From 0200020bc2b8192c31dc57c600865267f51bface Mon Sep 17 00:00:00 2001 From: Raul Cardenas Date: Fri, 27 Feb 2015 11:22:06 -0600 Subject: imx6: Added DEK blob generator command Freescale's SEC block has built-in Data Encryption Key(DEK) Blob Protocol which provides a method for protecting a DEK for non-secure memory storage. SEC block protects data in a data structure called a Secret Key Blob, which provides both confidentiality and integrity protection. Every time the blob encapsulation is executed, a AES-256 key is randomly generated to encrypt the DEK. This key is encrypted with the OTP Secret key from SoC. The resulting blob consists of the encrypted AES-256 key, the encrypted DEK, and a 16-bit MAC. During decapsulation, the reverse process is performed to get back the original DEK. A caveat to the blob decapsulation process, is that the DEK is decrypted in secure-memory and can only be read by FSL SEC HW. The DEK is used to decrypt data during encrypted boot. Commands added -------------- dek_blob - encapsulating DEK as a cryptgraphic blob Commands Syntax --------------- dek_blob src dst len Encapsulate and create blob of a len-bits DEK at address src and store the result at address dst. Signed-off-by: Raul Cardenas Signed-off-by: Nitin Garg Signed-off-by: Ulises Cardenas Signed-off-by: Ulises Cardenas-B45798 --- drivers/crypto/fsl/Makefile | 2 +- drivers/crypto/fsl/desc.h | 15 +++++ drivers/crypto/fsl/fsl_blob.c | 52 +++++++++++++++ drivers/crypto/fsl/jobdesc.c | 149 +++++++++++++++++++++++++++++++++++++++++- drivers/crypto/fsl/jobdesc.h | 14 ++++ drivers/crypto/fsl/jr.c | 31 +++++++-- 6 files changed, 256 insertions(+), 7 deletions(-) (limited to 'drivers/crypto') diff --git a/drivers/crypto/fsl/Makefile b/drivers/crypto/fsl/Makefile index c0cf64229e..4aa91e4393 100644 --- a/drivers/crypto/fsl/Makefile +++ b/drivers/crypto/fsl/Makefile @@ -8,5 +8,5 @@ obj-y += sec.o obj-$(CONFIG_FSL_CAAM) += jr.o fsl_hash.o jobdesc.o error.o -obj-$(CONFIG_CMD_BLOB) += fsl_blob.o +obj-$(CONFIG_CMD_BLOB)$(CONFIG_CMD_DEKBLOB) += fsl_blob.o obj-$(CONFIG_RSA_FREESCALE_EXP) += fsl_rsa.o diff --git a/drivers/crypto/fsl/desc.h b/drivers/crypto/fsl/desc.h index 504f2b07d0..18e2ec8d26 100644 --- a/drivers/crypto/fsl/desc.h +++ b/drivers/crypto/fsl/desc.h @@ -12,11 +12,18 @@ #ifndef DESC_H #define DESC_H +#define KEY_BLOB_SIZE 32 +#define MAC_SIZE 16 + /* Max size of any CAAM descriptor in 32-bit words, inclusive of header */ #define MAX_CAAM_DESCSIZE 64 +/* Size of DEK Blob descriptor, inclusive of header */ +#define DEK_BLOB_DESCSIZE 9 + /* Block size of any entity covered/uncovered with a KEK/TKEK */ #define KEK_BLOCKSIZE 16 + /* * Supported descriptor command types as they show up * inside a descriptor command word. @@ -272,6 +279,13 @@ #define LDLEN_SET_OFIFO_OFFSET_SHIFT 0 #define LDLEN_SET_OFIFO_OFFSET_MASK (3 << LDLEN_SET_OFIFO_OFFSET_SHIFT) +/* + * AAD Definitions + */ +#define AES_KEY_SHIFT 8 +#define LD_CCM_MODE 0x66 +#define KEY_AES_SRC (0x55 << AES_KEY_SHIFT) + /* * FIFO_LOAD/FIFO_STORE/SEQ_FIFO_LOAD/SEQ_FIFO_STORE * Command Constructs @@ -418,6 +432,7 @@ #define OP_PCLID_MASK (0xff << 16) /* Assuming OP_TYPE = OP_TYPE_UNI_PROTOCOL */ +#define OP_PCLID_SECMEM 0x08 #define OP_PCLID_BLOB (0x0d << OP_PCLID_SHIFT) #define OP_PCLID_SECRETKEY (0x11 << OP_PCLID_SHIFT) #define