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crypto: caam - add support for rfc4106(gcm(aes)) 

Add Advanced Encryption Standard (AES) in Galois/Counter Mode (GCM)
as an IPsec Encapsulating Security Payload (ESP) mechanism
to provide confidentiality and data origin authentication.

Signed-off-by: Tudor Ambarus <tudor.ambarus@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tudor Ambarus 2014-10-23 16:14:03 +03:00 committed by Herbert Xu
parent 3ef8d945d0
commit bac68f2c9a
1 changed files with 414 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

421
drivers/crypto/caam/caamalg.c
View File

@ -78,6 +78,11 @@
#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_RFC4106_BASE (3 * CAAM_CMD_SZ)
#define DESC_RFC4106_ENC_LEN (DESC_RFC4106_BASE + 15 * CAAM_CMD_SZ)
#define DESC_RFC4106_DEC_LEN (DESC_RFC4106_BASE + 14 * CAAM_CMD_SZ)
#define DESC_RFC4106_GIVENC_LEN (DESC_RFC4106_BASE + 21 * CAAM_CMD_SZ)
#define DESC_ABLKCIPHER_BASE (3 * CAAM_CMD_SZ)
#define DESC_ABLKCIPHER_ENC_LEN (DESC_ABLKCIPHER_BASE + \
20 * CAAM_CMD_SZ)
@ -864,6 +869,287 @@ static int gcm_setauthsize(struct crypto_aead *authenc, unsigned int authsize)
return 0;
}
static int rfc4106_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, *move_cmd, *write_iv_cmd;
u32 *desc;
u32 geniv;
if (!ctx->enckeylen || !ctx->authsize)
return 0;
/*
* RFC4106 encrypt shared descriptor
* Job Descriptor and Shared Descriptor
* must fit into the 64-word Descriptor h/w Buffer
*/
if (DESC_RFC4106_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 it is loaded due to sharing */
key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
JUMP_COND_SHRD);
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);
append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
/* assoclen + cryptlen = seqinlen - ivsize */
append_math_sub_imm_u32(desc, REG2, SEQINLEN, IMM, tfm->ivsize);
/* assoclen = (assoclen + cryptlen) - cryptlen */
append_math_sub(desc, VARSEQINLEN, REG2, REG3, CAAM_CMD_SZ);
/* Read Salt */
append_fifo_load_as_imm(desc, (void *)(ctx->key + ctx->enckeylen),
4, FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_IV);
/* Read AES-GCM-ESP 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_FLUSH1);
/* Will read cryptlen bytes */
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);
/* 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, "rfc4106 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_RFC4106_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 it is loaded due to sharing */
key_jump_cmd = append_jump(desc, JUMP_JSL |
JUMP_TEST_ALL | JUMP_COND_SHRD);
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, VARSEQINLEN, REG3, REG2, CAAM_CMD_SZ);
/* Will write cryptlen bytes */
append_math_sub(desc, VARSEQOUTLEN, SEQOUTLEN, REG0, CAAM_CMD_SZ);
/* Read Salt */
append_fifo_load_as_imm(desc, (void *)(ctx->key + ctx->enckeylen),
4, FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_IV);
/* Read AES-GCM-ESP 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_FLUSH1);
/* Will read cryptlen bytes */
append_math_add(desc, VARSEQINLEN, ZERO, REG2, CAAM_CMD_SZ);
/* Store payload data */
append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA | FIFOLDST_VLF);
/* Read encrypted data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_MSG | FIFOLD_TYPE_FLUSH1);
