FreeBSD/Linux Kernel Cross Reference
sys/geom/eli/g_eli.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2005-2019 Pawel Jakub Dawidek <pawel@dawidek.net>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _G_ELI_H_
    #define _G_ELI_H_
    
    #include <sys/endian.h>
    #include <sys/errno.h>
    #include <sys/malloc.h>
    #include <crypto/sha2/sha256.h>
    #include <crypto/sha2/sha512.h>
    #include <opencrypto/cryptodev.h>
    #ifdef _KERNEL
    #include <sys/bio.h>
    #include <sys/libkern.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <geom/geom.h>
    #include <crypto/intake.h>
    #else
    #include <assert.h>
    #include <stdio.h>
    #include <string.h>
    #include <strings.h>
    #endif
    #include <sys/queue.h>
    #include <sys/tree.h>
    #ifndef _OpenSSL_
    #include <sys/md5.h>
    #endif
    
    #define G_ELI_CLASS_NAME        "ELI"
    #define G_ELI_MAGIC             "GEOM::ELI"
    #define G_ELI_SUFFIX            ".eli"
    
    /*
     * Version history:
     * 0 - Initial version number.
     * 1 - Added data authentication support (md_aalgo field and
     *     G_ELI_FLAG_AUTH flag).
     * 2 - Added G_ELI_FLAG_READONLY.
     * 3 - Added 'configure' subcommand.
     * 4 - IV is generated from offset converted to little-endian
     *     (the G_ELI_FLAG_NATIVE_BYTE_ORDER flag will be set for older versions).
     * 5 - Added multiple encrypton keys and AES-XTS support.
     * 6 - Fixed usage of multiple keys for authenticated providers (the
     *     G_ELI_FLAG_FIRST_KEY flag will be set for older versions).
     * 7 - Encryption keys are now generated from the Data Key and not from the
     *     IV Key (the G_ELI_FLAG_ENC_IVKEY flag will be set for older versions).
     */
    #define G_ELI_VERSION_00        0
    #define G_ELI_VERSION_01        1
    #define G_ELI_VERSION_02        2
    #define G_ELI_VERSION_03        3
    #define G_ELI_VERSION_04        4
    #define G_ELI_VERSION_05        5
    #define G_ELI_VERSION_06        6
    #define G_ELI_VERSION_07        7
    #define G_ELI_VERSION           G_ELI_VERSION_07
    
    /* ON DISK FLAGS. */
    /* Use random, onetime keys. */
    #define G_ELI_FLAG_ONETIME              0x00000001
    /* Ask for the passphrase from the kernel, before mounting root. */
    #define G_ELI_FLAG_BOOT                 0x00000002
    /* Detach on last close, if we were open for writing. */
    #define G_ELI_FLAG_WO_DETACH            0x00000004
    /* Detach on last close. */
    #define G_ELI_FLAG_RW_DETACH            0x00000008
    /* Provide data authentication. */
    #define G_ELI_FLAG_AUTH                 0x00000010
    /* Provider is read-only, we should deny all write attempts. */
   #define G_ELI_FLAG_RO                   0x00000020
   /* Don't pass through BIO_DELETE requests. */
   #define G_ELI_FLAG_NODELETE             0x00000040
   /* This GELI supports GELIBoot */
   #define G_ELI_FLAG_GELIBOOT             0x00000080
   /* Hide passphrase length in GELIboot. */
   #define G_ELI_FLAG_GELIDISPLAYPASS      0x00000100
   /* Expand provider automatically. */
   #define G_ELI_FLAG_AUTORESIZE           0x00000200
   
