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crypto: caam - add support for gcm(aes)

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Add support for AES working in Galois Counter Mode.

There is a limitation related to IV size, similar to the one present in
SW implementation (crypto/gcm.c):
The only IV size allowed is 12 bytes. It will be padded by HW to the right
with 0x0000_0001 (up to 16 bytes - AES block size), according to the GCM
specification.

Signed-off-by: Tudor Ambarus <tudor.ambarus@freescale.com>
Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tudor Ambarus 2014-10-23 16:11:23 +03:00 committed by Herbert Xu
parent 61daf055ea
commit 3ef8d945d0
1 changed files with 331 additions and 11 deletions
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342
drivers/crypto/caam/caamalg.c
View file

@ -74,6 +74,10 @@
#define DESC_AEAD_NULL_ENC_LEN (DESC_AEAD_NULL_BASE + 14 * CAAM_CMD_SZ)
#define DESC_AEAD_NULL_DEC_LEN (DESC_AEAD_NULL_BASE + 17 * CAAM_CMD_SZ)
#define DESC_GCM_BASE (3 * CAAM_CMD_SZ)
#define DESC_GCM_ENC_LEN (DESC_GCM_BASE + 23 * CAAM_CMD_SZ)
#define DESC_GCM_DEC_LEN (DESC_GCM_BASE + 19 * CAAM_CMD_SZ)
#define DESC_ABLKCIPHER_BASE (3 * CAAM_CMD_SZ)
#define DESC_ABLKCIPHER_ENC_LEN (DESC_ABLKCIPHER_BASE + \
20 * CAAM_CMD_SZ)
@ -630,6 +634,236 @@ static int aead_setauthsize(struct crypto_aead *authenc,
return 0;
}
static int gcm_set_sh_desc(struct crypto_aead *aead)
{
struct aead_tfm *tfm = &aead->base.crt_aead;
struct caam_ctx *ctx = crypto_aead_ctx(aead);
struct device *jrdev = ctx->jrdev;
bool keys_fit_inline = false;
u32 *key_jump_cmd, *zero_payload_jump_cmd,
*zero_assoc_jump_cmd1, *zero_assoc_jump_cmd2;
u32 *desc;
if (!ctx->enckeylen || !ctx->authsize)
return 0;
/*
* AES GCM encrypt shared descriptor
* Job Descriptor and Shared Descriptor
* must fit into the 64-word Descriptor h/w Buffer
*/
if (DESC_GCM_ENC_LEN + DESC_JOB_IO_LEN +
ctx->enckeylen <= CAAM_DESC_BYTES_MAX)
keys_fit_inline = true;
desc = ctx->sh_desc_enc;
init_sh_desc(desc, HDR_SHARE_SERIAL);
/* skip key loading if they are loaded due to sharing */
key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
JUMP_COND_SHRD | JUMP_COND_SELF);
if (keys_fit_inline)
append_key_as_imm(desc, (void *)ctx->key, ctx->enckeylen,
ctx->enckeylen, CLASS_1 | KEY_DEST_CLASS_REG);
else
append_key(desc, ctx->key_dma, ctx->enckeylen,
CLASS_1 | KEY_DEST_CLASS_REG);
set_jump_tgt_here(desc, key_jump_cmd);
/* class 1 operation */
append_operation(desc, ctx->class1_alg_type |
OP_ALG_AS_INITFINAL | OP_ALG_ENCRYPT);
/* cryptlen = seqoutlen - authsize */
append_math_sub_imm_u32(desc, REG3, SEQOUTLEN, IMM, ctx->authsize);
/* assoclen + cryptlen = seqinlen - ivsize */
append_math_sub_imm_u32(desc, REG2, SEQINLEN, IMM, tfm->ivsize);
/* assoclen = (assoclen + cryptlen) - cryptlen */
append_math_sub(desc, REG1, REG2, REG3, CAAM_CMD_SZ);
/* if cryptlen is ZERO jump to zero-payload commands */
append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
zero_payload_jump_cmd = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
/* read IV */
append_seq_fifo_load(desc, tfm->ivsize, FIFOLD_CLASS_CLASS1 |
