A version 5 device provides the primitive commands
required for AES GCM. This patch adds support for
en/decryption.
Signed-off-by: Gary R Hook <gary.h...@amd.com>
---
drivers/crypto/ccp/Makefile | 1
drivers/crypto/ccp/ccp-crypto-aes-galois.c | 257 ++++++++++++++++++++++++++++
drivers/crypto/ccp/ccp-crypto-main.c | 12 +
drivers/crypto/ccp/ccp-crypto.h | 14 ++
drivers/crypto/ccp/ccp-dev-v5.c | 2
drivers/crypto/ccp/ccp-dev.h | 1
drivers/crypto/ccp/ccp-ops.c | 252 +++++++++++++++++++++++++++
include/linux/ccp.h | 9 +
8 files changed, 548 insertions(+)
create mode 100644 drivers/crypto/ccp/ccp-crypto-aes-galois.c
diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index 346ceb8..9ca1722 100644
--- a/drivers/crypto/ccp/Makefile
+++ b/drivers/crypto/ccp/Makefile
@@ -12,4 +12,5 @@ ccp-crypto-objs := ccp-crypto-main.o \
ccp-crypto-aes.o \
ccp-crypto-aes-cmac.o \
ccp-crypto-aes-xts.o \
+ ccp-crypto-aes-galois.o \
ccp-crypto-sha.o
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-galois.c
b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
new file mode 100644
index 0000000..8bc18c9
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-aes-galois.c
@@ -0,0 +1,257 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <gary.h...@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/internal/aead.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/ctr.h>
+#include <crypto/scatterwalk.h>
+#include <linux/delay.h>
+
+#include "ccp-crypto.h"
+
+#define AES_GCM_IVSIZE 12
+
+static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int
ret)
+{
+ return ret;
+}
+
+static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+
+ switch (key_len) {
+ case AES_KEYSIZE_128:
+ ctx->u.aes.type = CCP_AES_TYPE_128;
+ break;
+ case AES_KEYSIZE_192:
+ ctx->u.aes.type = CCP_AES_TYPE_192;
+ break;
+ case AES_KEYSIZE_256:
+ ctx->u.aes.type = CCP_AES_TYPE_256;
+ break;
+ default:
+ crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ ctx->u.aes.mode = CCP_AES_MODE_GCM;
+ ctx->u.aes.key_len = key_len;
+
+ memcpy(ctx->u.aes.key, key, key_len);
+ sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
+
+ return 0;
+}
+
+static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ return 0;
+}
+
+static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+ struct ccp_aes_req_ctx *rctx = aead_request_ctx(req);
+ struct scatterlist *iv_sg = NULL;
+ unsigned int iv_len = 0;
+ int i;
+ int ret = 0;
+
+ if (!ctx->u.aes.key_len)
+ return -EINVAL;
+
+ if (ctx->u.aes.mode != CCP_AES_MODE_GCM)
+ return -EINVAL;
+
+ if (!req->iv)
+ return -EINVAL;
+
+ /*
+ * 5 parts:
+ * plaintext/ciphertext input
+ * AAD
+ * key
+ * IV
+ * Destination+tag buffer
+ */
+
+ /* According to the way AES GCM has been implemented here,
+ * per RFC 4106 it seems, the provided IV is fixed at 12 bytes,
+ * occupies the beginning of the IV array. Write a 32-bit
+ * integer after that (bytes 13-16) with a value of "1".