   /* RUNTIME FLAGS. */
   /* Provider was open for writing. */
   #define G_ELI_FLAG_WOPEN                0x00010000
   /* Destroy device. */
   #define G_ELI_FLAG_DESTROY              0x00020000
   /* Provider uses native byte-order for IV generation. */
   #define G_ELI_FLAG_NATIVE_BYTE_ORDER    0x00040000
   /* Provider uses single encryption key. */
   #define G_ELI_FLAG_SINGLE_KEY           0x00080000
   /* Device suspended. */
   #define G_ELI_FLAG_SUSPEND              0x00100000
   /* Provider uses first encryption key. */
   #define G_ELI_FLAG_FIRST_KEY            0x00200000
   /* Provider uses IV-Key for encryption key generation. */
   #define G_ELI_FLAG_ENC_IVKEY            0x00400000
   
   /* BIO pflag values. */
   #define G_ELI_WORKER(pflags)    ((pflags) & 0xff)
   #define G_ELI_MAX_WORKERS       255
   #define G_ELI_NEW_BIO           G_ELI_MAX_WORKERS
   #define G_ELI_SETWORKER(pflags, w)      \
       (pflags) = ((pflags) & 0xff00) | ((w) & 0xff)
   #define G_ELI_SET_NEW_BIO(pflags)       G_ELI_SETWORKER((pflags), G_ELI_NEW_BIO)
   #define G_ELI_IS_NEW_BIO(pflags)        (G_ELI_WORKER(pflags) == G_ELI_NEW_BIO)
   #define G_ELI_UMA_ALLOC         0x100   /* bio_driver2 alloc came from UMA */
   
   #define SHA512_MDLEN            64
   #define G_ELI_AUTH_SECKEYLEN    SHA256_DIGEST_LENGTH
   
   #define G_ELI_MAXMKEYS          2
   #define G_ELI_MAXKEYLEN         64
   #define G_ELI_USERKEYLEN        G_ELI_MAXKEYLEN
   #define G_ELI_DATAKEYLEN        G_ELI_MAXKEYLEN
   #define G_ELI_AUTHKEYLEN        G_ELI_MAXKEYLEN
   #define G_ELI_IVKEYLEN          G_ELI_MAXKEYLEN
   #define G_ELI_SALTLEN           64
   #define G_ELI_DATAIVKEYLEN      (G_ELI_DATAKEYLEN + G_ELI_IVKEYLEN)
   /* Data-Key, IV-Key, HMAC_SHA512(Derived-Key, Data-Key+IV-Key) */
   #define G_ELI_MKEYLEN           (G_ELI_DATAIVKEYLEN + SHA512_MDLEN)
   #define G_ELI_OVERWRITES        5
   /* Switch data encryption key every 2^20 blocks. */
   #define G_ELI_KEY_SHIFT         20
   
   #define G_ELI_CRYPTO_UNKNOWN    0
   #define G_ELI_CRYPTO_HW         1
   #define G_ELI_CRYPTO_SW         2
   #define G_ELI_CRYPTO_SW_ACCEL   3
   
   #ifdef _KERNEL
   #if (MAX_KEY_BYTES < G_ELI_DATAIVKEYLEN)
   #error "MAX_KEY_BYTES is less than G_ELI_DATAKEYLEN"
   #endif
   
   extern int g_eli_debug;
   extern u_int g_eli_overwrites;
   extern u_int g_eli_batch;
   
   #define G_ELI_DEBUG(lvl, ...) \
       _GEOM_DEBUG("GEOM_ELI", g_eli_debug, (lvl), NULL, __VA_ARGS__)
   #define G_ELI_LOGREQ(lvl, bp, ...) \
       _GEOM_DEBUG("GEOM_ELI", g_eli_debug, (lvl), (bp), __VA_ARGS__)
   
   struct g_eli_worker {
           struct g_eli_softc      *w_softc;
           struct proc             *w_proc;
           void                    *w_first_key;
           u_int                    w_number;
           crypto_session_t         w_sid;
           boolean_t                w_active;
           LIST_ENTRY(g_eli_worker) w_next;
   };
   