FIFOLD_TYPE_IV | FIFOLD_TYPE_FLUSH1);
/* if assoclen is ZERO, skip reading the assoc data */
append_math_add(desc, VARSEQINLEN, ZERO, REG1, CAAM_CMD_SZ);
zero_assoc_jump_cmd1 = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
/* read assoc data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);
set_jump_tgt_here(desc, zero_assoc_jump_cmd1);
append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
/* write encrypted data */
append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA | FIFOLDST_VLF);
/* read payload data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST1);
/* jump the zero-payload commands */
append_jump(desc, JUMP_TEST_ALL | 7);
/* zero-payload commands */
set_jump_tgt_here(desc, zero_payload_jump_cmd);
/* if assoclen is ZERO, jump to IV reading - is the only input data */
append_math_add(desc, VARSEQINLEN, ZERO, REG1, CAAM_CMD_SZ);
zero_assoc_jump_cmd2 = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
/* read IV */
append_seq_fifo_load(desc, tfm->ivsize, FIFOLD_CLASS_CLASS1 |
FIFOLD_TYPE_IV | FIFOLD_TYPE_FLUSH1);
/* read assoc data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_AAD | FIFOLD_TYPE_LAST1);
/* jump to ICV writing */
append_jump(desc, JUMP_TEST_ALL | 2);
/* read IV - is the only input data */
set_jump_tgt_here(desc, zero_assoc_jump_cmd2);
append_seq_fifo_load(desc, tfm->ivsize, FIFOLD_CLASS_CLASS1 |
FIFOLD_TYPE_IV | FIFOLD_TYPE_FLUSH1 |
FIFOLD_TYPE_LAST1);
/* write ICV */
append_seq_store(desc, ctx->authsize, LDST_CLASS_1_CCB |
LDST_SRCDST_BYTE_CONTEXT);
ctx->sh_desc_enc_dma = dma_map_single(jrdev, desc,
desc_bytes(desc),
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, ctx->sh_desc_enc_dma)) {
dev_err(jrdev, "unable to map shared descriptor\n");
return -ENOMEM;
}
#ifdef DEBUG
print_hex_dump(KERN_ERR, "gcm enc shdesc@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc,
desc_bytes(desc), 1);
#endif
/*
* Job Descriptor and Shared Descriptors
* must all fit into the 64-word Descriptor h/w Buffer
*/
keys_fit_inline = false;
if (DESC_GCM_DEC_LEN + DESC_JOB_IO_LEN +
ctx->enckeylen <= CAAM_DESC_BYTES_MAX)
keys_fit_inline = true;
desc = ctx->sh_desc_dec;
init_sh_desc(desc, HDR_SHARE_SERIAL);
/* skip key loading if they are loaded due to sharing */
key_jump_cmd = append_jump(desc, JUMP_JSL |
JUMP_TEST_ALL | JUMP_COND_SHRD |
JUMP_COND_SELF);
if (keys_fit_inline)
append_key_as_imm(desc, (void *)ctx->key, ctx->enckeylen,
ctx->enckeylen, CLASS_1 | KEY_DEST_CLASS_REG);
else
append_key(desc, ctx->key_dma, ctx->enckeylen,
CLASS_1 | KEY_DEST_CLASS_REG);
set_jump_tgt_here(desc, key_jump_cmd);
/* class 1 operation */
append_operation(desc, ctx->class1_alg_type |
OP_ALG_AS_INITFINAL | OP_ALG_DECRYPT | OP_ALG_ICV_ON);
/* assoclen + cryptlen = seqinlen - ivsize - icvsize */
append_math_sub_imm_u32(desc, REG3, SEQINLEN, IMM,
ctx->authsize + tfm->ivsize);
/* assoclen = (assoclen + cryptlen) - cryptlen */
append_math_sub(desc, REG2, SEQOUTLEN, REG0, CAAM_CMD_SZ);
append_math_sub(desc, REG1, REG3, REG2, CAAM_CMD_SZ);
/* read IV */
append_seq_fifo_load(desc, tfm->ivsize, FIFOLD_CLASS_CLASS1 |
FIFOLD_TYPE_IV | FIFOLD_TYPE_FLUSH1);
/* jump to zero-payload command if cryptlen is zero */
