diff options
Diffstat (limited to 'drivers/crypto/nx/nx-aes-ctr.c')
| -rw-r--r-- | drivers/crypto/nx/nx-aes-ctr.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-aes-ctr.c b/drivers/crypto/nx/nx-aes-ctr.c new file mode 100644 index 000000000..02ad26012 --- /dev/null +++ b/drivers/crypto/nx/nx-aes-ctr.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-only +/** + * AES CTR routines supporting the Power 7+ Nest Accelerators driver + * + * Copyright (C) 2011-2012 International Business Machines Inc. + * + * Author: Kent Yoder <yoder1@us.ibm.com> + */ + +#include <crypto/aes.h> +#include <crypto/ctr.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 ctr_aes_nx_set_key(struct crypto_skcipher *tfm, + const u8 *in_key, + unsigned int key_len) +{ + struct nx_crypto_ctx *nx_ctx = crypto_skcipher_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_CTR; + memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len); + + return 0; +} + +static int ctr3686_aes_nx_set_key(struct crypto_skcipher *tfm, + const u8 *in_key, + unsigned int key_len) +{ + struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm); + + if (key_len < CTR_RFC3686_NONCE_SIZE) + return -EINVAL; + + memcpy(nx_ctx->priv.ctr.nonce, + in_key + key_len - CTR_RFC3686_NONCE_SIZE, + CTR_RFC3686_NONCE_SIZE); + + key_len -= CTR_RFC3686_NONCE_SIZE; + + return ctr_aes_nx_set_key(tfm, in_key, key_len); +} + +static int ctr_aes_nx_crypt(struct skcipher_request *req, u8 *iv) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(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); + + do { + to_process = req->cryptlen - processed; + + rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src, + &to_process, processed, + csbcpb->cpb.aes_ctr.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, + req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); + if (rc) + goto out; + + memcpy(iv, 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 < req->cryptlen); +out: + spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); + return rc; +} + +static int ctr3686_aes_nx_crypt(struct skcipher_request *req) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm); + u8 iv[16]; + + memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_NONCE_SIZE); + memcpy(iv + CTR_RFC3686_NONCE_SIZE, req->iv, CTR_RFC3686_IV_SIZE); + iv[12] = iv[13] = iv[14] = 0; + iv[15] = 1; + + return ctr_aes_nx_crypt(req, iv); +} + +struct skcipher_alg nx_ctr3686_aes_alg = { + .base.cra_name = "rfc3686(ctr(aes))", + .base.cra_driver_name = "rfc3686-ctr-aes-nx", + .base.cra_priority = 300, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct nx_crypto_ctx), + .base.cra_module = THIS_MODULE, + .init = nx_crypto_ctx_aes_ctr_init, + .exit = nx_crypto_ctx_skcipher_exit, + .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, + .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, + .ivsize = CTR_RFC3686_IV_SIZE, + .setkey = ctr3686_aes_nx_set_key, + .encrypt = ctr3686_aes_nx_crypt, + .decrypt = ctr3686_aes_nx_crypt, + .chunksize = AES_BLOCK_SIZE, +}; |