   #endif  /* _KERNEL */
   
   struct g_eli_softc {
           struct g_geom   *sc_geom;
           u_int            sc_version;
           u_int            sc_crypto;
           uint8_t          sc_mkey[G_ELI_DATAIVKEYLEN];
           uint8_t          sc_ekey[G_ELI_DATAKEYLEN];
           TAILQ_HEAD(, g_eli_key) sc_ekeys_queue;
           RB_HEAD(g_eli_key_tree, g_eli_key) sc_ekeys_tree;
   #ifndef _STANDALONE
           struct mtx       sc_ekeys_lock;
   #endif
           uint64_t         sc_ekeys_total;
           uint64_t         sc_ekeys_allocated;
           u_int            sc_ealgo;
           u_int            sc_ekeylen;
           uint8_t          sc_akey[G_ELI_AUTHKEYLEN];
           u_int            sc_aalgo;
           u_int            sc_akeylen;
           u_int            sc_alen;
           SHA256_CTX       sc_akeyctx;
           uint8_t          sc_ivkey[G_ELI_IVKEYLEN];
           SHA256_CTX       sc_ivctx;
           int              sc_nkey;
           uint32_t         sc_flags;
           int              sc_inflight;
           off_t            sc_mediasize;
           size_t           sc_sectorsize;
           off_t            sc_provsize;
           u_int            sc_bytes_per_sector;
           u_int            sc_data_per_sector;
   #ifndef _KERNEL
           int              sc_cpubind;
   #else /* _KERNEL */
           boolean_t        sc_cpubind;
   
           /* Only for software cryptography. */
           struct bio_queue_head sc_queue;
           struct mtx       sc_queue_mtx;
           LIST_HEAD(, g_eli_worker) sc_workers;
   #endif /* _KERNEL */
   };
   #define sc_name          sc_geom->name
   
   #define G_ELI_KEY_MAGIC 0xe11341c
   
   struct g_eli_key {
           /* Key value, must be first in the structure. */
           uint8_t         gek_key[G_ELI_DATAKEYLEN];
           /* Magic. */
           int             gek_magic;
           /* Key number. */
           uint64_t        gek_keyno;
           /* Reference counter. */
           int             gek_count;
           /* Keeps keys sorted by most recent use. */
           TAILQ_ENTRY(g_eli_key) gek_next;
           /* Keeps keys sorted by number. */
           RB_ENTRY(g_eli_key) gek_link;
   };
   
   struct g_eli_metadata {
           char            md_magic[16];   /* Magic value. */
           uint32_t        md_version;     /* Version number. */
           uint32_t        md_flags;       /* Additional flags. */
           uint16_t        md_ealgo;       /* Encryption algorithm. */
           uint16_t        md_keylen;      /* Key length. */
           uint16_t        md_aalgo;       /* Authentication algorithm. */
           uint64_t        md_provsize;    /* Provider's size. */
           uint32_t        md_sectorsize;  /* Sector size. */
           uint8_t         md_keys;        /* Available keys. */
           int32_t         md_iterations;  /* Number of iterations for PKCS#5v2. */
           uint8_t         md_salt[G_ELI_SALTLEN]; /* Salt. */
                           /* Encrypted master key (IV-key, Data-key, HMAC). */
           uint8_t         md_mkeys[G_ELI_MAXMKEYS * G_ELI_MKEYLEN];
           u_char          md_hash[16];    /* MD5 hash. */
   } __packed;
   #ifndef _OpenSSL_
   static __inline void
   eli_metadata_encode_v0(struct g_eli_metadata *md, u_char **datap)
   {
           u_char *p;
   
           p = *datap;
           le32enc(p, md->md_flags);       p += sizeof(md->md_flags);
           le16enc(p, md->md_ealgo);       p += sizeof(md->md_ealgo);
           le16enc(p, md->md_keylen);      p += sizeof(md->md_keylen);
           le64enc(p, md->md_provsize);    p += sizeof(md->md_provsize);
           le32enc(p, md->md_sectorsize);  p += sizeof(md->md_sectorsize);
           *p = md->md_keys;               p += sizeof(md->md_keys);
           le32enc(p, md->md_iterations);  p += sizeof(md->md_iterations);
           bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt);
           bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
           *datap = p;
   }
   static __inline void
   eli_metadata_encode_v1v2v3v4v5v6v7(struct g_eli_metadata *md, u_char **datap)
   {
           u_char *p;
   