append_math_add(desc, VARSEQOUTLEN, ZERO, REG2, CAAM_CMD_SZ);
zero_payload_jump_cmd = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
append_math_add(desc, VARSEQINLEN, ZERO, REG1, CAAM_CMD_SZ);
/* if asoclen is ZERO, skip reading assoc data */
zero_assoc_jump_cmd1 = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
/* read assoc data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);
set_jump_tgt_here(desc, zero_assoc_jump_cmd1);
append_math_add(desc, VARSEQINLEN, ZERO, REG2, CAAM_CMD_SZ);
/* store encrypted data */
append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA | FIFOLDST_VLF);
/* read payload data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_MSG | FIFOLD_TYPE_FLUSH1);
/* jump the zero-payload commands */
append_jump(desc, JUMP_TEST_ALL | 4);
/* zero-payload command */
set_jump_tgt_here(desc, zero_payload_jump_cmd);
/* if assoclen is ZERO, jump to ICV reading */
append_math_add(desc, VARSEQINLEN, ZERO, REG1, CAAM_CMD_SZ);
zero_assoc_jump_cmd2 = append_jump(desc, JUMP_TEST_ALL |
JUMP_COND_MATH_Z);
/* read assoc data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);
set_jump_tgt_here(desc, zero_assoc_jump_cmd2);
/* read ICV */
append_seq_fifo_load(desc, ctx->authsize, FIFOLD_CLASS_CLASS1 |
FIFOLD_TYPE_ICV | FIFOLD_TYPE_LAST1);
ctx->sh_desc_dec_dma = dma_map_single(jrdev, desc,
desc_bytes(desc),
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, ctx->sh_desc_dec_dma)) {
dev_err(jrdev, "unable to map shared descriptor\n");
return -ENOMEM;
}
#ifdef DEBUG
print_hex_dump(KERN_ERR, "gcm dec shdesc@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc,
desc_bytes(desc), 1);
#endif
return 0;
}
static int gcm_setauthsize(struct crypto_aead *authenc, unsigned int authsize)
{
struct caam_ctx *ctx = crypto_aead_ctx(authenc);
ctx->authsize = authsize;
gcm_set_sh_desc(authenc);
return 0;
}
static u32 gen_split_aead_key(struct caam_ctx *ctx, const u8 *key_in,
u32 authkeylen)
{
@ -703,6 +937,36 @@ badkey:
return -EINVAL;
}
static int gcm_setkey(struct crypto_aead *aead,
const u8 *key, unsigned int keylen)
{
struct caam_ctx *ctx = crypto_aead_ctx(aead);
struct device *jrdev = ctx->jrdev;
int ret = 0;
#ifdef DEBUG
print_hex_dump(KERN_ERR, "key in @"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, key, keylen, 1);
#endif
memcpy(ctx->key, key, keylen);
ctx->key_dma = dma_map_single(jrdev, ctx->key, keylen,
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, ctx->key_dma)) {
dev_err(jrdev, "unable to map key i/o memory\n");
return -ENOMEM;
}
ctx->enckeylen = keylen;
ret = gcm_set_sh_desc(aead);
if (ret) {
dma_unmap_single(jrdev, ctx->key_dma, ctx->enckeylen,
DMA_TO_DEVICE);
}
return ret;
}
static int ablkcipher_setkey(struct crypto_ablkcipher *ablkcipher,
const u8 *key, unsigned int keylen)
{
@ -1088,6 +1352,7 @@ static void init_aead_job(u32 *sh_desc, dma_addr_t ptr,
u32 out_options = 0, in_options;
dma_addr_t dst_dma, src_dma;
int len, sec4_sg_index = 0;
bool is_gcm = false;
#ifdef DEBUG
debug("assoclen %d cryptlen %d authsize %d\n",
@ -1106,11 +1371,19 @@ static void init_aead_job(u32 *sh_desc, dma_addr_t ptr,
