X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=crypto%2Fxcbc.c;h=1e30b31f33c68ab0d19381ae61d91ec76290928f;hb=0044f3eda9a778ab63c2a5eafede3803f01b0b97;hp=2feb0f239c38179c579cbead01e7fe168d4ea0dd;hpb=2f40a178e70030c4712fe63807c883f34c3645eb;p=safe%2Fjmp%2Flinux-2.6 diff --git a/crypto/xcbc.c b/crypto/xcbc.c index 2feb0f23..1e30b31 100644 --- a/crypto/xcbc.c +++ b/crypto/xcbc.c @@ -19,210 +19,142 @@ * Kazunori Miyazawa */ -#include -#include +#include #include -#include #include -#include -#include -#include -#include static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101, 0x02020202, 0x02020202, 0x02020202, 0x02020202, 0x03030303, 0x03030303, 0x03030303, 0x03030303}; + /* * +------------------------ * | * +------------------------ - * | crypto_xcbc_ctx + * | xcbc_tfm_ctx * +------------------------ - * | odds (block size) + * | consts (block size * 2) * +------------------------ - * | prev (block size) + */ +struct xcbc_tfm_ctx { + struct crypto_cipher *child; + u8 ctx[]; +}; + +/* * +------------------------ - * | key (block size) + * | * +------------------------ - * | consts (block size * 3) + * | xcbc_desc_ctx + * +------------------------ + * | odds (block size) + * +------------------------ + * | prev (block size) * +------------------------ */ -struct crypto_xcbc_ctx { - struct crypto_cipher *child; - u8 *odds; - u8 *prev; - u8 *key; - u8 *consts; - void (*xor)(u8 *a, const u8 *b, unsigned int bs); - unsigned int keylen; +struct xcbc_desc_ctx { unsigned int len; + u8 ctx[]; }; -static void xor_128(u8 *a, const u8 *b, unsigned int bs) -{ - ((u32 *)a)[0] ^= ((u32 *)b)[0]; - ((u32 *)a)[1] ^= ((u32 *)b)[1]; - ((u32 *)a)[2] ^= ((u32 *)b)[2]; - ((u32 *)a)[3] ^= ((u32 *)b)[3]; -} - -static int _crypto_xcbc_digest_setkey(struct crypto_hash *parent, - struct crypto_xcbc_ctx *ctx) +static int crypto_xcbc_digest_setkey(struct crypto_shash *parent, + const u8 *inkey, unsigned int keylen) { - int bs = crypto_hash_blocksize(parent); + unsigned long alignmask = crypto_shash_alignmask(parent); + struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent); + int bs = crypto_shash_blocksize(parent); + u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); int err = 0; u8 key1[bs]; - if ((err = crypto_cipher_setkey(ctx->child, ctx->key, ctx->keylen))) - return err; + if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen))) + return err; - crypto_cipher_encrypt_one(ctx->child, key1, ctx->consts); + crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs); + crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2); + crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks); return crypto_cipher_setkey(ctx->child, key1, bs); -} - -static int crypto_xcbc_digest_setkey(struct crypto_hash *parent, - const u8 *inkey, unsigned int keylen) -{ - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent); - - if (keylen != crypto_cipher_blocksize(ctx->child)) - return -EINVAL; - ctx->keylen = keylen; - memcpy(ctx->key, inkey, keylen); - ctx->consts = (u8*)ks; - - return _crypto_xcbc_digest_setkey(parent, ctx); } -static int crypto_xcbc_digest_init(struct hash_desc *pdesc) +static int crypto_xcbc_digest_init(struct shash_desc *pdesc) { - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(pdesc->tfm); - int bs = crypto_hash_blocksize(pdesc->tfm); + unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm); + struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); + int bs = crypto_shash_blocksize(pdesc->tfm); + u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs; ctx->len = 0; - memset(ctx->odds, 0, bs); - memset(ctx->prev, 0, bs); + memset(prev, 0, bs); return 0; } -static int crypto_xcbc_digest_update2(struct hash_desc *pdesc, - struct scatterlist *sg, - unsigned int nbytes) +static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p, + unsigned int len) { - struct crypto_hash *parent = pdesc->tfm; - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent); - struct crypto_cipher *tfm = ctx->child; - int bs = crypto_hash_blocksize(parent); - unsigned int i = 0; - - do { - - struct page *pg = sg_page(&sg[i]); - unsigned int offset = sg[i].offset; - unsigned int slen = sg[i].length; - - if (unlikely(slen > nbytes)) - slen = nbytes; - - nbytes -= slen; - - while (slen > 0) { - unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset); - char *p = crypto_kmap(pg, 0) + offset; - - /* checking the data can fill the block */ - if ((ctx->len + len) <= bs) { - memcpy(ctx->odds + ctx->len, p, len); - ctx->len += len; - slen -= len; - - /* checking the rest of the page */ - if (len + offset >= PAGE_SIZE) { - offset = 0; - pg++; - } else - offset += len; - - crypto_kunmap(p, 0); - crypto_yield(pdesc->flags); - continue; - } - - /* filling odds with new data and encrypting it */ - memcpy(ctx->odds + ctx->len, p, bs - ctx->len); - len -= bs - ctx->len; - p += bs - ctx->len; - - ctx->xor(ctx->prev, ctx->odds, bs); - crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev); - - /* clearing the length */ - ctx->len = 0; - - /* encrypting the rest of data */ - while (len > bs) { - ctx->xor(ctx->prev, p, bs); - crypto_cipher_encrypt_one(tfm, ctx->prev, - ctx->prev); - p += bs; - len -= bs; - } - - /* keeping the surplus of blocksize */ - if (len) { - memcpy(ctx->odds, p, len); - ctx->len = len; - } - crypto_kunmap(p, 0); - crypto_yield(pdesc->flags); - slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset); - offset = 0; - pg++; - } - i++; - } while (nbytes>0); - - return 0; -} + struct crypto_shash *parent = pdesc->tfm; + unsigned long alignmask = crypto_shash_alignmask(parent); + struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); + struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); + struct crypto_cipher *tfm = tctx->child; + int bs = crypto_shash_blocksize(parent); + u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); + u8 *prev = odds + bs; + + /* checking the data can fill the block */ + if ((ctx->len + len) <= bs) { + memcpy(odds + ctx->len, p, len); + ctx->len += len; + return 0; + } -static int crypto_xcbc_digest_update(struct hash_desc *pdesc, - struct scatterlist *sg, - unsigned int nbytes) -{ - if (WARN_ON_ONCE(in_irq())) - return -EDEADLK; - return crypto_xcbc_digest_update2(pdesc, sg, nbytes); -} + /* filling odds with new data and encrypting it */ + memcpy(odds + ctx->len, p, bs - ctx->len); + len -= bs - ctx->len; + p += bs - ctx->len; -static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out) -{ - struct crypto_hash *parent = pdesc->tfm; - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent); - struct crypto_cipher *tfm = ctx->child; - int bs = crypto_hash_blocksize(parent); - int err = 0; + crypto_xor(prev, odds, bs); + crypto_cipher_encrypt_one(tfm, prev, prev); - if (ctx->len == bs) { - u8 key2[bs]; + /* clearing the length */ + ctx->len = 0; - if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0) - return err; + /* encrypting the rest of data */ + while (len > bs) { + crypto_xor(prev, p, bs); + crypto_cipher_encrypt_one(tfm, prev, prev); + p += bs; + len -= bs; + } - crypto_cipher_encrypt_one(tfm, key2, - (u8 *)(ctx->consts + bs)); + /* keeping the surplus of blocksize */ + if (len) { + memcpy(odds, p, len); + ctx->len = len; + } - ctx->xor(ctx->prev, ctx->odds, bs); - ctx->xor(ctx->prev, key2, bs); - _crypto_xcbc_digest_setkey(parent, ctx); + return 0; +} - crypto_cipher_encrypt_one(tfm, out, ctx->prev); - } else { - u8 key3[bs]; +static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out) +{ + struct crypto_shash *parent = pdesc->tfm; + unsigned long alignmask = crypto_shash_alignmask(parent); + struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); + struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); + struct crypto_cipher *tfm = tctx->child; + int bs = crypto_shash_blocksize(parent); + u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1); + u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); + u8 *prev = odds + bs; + unsigned int offset = 0; + + if (ctx->len != bs) { unsigned int rlen; - u8 *p = ctx->odds + ctx->len; + u8 *p = odds + ctx->len; + *p = 0x80; p++; @@ -230,32 +162,15 @@ static int crypto_xcbc_digest_final(struct hash_desc *pdesc, u8 *out) if (rlen) memset(p, 0, rlen); - if ((err = crypto_cipher_setkey(tfm, ctx->key, ctx->keylen)) != 0) - return err; - - crypto_cipher_encrypt_one(tfm, key3, - (u8 *)(ctx->consts + bs * 2)); - - ctx->xor(ctx->prev, ctx->odds, bs); - ctx->xor(ctx->prev, key3, bs); - - _crypto_xcbc_digest_setkey(parent, ctx); - - crypto_cipher_encrypt_one(tfm, out, ctx->prev); + offset += bs; } - return 0; -} + crypto_xor(prev, odds, bs); + crypto_xor(prev, consts + offset, bs); -static int crypto_xcbc_digest(struct hash_desc *pdesc, - struct scatterlist *sg, unsigned int nbytes, u8 *out) -{ - if (WARN_ON_ONCE(in_irq())) - return -EDEADLK; + crypto_cipher_encrypt_one(tfm, out, prev); - crypto_xcbc_digest_init(pdesc); - crypto_xcbc_digest_update2(pdesc, sg, nbytes); - return crypto_xcbc_digest_final(pdesc, out); + return 0; } static int xcbc_init_tfm(struct crypto_tfm *tfm) @@ -263,95 +178,93 @@ static int xcbc_init_tfm(struct crypto_tfm *tfm) struct crypto_cipher *cipher; struct crypto_instance *inst = (void *)tfm->__crt_alg; struct crypto_spawn *spawn = crypto_instance_ctx(inst); - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm)); - int bs = crypto_hash_blocksize(__crypto_hash_cast(tfm)); + struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); cipher = crypto_spawn_cipher(spawn); if (IS_ERR(cipher)) return PTR_ERR(cipher); - switch(bs) { - case 16: - ctx->xor = xor_128; - break; - default: - return -EINVAL; - } - ctx->child = cipher; - ctx->odds = (u8*)(ctx+1); - ctx->prev = ctx->odds + bs; - ctx->key = ctx->prev + bs; return 0; }; static void xcbc_exit_tfm(struct crypto_tfm *tfm) { - struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(__crypto_hash_cast(tfm)); + struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); crypto_free_cipher(ctx->child); } -static struct crypto_instance *xcbc_alloc(struct rtattr **tb) +static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb) { - struct crypto_instance *inst; + struct shash_instance *inst; struct crypto_alg *alg; int err; - err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_HASH); + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); if (err) - return ERR_PTR(err); + return err; alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK); if (IS_ERR(alg)) - return ERR_CAST(alg); + return PTR_ERR(alg); switch(alg->cra_blocksize) { case 16: break; default: - inst = ERR_PTR(-EINVAL); goto out_put_alg; } - inst = crypto_alloc_instance("xcbc", alg); + inst = shash_alloc_instance("xcbc", alg); + err = PTR_ERR(inst); if (IS_ERR(inst)) goto out_put_alg; - inst->alg.cra_flags = CRYPTO_ALG_TYPE_HASH; - inst->alg.cra_priority = alg->cra_priority; - inst->alg.cra_blocksize = alg->cra_blocksize; - inst->alg.cra_alignmask = alg->cra_alignmask; - inst->alg.cra_type = &crypto_hash_type; - - inst->alg.cra_hash.digestsize = alg->cra_blocksize; - inst->alg.cra_ctxsize = sizeof(struct crypto_xcbc_ctx) + - ALIGN(inst->alg.cra_blocksize * 3, sizeof(void *)); - inst->alg.cra_init = xcbc_init_tfm; - inst->alg.cra_exit = xcbc_exit_tfm; - - inst->alg.cra_hash.init = crypto_xcbc_digest_init; - inst->alg.cra_hash.update = crypto_xcbc_digest_update; - inst->alg.cra_hash.final = crypto_xcbc_digest_final; - inst->alg.cra_hash.digest = crypto_xcbc_digest; - inst->alg.cra_hash.setkey = crypto_xcbc_digest_setkey; + err = crypto_init_spawn(shash_instance_ctx(inst), alg, + shash_crypto_instance(inst), + CRYPTO_ALG_TYPE_MASK); + if (err) + goto out_free_inst; + + inst->alg.base.cra_priority = alg->cra_priority; + inst->alg.base.cra_blocksize = alg->cra_blocksize; + inst->alg.base.cra_alignmask = alg->cra_alignmask | 3; + + inst->alg.digestsize = alg->cra_blocksize; + inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx), + crypto_tfm_ctx_alignment()) + + (alg->cra_alignmask & + ~(crypto_tfm_ctx_alignment() - 1)) + + alg->cra_blocksize * 2; + + inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx), + alg->cra_alignmask) + + alg->cra_blocksize * 2; + inst->alg.base.cra_init = xcbc_init_tfm; + inst->alg.base.cra_exit = xcbc_exit_tfm; + + inst->alg.init = crypto_xcbc_digest_init; + inst->alg.update = crypto_xcbc_digest_update; + inst->alg.final = crypto_xcbc_digest_final; + inst->alg.setkey = crypto_xcbc_digest_setkey; + + err = shash_register_instance(tmpl, inst); + if (err) { +out_free_inst: + shash_free_instance(shash_crypto_instance(inst)); + } out_put_alg: crypto_mod_put(alg); - return inst; -} - -static void xcbc_free(struct crypto_instance *inst) -{ - crypto_drop_spawn(crypto_instance_ctx(inst)); - kfree(inst); + return err; } static struct crypto_template crypto_xcbc_tmpl = { .name = "xcbc", - .alloc = xcbc_alloc, - .free = xcbc_free, + .create = xcbc_create, + .free = shash_free_instance, .module = THIS_MODULE, };