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Subject[PATCH 1/2] PadLock processing multiple blocks at a time
# 
# Extends crypto/cipher.c for offloading the whole chaining modes
# to e.g. hardware crypto accelerators.
#
# Signed-off-by: Michal Ludvig <mludvig@suse.cz>
#

Index: linux-2.6.10/crypto/api.c
===================================================================
--- linux-2.6.10.orig/crypto/api.c 2004-12-24 22:35:39.000000000 +0100
+++ linux-2.6.10/crypto/api.c 2005-01-10 16:37:11.943356651 +0100
@@ -217,6 +217,19 @@ int crypto_alg_available(const char *nam
return ret;
}

+void *crypto_aligned_kmalloc(size_t size, int mode, size_t alignment, void **index)
+{
+ char *ptr;
+
+ ptr = kmalloc(size + alignment, mode);
+ *index = ptr;
+ if (alignment > 1 && ((long)ptr & (alignment - 1))) {
+ ptr += alignment - ((long)ptr & (alignment - 1));
+ }
+
+ return ptr;
+}
+
static int __init init_crypto(void)
{
printk(KERN_INFO "Initializing Cryptographic API\n");
@@ -231,3 +244,4 @@ EXPORT_SYMBOL_GPL(crypto_unregister_alg)
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
EXPORT_SYMBOL_GPL(crypto_free_tfm);
EXPORT_SYMBOL_GPL(crypto_alg_available);
+EXPORT_SYMBOL_GPL(crypto_aligned_kmalloc);
Index: linux-2.6.10/include/linux/crypto.h
===================================================================
--- linux-2.6.10.orig/include/linux/crypto.h 2005-01-07 17:26:42.000000000 +0100
+++ linux-2.6.10/include/linux/crypto.h 2005-01-10 16:37:52.157648454 +0100
@@ -42,6 +42,7 @@
#define CRYPTO_TFM_MODE_CBC 0x00000002
#define CRYPTO_TFM_MODE_CFB 0x00000004
#define CRYPTO_TFM_MODE_CTR 0x00000008
+#define CRYPTO_TFM_MODE_OFB 0x00000010

#define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
#define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
@@ -72,6 +73,18 @@ struct cipher_alg {
unsigned int keylen, u32 *flags);
void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
+ size_t cia_max_nbytes;
+ size_t cia_req_align;
+ void (*cia_ecb)(void *ctx, u8 *dst, const u8 *src, u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_cbc)(void *ctx, u8 *dst, const u8 *src, u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_cfb)(void *ctx, u8 *dst, const u8 *src, u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_ofb)(void *ctx, u8 *dst, const u8 *src, u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_ctr)(void *ctx, u8 *dst, const u8 *src, u8 *iv,
+ size_t nbytes, int encdec, int inplace);
};

struct digest_alg {
@@ -124,6 +137,11 @@ int crypto_unregister_alg(struct crypto_
int crypto_alg_available(const char *name, u32 flags);

/*
+ * Helper function.
+ */
+void *crypto_aligned_kmalloc (size_t size, int mode, size_t alignment, void **index);
+
+/*
* Transforms: user-instantiated objects which encapsulate algorithms
* and core processing logic. Managed via crypto_alloc_tfm() and
* crypto_free_tfm(), as well as the various helpers below.
@@ -258,6 +276,18 @@ static inline unsigned int crypto_tfm_al
return tfm->__crt_alg->cra_digest.dia_digestsize;
}

+static inline unsigned int crypto_tfm_alg_max_nbytes(struct crypto_tfm *tfm)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+ return tfm->__crt_alg->cra_cipher.cia_max_nbytes;
+}
+
+static inline unsigned int crypto_tfm_alg_req_align(struct crypto_tfm *tfm)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+ return tfm->__crt_alg->cra_cipher.cia_req_align;
+}
+
/*
* API wrappers.
*/
Index: linux-2.6.10/crypto/cipher.c
===================================================================
--- linux-2.6.10.orig/crypto/cipher.c 2004-12-24 22:34:57.000000000 +0100
+++ linux-2.6.10/crypto/cipher.c 2005-01-10 16:37:11.974350710 +0100
@@ -20,7 +20,31 @@
#include "internal.h"
#include "scatterwalk.h"

+#define CRA_CIPHER(tfm) (tfm)->__crt_alg->cra_cipher
+
+#define DEF_TFM_FUNCTION(name,mode,encdec,iv) \
+static int name(struct crypto_tfm *tfm, \
+ struct scatterlist *dst, \
+ struct scatterlist *src, \
+ unsigned int nbytes) \
+{ \
+ return crypt(tfm, dst, src, nbytes, \
+ mode, encdec, iv); \
+}
+
+#define DEF_TFM_FUNCTION_IV(name,mode,encdec,iv) \
+static int name(struct crypto_tfm *tfm, \
+ struct scatterlist *dst, \
+ struct scatterlist *src, \
+ unsigned int nbytes, u8 *iv) \
+{ \
+ return crypt(tfm, dst, src, nbytes, \
+ mode, encdec, iv); \
+}
+
typedef void (cryptfn_t)(void *, u8 *, const u8 *);
+typedef void (cryptblkfn_t)(void *, u8 *, const u8 *, u8 *,
+ size_t, int, int);
typedef void (procfn_t)(struct crypto_tfm *, u8 *,
u8*, cryptfn_t, int enc, void *, int);

