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path: root/drivers/crypto/vmx/aes_ctr.c
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Diffstat (limited to 'drivers/crypto/vmx/aes_ctr.c')
-rw-r--r--drivers/crypto/vmx/aes_ctr.c225
1 files changed, 117 insertions, 108 deletions
diff --git a/drivers/crypto/vmx/aes_ctr.c b/drivers/crypto/vmx/aes_ctr.c
index 96dbee4bf4a6..7adae42a7b79 100644
--- a/drivers/crypto/vmx/aes_ctr.c
+++ b/drivers/crypto/vmx/aes_ctr.c
@@ -30,138 +30,147 @@
#include "aesp8-ppc.h"
struct p8_aes_ctr_ctx {
- struct crypto_blkcipher *fallback;
- struct aes_key enc_key;
+ struct crypto_blkcipher *fallback;
+ struct aes_key enc_key;
};
static int p8_aes_ctr_init(struct crypto_tfm *tfm)
{
- const char *alg;
- struct crypto_blkcipher *fallback;
- struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
-
- if (!(alg = crypto_tfm_alg_name(tfm))) {
- printk(KERN_ERR "Failed to get algorithm name.\n");
- return -ENOENT;
- }
-
- fallback = crypto_alloc_blkcipher(alg, 0 ,CRYPTO_ALG_NEED_FALLBACK);
- if (IS_ERR(fallback)) {
- printk(KERN_ERR "Failed to allocate transformation for '%s': %ld\n",
- alg, PTR_ERR(fallback));
- return PTR_ERR(fallback);
- }
- printk(KERN_INFO "Using '%s' as fallback implementation.\n",
- crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));
-
- crypto_blkcipher_set_flags(fallback,
- crypto_blkcipher_get_flags((struct crypto_blkcipher *) tfm));
- ctx->fallback = fallback;
-
- return 0;
+ const char *alg;
+ struct crypto_blkcipher *fallback;
+ struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (!(alg = crypto_tfm_alg_name(tfm))) {
+ printk(KERN_ERR "Failed to get algorithm name.\n");
+ return -ENOENT;
+ }
+
+ fallback =
+ crypto_alloc_blkcipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(fallback)) {
+ printk(KERN_ERR
+ "Failed to allocate transformation for '%s': %ld\n",
+ alg, PTR_ERR(fallback));
+ return PTR_ERR(fallback);
+ }
+ printk(KERN_INFO "Using '%s' as fallback implementation.\n",
+ crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));
+
+ crypto_blkcipher_set_flags(
+ fallback,
+ crypto_blkcipher_get_flags((struct crypto_blkcipher *)tfm));
+ ctx->fallback = fallback;
+
+ return 0;
}
static void p8_aes_ctr_exit(struct crypto_tfm *tfm)
{
- struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
- if (ctx->fallback) {
- crypto_free_blkcipher(ctx->fallback);
- ctx->fallback = NULL;
- }
+ if (ctx->fallback) {
+ crypto_free_blkcipher(ctx->fallback);
+ ctx->fallback = NULL;
+ }
}
static int p8_aes_ctr_setkey(struct crypto_tfm *tfm, const u8 *key,
- unsigned int keylen)
+ unsigned int keylen)
{
- int ret;
- struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
+ int ret;
+ struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);
- pagefault_disable();
- enable_kernel_altivec();
- ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
- pagefault_enable();
+ pagefault_disable();
+ enable_kernel_altivec();
+ ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
+ pagefault_enable();
- ret += crypto_blkcipher_setkey(ctx->fallback, key, keylen);
- return ret;
+ ret += crypto_blkcipher_setkey(ctx->fallback, key, keylen);
+ return ret;
}
static void p8_aes_ctr_final(struct p8_aes_ctr_ctx *ctx,
- struct blkcipher_walk *walk)
+ struct blkcipher_walk *walk)
{
- u8 *ctrblk = walk->iv;
- u8 keystream[AES_BLOCK_SIZE];
- u8 *src = walk->src.virt.addr;
- u8 *dst = walk->dst.virt.addr;
- unsigned int nbytes = walk->nbytes;
-
- pagefault_disable();
- enable_kernel_altivec();
- aes_p8_encrypt(ctrblk, keystream, &ctx->enc_key);
- pagefault_enable();
-
- crypto_xor(keystream, src, nbytes);
- memcpy(dst, keystream, nbytes);
- crypto_inc(ctrblk, AES_BLOCK_SIZE);
+ u8 *ctrblk = walk->iv;
+ u8 keystream[AES_BLOCK_SIZE];
