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crypto: caam - add support for givencrypt cbc(aes) and rfc3686(ctr(aes))
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Add support for one-shot givencrypt algorithms.
Givencrypt algorithms will generate their IV and encrypt data
within the same shared job descriptors.
Current algorithms merged from ablkcipher to givencrypt are:
 - AES Cipher Block Chaining (CBC)
 - AES Counter Mode (CTR) compliant with RFC3686

Signed-off-by: Catalin Vasile <catalin.vasile@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Catalin Vasile authored and Herbert Xu committed Nov 6, 2014
1 parent daebc46 commit 7222d1a
Showing 1 changed file with 281 additions and 4 deletions.
285 changes: 281 additions & 4 deletions drivers/crypto/caam/caamalg.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1835,6 +1835,7 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
u32 *key_jump_cmd;
u32 *desc;
u32 *nonce;
u32 geniv;
u32 ctx1_iv_off = 0;
const bool ctr_mode = ((ctx->class1_alg_type & OP_ALG_AAI_MASK) ==
OP_ALG_AAI_CTR_MOD128);
Expand Down Expand Up @@ -1993,6 +1994,83 @@ static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
DUMP_PREFIX_ADDRESS, 16, 4, desc,
desc_bytes(desc), 1);
#endif
/* ablkcipher_givencrypt shared descriptor */
desc = ctx->sh_desc_givenc;

init_sh_desc(desc, HDR_SHARE_SERIAL | HDR_SAVECTX);
/* Skip if already shared */
key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
JUMP_COND_SHRD);

/* Load class1 key only */
append_key_as_imm(desc, (void *)ctx->key, ctx->enckeylen,
ctx->enckeylen, CLASS_1 |
KEY_DEST_CLASS_REG);

/* Load Nonce into CONTEXT1 reg */
if (is_rfc3686) {
nonce = (u32 *)(key + keylen);
append_load_imm_u32(desc, *nonce, LDST_CLASS_IND_CCB |
LDST_SRCDST_BYTE_OUTFIFO | LDST_IMM);
append_move(desc, MOVE_WAITCOMP |
MOVE_SRC_OUTFIFO |
MOVE_DEST_CLASS1CTX |
(16 << MOVE_OFFSET_SHIFT) |
(CTR_RFC3686_NONCE_SIZE << MOVE_LEN_SHIFT));
}
set_jump_tgt_here(desc, key_jump_cmd);

/* Generate IV */
geniv = NFIFOENTRY_STYPE_PAD | NFIFOENTRY_DEST_DECO |
NFIFOENTRY_DTYPE_MSG | NFIFOENTRY_LC1 |
NFIFOENTRY_PTYPE_RND | (crt->ivsize << NFIFOENTRY_DLEN_SHIFT);
append_load_imm_u32(desc, geniv, LDST_CLASS_IND_CCB |
LDST_SRCDST_WORD_INFO_FIFO | LDST_IMM);
append_cmd(desc, CMD_LOAD | DISABLE_AUTO_INFO_FIFO);
append_move(desc, MOVE_WAITCOMP |
MOVE_SRC_INFIFO |
MOVE_DEST_CLASS1CTX |
(crt->ivsize << MOVE_LEN_SHIFT) |
(ctx1_iv_off << MOVE_OFFSET_SHIFT));
append_cmd(desc, CMD_LOAD | ENABLE_AUTO_INFO_FIFO);

/* Copy generated IV to memory */
append_seq_store(desc, crt->ivsize,
LDST_SRCDST_BYTE_CONTEXT | LDST_CLASS_1_CCB |
(ctx1_iv_off << LDST_OFFSET_SHIFT));

/* Load Counter into CONTEXT1 reg */
if (is_rfc3686)
append_load_imm_u32(desc, (u32)1, LDST_IMM |
LDST_CLASS_1_CCB |
LDST_SRCDST_BYTE_CONTEXT |
((ctx1_iv_off + CTR_RFC3686_IV_SIZE) <<
LDST_OFFSET_SHIFT));

if (ctx1_iv_off)
append_jump(desc, JUMP_JSL | JUMP_TEST_ALL | JUMP_COND_NCP |
(1 << JUMP_OFFSET_SHIFT));

/* Load operation */
append_operation(desc, ctx->class1_alg_type |
OP_ALG_AS_INITFINAL | OP_ALG_ENCRYPT);

/* Perform operation */
ablkcipher_append_src_dst(desc);

ctx->sh_desc_givenc_dma = dma_map_single(jrdev, desc,
desc_bytes(desc),
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, ctx->sh_desc_givenc_dma)) {
dev_err(jrdev, "unable to map shared descriptor\n");
return -ENOMEM;
}
#ifdef DEBUG
print_hex_dump(KERN_ERR,
"ablkcipher givenc shdesc@" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc,
desc_bytes(desc), 1);
#endif

return ret;
}
Expand Down Expand Up @@ -2479,6 +2557,54 @@ static void init_ablkcipher_job(u32 *sh_desc, dma_addr_t ptr,
append_seq_out_ptr(desc, dst_dma, req->nbytes, out_options);
}