+ */
+ memcpy(rctx->iv, req->iv, AES_GCM_IVSIZE);
+ for (i = 0; i < 3; i++)
+ rctx->iv[i + AES_GCM_IVSIZE] = 0;
+ rctx->iv[AES_BLOCK_SIZE - 1] = 1;
+
+ /* Set up a scatterlist for the IV */
+ iv_sg = &rctx->iv_sg;
+ iv_len = AES_BLOCK_SIZE;
+ sg_init_one(iv_sg, rctx->iv, iv_len);
+
+ /* The AAD + plaintext are concatenated in the src buffer */
+ memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+ INIT_LIST_HEAD(&rctx->cmd.entry);
+ rctx->cmd.engine = CCP_ENGINE_AES;
+ rctx->cmd.u.aes.type = ctx->u.aes.type;
+ rctx->cmd.u.aes.mode = ctx->u.aes.mode;
+ rctx->cmd.u.aes.action =
+ (encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
+ rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
+ rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
+ rctx->cmd.u.aes.iv = iv_sg;
+ rctx->cmd.u.aes.iv_len = iv_len;
+ rctx->cmd.u.aes.src = req->src;
+ rctx->cmd.u.aes.src_len = req->cryptlen;
+ rctx->cmd.u.aes.aad_len = req->assoclen;
+
+ /* The cipher text + the tag are in the dst buffer */
+ rctx->cmd.u.aes.dst = req->dst;
+
+ ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+ return ret;
+}
+
+static int ccp_aes_gcm_encrypt(struct aead_request *req)
+{
+ return ccp_aes_gcm_crypt(req, true);
+}
+
+static int ccp_aes_gcm_decrypt(struct aead_request *req)
+{
+ return ccp_aes_gcm_crypt(req, false);
+}
+
+static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm)
+{
+ struct ccp_ctx *ctx = crypto_aead_ctx(tfm);
+
+ ctx->complete = ccp_aes_gcm_complete;
+ ctx->u.aes.key_len = 0;
+
+ crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
+
+ return 0;
+}
+
+static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static struct aead_alg ccp_aes_gcm_defaults = {
+ .setkey = ccp_aes_gcm_setkey,
+ .setauthsize = ccp_aes_gcm_setauthsize,
+ .encrypt = ccp_aes_gcm_encrypt,
+ .decrypt = ccp_aes_gcm_decrypt,
+ .init = ccp_aes_gcm_cra_init,
+ .ivsize = AES_GCM_IVSIZE,
+ .maxauthsize = AES_BLOCK_SIZE,
+ .base = {
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct ccp_ctx),
+ .cra_priority = CCP_CRA_PRIORITY,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_exit = ccp_aes_gcm_cra_exit,
+ .cra_module = THIS_MODULE,
+ },
+};
+
+struct ccp_aes_aead_def {
+ enum ccp_aes_mode mode;
+ unsigned int version;
+ const char *name;
+ const char *driver_name;
+ unsigned int blocksize;
+ unsigned int ivsize;
+ struct aead_alg *alg_defaults;
+};
+
+static struct ccp_aes_aead_def aes_aead_algs[] = {
+ {
+ .mode = CCP_AES_MODE_GHASH,
+ .version = CCP_VERSION(5, 0),
+ .name = "gcm(aes)",
+ .driver_name = "gcm-aes-ccp",
+ .blocksize = 1,
+ .ivsize = AES_BLOCK_SIZE,
+ .alg_defaults = &ccp_aes_gcm_defaults,
+ },
+};
+
+static int ccp_register_aes_aead(struct list_head *head,
+ const struct ccp_aes_aead_def *def)
+{
+ struct ccp_crypto_aead *ccp_aead;
+ struct aead_alg *alg;
+ int ret;
+
+ ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL);
+ if (!ccp_aead)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ccp_aead->entry);
+
+ ccp_aead->mode = def->mode;
+
+ /* Copy the defaults and override as necessary */
+ alg = &ccp_aead->alg;
+ *alg = *def->alg_defaults;
+ snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+ snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ def->driver_name);