desc_bytes(sh_desc), 1);
#endif
if (((ctx->class1_alg_type & OP_ALG_ALGSEL_MASK) ==
OP_ALG_ALGSEL_AES) &&
((ctx->class1_alg_type & OP_ALG_AAI_MASK) == OP_ALG_AAI_GCM))
is_gcm = true;
len = desc_len(sh_desc);
init_job_desc_shared(desc, ptr, len, HDR_SHARE_DEFER | HDR_REVERSE);
if (all_contig) {
src_dma = sg_dma_address(req->assoc);
if (is_gcm)
src_dma = edesc->iv_dma;
else
src_dma = sg_dma_address(req->assoc);
in_options = 0;
} else {
src_dma = edesc->sec4_sg_dma;
@ -1292,6 +1565,7 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
int ivsize = crypto_aead_ivsize(aead);
int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
unsigned int authsize = ctx->authsize;
bool is_gcm = false;
assoc_nents = sg_count(req->assoc, req->assoclen, &assoc_chained);
@ -1326,15 +1600,31 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
return ERR_PTR(-ENOMEM);
}
/* Check if data are contiguous */
if (assoc_nents || sg_dma_address(req->assoc) + req->assoclen !=
iv_dma || src_nents || iv_dma + ivsize !=
sg_dma_address(req->src)) {
all_contig = false;
if (((ctx->class1_alg_type & OP_ALG_ALGSEL_MASK) ==
OP_ALG_ALGSEL_AES) &&
((ctx->class1_alg_type & OP_ALG_AAI_MASK) == OP_ALG_AAI_GCM))
is_gcm = true;
/*
* Check if data are contiguous.
* GCM expected input sequence: IV, AAD, text
* All other - expected input sequence: AAD, IV, text
*/
if (is_gcm)
all_contig = (!assoc_nents &&
iv_dma + ivsize == sg_dma_address(req->assoc) &&
!src_nents && sg_dma_address(req->assoc) +
req->assoclen == sg_dma_address(req->src));
else
all_contig = (!assoc_nents && sg_dma_address(req->assoc) +
req->assoclen == iv_dma && !src_nents &&
iv_dma + ivsize == sg_dma_address(req->src));
if (!all_contig) {
assoc_nents = assoc_nents ? : 1;
src_nents = src_nents ? : 1;
sec4_sg_len = assoc_nents + 1 + src_nents;
}
sec4_sg_len += dst_nents;
sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
@ -1361,14 +1651,26 @@ static struct aead_edesc *aead_edesc_alloc(struct aead_request *req,
sec4_sg_index = 0;
if (!all_contig) {
sg_to_sec4_sg(req->assoc,
(assoc_nents ? : 1),
edesc->sec4_sg +
sec4_sg_index, 0);
sec4_sg_index += assoc_nents ? : 1;
if (!is_gcm) {
sg_to_sec4_sg(req->assoc,
(assoc_nents ? : 1),
edesc->sec4_sg +
sec4_sg_index, 0);
sec4_sg_index += assoc_nents ? : 1;
}
dma_to_sec4_sg_one(edesc->sec4_sg + sec4_sg_index,
iv_dma, ivsize, 0);
sec4_sg_index += 1;
if (is_gcm) {
sg_to_sec4_sg(req->assoc,
(assoc_nents ? : 1),
edesc->sec4_sg +
sec4_sg_index, 0);
sec4_sg_index += assoc_nents ? : 1;
}
sg_to_sec4_sg_last(req->src,
(src_nents ? : 1),
edesc->sec4_sg +
@ -2309,6 +2611,24 @@ static struct caam_alg_template driver_algs[] = {
OP_ALG_AAI_HMAC_PRECOMP,
.alg_op = OP_ALG_ALGSEL_SHA512 | OP_ALG_AAI_HMAC,
},
/* Galois Counter Mode */
{
.name = "gcm(aes)",
.driver_name = "gcm-aes-caam",
.blocksize = 1,
.type = CRYPTO_ALG_TYPE_AEAD,
.template_aead = {
.setkey = gcm_setkey,
.setauthsize = gcm_setauthsize,
.encrypt = aead_encrypt,
.decrypt = aead_decrypt,
.givencrypt = NULL,
.geniv = "<built-in>",
.ivsize = 12,
.maxauthsize = AES_BLOCK_SIZE,
},
.class1_alg_type = OP_ALG_ALGSEL_AES | OP_ALG_AAI_GCM,
},
/* ablkcipher descriptor */
{
.name = "cbc(aes)",