/* 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, "rfc4106 dec 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_RFC4106_GIVENC_LEN + DESC_JOB_IO_LEN +
ctx->split_key_pad_len + ctx->enckeylen <=
CAAM_DESC_BYTES_MAX)
keys_fit_inline = true;
/* rfc4106_givencrypt shared descriptor */
desc = ctx->sh_desc_givenc;
init_sh_desc(desc, HDR_SHARE_SERIAL);
/* Skip key loading if it is loaded due to sharing */
key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
JUMP_COND_SHRD);
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);
/* Generate IV */
geniv = NFIFOENTRY_STYPE_PAD | NFIFOENTRY_DEST_DECO |
NFIFOENTRY_DTYPE_MSG | NFIFOENTRY_LC1 |
NFIFOENTRY_PTYPE_RND | (tfm->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);
move_cmd = append_move(desc, MOVE_SRC_INFIFO | MOVE_DEST_DESCBUF |
(tfm->ivsize << MOVE_LEN_SHIFT));
append_cmd(desc, CMD_LOAD | ENABLE_AUTO_INFO_FIFO);
/* Copy generated IV to OFIFO */
write_iv_cmd = append_move(desc, MOVE_SRC_DESCBUF | MOVE_DEST_OUTFIFO |
(tfm->ivsize << MOVE_LEN_SHIFT));
/* Class 1 operation */
append_operation(desc, ctx->class1_alg_type |
OP_ALG_AS_INITFINAL | OP_ALG_ENCRYPT);
/* ivsize + cryptlen = seqoutlen - authsize */
append_math_sub_imm_u32(desc, REG3, SEQOUTLEN, IMM, ctx->authsize);
/* assoclen = seqinlen - (ivsize + cryptlen) */
append_math_sub(desc, VARSEQINLEN, SEQINLEN, REG3, CAAM_CMD_SZ);
/* Will write ivsize + cryptlen */
append_math_add(desc, VARSEQOUTLEN, REG3, REG0, CAAM_CMD_SZ);
/* Read Salt and generated IV */
append_cmd(desc, CMD_FIFO_LOAD | FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_IV |
FIFOLD_TYPE_FLUSH1 | IMMEDIATE | 12);
/* Append Salt */
append_data(desc, (void *)(ctx->key + ctx->enckeylen), 4);
set_move_tgt_here(desc, move_cmd);
set_move_tgt_here(desc, write_iv_cmd);
/* Blank commands. Will be overwritten by generated IV. */
append_cmd(desc, 0x00000000);
append_cmd(desc, 0x00000000);
/* End of blank commands */
/* No need to reload iv */
append_seq_fifo_load(desc, tfm->ivsize, FIFOLD_CLASS_SKIP);
/* Read assoc data */
append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |
FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);
/* Will read cryptlen */
append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
/* Store generated IV and 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);
/* Write ICV */
append_seq_store(desc, ctx->authsize, LDST_CLASS_1_CCB |
LDST_SRCDST_BYTE_CONTEXT);
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,
"rfc4106 givenc shdesc@"__stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc,
desc_bytes(desc), 1);
#endif
return 0;
}
static int rfc4106_setauthsize(struct crypto_aead *authenc,
unsigned int authsize)
{
struct caam_ctx *ctx = crypto_aead_ctx(authenc);
ctx->authsize = authsize;
rfc4106_set_sh_desc(authenc);
return 0;
}
static u32 gen_split_aead_key(struct caam_ctx *ctx, const u8 *key_in,
u32 authkeylen)
{
@ -967,6 +1253,45 @@ static int gcm_setkey(struct crypto_aead *aead,
return ret;
}
static int rfc4106_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;
if (keylen < 4)
return -EINVAL;
#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);
/*
* The last four bytes of the key material are used as the salt value
* in the nonce. Update the AES key length.