+ alg->base.cra_blocksize = def->blocksize;
+ alg->base.cra_ablkcipher.ivsize = def->ivsize;
+
+ ret = crypto_register_aead(alg);
+ if (ret) {
+ pr_err("%s ablkcipher algorithm registration error (%d)\n",
+ alg->base.cra_name, ret);
+ kfree(ccp_aead);
+ return ret;
+ }
+
+ list_add(&ccp_aead->entry, head);
+
+ return 0;
+}
+
+int ccp_register_aes_aeads(struct list_head *head)
+{
+ int i, ret;
+ unsigned int ccpversion = ccp_version();
+
+ for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) {
+ if (aes_aead_algs[i].version > ccpversion)
+ continue;
+ ret = ccp_register_aes_aead(head, &aes_aead_algs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
diff --git a/drivers/crypto/ccp/ccp-crypto-main.c
b/drivers/crypto/ccp/ccp-crypto-main.c
index e0380e5..a33b8d6 100644
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -36,6 +36,7 @@
/* List heads for the supported algorithms */
static LIST_HEAD(hash_algs);
static LIST_HEAD(cipher_algs);
+static LIST_HEAD(aead_algs);
/* For any tfm, requests for that tfm must be returned on the order
* received. With multiple queues available, the CCP can process more
@@ -335,6 +336,10 @@ static int ccp_register_algs(void)
ret = ccp_register_aes_xts_algs(&cipher_algs);
if (ret)
return ret;
+
+ ret = ccp_register_aes_aeads(&aead_algs);
+ if (ret)
+ return ret;
}
if (!sha_disable) {
@@ -350,6 +355,7 @@ static void ccp_unregister_algs(void)
{
struct ccp_crypto_ahash_alg *ahash_alg, *ahash_tmp;
struct ccp_crypto_ablkcipher_alg *ablk_alg, *ablk_tmp;
+ struct ccp_crypto_aead *aead_alg, *aead_tmp;
list_for_each_entry_safe(ahash_alg, ahash_tmp, &hash_algs, entry) {
crypto_unregister_ahash(&ahash_alg->alg);
@@ -362,6 +368,12 @@ static void ccp_unregister_algs(void)
list_del(&ablk_alg->entry);
kfree(ablk_alg);
}
+
+ list_for_each_entry_safe(aead_alg, aead_tmp, &aead_algs, entry) {
+ crypto_unregister_aead(&aead_alg->alg);
+ list_del(&aead_alg->entry);
+ kfree(aead_alg);
+ }
}
static int ccp_crypto_init(void)
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index 95cce27..34da62d 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -19,6 +19,8 @@
#include <linux/ccp.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
+#include <crypto/internal/aead.h>
+#include <crypto/aead.h>
#include <crypto/ctr.h>
#include <crypto/hash.h>
#include <crypto/sha.h>
@@ -33,6 +35,14 @@ struct ccp_crypto_ablkcipher_alg {
struct crypto_alg alg;
};
+struct ccp_crypto_aead {
+ struct list_head entry;
+
+ u32 mode;
+
+ struct aead_alg alg;
+};
+
struct ccp_crypto_ahash_alg {
struct list_head entry;
@@ -95,6 +105,9 @@ struct ccp_aes_req_ctx {
struct scatterlist iv_sg;
u8 iv[AES_BLOCK_SIZE];
+ struct scatterlist tag_sg;
+ u8 tag[AES_BLOCK_SIZE];
+
/* Fields used for RFC3686 requests */
u8 *rfc3686_info;
u8 rfc3686_iv[AES_BLOCK_SIZE];
@@ -212,6 +225,7 @@ struct scatterlist *ccp_crypto_sg_table_add(struct sg_table
*table,
int ccp_register_aes_algs(struct list_head *head);
int ccp_register_aes_cmac_algs(struct list_head *head);
int ccp_register_aes_xts_algs(struct list_head *head);
+int ccp_register_aes_aeads(struct list_head *head);
int ccp_register_sha_algs(struct list_head *head);
#endif