           p = *datap;
           le32enc(p, md->md_flags);       p += sizeof(md->md_flags);
           le16enc(p, md->md_ealgo);       p += sizeof(md->md_ealgo);
           le16enc(p, md->md_keylen);      p += sizeof(md->md_keylen);
           le16enc(p, md->md_aalgo);       p += sizeof(md->md_aalgo);
           le64enc(p, md->md_provsize);    p += sizeof(md->md_provsize);
           le32enc(p, md->md_sectorsize);  p += sizeof(md->md_sectorsize);
           *p = md->md_keys;               p += sizeof(md->md_keys);
           le32enc(p, md->md_iterations);  p += sizeof(md->md_iterations);
           bcopy(md->md_salt, p, sizeof(md->md_salt)); p += sizeof(md->md_salt);
           bcopy(md->md_mkeys, p, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
           *datap = p;
   }
   static __inline void
   eli_metadata_encode(struct g_eli_metadata *md, u_char *data)
   {
           uint32_t hash[4];
           MD5_CTX ctx;
           u_char *p;
   
           p = data;
           bcopy(md->md_magic, p, sizeof(md->md_magic));
           p += sizeof(md->md_magic);
           le32enc(p, md->md_version);
           p += sizeof(md->md_version);
           switch (md->md_version) {
           case G_ELI_VERSION_00:
                   eli_metadata_encode_v0(md, &p);
                   break;
           case G_ELI_VERSION_01:
           case G_ELI_VERSION_02:
           case G_ELI_VERSION_03:
           case G_ELI_VERSION_04:
           case G_ELI_VERSION_05:
           case G_ELI_VERSION_06:
           case G_ELI_VERSION_07:
                   eli_metadata_encode_v1v2v3v4v5v6v7(md, &p);
                   break;
           default:
   #ifdef _KERNEL
                   panic("%s: Unsupported version %u.", __func__,
                       (u_int)md->md_version);
   #else
                   assert(!"Unsupported metadata version.");
   #endif
           }
           MD5Init(&ctx);
           MD5Update(&ctx, data, p - data);
           MD5Final((void *)hash, &ctx);
           bcopy(hash, md->md_hash, sizeof(md->md_hash));
           bcopy(md->md_hash, p, sizeof(md->md_hash));
   }
   static __inline int
   eli_metadata_decode_v0(const u_char *data, struct g_eli_metadata *md)
   {
           uint32_t hash[4];
           MD5_CTX ctx;
           const u_char *p;
   
           p = data + sizeof(md->md_magic) + sizeof(md->md_version);
           md->md_flags = le32dec(p);      p += sizeof(md->md_flags);
           md->md_ealgo = le16dec(p);      p += sizeof(md->md_ealgo);
           md->md_keylen = le16dec(p);     p += sizeof(md->md_keylen);
           md->md_provsize = le64dec(p);   p += sizeof(md->md_provsize);
           md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize);
           md->md_keys = *p;               p += sizeof(md->md_keys);
           md->md_iterations = le32dec(p); p += sizeof(md->md_iterations);
           bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
           bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
           MD5Init(&ctx);
           MD5Update(&ctx, data, p - data);
           MD5Final((void *)hash, &ctx);
           bcopy(hash, md->md_hash, sizeof(md->md_hash));
           if (bcmp(md->md_hash, p, 16) != 0)
                   return (EINVAL);
           return (0);
   }
   
   static __inline int
   eli_metadata_decode_v1v2v3v4v5v6v7(const u_char *data, struct g_eli_metadata *md)
   {
           uint32_t hash[4];
           MD5_CTX ctx;
           const u_char *p;
   
