Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (125 commits)
  [CRYPTO] twofish: Merge common glue code
  [CRYPTO] hifn_795x: Fixup container_of() usage
  [CRYPTO] cast6: inline bloat--
  [CRYPTO] api: Set default CRYPTO_MINALIGN to unsigned long long
  [CRYPTO] tcrypt: Make xcbc available as a standalone test
  [CRYPTO] xcbc: Remove bogus hash/cipher test
  [CRYPTO] xcbc: Fix algorithm leak when block size check fails
  [CRYPTO] tcrypt: Zero axbuf in the right function
  [CRYPTO] padlock: Only reset the key once for each CBC and ECB operation
  [CRYPTO] api: Include sched.h for cond_resched in scatterwalk.h
  [CRYPTO] salsa20-asm: Remove unnecessary dependency on CRYPTO_SALSA20
  [CRYPTO] tcrypt: Add select of AEAD
  [CRYPTO] salsa20: Add x86-64 assembly version
  [CRYPTO] salsa20_i586: Salsa20 stream cipher algorithm (i586 version)
  [CRYPTO] gcm: Introduce rfc4106
  [CRYPTO] api: Show async type
  [CRYPTO] chainiv: Avoid lock spinning where possible
  [CRYPTO] seqiv: Add select AEAD in Kconfig
  [CRYPTO] scatterwalk: Handle zero nbytes in scatterwalk_map_and_copy
  [CRYPTO] null: Allow setkey on digest_null 
  ...

1 files changed, 200 insertions, 27 deletions

diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index 5126696..46c97058 100644
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -6,6 +6,7 @@
  * s390 Version:
  *   Copyright IBM Corp. 2005,2007
  *   Author(s): Jan Glauber (jang@de.ibm.com)
+ *		Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
  *
  * Derived from "crypto/aes_generic.c"
  *
@@ -16,17 +17,13 @@
  *
  */
 
+#include <crypto/aes.h>
 #include <crypto/algapi.h>
+#include <linux/err.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include "crypt_s390.h"
 
-#define AES_MIN_KEY_SIZE	16
-#define AES_MAX_KEY_SIZE	32
-
-/* data block size for all key lengths */
-#define AES_BLOCK_SIZE		16
-
 #define AES_KEYLEN_128		1
 #define AES_KEYLEN_192		2
 #define AES_KEYLEN_256		4
@@ -39,45 +36,89 @@ struct s390_aes_ctx {
 	long enc;
 	long dec;
 	int key_len;
+	union {
+		struct crypto_blkcipher *blk;
+		struct crypto_cipher *cip;
+	} fallback;
 };
 
-static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
-		       unsigned int key_len)
+/*
+ * Check if the key_len is supported by the HW.
+ * Returns 0 if it is, a positive number if it is not and software fallback is
+ * required or a negative number in case the key size is not valid
+ */
+static int need_fallback(unsigned int key_len)
 {
-	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
-	u32 *flags = &tfm->crt_flags;
-
 	switch (key_len) {
 	case 16:
 		if (!(keylen_flag & AES_KEYLEN_128))
-			goto fail;
+			return 1;
 		break;
 	case 24:
 		if (!(keylen_flag & AES_KEYLEN_192))
-			goto fail;
-
+			return 1;
 		break;
 	case 32:
 		if (!(keylen_flag & AES_KEYLEN_256))
-			goto fail;
+			return 1;
 		break;
 	default:
-		goto fail;
+		return -1;
 		break;
 	}
+	return 0;
+}
+
+static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
+		unsigned int key_len)
+{
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+	int ret;
+
+	sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
+	sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
+			CRYPTO_TFM_REQ_MASK);
+
+	ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
+	if (ret) {
+		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+		tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
+				CRYPTO_TFM_RES_MASK);
+	}
+	return ret;
+}
+
+static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
+		       unsigned int key_len)
+{
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+	u32 *flags = &tfm->crt_flags;
+	int ret;
+
+	ret = need_fallback(key_len);
+	if (ret < 0) {
+		*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+		return -EINVAL;
+	}
 
 	sctx->key_len = key_len;
-	memcpy(sctx->key, in_key, key_len);
-	return 0;
-fail:
-	*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
-	return -EINVAL;
+	if (!ret) {
+		memcpy(sctx->key, in_key, key_len);
+		return 0;
+	}
+
+	return setkey_fallback_cip(tfm, in_key, key_len);
 }
 