*/
ctx->enckeylen = keylen - 4;
ctx->key_dma = dma_map_single(jrdev, ctx->key, ctx->enckeylen,
DMA_TO_DEVICE);
if (dma_mapping_error(jrdev, ctx->key_dma)) {
dev_err(jrdev, "unable to map key i/o memory\n");
return -ENOMEM;
}
ret = rfc4106_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)
{
@ -1437,6 +1762,7 @@ static void init_aead_giv_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",
@ -1454,10 +1780,18 @@ static void init_aead_giv_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 (contig & GIV_SRC_CONTIG) {
if (is_gcm)
src_dma = edesc->iv_dma;
else
src_dma = sg_dma_address(req->assoc);
in_options = 0;
} else {
@ -1473,7 +1807,8 @@ static void init_aead_giv_job(u32 *sh_desc, dma_addr_t ptr,
} else {
if (likely(req->src == req->dst)) {
dst_dma = src_dma + sizeof(struct sec4_sg_entry) *
edesc->assoc_nents;
(edesc->assoc_nents +
(is_gcm ? 1 + edesc->src_nents : 0));
out_options = LDST_SGF;
} else {
dst_dma = edesc->sec4_sg_dma +
@ -1792,6 +2127,7 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request
int ivsize = crypto_aead_ivsize(aead);
bool assoc_chained = false, src_chained = false, dst_chained = false;
int sec4_sg_index, sec4_sg_len = 0, sec4_sg_bytes;
bool is_gcm = false;
assoc_nents = sg_count(req->assoc, req->assoclen, &assoc_chained);
src_nents = sg_count(req->src, req->cryptlen, &src_chained);
@ -1818,16 +2154,33 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request
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))
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) {
if (assoc_nents || iv_dma + ivsize !=
sg_dma_address(req->assoc) || src_nents ||
sg_dma_address(req->assoc) + req->assoclen !=
sg_dma_address(req->src))
contig &= ~GIV_SRC_CONTIG;
} else {
if (assoc_nents ||
sg_dma_address(req->assoc) + req->assoclen != iv_dma ||
src_nents || iv_dma + ivsize != sg_dma_address(req->src))
contig &= ~GIV_SRC_CONTIG;
}
if (dst_nents || iv_dma + ivsize != sg_dma_address(req->dst))
contig &= ~GIV_DST_CONTIG;
if (unlikely(req->src != req->dst)) {
dst_nents = dst_nents ? : 1;
sec4_sg_len += 1;
}
if (!(contig & GIV_SRC_CONTIG)) {
assoc_nents = assoc_nents ? : 1;
src_nents = src_nents ? : 1;
@ -1835,7 +2188,18 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request
if (likely(req->src == req->dst))
contig &= ~GIV_DST_CONTIG;
}
sec4_sg_len += dst_nents;
/*
* Add new sg entries for GCM output sequence.
* Expected output sequence: IV, encrypted text.
*/
if (is_gcm && req->src == req->dst && !(contig & GIV_DST_CONTIG))
sec4_sg_len += 1 + src_nents;
if (unlikely(req->src != req->dst)) {
dst_nents = dst_nents ? : 1;
sec4_sg_len += 1 + dst_nents;
}
sec4_sg_bytes = sec4_sg_len * sizeof(struct sec4_sg_entry);
@ -1861,18 +2225,36 @@ static struct aead_edesc *aead_giv_edesc_alloc(struct aead_givcrypt_request
sec4_sg_index = 0;
if (!(contig & GIV_SRC_CONTIG)) {
if (!is_gcm) {
sg_to_sec4_sg(req->assoc, assoc_nents,
edesc->sec4_sg +
sec4_sg_index, 0);
edesc->sec4_sg + sec4_sg_index, 0);
sec4_sg_index += assoc_nents;
}
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,
edesc->sec4_sg + sec4_sg_index, 0);
sec4_sg_index += assoc_nents;
}
sg_to_sec4_sg_last(req->src, src_nents,
edesc->sec4_sg +
sec4_sg_index, 0);
sec4_sg_index += src_nents;
}
if (is_gcm && req->src == req->dst && !(contig & GIV_DST_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->src, src_nents,
edesc->sec4_sg + sec4_sg_index, 0);
}
if (unlikely(req->src != req->dst && !(contig & GIV_DST_CONTIG))) {
dma_to_sec4_sg_one(edesc->sec4_sg + sec4_sg_index,
iv_dma, ivsize, 0);
@ -2611,6 +2993,23 @@ static struct caam_alg_template driver_algs[] = {
OP_ALG_AAI_HMAC_PRECOMP,
.alg_op = OP_ALG_ALGSEL_SHA512 | OP_ALG_AAI_HMAC,
},
{
.name = "rfc4106(gcm(aes))",
.driver_name = "rfc4106-gcm-aes-caam",
.blocksize = 1,
.type = CRYPTO_ALG_TYPE_AEAD,
.template_aead = {
.setkey = rfc4106_setkey,
.setauthsize = rfc4106_setauthsize,
.encrypt = aead_encrypt,
.decrypt = aead_decrypt,
.givencrypt = aead_givencrypt,
.geniv = "<built-in>",
.ivsize = 8,
.maxauthsize = AES_BLOCK_SIZE,
},
.class1_alg_type = OP_ALG_ALGSEL_AES | OP_ALG_AAI_GCM,
},
/* Galois Counter Mode */
{
.name = "gcm(aes)",