           p = data + sizeof(md->md_magic) + sizeof(md->md_version);
           md->md_flags = le32dec(p);      p += sizeof(md->md_flags);
           md->md_ealgo = le16dec(p);      p += sizeof(md->md_ealgo);
           md->md_keylen = le16dec(p);     p += sizeof(md->md_keylen);
           md->md_aalgo = le16dec(p);      p += sizeof(md->md_aalgo);
           md->md_provsize = le64dec(p);   p += sizeof(md->md_provsize);
           md->md_sectorsize = le32dec(p); p += sizeof(md->md_sectorsize);
           md->md_keys = *p;               p += sizeof(md->md_keys);
           md->md_iterations = le32dec(p); p += sizeof(md->md_iterations);
           bcopy(p, md->md_salt, sizeof(md->md_salt)); p += sizeof(md->md_salt);
           bcopy(p, md->md_mkeys, sizeof(md->md_mkeys)); p += sizeof(md->md_mkeys);
           MD5Init(&ctx);
           MD5Update(&ctx, data, p - data);
           MD5Final((void *)hash, &ctx);
           bcopy(hash, md->md_hash, sizeof(md->md_hash));
           if (bcmp(md->md_hash, p, 16) != 0)
                   return (EINVAL);
           return (0);
   }
   static __inline int
   eli_metadata_decode(const u_char *data, struct g_eli_metadata *md)
   {
           int error;
   
           bcopy(data, md->md_magic, sizeof(md->md_magic));
           if (strcmp(md->md_magic, G_ELI_MAGIC) != 0)
                   return (EINVAL);
           md->md_version = le32dec(data + sizeof(md->md_magic));
           switch (md->md_version) {
           case G_ELI_VERSION_00:
                   error = eli_metadata_decode_v0(data, md);
                   break;
           case G_ELI_VERSION_01:
           case G_ELI_VERSION_02:
           case G_ELI_VERSION_03:
           case G_ELI_VERSION_04:
           case G_ELI_VERSION_05:
           case G_ELI_VERSION_06:
           case G_ELI_VERSION_07:
                   error = eli_metadata_decode_v1v2v3v4v5v6v7(data, md);
                   break;
           default:
                   error = EOPNOTSUPP;
                   break;
           }
           return (error);
   }
   #endif  /* !_OpenSSL */
   
   static __inline u_int
   g_eli_str2ealgo(const char *name)
   {
   
           if (strcasecmp("null", name) == 0)
                   return (CRYPTO_NULL_CBC);
           else if (strcasecmp("null-cbc", name) == 0)
                   return (CRYPTO_NULL_CBC);
           else if (strcasecmp("aes", name) == 0)
                   return (CRYPTO_AES_XTS);
           else if (strcasecmp("aes-cbc", name) == 0)
                   return (CRYPTO_AES_CBC);
           else if (strcasecmp("aes-xts", name) == 0)
                   return (CRYPTO_AES_XTS);
           else if (strcasecmp("camellia", name) == 0)
                   return (CRYPTO_CAMELLIA_CBC);
           else if (strcasecmp("camellia-cbc", name) == 0)
                   return (CRYPTO_CAMELLIA_CBC);
           return (CRYPTO_ALGORITHM_MIN - 1);
   }
   
   static __inline u_int
   g_eli_str2aalgo(const char *name)
   {
   
           if (strcasecmp("hmac/sha1", name) == 0)
                   return (CRYPTO_SHA1_HMAC);
           else if (strcasecmp("hmac/ripemd160", name) == 0)
                   return (CRYPTO_RIPEMD160_HMAC);
           else if (strcasecmp("hmac/sha256", name) == 0)
                   return (CRYPTO_SHA2_256_HMAC);
           else if (strcasecmp("hmac/sha384", name) == 0)
                   return (CRYPTO_SHA2_384_HMAC);
           else if (strcasecmp("hmac/sha512", name) == 0)
                   return (CRYPTO_SHA2_512_HMAC);
           return (CRYPTO_ALGORITHM_MIN - 1);
   }
   