 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
 	const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 
+	if (unlikely(need_fallback(sctx->key_len))) {
+		crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
+		return;
+	}
+
 	switch (sctx->key_len) {
 	case 16:
 		crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
@@ -98,6 +139,11 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
 	const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 
+	if (unlikely(need_fallback(sctx->key_len))) {
+		crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
+		return;
+	}
+
 	switch (sctx->key_len) {
 	case 16:
 		crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
@@ -114,6 +160,29 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 	}
 }
 
+static int fallback_init_cip(struct crypto_tfm *tfm)
+{
+	const char *name = tfm->__crt_alg->cra_name;
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+	sctx->fallback.cip = crypto_alloc_cipher(name, 0,
+			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+
+	if (IS_ERR(sctx->fallback.cip)) {
+		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
+		return PTR_ERR(sctx->fallback.blk);
+	}
+
+	return 0;
+}
+
+static void fallback_exit_cip(struct crypto_tfm *tfm)
+{
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_cipher(sctx->fallback.cip);
+	sctx->fallback.cip = NULL;
+}
 
 static struct crypto_alg aes_alg = {
 	.cra_name		=	"aes",
@@ -125,6 +194,8 @@ static struct crypto_alg aes_alg = {
 	.cra_ctxsize		=	sizeof(struct s390_aes_ctx),
 	.cra_module		=	THIS_MODULE,
 	.cra_list		=	LIST_HEAD_INIT(aes_alg.cra_list),
+	.cra_init               =       fallback_init_cip,
+	.cra_exit               =       fallback_exit_cip,
 	.cra_u			=	{
 		.cipher = {
 			.cia_min_keysize	=	AES_MIN_KEY_SIZE,
@@ -136,10 +207,70 @@ static struct crypto_alg aes_alg = {
 	}
 };
 
+static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
+		unsigned int len)
+{
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+	unsigned int ret;
+
+	sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
+	sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
+			CRYPTO_TFM_REQ_MASK);
+
+	ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
+	if (ret) {
+		tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+		tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
+				CRYPTO_TFM_RES_MASK);
+	}
+	return ret;
+}
+
+static int fallback_blk_dec(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	unsigned int ret;
+	struct crypto_blkcipher *tfm;
+	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
+
+	tfm = desc->tfm;
+	desc->tfm = sctx->fallback.blk;
+
+	ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
+
+	desc->tfm = tfm;
+	return ret;
+}
+
+static int fallback_blk_enc(struct blkcipher_desc *desc,
+		struct scatterlist *dst, struct scatterlist *src,
+		unsigned int nbytes)
+{
+	unsigned int ret;
+	struct crypto_blkcipher *tfm;
+	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
+
+	tfm = desc->tfm;
+	desc->tfm = sctx->fallback.blk;
+
+	ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
+
+	desc->tfm = tfm;
+	return ret;
+}
+
 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 			   unsigned int key_len)
 {
 	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+	int ret;
+
+	ret = need_fallback(key_len);
+	if (ret > 0) {
+		sctx->key_len = key_len;
+		return setkey_fallback_blk(tfm, in_key, key_len);
+	}
 
 	switch (key_len) {
 	case 16:
@@ -188,6 +319,9 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
 	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 	struct blkcipher_walk walk;
 
+	if (unlikely(need_fallback(sctx->key_len)))
+		return fallback_blk_enc(desc, dst, src, nbytes);
+
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
 }
@@ -199,10 +333,37 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
 	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 	struct blkcipher_walk walk;
 
