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SubjectRe: [PATCH/proposal] dm-crypt: add digest-based iv generation mode
Hi,

I just hacked together what I wrote. Compiles but untested.

diff -Nur linux.orig/crypto/api.c linux/crypto/api.c
--- linux.orig/crypto/api.c 2004-02-27 19:25:58.445326056 +0100
+++ linux/crypto/api.c 2004-02-27 19:26:44.451332080 +0100
@@ -96,6 +96,26 @@
return -EINVAL;
}

+static int crypto_copy_ops(struct crypto_tfm *tfm)
+{
+ switch (crypto_tfm_alg_type(tfm)) {
+ case CRYPTO_ALG_TYPE_CIPHER:
+ return crypto_copy_cipher_ops(tfm);
+
+ case CRYPTO_ALG_TYPE_DIGEST:
+ return crypto_copy_digest_ops(tfm);
+
+ case CRYPTO_ALG_TYPE_COMPRESS:
+ return crypto_copy_compress_ops(tfm);
+
+ default:
+ break;
+ }
+
+ BUG();
+ return -EINVAL;
+}
+
static void crypto_exit_ops(struct crypto_tfm *tfm)
{
switch (crypto_tfm_alg_type(tfm)) {
@@ -117,6 +137,62 @@
}
}

+static int __crypto_init_tfm(struct crypto_tfm *tfm, struct crypto_alg *alg,
+ u32 flags)
+{
+ memset(tfm, 0, crypto_alg_tfm_size(alg));
+
+ tfm->__crt_alg = alg;
+
+ if (crypto_init_flags(tfm, flags))
+ return -EINVAL;
+
+ if (crypto_init_ops(tfm)) {
+ crypto_exit_ops(tfm);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+unsigned int crypto_lookup_alg_tfm_size(const char *name, u32 flags)
+{
+ struct crypto_alg *alg;
+ unsigned int size;
+
+ alg = crypto_alg_mod_lookup(name);
+ if (alg == NULL)
+ return 0;
+
+ size = crypto_alg_tfm_size(alg);
+
+ crypto_alg_put(alg);
+ /* hmm, there's a window to race between here and crypto_init_tfm */
+
+ return size;
+}
+
+int crypto_init_tfm(struct crypto_tfm *tfm, const char *name, u32 flags)
+{
+ struct crypto_alg *alg;
+ int ret = -EINVAL;
+
+ alg = crypto_alg_mod_lookup(name);
+ if (alg == NULL)
+ goto out;
+
+ ret = __crypto_init_tfm(tfm, alg, flags);
+ if (ret < 0)
+ goto out_put;
+
+ goto out;
+
+out_put:
+ crypto_alg_put(alg);
+out:
+ return ret;
+}
+
struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
{
struct crypto_tfm *tfm = NULL;
@@ -126,21 +202,12 @@
if (alg == NULL)
goto out;

- tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
+ tfm = kmalloc(crypto_alg_tfm_size(alg), GFP_KERNEL);
if (tfm == NULL)
goto out_put;

- memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
-
- tfm->__crt_alg = alg;
-
- if (crypto_init_flags(tfm, flags))
+ if (__crypto_init_tfm(tfm, alg, flags) < 0)
goto out_free_tfm;
-
- if (crypto_init_ops(tfm)) {
- crypto_exit_ops(tfm);
- goto out_free_tfm;
- }

goto out;

@@ -153,13 +220,52 @@
return tfm;
}

-void crypto_free_tfm(struct crypto_tfm *tfm)
+void crypto_exit_tfm(struct crypto_tfm *tfm)
{
crypto_exit_ops(tfm);
crypto_alg_put(tfm->__crt_alg);
+}
+
+void crypto_free_tfm(struct crypto_tfm *tfm)
+{
+ crypto_exit_tfm(tfm);
kfree(tfm);
}

+int crypto_copy_tfm(struct crypto_tfm *dst, struct crypto_tfm *src)
+{
+ int ret;
+
+ memcpy(dst, src, crypto_tfm_size(src));
+ crypto_alg_get(dst->__crt_alg);
+
+ ret = crypto_copy_ops(dst);
+ if (ret < 0)
+ crypto_alg_put(dst->__crt_alg);
+
+ return ret;
+}
+
+struct crypto_tfm *crypto_clone_tfm(struct crypto_tfm *orig)
+{
+ struct crypto_tfm *clone = NULL;
+
+ clone = kmalloc(crypto_tfm_size(orig), GFP_KERNEL);
+ if (clone == NULL)
+ goto out;
+
+ if (crypto_copy_tfm(clone, orig) < 0)
+ goto out_free_tfm;
+
+ goto out;
+
+out_free_tfm:
+ kfree(clone);
+ clone = NULL;
+out:
+ return clone;
+}
+
int crypto_register_alg(struct crypto_alg *alg)
{
int ret = 0;
diff -Nur linux.orig/crypto/cipher.c linux/crypto/cipher.c
--- linux.orig/crypto/cipher.c 2004-02-27 19:25:58.513315720 +0100
+++ linux/crypto/cipher.c 2004-02-27 19:26:44.457331168 +0100
@@ -281,7 +281,7 @@
}

ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);
- ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);
+ ops->cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);
if (ops->cit_iv == NULL)
ret = -ENOMEM;
}
@@ -290,6 +290,24 @@
return ret;
}

+int crypto_copy_cipher_ops(struct crypto_tfm *tfm)
+{
+ struct cipher_tfm *ops = &tfm->crt_cipher;
+
+ if (tfm->crt_cipher.cit_iv) {
+ void *new_cit_iv;
+
+ new_cit_iv = kmalloc(ops->cit_ivsize, GFP_KERNEL);
+ if (new_cit_iv == NULL)
+ return -ENOMEM;
+
+ memcpy(new_cit_iv, ops->cit_iv, ops->cit_ivsize);
+ ops->cit_iv = new_cit_iv;
+ }
+
+ return 0;
+}
+
void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
{
if (tfm->crt_cipher.cit_iv)
diff -Nur linux.orig/crypto/compress.c linux/crypto/compress.c
--- linux.orig/crypto/compress.c 2004-02-27 19:25:58.514315568 +0100
+++ linux/crypto/compress.c 2004-02-27 19:26:44.457331168 +0100
@@ -57,6 +57,11 @@
return ret;
}

+int crypto_copy_compress_ops(struct crypto_tfm *tfm)
+{
+ return tfm->__crt_alg->cra_compress.coa_copy(crypto_tfm_ctx(tfm));
+}
+
void crypto_exit_compress_ops(struct crypto_tfm *tfm)
{
tfm->__crt_alg->cra_compress.coa_exit(crypto_tfm_ctx(tfm));
diff -Nur linux.orig/crypto/deflate.c linux/crypto/deflate.c
--- linux.orig/crypto/deflate.c 2004-02-27 19:25:58.515315416 +0100
+++ linux/crypto/deflate.c 2004-02-27 19:26:44.458331016 +0100
@@ -55,6 +55,40 @@
return 0;
}

+static int deflate_copy(void *ctx)
+{
+ struct deflate_ctx *dctx = ctx;
+ struct z_stream_s *stream = &dctx->comp_stream;
+ unsigned int size;
+ void *new_workspace;
+
+ if (dctx->comp_initialized) {
+ new_workspace = __vmalloc(size = zlib_deflate_workspacesize(),
+ deflate_gfp()|__GFP_HIGHMEM,
+ PAGE_KERNEL);
+ if (!new_workspace)
+ return -ENOMEM;
+
+ memcpy(new_workspace, stream->workspace, size);
+ stream->workspace = new_workspace;
+ }
+ if (dctx->decomp_initialized) {
+ new_workspace = kmalloc(size = zlib_inflate_workspacesize(),
+ deflate_gfp());
+ if (!new_workspace) {
+ if (dctx->comp_initialized)
+ vfree(stream->workspace);
+
+ return -ENOMEM;
+ }
+
+ memcpy(new_workspace, stream->workspace, size);
+ stream->workspace = new_workspace;
+ }
+
+ return 0;
+}
+
static void deflate_exit(void *ctx)
{
struct deflate_ctx *dctx = ctx;
@@ -77,7 +111,7 @@
stream->workspace = __vmalloc(zlib_deflate_workspacesize(),
deflate_gfp()|__GFP_HIGHMEM,
PAGE_KERNEL);
- if (!stream->workspace ) {
+ if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
@@ -212,6 +246,7 @@
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = { .compress = {
.coa_init = deflate_init,
+ .coa_copy = deflate_copy,
.coa_exit = deflate_exit,
.coa_compress = deflate_compress,
.coa_decompress = deflate_decompress } }
diff -Nur linux.orig/crypto/digest.c linux/crypto/digest.c
--- linux.orig/crypto/digest.c 2004-02-27 19:25:58.517315112 +0100
+++ linux/crypto/digest.c 2004-02-27 19:26:44.459330864 +0100
@@ -76,6 +76,11 @@
return crypto_alloc_hmac_block(tfm);
}