   static __inline const char *
   g_eli_algo2str(u_int algo)
   {
   
           switch (algo) {
           case CRYPTO_NULL_CBC:
                   return ("NULL");
           case CRYPTO_AES_CBC:
                   return ("AES-CBC");
           case CRYPTO_AES_XTS:
                   return ("AES-XTS");
           case CRYPTO_CAMELLIA_CBC:
                   return ("CAMELLIA-CBC");
           case CRYPTO_SHA1_HMAC:
                   return ("HMAC/SHA1");
           case CRYPTO_RIPEMD160_HMAC:
                   return ("HMAC/RIPEMD160");
           case CRYPTO_SHA2_256_HMAC:
                   return ("HMAC/SHA256");
           case CRYPTO_SHA2_384_HMAC:
                   return ("HMAC/SHA384");
           case CRYPTO_SHA2_512_HMAC:
                   return ("HMAC/SHA512");
           }
           return ("unknown");
   }
   
   static __inline void
   eli_metadata_dump(const struct g_eli_metadata *md)
   {
           static const char hex[] = "0123456789abcdef";
           char str[sizeof(md->md_mkeys) * 2 + 1];
           u_int i;
   
           printf("     magic: %s\n", md->md_magic);
           printf("   version: %u\n", (u_int)md->md_version);
           printf("     flags: 0x%x\n", (u_int)md->md_flags);
           printf("     ealgo: %s\n", g_eli_algo2str(md->md_ealgo));
           printf("    keylen: %u\n", (u_int)md->md_keylen);
           if (md->md_flags & G_ELI_FLAG_AUTH)
                   printf("     aalgo: %s\n", g_eli_algo2str(md->md_aalgo));
           printf("  provsize: %ju\n", (uintmax_t)md->md_provsize);
           printf("sectorsize: %u\n", (u_int)md->md_sectorsize);
           printf("      keys: 0x%02x\n", (u_int)md->md_keys);
           printf("iterations: %d\n", (int)md->md_iterations);
           bzero(str, sizeof(str));
           for (i = 0; i < sizeof(md->md_salt); i++) {
                   str[i * 2] = hex[md->md_salt[i] >> 4];
                   str[i * 2 + 1] = hex[md->md_salt[i] & 0x0f];
           }
           printf("      Salt: %s\n", str);
           bzero(str, sizeof(str));
           for (i = 0; i < sizeof(md->md_mkeys); i++) {
                   str[i * 2] = hex[md->md_mkeys[i] >> 4];
                   str[i * 2 + 1] = hex[md->md_mkeys[i] & 0x0f];
           }
           printf("Master Key: %s\n", str);
           bzero(str, sizeof(str));
           for (i = 0; i < 16; i++) {
                   str[i * 2] = hex[md->md_hash[i] >> 4];
                   str[i * 2 + 1] = hex[md->md_hash[i] & 0x0f];
           }
           printf("  MD5 hash: %s\n", str);
   }
   
   #ifdef _KERNEL
   static __inline bool
   eli_metadata_crypto_supported(const struct g_eli_metadata *md)
   {
   
           switch (md->md_ealgo) {
           case CRYPTO_NULL_CBC:
           case CRYPTO_AES_CBC:
           case CRYPTO_CAMELLIA_CBC:
           case CRYPTO_AES_XTS:
                   break;
           default:
                   return (false);
           }
           if (md->md_flags & G_ELI_FLAG_AUTH) {
                   switch (md->md_aalgo) {
                   case CRYPTO_SHA1_HMAC:
                   case CRYPTO_RIPEMD160_HMAC:
                   case CRYPTO_SHA2_256_HMAC:
                   case CRYPTO_SHA2_384_HMAC:
                   case CRYPTO_SHA2_512_HMAC:
                           break;
                   default:
                           return (false);
                   }
           }
           return (true);
   }
   #endif
   