@@ -38,6 +62,36 @@ static inline void xor_128(u8 *a, const
((u32 *)a)[3] ^= ((u32 *)b)[3];
}

+static void cbc_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+ cryptfn_t *fn, int enc, void *info, int in_place)
+{
+ u8 *iv = info;
+
+ /* Null encryption */
+ if (!iv)
+ return;
+
+ if (enc) {
+ tfm->crt_u.cipher.cit_xor_block(iv, src);
+ (*fn)(crypto_tfm_ctx(tfm), dst, iv);
+ memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
+ } else {
+ u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];
+ u8 *buf = in_place ? stack : dst;
+
+ (*fn)(crypto_tfm_ctx(tfm), buf, src);
+ tfm->crt_u.cipher.cit_xor_block(buf, iv);
+ memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
+ if (buf != dst)
+ memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));
+ }
+}
+
+static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+ cryptfn_t fn, int enc, void *info, int in_place)
+{
+ (*fn)(crypto_tfm_ctx(tfm), dst, src);
+}

/*
* Generic encrypt/decrypt wrapper for ciphers, handles operations across
@@ -47,22 +101,101 @@ static inline void xor_128(u8 *a, const
static int crypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
- unsigned int nbytes, cryptfn_t crfn,
- procfn_t prfn, int enc, void *info)
+ unsigned int nbytes,
+ int mode, int enc, void *info)
{
- struct scatter_walk walk_in, walk_out;
- const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
- u8 tmp_src[bsize];
- u8 tmp_dst[bsize];
+ cryptfn_t *cryptofn = NULL;
+ procfn_t *processfn = NULL;
+ cryptblkfn_t *cryptomultiblockfn = NULL;
+
+ struct scatter_walk walk_in, walk_out;
+ size_t max_nbytes = crypto_tfm_alg_max_nbytes(tfm);
+ size_t bsize = crypto_tfm_alg_blocksize(tfm);
+ int req_align = crypto_tfm_alg_req_align(tfm);
+ int ret = 0;
+ int gfp;
+ void *index_src = NULL, *index_dst = NULL;
+ u8 *iv = info;
+ u8 *tmp_src, *tmp_dst;

if (!nbytes)
- return 0;
+ return ret;

if (nbytes % bsize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}

+
+ switch (mode) {
+ case CRYPTO_TFM_MODE_ECB:
+ if (CRA_CIPHER(tfm).cia_ecb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ecb;
+ else {
+ cryptofn = (enc == CRYPTO_DIR_ENCRYPT) ?
+ CRA_CIPHER(tfm).cia_encrypt :
+ CRA_CIPHER(tfm).cia_decrypt;
+ processfn = ecb_process;
+ }
+ break;
+
+ case CRYPTO_TFM_MODE_CBC:
+ if (CRA_CIPHER(tfm).cia_cbc)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_cbc;
+ else {
+ cryptofn = (enc == CRYPTO_DIR_ENCRYPT) ?
+ CRA_CIPHER(tfm).cia_encrypt :
+ CRA_CIPHER(tfm).cia_decrypt;
+ processfn = cbc_process;
+ }
+ break;
+
+ /* Until we have the appropriate {ofb,cfb,ctr}_process()
+ functions, the following cases will return -ENOSYS if
+ there is no HW support for the mode. */
+ case CRYPTO_TFM_MODE_OFB:
+ if (CRA_CIPHER(tfm).cia_ofb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ofb;
+ else
+ return -ENOSYS;
+ break;
+
+ case CRYPTO_TFM_MODE_CFB:
+ if (CRA_CIPHER(tfm).cia_cfb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_cfb;
+ else
+ return -ENOSYS;
+ break;
+
+ case CRYPTO_TFM_MODE_CTR:
+ if (CRA_CIPHER(tfm).cia_ctr)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ctr;
+ else
+ return -ENOSYS;
+ break;
+
+ default:
+ BUG();
+ }
+
+ if (cryptomultiblockfn)
+ bsize = (max_nbytes > nbytes) ? nbytes : max_nbytes;
+
+ /* Some hardware crypto engines may require a specific
+ alignment of the buffers. We will align the buffers
+ already here to avoid their reallocating later. */
+ gfp = in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
+ tmp_src = crypto_aligned_kmalloc(bsize, gfp,
+ req_align, &index_src);
+ tmp_dst = crypto_aligned_kmalloc(bsize, gfp,
+ req_align, &index_dst);
+
+ if (!index_src || !index_dst) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
scatterwalk_start(&walk_in, src);
scatterwalk_start(&walk_out, dst);