OP_PCLID_PUBLICKEYPAIR (0x14 << OP_PCLID_SHIFT) diff --git a/drivers/crypto/fsl/fsl_blob.c b/drivers/crypto/fsl/fsl_blob.c index 9923bcbfe9..8b25921272 100644 --- a/drivers/crypto/fsl/fsl_blob.c +++ b/drivers/crypto/fsl/fsl_blob.c @@ -7,6 +7,8 @@ #include #include +#include +#include #include "jobdesc.h" #include "desc.h" #include "jr.h" @@ -59,3 +61,53 @@ int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len) free(desc); return ret; } + +#ifdef CONFIG_CMD_DEKBLOB +int blob_dek(const u8 *src, u8 *dst, u8 len) +{ + int ret, size, i = 0; + u32 *desc; + + int out_sz = WRP_HDR_SIZE + len + KEY_BLOB_SIZE + MAC_SIZE; + + puts("\nEncapsulating provided DEK to form blob\n"); + desc = memalign(ARCH_DMA_MINALIGN, + sizeof(uint32_t) * DEK_BLOB_DESCSIZE); + if (!desc) { + debug("Not enough memory for descriptor allocation\n"); + return -ENOMEM; + } + + ret = inline_cnstr_jobdesc_blob_dek(desc, src, dst, len); + if (ret) { + debug("Error in Job Descriptor Construction: %d\n", ret); + } else { + size = roundup(sizeof(uint32_t) * DEK_BLOB_DESCSIZE, + ARCH_DMA_MINALIGN); + flush_dcache_range((unsigned long)desc, + (unsigned long)desc + size); + size = roundup(sizeof(uint8_t) * out_sz, ARCH_DMA_MINALIGN); + flush_dcache_range((unsigned long)dst, + (unsigned long)dst + size); + + ret = run_descriptor_jr(desc); + } + + if (ret) { + debug("Error in Encapsulation %d\n", ret); + goto err; + } + + size = roundup(out_sz, ARCH_DMA_MINALIGN); + invalidate_dcache_range((unsigned long)dst, (unsigned long)dst+size); + + puts("DEK Blob\n"); + for (i = 0; i < out_sz; i++) + printf("%02X", ((uint8_t *)dst)[i]); + printf("\n"); + +err: + free(desc); + return ret; +} +#endif diff --git a/drivers/crypto/fsl/jobdesc.c b/drivers/crypto/fsl/jobdesc.c index cc0dcede7b..5695bef6fd 100644 --- a/drivers/crypto/fsl/jobdesc.c +++ b/drivers/crypto/fsl/jobdesc.c @@ -9,12 +9,157 @@ */ #include +#include #include "desc_constr.h" #include "jobdesc.h" #include "rsa_caam.h" -#define KEY_BLOB_SIZE 32 -#define MAC_SIZE 16 +#ifdef CONFIG_MX6 +/*! + * Secure memory run command + * + * @param sec_mem_cmd Secure memory command register + * @return cmd_status Secure memory command status register + */ +uint32_t secmem_set_cmd(uint32_t sec_mem_cmd) +{ + uint32_t temp_reg; + + sec_out32(CAAM_SMCJR0, sec_mem_cmd); + + do { + temp_reg = sec_in32(CAAM_SMCSJR0); + } while (temp_reg & CMD_COMPLETE); + + return temp_reg; +} + +/*! + * CAAM page allocation: + * Allocates a partition from secure memory, with the id + * equal to partion_num. This will de-allocate the page + * if it is already allocated. The partition will have + * full access permissions. The permissions are set before, + * running a job descriptor. A memory page of secure RAM + * is allocated for the partition. + * + * @param page Number of the page to allocate. + * @param partition Number of the partition to allocate. + * @return 0 on success, ERROR_IN_PAGE_ALLOC otherwise + */ +int caam_page_alloc(uint8_t page_num, uint8_t partition_num) +{ + uint32_t temp_reg; + + /* + * De-Allocate partition_num if already allocated to ARM core + */ + if (sec_in32(CAAM_SMPO_0) & PARTITION_OWNER(partition_num)) { + temp_reg = secmem_set_cmd(PARTITION(partition_num) | + CMD_PART_DEALLOC); + if (temp_reg & SMCSJR_AERR) { + printf("Error: De-allocation