   static __inline u_int
   g_eli_keylen(u_int algo, u_int keylen)
   {
   
           switch (algo) {
           case CRYPTO_NULL_CBC:
                   if (keylen == 0)
                           keylen = 64 * 8;
                   else {
                           if (keylen > 64 * 8)
                                   keylen = 0;
                   }
                   return (keylen);
           case CRYPTO_AES_CBC:
           case CRYPTO_CAMELLIA_CBC:
                   switch (keylen) {
                   case 0:
                           return (128);
                   case 128:
                   case 192:
                   case 256:
                           return (keylen);
                   default:
                           return (0);
                   }
           case CRYPTO_AES_XTS:
                   switch (keylen) {
                   case 0:
                           return (128);
                   case 128:
                   case 256:
                           return (keylen);
                   default:
                           return (0);
                   }
           default:
                   return (0);
           }
   }
   
   static __inline u_int
   g_eli_ivlen(u_int algo)
   {
   
           switch (algo) {
           case CRYPTO_AES_XTS:
                   return (AES_XTS_IV_LEN);
           case CRYPTO_AES_CBC:
                   return (AES_BLOCK_LEN);
           case CRYPTO_CAMELLIA_CBC:
                   return (CAMELLIA_BLOCK_LEN);
           }
           return (0);
   }
   
   static __inline u_int
   g_eli_hashlen(u_int algo)
   {
   
           switch (algo) {
           case CRYPTO_SHA1_HMAC:
                   return (20);
           case CRYPTO_RIPEMD160_HMAC:
                   return (20);
           case CRYPTO_SHA2_256_HMAC:
                   return (32);
           case CRYPTO_SHA2_384_HMAC:
                   return (48);
           case CRYPTO_SHA2_512_HMAC:
                   return (64);
           }
           return (0);
   }
   
   static __inline off_t
   eli_mediasize(const struct g_eli_softc *sc, off_t mediasize, u_int sectorsize)
   {
   
           if ((sc->sc_flags & G_ELI_FLAG_ONETIME) == 0) {
                   mediasize -= sectorsize;
           }
           if ((sc->sc_flags & G_ELI_FLAG_AUTH) == 0) {
                   mediasize -= (mediasize % sc->sc_sectorsize);
           } else {
                   mediasize /= sc->sc_bytes_per_sector;
                   mediasize *= sc->sc_sectorsize;
           }
   
           return (mediasize);
   }
   
   static __inline void
   eli_metadata_softc(struct g_eli_softc *sc, const struct g_eli_metadata *md,
       u_int sectorsize, off_t mediasize)
   {
   
           sc->sc_version = md->md_version;
           sc->sc_inflight = 0;
           sc->sc_crypto = G_ELI_CRYPTO_UNKNOWN;
           sc->sc_flags = md->md_flags;
           /* Backward compatibility. */
           if (md->md_version < G_ELI_VERSION_04)
                   sc->sc_flags |= G_ELI_FLAG_NATIVE_BYTE_ORDER;
           if (md->md_version < G_ELI_VERSION_05)
                   sc->sc_flags |= G_ELI_FLAG_SINGLE_KEY;
           if (md->md_version < G_ELI_VERSION_06 &&
               (sc->sc_flags & G_ELI_FLAG_AUTH) != 0) {
                   sc->sc_flags |= G_ELI_FLAG_FIRST_KEY;
           }
           if (md->md_version < G_ELI_VERSION_07)
                   sc->sc_flags |= G_ELI_FLAG_ENC_IVKEY;
           sc->sc_ealgo = md->md_ealgo;
   
           if (sc->sc_flags & G_ELI_FLAG_AUTH) {
                   sc->sc_akeylen = sizeof(sc->sc_akey) * 8;
                   sc->sc_aalgo = md->md_aalgo;
                   sc->sc_alen = g_eli_hashlen(sc->sc_aalgo);
   
                   sc->sc_data_per_sector = sectorsize - sc->sc_alen;
                   /*
                    * Some hash functions (like SHA1 and RIPEMD160) generates hash
                    * which length is not multiple of 128 bits, but we want data
                    * length to be multiple of 128, so we can encrypt without
                    * padding. The line below rounds down data length to multiple
                    * of 128 bits.
                    */
                   sc->sc_data_per_sector -= sc->sc_data_per_sector % 16;
   
                   sc->sc_bytes_per_sector =
                       (md->md_sectorsize - 1) / sc->sc_data_per_sector + 1;
                   sc->sc_bytes_per_sector *= sectorsize;
           }
           sc->sc_provsize = mediasize;
           sc->sc_sectorsize = md->md_sectorsize;
           sc->sc_mediasize = eli_mediasize(sc, mediasize, sectorsize);
           sc->sc_ekeylen = md->md_keylen;
   }
   
