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.amba...@freescale.com>
Signed-off-by: Horia Geanta <horia.gea...@freescale.com>
---
drivers/crypto/caam/caamalg.c | 331 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 321 insertions(+), 10 deletions(-)
diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index a80ea85..3486a69 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -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)
{
@@ -1292,6 +1556,7 @@ 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 +1591,31 @@ 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 +1642,26 @@ 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 +2602,24 @@ 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)",
--
1.8.3.1
--
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