diff options
Diffstat (limited to 'drivers/crypto/nx/nx-aes-cbc.c')
| -rw-r--r-- | drivers/crypto/nx/nx-aes-cbc.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-aes-cbc.c b/drivers/crypto/nx/nx-aes-cbc.c new file mode 100644 index 000000000..a066cc345 --- /dev/null +++ b/drivers/crypto/nx/nx-aes-cbc.c @@ -0,0 +1,150 @@ +/** + * AES CBC routines supporting the Power 7+ Nest Accelerators driver + * + * Copyright (C) 2011-2012 International Business Machines Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 only. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Author: Kent Yoder <yoder1@us.ibm.com> + */ + +#include <crypto/aes.h> +#include <crypto/algapi.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/crypto.h> +#include <asm/vio.h> + +#include "nx_csbcpb.h" +#include "nx.h" + + +static int cbc_aes_nx_set_key(struct crypto_tfm *tfm, + const u8 *in_key, + unsigned int key_len) +{ + struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm); + struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; + + nx_ctx_init(nx_ctx, HCOP_FC_AES); + + switch (key_len) { + case AES_KEYSIZE_128: + NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); + nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; + break; + case AES_KEYSIZE_192: + NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); + nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; + break; + case AES_KEYSIZE_256: + NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); + nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; + break; + default: + return -EINVAL; + } + + csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC; + memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len); + + return 0; +} + +static int cbc_aes_nx_crypt(struct blkcipher_desc *desc, + struct scatterlist *dst, + struct scatterlist *src, + unsigned int nbytes, + int enc) +{ + struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); + struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; + unsigned long irq_flags; + unsigned int processed = 0, to_process; + int rc; + + spin_lock_irqsave(&nx_ctx->lock, irq_flags); + + if (enc) + NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; + else + NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; + + do { + to_process = nbytes - processed; + + rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process, + processed, csbcpb->cpb.aes_cbc.iv); + if (rc) + goto out; + + if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { + rc = -EINVAL; + goto out; + } + + rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, + desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); + if (rc) + goto out; + + memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); + atomic_inc(&(nx_ctx->stats->aes_ops)); + atomic64_add(csbcpb->csb.processed_byte_count, + &(nx_ctx->stats->aes_bytes)); + + processed += to_process; + } while (processed < nbytes); +out: + spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); + return rc; +} + +static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc, + struct scatterlist *dst, + struct scatterlist *src, + unsigned int nbytes) +{ + return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1); +} + +static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc, + struct scatterlist *dst, + struct scatterlist *src, + unsigned int nbytes) +{ + return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0); +} + +struct crypto_alg nx_cbc_aes_alg = { + .cra_name = "cbc(aes)", + .cra_driver_name = "cbc-aes-nx", + .cra_priority = 300, + .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct nx_crypto_ctx), + .cra_type = &crypto_blkcipher_type, + .cra_alignmask = 0xf, + .cra_module = THIS_MODULE, + .cra_init = nx_crypto_ctx_aes_cbc_init, + .cra_exit = nx_crypto_ctx_exit, + .cra_blkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = cbc_aes_nx_set_key, + .encrypt = cbc_aes_nx_encrypt, + .decrypt = cbc_aes_nx_decrypt, + } +}; |