+ u8 *src = walk->src.virt.addr;
+ u8 *dst = walk->dst.virt.addr;
+ unsigned int nbytes = walk->nbytes;
+
+ pagefault_disable();
+ enable_kernel_altivec();
+ aes_p8_encrypt(ctrblk, keystream, &ctx->enc_key);
+ pagefault_enable();
+
+ crypto_xor(keystream, src, nbytes);
+ memcpy(dst, keystream, nbytes);
+ crypto_inc(ctrblk, AES_BLOCK_SIZE);
}
static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
- struct scatterlist *dst, struct scatterlist *src,
- unsigned int nbytes)
+ struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes)
{
- int ret;
- struct blkcipher_walk walk;
- struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(
- crypto_blkcipher_tfm(desc->tfm));
- struct blkcipher_desc fallback_desc = {
- .tfm = ctx->fallback,
- .info = desc->info,
- .flags = desc->flags
- };
-
- if (in_interrupt()) {
- ret = crypto_blkcipher_encrypt(&fallback_desc, dst, src, nbytes);
- } else {
- blkcipher_walk_init(&walk, dst, src, nbytes);
- ret = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
- while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
- pagefault_disable();
- enable_kernel_altivec();
- aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr, walk.dst.virt.addr,
- (nbytes & AES_BLOCK_MASK)/AES_BLOCK_SIZE, &ctx->enc_key, walk.iv);
- pagefault_enable();
-
- crypto_inc(walk.iv, AES_BLOCK_SIZE);
- nbytes &= AES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, &walk, nbytes);
- }
- if (walk.nbytes) {
- p8_aes_ctr_final(ctx, &walk);
- ret = blkcipher_walk_done(desc, &walk, 0);
- }
- }
-
- return ret;
+ int ret;
+ struct blkcipher_walk walk;
+ struct p8_aes_ctr_ctx *ctx =
+ crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));
+ struct blkcipher_desc fallback_desc = {
+ .tfm = ctx->fallback,
+ .info = desc->info,
+ .flags = desc->flags
+ };
+
+ if (in_interrupt()) {
+ ret = crypto_blkcipher_encrypt(&fallback_desc, dst, src,
+ nbytes);
+ } else {
+ blkcipher_walk_init(&walk, dst, src, nbytes);
+ ret = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
+ while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
+ pagefault_disable();
+ enable_kernel_altivec();
+ aes_p8_ctr32_encrypt_blocks(walk.src.virt.addr,
+ walk.dst.virt.addr,
+ (nbytes &
+ AES_BLOCK_MASK) /
+ AES_BLOCK_SIZE,
+ &ctx->enc_key,
+ walk.iv);
+ pagefault_enable();
+
+ crypto_inc(walk.iv, AES_BLOCK_SIZE);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ ret = blkcipher_walk_done(desc, &walk, nbytes);
+ }
+ if (walk.nbytes) {
+ p8_aes_ctr_final(ctx, &walk);
+ ret = blkcipher_walk_done(desc, &walk, 0);
+ }
+ }
+
+ return ret;
}
struct crypto_alg p8_aes_ctr_alg = {
- .cra_name = "ctr(aes)",
- .cra_driver_name = "p8_aes_ctr",
- .cra_module = THIS_MODULE,
- .cra_priority = 1000,
- .cra_type = &crypto_blkcipher_type,
- .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
- .cra_alignmask = 0,
- .cra_blocksize = 1,
- .cra_ctxsize = sizeof(struct p8_aes_ctr_ctx),
- .cra_init = p8_aes_ctr_init,
- .cra_exit = p8_aes_ctr_exit,
- .cra_blkcipher = {
- .ivsize = 0,
- .min_keysize = AES_MIN_KEY_SIZE,
- .max_keysize = AES_MAX_KEY_SIZE,
- .setkey = p8_aes_ctr_setkey,
- .encrypt = p8_aes_ctr_crypt,
- .decrypt = p8_aes_ctr_crypt,
- },
+ .cra_name = "ctr(aes)",
+ .cra_driver_name = "p8_aes_ctr",
+ .cra_module = THIS_MODULE,
+ .cra_priority = 1000,
+ .cra_type = &crypto_blkcipher_type,
+ .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_NEED_FALLBACK,
+ .cra_alignmask = 0,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct p8_aes_ctr_ctx),
+ .cra_init = p8_aes_ctr_init,
+ .cra_exit = p8_aes_ctr_exit,
+ .cra_blkcipher = {
+ .ivsize = 0,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .setkey = p8_aes_ctr_setkey,
+ .encrypt = p8_aes_ctr_crypt,
+ .decrypt = p8_aes_ctr_crypt,
+ },
};