status 0x%X\n", temp_reg); + return ERROR_IN_PAGE_ALLOC; + } + } + + /* set the access rights to allow full access */ + sec_out32(CAAM_SMAG1JR0(partition_num), 0xF); + sec_out32(CAAM_SMAG2JR0(partition_num), 0xF); + sec_out32(CAAM_SMAPJR0(partition_num), 0xFF); + + /* Now need to allocate partition_num of secure RAM. */ + /* De-Allocate page_num by starting with a page inquiry command */ + temp_reg = secmem_set_cmd(PAGE(page_num) | CMD_INQUIRY); + + /* if the page is owned, de-allocate it */ + if ((temp_reg & SMCSJR_PO) == PAGE_OWNED) { + temp_reg = secmem_set_cmd(PAGE(page_num) | CMD_PAGE_DEALLOC); + if (temp_reg & SMCSJR_AERR) { + printf("Error: Allocation status 0x%X\n", temp_reg); + return ERROR_IN_PAGE_ALLOC; + } + } + + /* Allocate page_num to partition_num */ + temp_reg = secmem_set_cmd(PAGE(page_num) | PARTITION(partition_num) + | CMD_PAGE_ALLOC); + if (temp_reg & SMCSJR_AERR) { + printf("Error: Allocation status 0x%X\n", temp_reg); + return ERROR_IN_PAGE_ALLOC; + } + /* page inquiry command to ensure that the page was allocated */ + temp_reg = secmem_set_cmd(PAGE(page_num) | CMD_INQUIRY); + + /* if the page is not owned => problem */ + if ((temp_reg & SMCSJR_PO) != PAGE_OWNED) { + printf("Allocation of page %d in partition %d failed 0x%X\n", + temp_reg, page_num, partition_num); + + return ERROR_IN_PAGE_ALLOC; + } + + return 0; +} + +int inline_cnstr_jobdesc_blob_dek(uint32_t *desc, const uint8_t *plain_txt, + uint8_t *dek_blob, uint32_t in_sz) +{ + uint32_t ret = 0; + u32 aad_w1, aad_w2; + /* output blob will have 32 bytes key blob in beginning and + * 16 byte HMAC identifier at end of data blob */ + uint32_t out_sz = in_sz + KEY_BLOB_SIZE + MAC_SIZE; + /* Setting HDR for blob */ + uint8_t wrapped_key_hdr[8] = {HDR_TAG, 0x00, WRP_HDR_SIZE + out_sz, + HDR_PAR, HAB_MOD, HAB_ALG, in_sz, HAB_FLG}; + + /* initialize the blob array */ + memset(dek_blob, 0, out_sz + 8); + /* Copy the header into the DEK blob buffer */ + memcpy(dek_blob, wrapped_key_hdr, sizeof(wrapped_key_hdr)); + + /* allocating secure memory */ + ret = caam_page_alloc(PAGE_1, PARTITION_1); + if (ret) + return ret; + + /* Write DEK to secure memory */ + memcpy((uint32_t *)SEC_MEM_PAGE1, (uint32_t *)plain_txt, in_sz); + + unsigned long start = (unsigned long)SEC_MEM_PAGE1 & + ~(ARCH_DMA_MINALIGN - 1); + unsigned long end = ALIGN(start + 0x1000, ARCH_DMA_MINALIGN); + flush_dcache_range(start, end); + + /* Now configure the access rights of the partition */ + sec_out32(CAAM_SMAG1JR0(PARTITION_1), KS_G1); /* set group 1 */ + sec_out32(CAAM_SMAG2JR0(PARTITION_1), 0); /* clear group 2 */ + sec_out32(CAAM_SMAPJR0(PARTITION_1), PERM); /* set perm & locks */ + + /* construct aad for AES */ + aad_w1 = (in_sz << OP_ALG_ALGSEL_SHIFT) | KEY_AES_SRC | LD_CCM_MODE; + aad_w2 = 0x0; + + init_job_desc(desc, 0); + + append_cmd(desc, CMD_LOAD | CLASS_2 | KEY_IMM | KEY_ENC | + (0x0c << LDST_OFFSET_SHIFT) | 0x08); + + append_u32(desc, aad_w1); + + append_u32(desc, aad_w2); + + append_cmd_ptr(desc, (dma_addr_t)SEC_MEM_PAGE1, in_sz, CMD_SEQ_IN_PTR); + + append_cmd_ptr(desc, (dma_addr_t)dek_blob + 8, out_sz, CMD_SEQ_OUT_PTR); + + append_operation(desc, OP_TYPE_ENCAP_PROTOCOL | OP_PCLID_BLOB | + OP_PCLID_SECMEM); + + return ret; +} +#endif void inline_cnstr_jobdesc_hash(uint32_t *desc, const uint8_t *msg, uint32_t