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index d9e1876..d44a738 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -289,6 +289,8 @@ static int ccp5_perform_aes(struct ccp_op *op)
CCP_AES_TYPE(&function) = op->u.aes.type;
if (op->u.aes.mode == CCP_AES_MODE_CFB)
CCP_AES_SIZE(&function) = 0x7f;
+ if ((op->u.aes.mode == CCP_AES_MODE_GCTR) && op->eom)
+ CCP_AES_SIZE(&function) = op->u.aes.size;
CCP5_CMD_FUNCTION(&desc) = function.raw;
diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h
index 830f35e..8f313e6 100644
--- a/drivers/crypto/ccp/ccp-dev.h
+++ b/drivers/crypto/ccp/ccp-dev.h
@@ -466,6 +466,7 @@ struct ccp_aes_op {
enum ccp_aes_type type;
enum ccp_aes_mode mode;
enum ccp_aes_action action;
+ unsigned int size;
};
struct ccp_xts_aes_op {
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 213a752..83c8cf7 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -600,6 +600,255 @@ static int ccp_run_aes_cmac_cmd(struct ccp_cmd_queue
*cmd_q,
return ret;
}
+static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
+ struct ccp_cmd *cmd)
+{
+ struct ccp_aes_engine *aes = &cmd->u.aes;
+ struct ccp_dm_workarea key, ctx, final_wa, tag;
+ struct ccp_data src, dst;
+ struct ccp_data aad;
+ struct ccp_op op;
+
+ unsigned long long *final;
+ unsigned int dm_offset;
+ unsigned int ilen;
+ bool in_place = true; /* Default value */
+ int ret;
+
+ struct scatterlist *p_inp, sg_inp[2];
+ struct scatterlist *p_tag, sg_tag[2];
+ struct scatterlist *p_outp, sg_outp[2];
+ struct scatterlist *p_aad;
+
+ if (!aes->iv)
+ return -EINVAL;
+
+ if (!((aes->key_len == AES_KEYSIZE_128) ||
+ (aes->key_len == AES_KEYSIZE_192) ||
+ (aes->key_len == AES_KEYSIZE_256)))
+ return -EINVAL;
+
+ if (!aes->key) /* Gotta have a key SGL */
+ return -EINVAL;
+
+ /* First, decompose the source buffer into AAD & PT,
+ * and the destination buffer into AAD, CT & tag, or
+ * the input into CT & tag.
+ * It is expected that the input and output SGs will
+ * be valid, even if the AAD and input lengths are 0.
+ */
+ p_aad = aes->src;
+ p_inp = scatterwalk_ffwd(sg_inp, aes->src, aes->aad_len);
+ p_outp = scatterwalk_ffwd(sg_outp, aes->dst, aes->aad_len);
+ if (aes->action == CCP_AES_ACTION_ENCRYPT) {
+ ilen = aes->src_len;
+ p_tag = scatterwalk_ffwd(sg_tag, p_outp, ilen);
+ } else {
+ /* Input length for decryption includes tag */
+ ilen = aes->src_len - AES_BLOCK_SIZE;
+ p_tag = scatterwalk_ffwd(sg_tag, p_inp, ilen);
+ }
+
+ memset(&op, 0, sizeof(op));
+ op.cmd_q = cmd_q;
+ op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
+ op.sb_key = cmd_q->sb_key; /* Pre-allocated */
+ op.sb_ctx = cmd_q->sb_ctx; /* Pre-allocated */
+ op.init = 1;
+ op.u.aes.type = aes->type;
+
+ /* Copy the key to the LSB */
+ ret = ccp_init_dm_workarea(&key, cmd_q,
+ CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES,
+ DMA_TO_DEVICE);
+ if (ret)
+ return ret;
+
+ dm_offset = CCP_SB_BYTES - aes->key_len;
+ ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
+ ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
+ CCP_PASSTHRU_BYTESWAP_256BIT);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_key;
+ }
+
+ /* Copy the context (IV) to the LSB.
+ * There is an assumption here that the IV is 96 bits in length, plus
+ * a nonce of 32 bits. If no IV is present, use a zeroed buffer.