/*
* Fill in ablkcipher givencrypt job descriptor
*/
static void init_ablkcipher_giv_job(u32 *sh_desc, dma_addr_t ptr,
struct ablkcipher_edesc *edesc,
struct ablkcipher_request *req,
bool iv_contig)
{
struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
int ivsize = crypto_ablkcipher_ivsize(ablkcipher);
u32 *desc = edesc->hw_desc;
u32 out_options, in_options;
dma_addr_t dst_dma, src_dma;
int len, sec4_sg_index = 0;

#ifdef DEBUG
print_hex_dump(KERN_ERR, "presciv@" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, req->info,
ivsize, 1);
print_hex_dump(KERN_ERR, "src @" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, sg_virt(req->src),
edesc->src_nents ? 100 : req->nbytes, 1);
#endif

len = desc_len(sh_desc);
init_job_desc_shared(desc, ptr, len, HDR_SHARE_DEFER | HDR_REVERSE);

if (!edesc->src_nents) {
src_dma = sg_dma_address(req->src);
in_options = 0;
} else {
src_dma = edesc->sec4_sg_dma;
sec4_sg_index += edesc->src_nents;
in_options = LDST_SGF;
}
append_seq_in_ptr(desc, src_dma, req->nbytes, in_options);

if (iv_contig) {
dst_dma = edesc->iv_dma;
out_options = 0;
} else {
dst_dma = edesc->sec4_sg_dma +
sec4_sg_index * sizeof(struct sec4_sg_entry);
out_options = LDST_SGF;
}
append_seq_out_ptr(desc, dst_dma, req->nbytes + ivsize, out_options);
}

/*
* allocate and map the aead extended descriptor
*/
Expand Down Expand Up @@ -3099,6 +3225,151 @@ static int ablkcipher_decrypt(struct ablkcipher_request *req)
return ret;
}

/*
* allocate and map the ablkcipher extended descriptor
* for ablkcipher givencrypt
*/
static struct ablkcipher_edesc *ablkcipher_giv_edesc_alloc(
struct skcipher_givcrypt_request *greq,
int desc_bytes,
bool *iv_contig_out)
{
struct ablkcipher_request *req = &greq->creq;
struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
struct caam_ctx *ctx = crypto_ablkcipher_ctx(ablkcipher);
struct device *jrdev = ctx->jrdev;
gfp_t flags = (req->base.flags & (CRYPTO_TFM_REQ_MAY_BACKLOG |
CRYPTO_TFM_REQ_MAY_SLEEP)) ?
GFP_KERNEL : GFP_ATOMIC;
int src_nents, dst_nents = 0, sec4_sg_bytes;
struct ablkcipher_edesc *edesc;
dma_addr_t iv_dma = 0;
bool iv_contig = false;
int sgc;
int ivsize = crypto_ablkcipher_ivsize(ablkcipher);
bool src_chained = false, dst_chained = false;
int sec4_sg_index;

src_nents = sg_count(req->src, req->nbytes, &src_chained);

if (unlikely(req->dst != req->src))
dst_nents = sg_count(req->dst, req->nbytes, &dst_chained);

if (likely(req->src == req->dst)) {
sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,
DMA_BIDIRECTIONAL, src_chained);
} else {
sgc = dma_map_sg_chained(jrdev, req->src, src_nents ? : 1,
DMA_TO_DEVICE, src_chained);
sgc = dma_map_sg_chained(jrdev, req->dst, dst_nents ? : 1,
DMA_FROM_DEVICE, dst_chained);
}

/*
* Check if iv can be contiguous with source and destination.
* If so, include it. If not, create scatterlist.
*/
iv_dma = dma_map_single(jrdev, greq->giv, ivsize, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, iv_dma)) {
dev_err(jrdev, "unable to map IV\n");
return ERR_PTR(-ENOMEM);
}

if (!dst_nents && iv_dma + ivsize == sg_dma_address(req->dst))
iv_contig = true;
else
dst_nents = dst_nents ? : 1;
sec4_sg_bytes = ((iv_contig ? 0 : 1) + src_nents + dst_nents) *
sizeof(struct sec4_sg_entry);