   #ifdef _KERNEL
   int g_eli_read_metadata(struct g_class *mp, struct g_provider *pp,
       struct g_eli_metadata *md);
   struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp,
       struct g_provider *bpp, const struct g_eli_metadata *md,
       const u_char *mkey, int nkey);
   int g_eli_destroy(struct g_eli_softc *sc, boolean_t force);
   
   int g_eli_access(struct g_provider *pp, int dr, int dw, int de);
   void g_eli_config(struct gctl_req *req, struct g_class *mp, const char *verb);
   
   void g_eli_read_done(struct bio *bp);
   void g_eli_write_done(struct bio *bp);
   int g_eli_crypto_rerun(struct cryptop *crp);
   
   bool g_eli_alloc_data(struct bio *bp, int sz);
   void g_eli_free_data(struct bio *bp);
   
   void g_eli_crypto_read(struct g_eli_softc *sc, struct bio *bp, boolean_t fromworker);
   void g_eli_crypto_run(struct g_eli_worker *wr, struct bio *bp);
   
   void g_eli_auth_read(struct g_eli_softc *sc, struct bio *bp);
   void g_eli_auth_run(struct g_eli_worker *wr, struct bio *bp);
   #endif
   void g_eli_crypto_ivgen(struct g_eli_softc *sc, off_t offset, u_char *iv,
       size_t size);
   
   void g_eli_mkey_hmac(unsigned char *mkey, const unsigned char *key);
   int g_eli_mkey_decrypt(const struct g_eli_metadata *md,
       const unsigned char *key, unsigned char *mkey, unsigned keyp);
   int g_eli_mkey_decrypt_any(const struct g_eli_metadata *md,
       const unsigned char *key, unsigned char *mkey, unsigned *nkeyp);
   int g_eli_mkey_encrypt(unsigned algo, const unsigned char *key, unsigned keylen,
       unsigned char *mkey);
   #ifdef _KERNEL
   void g_eli_mkey_propagate(struct g_eli_softc *sc, const unsigned char *mkey);
   #endif
   
   int g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize,
       const u_char *key, size_t keysize);
   int g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize,
       const u_char *key, size_t keysize);
   
   struct hmac_ctx {
           SHA512_CTX      innerctx;
           SHA512_CTX      outerctx;
   };
   
   void g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const char *hkey,
       size_t hkeylen);
   void g_eli_crypto_hmac_update(struct hmac_ctx *ctx, const uint8_t *data,
       size_t datasize);
   void g_eli_crypto_hmac_final(struct hmac_ctx *ctx, uint8_t *md, size_t mdsize);
   void g_eli_crypto_hmac(const char *hkey, size_t hkeysize,
       const uint8_t *data, size_t datasize, uint8_t *md, size_t mdsize);
   
   void g_eli_key_fill(struct g_eli_softc *sc, struct g_eli_key *key,
       uint64_t keyno);
   #ifdef _KERNEL
   void g_eli_key_init(struct g_eli_softc *sc);
   void g_eli_key_destroy(struct g_eli_softc *sc);
   void g_eli_key_resize(struct g_eli_softc *sc);
   uint8_t *g_eli_key_hold(struct g_eli_softc *sc, off_t offset, size_t blocksize);
   void g_eli_key_drop(struct g_eli_softc *sc, uint8_t *rawkey);
   #endif
   #endif  /* !_G_ELI_H_ */

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