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[CRYPTO] padlock: Added block cipher versions of CBC/ECB
This patch adds block cipher algorithms for cbc(aes) and ecb(aes) for the PadLock device. Once all users to the old cipher type have been converted the old cbc/ecb PadLock operations will be removed. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
db131ef908
commit
28ce728a90
3 changed files with 169 additions and 7 deletions
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@ -27,6 +27,7 @@ config CRYPTO_DEV_PADLOCK
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config CRYPTO_DEV_PADLOCK_AES
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tristate "PadLock driver for AES algorithm"
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depends on CRYPTO_DEV_PADLOCK
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select CRYPTO_BLKCIPHER
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default m
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help
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Use VIA PadLock for AES algorithm.
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@ -43,11 +43,11 @@
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* ---------------------------------------------------------------------------
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*/
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#include <crypto/algapi.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/crypto.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/byteorder.h>
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@ -297,9 +297,9 @@ aes_hw_extkey_available(uint8_t key_len)
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return 0;
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}
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static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
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static inline struct aes_ctx *aes_ctx_common(void *ctx)
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{
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unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
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unsigned long addr = (unsigned long)ctx;
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unsigned long align = PADLOCK_ALIGNMENT;
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if (align <= crypto_tfm_ctx_alignment())
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@ -307,6 +307,16 @@ static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
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return (struct aes_ctx *)ALIGN(addr, align);
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}
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static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
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{
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return aes_ctx_common(crypto_tfm_ctx(tfm));
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}
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static inline struct aes_ctx *blk_aes_ctx(struct crypto_blkcipher *tfm)
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{
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return aes_ctx_common(crypto_blkcipher_ctx(tfm));
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}
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static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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@ -507,6 +517,141 @@ static struct crypto_alg aes_alg = {
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}
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};
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static int ecb_aes_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
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ctx->E, &ctx->cword.encrypt,
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nbytes / AES_BLOCK_SIZE);
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nbytes &= AES_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static int ecb_aes_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
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ctx->D, &ctx->cword.decrypt,
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nbytes / AES_BLOCK_SIZE);
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nbytes &= AES_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static struct crypto_alg ecb_aes_alg = {
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.cra_name = "ecb(aes)",
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.cra_driver_name = "ecb-aes-padlock",
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.cra_priority = PADLOCK_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct aes_ctx),
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.cra_alignmask = PADLOCK_ALIGNMENT - 1,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.setkey = aes_set_key,
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.encrypt = ecb_aes_encrypt,
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.decrypt = ecb_aes_decrypt,
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}
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}
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};
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static int cbc_aes_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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u8 *iv = padlock_xcrypt_cbc(walk.src.virt.addr,
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walk.dst.virt.addr, ctx->E,
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walk.iv, &ctx->cword.encrypt,
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nbytes / AES_BLOCK_SIZE);
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memcpy(walk.iv, iv, AES_BLOCK_SIZE);
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nbytes &= AES_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static int cbc_aes_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct aes_ctx *ctx = blk_aes_ctx(desc->tfm);
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struct blkcipher_walk walk;
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int err;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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while ((nbytes = walk.nbytes)) {
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padlock_xcrypt_cbc(walk.src.virt.addr, walk.dst.virt.addr,
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ctx->D, walk.iv, &ctx->cword.decrypt,
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nbytes / AES_BLOCK_SIZE);
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nbytes &= AES_BLOCK_SIZE - 1;
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err = blkcipher_walk_done(desc, &walk, nbytes);
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}
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return err;
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}
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static struct crypto_alg cbc_aes_alg = {
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.cra_name = "cbc(aes)",
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.cra_driver_name = "cbc-aes-padlock",
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.cra_priority = PADLOCK_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct aes_ctx),
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.cra_alignmask = PADLOCK_ALIGNMENT - 1,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.ivsize = AES_BLOCK_SIZE,
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.setkey = aes_set_key,
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.encrypt = cbc_aes_encrypt,
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.decrypt = cbc_aes_decrypt,
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}
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}
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};
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static int __init padlock_init(void)
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{
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int ret;
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@ -522,18 +667,33 @@ static int __init padlock_init(void)
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}
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gen_tabs();
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if ((ret = crypto_register_alg(&aes_alg))) {
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printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
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return ret;
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}
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if ((ret = crypto_register_alg(&aes_alg)))
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goto aes_err;
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if ((ret = crypto_register_alg(&ecb_aes_alg)))
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goto ecb_aes_err;
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if ((ret = crypto_register_alg(&cbc_aes_alg)))
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goto cbc_aes_err;
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printk(KERN_NOTICE PFX "Using VIA PadLock ACE for AES algorithm.\n");
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out:
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return ret;
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cbc_aes_err:
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crypto_unregister_alg(&ecb_aes_alg);
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ecb_aes_err:
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crypto_unregister_alg(&aes_alg);
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aes_err:
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printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
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goto out;
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}
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static void __exit padlock_fini(void)
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{
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crypto_unregister_alg(&cbc_aes_alg);
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crypto_unregister_alg(&ecb_aes_alg);
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crypto_unregister_alg(&aes_alg);
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}
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@ -18,5 +18,6 @@
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#define PFX "padlock: "
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#define PADLOCK_CRA_PRIORITY 300
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#define PADLOCK_COMPOSITE_PRIORITY 400
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#endif /* _CRYPTO_PADLOCK_H */
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