+ */
+ ret = ccp_init_dm_workarea(&ctx, cmd_q,
+ CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES,
+ DMA_BIDIRECTIONAL);
+ if (ret)
+ goto e_key;
+
+ dm_offset = CCP_AES_CTX_SB_COUNT * CCP_SB_BYTES - aes->iv_len;
+ ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
+
+ ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+ CCP_PASSTHRU_BYTESWAP_256BIT);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_ctx;
+ }
+
+ op.init = 1;
+ if (aes->aad_len > 0) {
+ /* Step 1: Run a GHASH over the Additional Authenticated Data */
+ ret = ccp_init_data(&aad, cmd_q, p_aad, aes->aad_len,
+ AES_BLOCK_SIZE,
+ DMA_TO_DEVICE);
+ if (ret)
+ goto e_ctx;
+
+ op.u.aes.mode = CCP_AES_MODE_GHASH;
+ op.u.aes.action = CCP_AES_GHASHAAD;
+
+ while (aad.sg_wa.bytes_left) {
+ ccp_prepare_data(&aad, NULL, &op, AES_BLOCK_SIZE, true);
+
+ ret = cmd_q->ccp->vdata->perform->aes(&op);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_aad;
+ }
+
+ ccp_process_data(&aad, NULL, &op);
+ op.init = 0;
+ }
+ }
+
+ op.u.aes.mode = CCP_AES_MODE_GCTR;
+ op.u.aes.action = aes->action;
+
+ if (ilen > 0) {
+ /* Step 2: Run a GCTR over the plaintext */
+ in_place = (sg_virt(p_inp) == sg_virt(p_outp)) ? true : false;
+
+ ret = ccp_init_data(&src, cmd_q, p_inp, ilen,
+ AES_BLOCK_SIZE,
+ in_place ? DMA_BIDIRECTIONAL
+ : DMA_TO_DEVICE);
+ if (ret)
+ goto e_ctx;
+
+ if (in_place) {
+ dst = src;
+ } else {
+ ret = ccp_init_data(&dst, cmd_q, p_outp, ilen,
+ AES_BLOCK_SIZE, DMA_FROM_DEVICE);
+ if (ret)
+ goto e_src;
+ }
+
+ op.soc = 0;
+ op.eom = 0;
+ op.init = 1;
+ while (src.sg_wa.bytes_left) {
+ ccp_prepare_data(&src, &dst, &op, AES_BLOCK_SIZE, true);
+ if (!src.sg_wa.bytes_left) {
+ unsigned int nbytes = aes->src_len
+ % AES_BLOCK_SIZE;
+
+ if (nbytes) {
+ op.eom = 1;
+ op.u.aes.size = (nbytes * 8) - 1;
+ }
+ }
+
+ ret = cmd_q->ccp->vdata->perform->aes(&op);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_dst;
+ }
+
+ ccp_process_data(&src, &dst, &op);
+ op.init = 0;
+ }
+ }
+
+ /* Step 3: Update the IV portion of the context with the original IV */
+ ret = ccp_copy_from_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+ CCP_PASSTHRU_BYTESWAP_256BIT);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_dst;
+ }
+
+ ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
+
+ ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx,
+ CCP_PASSTHRU_BYTESWAP_256BIT);
+ if (ret) {
+ cmd->engine_error = cmd_q->cmd_error;
+ goto e_dst;
+ }
+
+ /* Step 4: Concatenate the lengths of the AAD and source, and
+ * hash that 16 byte buffer.