/* allocate space for base edesc and hw desc commands, link tables */
edesc = kmalloc(sizeof(*edesc) + desc_bytes +
sec4_sg_bytes, GFP_DMA | flags);
if (!edesc) {
dev_err(jrdev, "could not allocate extended descriptor\n");
return ERR_PTR(-ENOMEM);
}

edesc->src_nents = src_nents;
edesc->src_chained = src_chained;
edesc->dst_nents = dst_nents;
edesc->dst_chained = dst_chained;
edesc->sec4_sg_bytes = sec4_sg_bytes;
edesc->sec4_sg = (void *)edesc + sizeof(struct ablkcipher_edesc) +
desc_bytes;

sec4_sg_index = 0;
if (src_nents) {
sg_to_sec4_sg_last(req->src, src_nents, edesc->sec4_sg, 0);
sec4_sg_index += src_nents;
}

if (!iv_contig) {
dma_to_sec4_sg_one(edesc->sec4_sg + sec4_sg_index,
iv_dma, ivsize, 0);
sec4_sg_index += 1;
sg_to_sec4_sg_last(req->dst, dst_nents,
edesc->sec4_sg + sec4_sg_index, 0);
}

edesc->sec4_sg_dma = dma_map_single(jrdev, edesc->sec4_sg,
sec4_sg_bytes, DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, edesc->sec4_sg_dma)) {
dev_err(jrdev, "unable to map S/G table\n");
return ERR_PTR(-ENOMEM);
}
edesc->iv_dma = iv_dma;

#ifdef DEBUG
print_hex_dump(KERN_ERR,
"ablkcipher sec4_sg@" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, edesc->sec4_sg,
sec4_sg_bytes, 1);
#endif

*iv_contig_out = iv_contig;
return edesc;
}

static int ablkcipher_givencrypt(struct skcipher_givcrypt_request *creq)
{
struct ablkcipher_request *req = &creq->creq;
struct ablkcipher_edesc *edesc;
struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
struct caam_ctx *ctx = crypto_ablkcipher_ctx(ablkcipher);
struct device *jrdev = ctx->jrdev;
bool iv_contig;
u32 *desc;
int ret = 0;

/* allocate extended descriptor */
edesc = ablkcipher_giv_edesc_alloc(creq, DESC_JOB_IO_LEN *
CAAM_CMD_SZ, &iv_contig);
if (IS_ERR(edesc))
return PTR_ERR(edesc);

/* Create and submit job descriptor*/
init_ablkcipher_giv_job(ctx->sh_desc_givenc, ctx->sh_desc_givenc_dma,
edesc, req, iv_contig);
#ifdef DEBUG
print_hex_dump(KERN_ERR,
"ablkcipher jobdesc@" __stringify(__LINE__) ": ",
DUMP_PREFIX_ADDRESS, 16, 4, edesc->hw_desc,
desc_bytes(edesc->hw_desc), 1);
#endif
desc = edesc->hw_desc;
ret = caam_jr_enqueue(jrdev, desc, ablkcipher_encrypt_done, req);

if (!ret) {
ret = -EINPROGRESS;
} else {
ablkcipher_unmap(jrdev, edesc, req);
kfree(edesc);
}

return ret;
}

#define template_aead template_u.aead
#define template_ablkcipher template_u.ablkcipher
struct caam_alg_template {
Expand Down Expand Up @@ -3769,12 +4040,13 @@ static struct caam_alg_template driver_algs[] = {
.name = "cbc(aes)",
.driver_name = "cbc-aes-caam",
.blocksize = AES_BLOCK_SIZE,
.type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.type = CRYPTO_ALG_TYPE_GIVCIPHER,
.template_ablkcipher = {
.setkey = ablkcipher_setkey,
.encrypt = ablkcipher_encrypt,
.decrypt = ablkcipher_decrypt,
.geniv = "eseqiv",
.givencrypt = ablkcipher_givencrypt,
.geniv = "<built-in>",
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
Expand Down Expand Up @@ -3833,12 +4105,13 @@ static struct caam_alg_template driver_algs[] = {
.name = "rfc3686(ctr(aes))",
.driver_name = "rfc3686-ctr-aes-caam",
.blocksize = 1,
.type = CRYPTO_ALG_TYPE_ABLKCIPHER,
.type = CRYPTO_ALG_TYPE_GIVCIPHER,
.template_ablkcipher = {
.setkey = ablkcipher_setkey,
.encrypt = ablkcipher_encrypt,
.decrypt = ablkcipher_decrypt,
.geniv = "seqiv",
.givencrypt = ablkcipher_givencrypt,
.geniv = "<built-in>",
.min_keysize = AES_MIN_KEY_SIZE +
CTR_RFC3686_NONCE_SIZE,
.max_keysize = AES_MAX_KEY_SIZE +
Expand Down Expand Up @@ -3946,6 +4219,10 @@ static struct caam_crypto_alg *caam_alg_alloc(struct caam_alg_template
alg->cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_KERN_DRIVER_ONLY |
template->type;
switch (template->type) {
case CRYPTO_ALG_TYPE_GIVCIPHER:
alg->cra_type = &crypto_givcipher_type;
alg->cra_ablkcipher = template->template_ablkcipher;
break;
case CRYPTO_ALG_TYPE_ABLKCIPHER:
alg->cra_type = &crypto_ablkcipher_type;
alg->cra_ablkcipher = template->template_ablkcipher;
Expand Down

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