+	if (unlikely(need_fallback(sctx->key_len)))
+		return fallback_blk_dec(desc, dst, src, nbytes);
+
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
 }
 
+static int fallback_init_blk(struct crypto_tfm *tfm)
+{
+	const char *name = tfm->__crt_alg->cra_name;
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+	sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
+			CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+
+	if (IS_ERR(sctx->fallback.blk)) {
+		printk(KERN_ERR "Error allocating fallback algo %s\n", name);
+		return PTR_ERR(sctx->fallback.blk);
+	}
+
+	return 0;
+}
+
+static void fallback_exit_blk(struct crypto_tfm *tfm)
+{
+	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_blkcipher(sctx->fallback.blk);
+	sctx->fallback.blk = NULL;
+}
+
 static struct crypto_alg ecb_aes_alg = {
 	.cra_name		=	"ecb(aes)",
 	.cra_driver_name	=	"ecb-aes-s390",
@@ -214,6 +375,8 @@ static struct crypto_alg ecb_aes_alg = {
 	.cra_type		=	&crypto_blkcipher_type,
 	.cra_module		=	THIS_MODULE,
 	.cra_list		=	LIST_HEAD_INIT(ecb_aes_alg.cra_list),
+	.cra_init		=	fallback_init_blk,
+	.cra_exit		=	fallback_exit_blk,
 	.cra_u			=	{
 		.blkcipher = {
 			.min_keysize		=	AES_MIN_KEY_SIZE,
@@ -229,6 +392,13 @@ static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 			   unsigned int key_len)
 {
 	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+	int ret;
+
+	ret = need_fallback(key_len);
+	if (ret > 0) {
+		sctx->key_len = key_len;
+		return setkey_fallback_blk(tfm, in_key, key_len);
+	}
 
 	switch (key_len) {
 	case 16:
@@ -283,6 +453,9 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
 	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 	struct blkcipher_walk walk;
 
+	if (unlikely(need_fallback(sctx->key_len)))
+		return fallback_blk_enc(desc, dst, src, nbytes);
+
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
 }
@@ -294,6 +467,9 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
 	struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
 	struct blkcipher_walk walk;
 
+	if (unlikely(need_fallback(sctx->key_len)))
+		return fallback_blk_dec(desc, dst, src, nbytes);
+
 	blkcipher_walk_init(&walk, dst, src, nbytes);
 	return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
 }
@@ -309,6 +485,8 @@ static struct crypto_alg cbc_aes_alg = {
 	.cra_type		=	&crypto_blkcipher_type,
 	.cra_module		=	THIS_MODULE,
 	.cra_list		=	LIST_HEAD_INIT(cbc_aes_alg.cra_list),
+	.cra_init		=	fallback_init_blk,
+	.cra_exit		=	fallback_exit_blk,
 	.cra_u			=	{
 		.blkcipher = {
 			.min_keysize		=	AES_MIN_KEY_SIZE,
@@ -336,14 +514,10 @@ static int __init aes_init(void)
 		return -EOPNOTSUPP;
 
 	/* z9 109 and z9 BC/EC only support 128 bit key length */
-	if (keylen_flag == AES_KEYLEN_128) {
-		aes_alg.cra_u.cipher.cia_max_keysize = AES_MIN_KEY_SIZE;
-		ecb_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE;
-		cbc_aes_alg.cra_u.blkcipher.max_keysize = AES_MIN_KEY_SIZE;
+	if (keylen_flag == AES_KEYLEN_128)
 		printk(KERN_INFO
 		       "aes_s390: hardware acceleration only available for"
 		       "128 bit keys\n");
-	}
 
 	ret = crypto_register_alg(&aes_alg);
 	if (ret)
@@ -382,4 +556,3 @@ MODULE_ALIAS("aes");
 
 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
 MODULE_LICENSE("GPL");
-