+ */
+ ret = ccp_init_dm_workarea(&final_wa, cmd_q, AES_BLOCK_SIZE,
+ DMA_BIDIRECTIONAL);
+ if (ret)
+ goto e_dst;
+ final = (unsigned long long *) final_wa.address;
+ final[0] = cpu_to_be64(aes->aad_len * 8);
+ final[1] = cpu_to_be64(ilen * 8);
+
+ op.u.aes.mode = CCP_AES_MODE_GHASH;
+ op.u.aes.action = CCP_AES_GHASHFINAL;
+ op.src.type = CCP_MEMTYPE_SYSTEM;
+ op.src.u.dma.address = final_wa.dma.address;
+ op.src.u.dma.length = AES_BLOCK_SIZE;
+ op.dst.type = CCP_MEMTYPE_SYSTEM;
+ op.dst.u.dma.address = final_wa.dma.address;
+ op.dst.u.dma.length = AES_BLOCK_SIZE;
+ op.eom = 1;
+ op.u.aes.size = 0;
+ ret = cmd_q->ccp->vdata->perform->aes(&op);
+ if (ret)
+ goto e_dst;
+
+ if (aes->action == CCP_AES_ACTION_ENCRYPT) {
+ /* Put the ciphered tag after the ciphertext. */
+ ccp_get_dm_area(&final_wa, 0, p_tag, 0, AES_BLOCK_SIZE);
+ } else {
+ /* Does this ciphered tag match the input? */
+ ret = ccp_init_dm_workarea(&tag, cmd_q, AES_BLOCK_SIZE,
+ DMA_BIDIRECTIONAL);
+ if (ret)
+ goto e_tag;
+ ccp_set_dm_area(&tag, 0, p_tag, 0, AES_BLOCK_SIZE);
+
+ ret = memcmp(tag.address, final_wa.address, AES_BLOCK_SIZE);
+ ccp_dm_free(&tag);
+ }
+
+e_tag:
+ ccp_dm_free(&final_wa);
+
+e_dst:
+ if (aes->src_len && !in_place)
+ ccp_free_data(&dst, cmd_q);
+
+e_src:
+ if (aes->src_len)
+ ccp_free_data(&src, cmd_q);
+
+e_aad:
+ if (aes->aad_len)
+ ccp_free_data(&aad, cmd_q);
+
+e_ctx:
+ ccp_dm_free(&ctx);
+
+e_key:
+ ccp_dm_free(&key);
+
+ return ret;
+}
+
static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
struct ccp_aes_engine *aes = &cmd->u.aes;
@@ -613,6 +862,9 @@ static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q,
struct ccp_cmd *cmd)
if (aes->mode == CCP_AES_MODE_CMAC)
return ccp_run_aes_cmac_cmd(cmd_q, cmd);
+ if (aes->mode == CCP_AES_MODE_GCM)
+ return ccp_run_aes_gcm_cmd(cmd_q, cmd);
+
if (!((aes->key_len == AES_KEYSIZE_128) ||
(aes->key_len == AES_KEYSIZE_192) ||
(aes->key_len == AES_KEYSIZE_256)))
diff --git a/include/linux/ccp.h b/include/linux/ccp.h
index 90a1fbe..6f78295 100644
--- a/include/linux/ccp.h
+++ b/include/linux/ccp.h
@@ -123,6 +123,10 @@ enum ccp_aes_mode {
CCP_AES_MODE_CFB,
CCP_AES_MODE_CTR,
CCP_AES_MODE_CMAC,
+ CCP_AES_MODE_GHASH,
+ CCP_AES_MODE_GCTR,
+ CCP_AES_MODE_GCM,
+ CCP_AES_MODE_GMAC,
CCP_AES_MODE__LAST,
};
@@ -137,6 +141,9 @@ enum ccp_aes_action {
CCP_AES_ACTION_ENCRYPT,
CCP_AES_ACTION__LAST,
};
+/* Overloaded field */
+#define CCP_AES_GHASHAAD CCP_AES_ACTION_DECRYPT
+#define CCP_AES_GHASHFINAL CCP_AES_ACTION_ENCRYPT
/**
* struct ccp_aes_engine - CCP AES operation
@@ -181,6 +188,8 @@ struct ccp_aes_engine {
struct scatterlist *cmac_key; /* K1/K2 cmac key required for
* final cmac cmd */
u32 cmac_key_len; /* In bytes */
+
+ u32 aad_len; /* In bytes */
};
/***** XTS-AES engine *****/
