crypto/fsl - Add progressive hashing support using hardware acceleration.

[karo-tx-uboot.git] / drivers / crypto / fsl / fsl_hash.c

diff --git a/drivers/crypto/fsl/fsl_hash.c b/drivers/crypto/fsl/fsl_hash.c
index d77f2573d0f6e6a1cbbfe37d6ebe68c449043e98..c298404f2526a1a448f3cc4098b287ee49513506 100644 (file)
--- a/drivers/crypto/fsl/fsl_hash.c
+++ b/drivers/crypto/fsl/fsl_hash.c
@@ -10,6 +10,9 @@
 #include "jobdesc.h"
 #include "desc.h"
 #include "jr.h"
+#include "fsl_hash.h"
+#include <hw_sha.h>
+#include <asm-generic/errno.h>
 
 #define CRYPTO_MAX_ALG_NAME    80
 #define SHA1_DIGEST_SIZE        20
@@ -39,6 +42,122 @@ static struct caam_hash_template driver_hash[] = {
        },
 };
 
+static enum caam_hash_algos get_hash_type(struct hash_algo *algo)
+{
+       if (!strcmp(algo->name, driver_hash[SHA1].name))
+               return SHA1;
+       else
+               return SHA256;
+}
+
+/* Create the context for progressive hashing using h/w acceleration.
+ *
+ * @ctxp: Pointer to the pointer of the context for hashing
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -ENOMEM on error
+ */
+static int caam_hash_init(void **ctxp, enum caam_hash_algos caam_algo)
+{
+       *ctxp = calloc(1, sizeof(struct sha_ctx));
+       if (*ctxp == NULL) {
+               debug("Cannot allocate memory for context\n");
+               return -ENOMEM;
+       }
+       return 0;
+}
+
+/*
+ * Update sg table for progressive hashing using h/w acceleration
+ *
+ * The context is freed by this function if an error occurs.
+ * We support at most 32 Scatter/Gather Entries.
+ *
+ * @hash_ctx: Pointer to the context for hashing
+ * @buf: Pointer to the buffer being hashed
+ * @size: Size of the buffer being hashed
+ * @is_last: 1 if this is the last update; 0 otherwise
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -EINVAL on error
+ */
+static int caam_hash_update(void *hash_ctx, const void *buf,
+                           unsigned int size, int is_last,
+                           enum caam_hash_algos caam_algo)
+{
+       uint32_t final = 0;
+       dma_addr_t addr = virt_to_phys((void *)buf);
+       struct sha_ctx *ctx = hash_ctx;
+
+       if (ctx->sg_num >= MAX_SG_32) {
+               free(ctx);
+               return -EINVAL;
+       }
+
+#ifdef CONFIG_PHYS_64BIT
+       ctx->sg_tbl[ctx->sg_num].addr_hi = addr >> 32;
+#else
+       ctx->sg_tbl[ctx->sg_num].addr_hi = 0x0;
+#endif
+       ctx->sg_tbl[ctx->sg_num].addr_lo = addr;
+
+       sec_out32(&ctx->sg_tbl[ctx->sg_num].len_flag,
+                 (size & SG_ENTRY_LENGTH_MASK));
+
+       ctx->sg_num++;
+
+       if (is_last) {
+               final = sec_in32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag) |
+                       SG_ENTRY_FINAL_BIT;
+               sec_out32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag, final);
+       }
+
+       return 0;
+}
+
+/*
+ * Perform progressive hashing on the given buffer and copy hash at
+ * destination buffer
+ *
+ * The context is freed after completion of hash operation.
+ *
+ * @hash_ctx: Pointer to the context for hashing
+ * @dest_buf: Pointer to the destination buffer where hash is to be copied
+ * @size: Size of the buffer being hashed
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -EINVAL on error
+ */
+static int caam_hash_finish(void *hash_ctx, void *dest_buf,
+                           int size, enum caam_hash_algos caam_algo)
+{
+       uint32_t len = 0;
+       struct sha_ctx *ctx = hash_ctx;
+       int i = 0, ret = 0;
+
+       if (size < driver_hash[caam_algo].digestsize) {
+               free(ctx);
+               return -EINVAL;
+       }
+
+       for (i = 0; i < ctx->sg_num; i++)
+               len += (sec_in32(&ctx->sg_tbl[i].len_flag) &
+                       SG_ENTRY_LENGTH_MASK);
+
+       inline_cnstr_jobdesc_hash(ctx->sha_desc, (uint8_t *)ctx->sg_tbl, len,
+                                 ctx->hash,
+                                 driver_hash[caam_algo].alg_type,
+                                 driver_hash[caam_algo].digestsize,
+                                 1);
+
+       ret = run_descriptor_jr(ctx->sha_desc);
+
+       if (ret)
+               debug("Error %x\n", ret);
+       else
+               memcpy(dest_buf, ctx->hash, sizeof(ctx->hash));
+
+       free(ctx);
+       return ret;
+}
+
 int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
              unsigned char *pout, enum caam_hash_algos algo)
 {
@@ -48,7 +167,7 @@ int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
        desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
        if (!desc) {
                debug("Not enough memory for descriptor allocation\n");
-               return -1;
+               return -ENOMEM;
        }
 
        inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
@@ -75,3 +194,20 @@ void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
        if (caam_hash(pbuf, buf_len, pout, SHA1))
                printf("CAAM was not setup properly or it is faulty\n");
 }
+
+int hw_sha_init(struct hash_algo *algo, void **ctxp)
+{
+       return caam_hash_init(ctxp, get_hash_type(algo));
+}
+
+int hw_sha_update(struct hash_algo *algo, void *ctx, const void *buf,
+                           unsigned int size, int is_last)
+{
+       return caam_hash_update(ctx, buf, size, is_last, get_hash_type(algo));
+}
+
+int hw_sha_finish(struct hash_algo *algo, void *ctx, void *dest_buf,
+                    int size)
+{
+       return caam_hash_finish(ctx, dest_buf, size, get_hash_type(algo));
+}