+int crypto_copy_digest_ops(struct crypto_tfm *tfm)
+{
+ return crypto_clone_hmac_block(tfm);
+}
+
void crypto_exit_digest_ops(struct crypto_tfm *tfm)
{
crypto_free_hmac_block(tfm);
diff -Nur linux.orig/crypto/hmac.c linux/crypto/hmac.c
--- linux.orig/crypto/hmac.c 2004-02-27 19:25:58.517315112 +0100
+++ linux/crypto/hmac.c 2004-02-27 19:26:44.459330864 +0100
@@ -44,7 +44,24 @@
ret = -ENOMEM;

return ret;
-
+}
+
+int crypto_clone_hmac_block(struct crypto_tfm *tfm)
+{
+ void *new_hmac_block;
+ int ret = 0;
+
+ BUG_ON(!crypto_tfm_alg_blocksize(tfm));
+
+ new_hmac_block = kmalloc(crypto_tfm_alg_blocksize(tfm), GFP_KERNEL);
+ if (new_hmac_block != NULL) {
+ memcpy(new_hmac_block, tfm->crt_digest.dit_hmac_block,
+ crypto_tfm_alg_blocksize(tfm));
+ tfm->crt_digest.dit_hmac_block = new_hmac_block;
+ } else
+ ret = -ENOMEM;
+
+ return ret;
}

void crypto_free_hmac_block(struct crypto_tfm *tfm)
diff -Nur linux.orig/crypto/internal.h linux/crypto/internal.h
--- linux.orig/crypto/internal.h 2004-02-27 19:25:58.518314960 +0100
+++ linux/crypto/internal.h 2004-02-27 19:26:44.459330864 +0100
@@ -59,6 +59,7 @@

#ifdef CONFIG_CRYPTO_HMAC
int crypto_alloc_hmac_block(struct crypto_tfm *tfm);
+int crypto_copy_hmac_block(struct crypto_tfm *tfm);
void crypto_free_hmac_block(struct crypto_tfm *tfm);
#else
static inline int crypto_alloc_hmac_block(struct crypto_tfm *tfm)
@@ -85,6 +86,10 @@
int crypto_init_cipher_ops(struct crypto_tfm *tfm);
int crypto_init_compress_ops(struct crypto_tfm *tfm);

+int crypto_copy_digest_ops(struct crypto_tfm *tfm);
+int crypto_copy_cipher_ops(struct crypto_tfm *tfm);
+int crypto_copy_compress_ops(struct crypto_tfm *tfm);
+
void crypto_exit_digest_ops(struct crypto_tfm *tfm);
void crypto_exit_cipher_ops(struct crypto_tfm *tfm);
void crypto_exit_compress_ops(struct crypto_tfm *tfm);
diff -Nur linux.orig/include/linux/crypto.h linux/include/linux/crypto.h
--- linux.orig/include/linux/crypto.h 2004-02-27 19:25:51.934315880 +0100
+++ linux/include/linux/crypto.h 2004-02-27 19:26:32.639127808 +0100
@@ -80,6 +80,7 @@

struct compress_alg {
int (*coa_init)(void *ctx);
+ int (*coa_copy)(void *ctx);
void (*coa_exit)(void *ctx);
int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen);
@@ -191,7 +192,13 @@
/*
* Transform user interface.
*/
-
+
+#define crypto_alg_tfm_size(alg) (sizeof(struct crypto_tfm) + \
+ (alg)->cra_ctxsize)
+#define crypto_tfm_size(tfm) crypto_alg_tfm_size((tfm)->__crt_alg)
+
+unsigned int crypto_lookup_alg_tfm_size(const char *alg_name, u32 tfm_flags);
+
/*
* crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
* If that fails and the kernel supports dynamically loadable modules, it
@@ -200,10 +207,20 @@
*
* crypto_free_tfm() frees up the transform and any associated resources,
* then drops the refcount on the associated algorithm.
+ *
+ * crypto_init_tfm() and crypto_exit_tfm() do the same except that the user
+ * has to do the memory allocation.
*/
+int crypto_init_tfm(struct crypto_tfm *tfm, const char *alg_name,
+ u32 tfm_flags);
struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
+
+void crypto_exit_tfm(struct crypto_tfm *tfm);
void crypto_free_tfm(struct crypto_tfm *tfm);

+int crypto_copy_tfm(struct crypto_tfm *dst_tfm, struct crypto_tfm *src_tfm);
+struct crypto_tfm *crypto_clone_tfm(struct crypto_tfm *orig_tfm);
+
/*
* Transform helpers which query the underlying algorithm.
*/
-
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