diff options
| -rw-r--r-- | drivers/crypto/geode-aes.c | 243 | ||||
| -rw-r--r-- | drivers/crypto/geode-aes.h | 6 |
2 files changed, 206 insertions, 43 deletions
diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c index 181d42c2deed..0ca92d414667 100644 --- a/drivers/crypto/geode-aes.c +++ b/drivers/crypto/geode-aes.c @@ -113,18 +113,103 @@ geode_aes_crypt(struct geode_aes_op *op) /* CRYPTO-API Functions */ -static int -geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len) +static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key, + unsigned int len) { struct geode_aes_op *op = crypto_tfm_ctx(tfm); + unsigned int ret; + + op->keylen = len; + + if (len == AES_KEYSIZE_128) { + memcpy(op->key, key, len); + return 0; + } - if (len != AES_KEY_LENGTH) { + if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) { + /* not supported at all */ tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; return -EINVAL; } - memcpy(op->key, key, len); - return 0; + /* + * The requested key size is not supported by HW, do a fallback + */ + op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; + op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK); + + ret = crypto_cipher_setkey(op->fallback.cip, key, len); + if (ret) { + tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; + tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK); + } + return ret; +} + +static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key, + unsigned int len) +{ + struct geode_aes_op *op = crypto_tfm_ctx(tfm); + unsigned int ret; + + op->keylen = len; + + if (len == AES_KEYSIZE_128) { + memcpy(op->key, key, len); + return 0; + } + + if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) { + /* not supported at all */ + tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; + return -EINVAL; + } + + /* + * The requested key size is not supported by HW, do a fallback + */ + op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; + op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK); + + ret = crypto_blkcipher_setkey(op->fallback.blk, key, len); + if (ret) { + tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; + tfm->crt_flags |= (op->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 geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); + + tfm = desc->tfm; + desc->tfm = op->fallback.blk; + + ret = crypto_blkcipher_decrypt(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 geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm); + + tfm = desc->tfm; + desc->tfm = op->fallback.blk; + + ret = crypto_blkcipher_encrypt(desc, dst, src, nbytes); + + desc->tfm = tfm; + return ret; } static void @@ -132,8 +217,10 @@ geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { struct geode_aes_op *op = crypto_tfm_ctx(tfm); - if ((out == NULL) || (in == NULL)) + if (unlikely(op->keylen != AES_KEYSIZE_128)) { + crypto_cipher_encrypt_one(op->fallback.cip, out, in); return; + } op->src = (void *) in; op->dst = (void *) out; @@ -151,8 +238,10 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { struct geode_aes_op *op = crypto_tfm_ctx(tfm); - if ((out == NULL) || (in == NULL)) + if (unlikely(op->keylen != AES_KEYSIZE_128)) { + crypto_cipher_decrypt_one(op->fallback.cip, out, in); return; + } op->src = (void *) in; op->dst = (void *) out; @@ -164,24 +253,50 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) geode_aes_crypt(op); } +static int fallback_init_cip(struct crypto_tfm *tfm) +{ + const char *name = tfm->__crt_alg->cra_name; + struct geode_aes_op *op = crypto_tfm_ctx(tfm); + + op->fallback.cip = crypto_alloc_cipher(name, 0, + CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); + + if (IS_ERR(op->fallback.cip)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(op->fallback.blk); + } + + return 0; +} + +static void fallback_exit_cip(struct crypto_tfm *tfm) +{ + struct geode_aes_op *op = crypto_tfm_ctx(tfm); + + crypto_free_cipher(op->fallback.cip); + op->fallback.cip = NULL; +} static struct crypto_alg geode_alg = { - .cra_name = "aes", - .cra_driver_name = "geode-aes-128", - .cra_priority = 300, - .cra_alignmask = 15, - .cra_flags = CRYPTO_ALG_TYPE_CIPHER, + .cra_name = "aes", + .cra_driver_name = "geode-aes", + .cra_priority = 300, + .cra_alignmask = 15, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER | + CRYPTO_ALG_NEED_FALLBACK, + .cra_init = fallback_init_cip, + .cra_exit = fallback_exit_cip, .cra_blocksize = AES_MIN_BLOCK_SIZE, .cra_ctxsize = sizeof(struct geode_aes_op), - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(geode_alg.cra_list), - .cra_u = { - .cipher = { - .cia_min_keysize = AES_KEY_LENGTH, - .cia_max_keysize = AES_KEY_LENGTH, - .cia_setkey = geode_setkey, - .cia_encrypt = geode_encrypt, - .cia_decrypt = geode_decrypt + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(geode_alg.cra_list), + .cra_u = { + .cipher = { + .cia_min_keysize = AES_MIN_KEY_SIZE, + .cia_max_keysize = AES_MAX_KEY_SIZE, + .cia_setkey = geode_setkey_cip, + .cia_encrypt = geode_encrypt, + .cia_decrypt = geode_decrypt } } }; @@ -195,6 +310,9 @@ geode_cbc_decrypt(struct blkcipher_desc *desc, struct blkcipher_walk walk; int err, ret; + if (unlikely(op->keylen != AES_KEYSIZE_128)) + return fallback_blk_dec(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); memcpy(op->iv, walk.iv, AES_IV_LENGTH); @@ -225,6 +343,9 @@ geode_cbc_encrypt(struct blkcipher_desc *desc, struct blkcipher_walk walk; int err, ret; + if (unlikely(op->keylen != AES_KEYSIZE_128)) + return fallback_blk_enc(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); memcpy(op->iv, walk.iv, AES_IV_LENGTH); @@ -245,22 +366,49 @@ geode_cbc_encrypt(struct blkcipher_desc *desc, return err; } +static int fallback_init_blk(struct crypto_tfm *tfm) +{ + const char *name = tfm->__crt_alg->cra_name; + struct geode_aes_op *op = crypto_tfm_ctx(tfm); + + op->fallback.blk = crypto_alloc_blkcipher(name, 0, + CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); + + if (IS_ERR(op->fallback.blk)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(op->fallback.blk); + } + + return 0; +} + +static void fallback_exit_blk(struct crypto_tfm *tfm) +{ + struct geode_aes_op *op = crypto_tfm_ctx(tfm); + + crypto_free_blkcipher(op->fallback.blk); + op->fallback.blk = NULL; +} + static struct crypto_alg geode_cbc_alg = { .cra_name = "cbc(aes)", - .cra_driver_name = "cbc-aes-geode-128", + .cra_driver_name = "cbc-aes-geode", .cra_priority = 400, - .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | + CRYPTO_ALG_NEED_FALLBACK, + .cra_init = fallback_init_blk, + .cra_exit = fallback_exit_blk, .cra_blocksize = AES_MIN_BLOCK_SIZE, .cra_ctxsize = sizeof(struct geode_aes_op), .cra_alignmask = 15, - .cra_type = &crypto_blkcipher_type, - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list), - .cra_u = { - .blkcipher = { - .min_keysize = AES_KEY_LENGTH, - .max_keysize = AES_KEY_LENGTH, - .setkey = geode_setkey, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .setkey = geode_setkey_blk, .encrypt = geode_cbc_encrypt, .decrypt = geode_cbc_decrypt, .ivsize = AES_IV_LENGTH, @@ -277,6 +425,9 @@ geode_ecb_decrypt(struct blkcipher_desc *desc, struct blkcipher_walk walk; int err, ret; + if (unlikely(op->keylen != AES_KEYSIZE_128)) + return fallback_blk_dec(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); @@ -304,6 +455,9 @@ geode_ecb_encrypt(struct blkcipher_desc *desc, struct blkcipher_walk walk; int err, ret; + if (unlikely(op->keylen != AES_KEYSIZE_128)) + return fallback_blk_enc(desc, dst, src, nbytes); + blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt(desc, &walk); @@ -323,21 +477,24 @@ geode_ecb_encrypt(struct blkcipher_desc *desc, } static struct crypto_alg geode_ecb_alg = { - .cra_name = "ecb(aes)", - .cra_driver_name = "ecb-aes-geode-128", + .cra_name = "ecb(aes)", + .cra_driver_name = "ecb-aes-geode", .cra_priority = 400, - .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | + CRYPTO_ALG_NEED_FALLBACK, + .cra_init = fallback_init_blk, + .cra_exit = fallback_exit_blk, .cra_blocksize = AES_MIN_BLOCK_SIZE, .cra_ctxsize = sizeof(struct geode_aes_op), .cra_alignmask = 15, - .cra_type = &crypto_blkcipher_type, - .cra_module = THIS_MODULE, - .cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list), - .cra_u = { - .blkcipher = { - .min_keysize = AES_KEY_LENGTH, - .max_keysize = AES_KEY_LENGTH, - .setkey = geode_setkey, + .cra_type = &crypto_blkcipher_type, + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list), + .cra_u = { + .blkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .setkey = geode_setkey_blk, .encrypt = geode_ecb_encrypt, .decrypt = geode_ecb_decrypt, } @@ -367,7 +524,7 @@ geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id) if ((ret = pci_enable_device(dev))) return ret; - if ((ret = pci_request_regions(dev, "geode-aes-128"))) + if ((ret = pci_request_regions(dev, "geode-aes"))) goto eenable; _iobase = pci_iomap(dev, 0, 0); diff --git a/drivers/crypto/geode-aes.h b/drivers/crypto/geode-aes.h index 2f1d55982aac..14cc763da1e4 100644 --- a/drivers/crypto/geode-aes.h +++ b/drivers/crypto/geode-aes.h @@ -66,6 +66,12 @@ struct geode_aes_op { u8 key[AES_KEY_LENGTH]; u8 iv[AES_IV_LENGTH]; + + union { + struct crypto_blkcipher *blk; + struct crypto_cipher *cip; + } fallback; + u32 keylen; }; #endif |