern const struct enc_xform enc_xform_aes_icm;
    extern const struct enc_xform enc_xform_aes_nist_gcm;
    extern const struct enc_xform enc_xform_aes_nist_gmac;
   extern const struct enc_xform enc_xform_aes_xts;
   extern const struct enc_xform enc_xform_camellia;
   extern const struct enc_xform enc_xform_chacha20;
   extern const struct enc_xform enc_xform_chacha20_poly1305;
   extern const struct enc_xform enc_xform_xchacha20_poly1305;
   extern const struct enc_xform enc_xform_ccm;
   
   struct aes_icm_ctx {
           uint32_t        ac_ek[4*(RIJNDAEL_MAXNR + 1)];
           /* ac_block is initialized to IV */
           uint8_t         ac_block[AESICM_BLOCKSIZE];
           int             ac_nr;
   };
   
   struct aes_xts_ctx {
           rijndael_ctx key1;
           rijndael_ctx key2;
           uint8_t tweak[AES_XTS_BLOCKSIZE];
   };
   
   #endif /* _CRYPTO_XFORM_ENC_H_ */

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