@@ -81,7 +214,13 @@ static int crypt(struct crypto_tfm *tfm,

scatterwalk_copychunks(src_p, &walk_in, bsize, 0);

- prfn(tfm, dst_p, src_p, crfn, enc, info, in_place);
+ if (cryptomultiblockfn)
+ (*cryptomultiblockfn)(crypto_tfm_ctx(tfm),
+ dst_p, src_p, iv,
+ bsize, enc, in_place);
+ else
+ (*processfn)(tfm, dst_p, src_p, cryptofn,
+ enc, info, in_place);

scatterwalk_done(&walk_in, 0, nbytes);

@@ -89,46 +228,23 @@ static int crypt(struct crypto_tfm *tfm,
scatterwalk_done(&walk_out, 1, nbytes);

if (!nbytes)
- return 0;
+ goto out;

crypto_yield(tfm);
}
-}
-
-static void cbc_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
- cryptfn_t fn, int enc, void *info, int in_place)
-{
- u8 *iv = info;
-
- /* Null encryption */
- if (!iv)
- return;
-
- if (enc) {
- tfm->crt_u.cipher.cit_xor_block(iv, src);
- fn(crypto_tfm_ctx(tfm), dst, iv);
- memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
- } else {
- u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];
- u8 *buf = in_place ? stack : dst;

- fn(crypto_tfm_ctx(tfm), buf, src);
- tfm->crt_u.cipher.cit_xor_block(buf, iv);
- memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
- if (buf != dst)
- memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));
- }
-}
+out:
+ if (index_src)
+ kfree(index_src);
+ if (index_dst)
+ kfree(index_dst);

-static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
- cryptfn_t fn, int enc, void *info, int in_place)
-{
- fn(crypto_tfm_ctx(tfm), dst, src);
+ return ret;
}

static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
- struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
+ struct cipher_alg *cia = &CRA_CIPHER(tfm);

if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
@@ -138,80 +254,28 @@ static int setkey(struct crypto_tfm *tfm
&tfm->crt_flags);
}

-static int ecb_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- ecb_process, 1, NULL);
-}
+DEF_TFM_FUNCTION(ecb_encrypt, CRYPTO_TFM_MODE_ECB, CRYPTO_DIR_ENCRYPT, NULL);
+DEF_TFM_FUNCTION(ecb_decrypt, CRYPTO_TFM_MODE_ECB, CRYPTO_DIR_DECRYPT, NULL);

-static int ecb_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- ecb_process, 1, NULL);
-}
-
-static int cbc_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- cbc_process, 1, tfm->crt_cipher.cit_iv);
-}
-
-static int cbc_encrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- cbc_process, 1, iv);
-}
-
-static int cbc_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- cbc_process, 0, tfm->crt_cipher.cit_iv);
-}
-
-static int cbc_decrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- cbc_process, 0, iv);
-}
-
-static int nocrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return -ENOSYS;
-}
-
-static int nocrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return -ENOSYS;
-}
+DEF_TFM_FUNCTION(cbc_encrypt, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cbc_encrypt_iv, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(cbc_decrypt, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cbc_decrypt_iv, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(cfb_encrypt, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cfb_encrypt_iv, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(cfb_decrypt, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cfb_decrypt_iv, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(ofb_encrypt, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ofb_encrypt_iv, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(ofb_decrypt, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ofb_decrypt_iv, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(ctr_encrypt, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ctr_encrypt_iv, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(ctr_decrypt, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ctr_decrypt_iv, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_DECRYPT, iv);

int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)
{
@@ -245,17 +309,24 @@ int crypto_init_cipher_ops(struct crypto
break;

case CRYPTO_TFM_MODE_CFB:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
+ ops->cit_encrypt = cfb_encrypt;
+ ops->cit_decrypt = cfb_decrypt;
+ ops->cit_encrypt_iv = cfb_encrypt_iv;
+ ops->cit_decrypt_iv = cfb_decrypt_iv;
+ break;
+
+ case CRYPTO_TFM_MODE_OFB:
+ ops->cit_encrypt = ofb_encrypt;
+ ops->cit_decrypt = ofb_decrypt;
+ ops->cit_encrypt_iv = ofb_encrypt_iv;
+ ops->cit_decrypt_iv = ofb_decrypt_iv;
break;

case CRYPTO_TFM_MODE_CTR:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
+ ops->cit_encrypt = ctr_encrypt;
+ ops->cit_decrypt = ctr_decrypt;
+ ops->cit_encrypt_iv = ctr_encrypt_iv;
+ ops->cit_decrypt_iv = ctr_decrypt_iv;
break;

default:
-
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