msgsz, uint8_t *digest, diff --git a/drivers/crypto/fsl/jobdesc.h b/drivers/crypto/fsl/jobdesc.h index 84b3edd6e2..112404c74d 100644 --- a/drivers/crypto/fsl/jobdesc.h +++ b/drivers/crypto/fsl/jobdesc.h @@ -14,6 +14,20 @@ #define KEY_IDNFR_SZ_BYTES 16 +#ifdef CONFIG_CMD_DEKBLOB +/* inline_cnstr_jobdesc_blob_dek: + * Intializes and constructs the job descriptor for DEK encapsulation + * using the given parameters. + * @desc: reference to the job descriptor + * @plain_txt: reference to the DEK + * @enc_blob: reference where to store the blob + * @in_sz: size in bytes of the DEK + * @return: 0 on success, ECONSTRJDESC otherwise + */ +int inline_cnstr_jobdesc_blob_dek(uint32_t *desc, const uint8_t *plain_txt, + uint8_t *enc_blob, uint32_t in_sz); +#endif + void inline_cnstr_jobdesc_hash(uint32_t *desc, const uint8_t *msg, uint32_t msgsz, uint8_t *digest, u32 alg_type, uint32_t alg_size, int sg_tbl); diff --git a/drivers/crypto/fsl/jr.c b/drivers/crypto/fsl/jr.c index f9d4938834..f99d59480c 100644 --- a/drivers/crypto/fsl/jr.c +++ b/drivers/crypto/fsl/jr.c @@ -90,11 +90,13 @@ static int jr_init(void) jr.liodn = DEFAULT_JR_LIODN; #endif jr.size = JR_SIZE; - jr.input_ring = (dma_addr_t *)malloc(JR_SIZE * sizeof(dma_addr_t)); + jr.input_ring = (dma_addr_t *)memalign(ARCH_DMA_MINALIGN, + JR_SIZE * sizeof(dma_addr_t)); if (!jr.input_ring) return -1; jr.output_ring = - (struct op_ring *)malloc(JR_SIZE * sizeof(struct op_ring)); + (struct op_ring *)memalign(ARCH_DMA_MINALIGN, + JR_SIZE * sizeof(struct op_ring)); if (!jr.output_ring) return -1; @@ -163,13 +165,23 @@ static int jr_enqueue(uint32_t *desc_addr, CIRC_SPACE(jr.head, jr.tail, jr.size) <= 0) return -1; - jr.input_ring[head] = desc_phys_addr; jr.info[head].desc_phys_addr = desc_phys_addr; jr.info[head].desc_addr = (uint32_t)desc_addr; jr.info[head].callback = (void *)callback; jr.info[head].arg = arg; jr.info[head].op_done = 0; + unsigned long start = (unsigned long)&jr.info[head] & + ~(ARCH_DMA_MINALIGN - 1); + unsigned long end = ALIGN(start + sizeof(struct jr_info), + ARCH_DMA_MINALIGN); + flush_dcache_range(start, end); + + jr.input_ring[head] = desc_phys_addr; + start = (unsigned long)&jr.input_ring[head] & ~(ARCH_DMA_MINALIGN - 1); + end = ALIGN(start + sizeof(dma_addr_t), ARCH_DMA_MINALIGN); + flush_dcache_range(start, end); + jr.head = (head + 1) & (jr.size - 1); sec_out32(®s->irja, 1); @@ -187,6 +199,13 @@ static int jr_dequeue(void) void *arg = NULL; while (sec_in32(®s->orsf) && CIRC_CNT(jr.head, jr.tail, jr.size)) { + unsigned long start = (unsigned long)jr.output_ring & + ~(ARCH_DMA_MINALIGN - 1); + unsigned long end = ALIGN(start + + sizeof(struct op_ring)*JR_SIZE, + ARCH_DMA_MINALIGN); + invalidate_dcache_range(start, end); + found = 0; dma_addr_t op_desc = jr.output_ring[jr.tail].desc; @@ -333,13 +352,17 @@ static int instantiate_rng(void) memset(&op, 0, sizeof(struct result)); - desc = malloc(sizeof(int) * 6); + desc = memalign(ARCH_DMA_MINALIGN, sizeof(uint32_t) * 6); if (!desc) { printf("cannot allocate RNG init descriptor memory\n"); return -1; } inline_cnstr_jobdesc_rng_instantiation(desc); + int size = roundup(sizeof(uint32_t) * 6, ARCH_DMA_MINALIGN); + flush_dcache_range((unsigned long)desc, + (unsigned long)desc + size); + ret = run_descriptor_jr(desc); if (ret) -- cgit v1.2.1