crypto: caam - add support for xcbc(aes)

[mirror_ubuntu-hirsute-kernel.git] / drivers / crypto / caam / caamhash_desc.c

diff --git a/drivers/crypto/caam/caamhash_desc.c b/drivers/crypto/caam/caamhash_desc.c
index a12f7959a2c3ae9a188dcd8feca8f6062062bec5..053d3a15ef3cb2f454b14d75f3fb9d080b35513e 100644 (file)
--- a/drivers/crypto/caam/caamhash_desc.c
+++ b/drivers/crypto/caam/caamhash_desc.c
@@ -2,7 +2,7 @@
 /*
  * Shared descriptors for ahash algorithms
  *
- * Copyright 2017 NXP
+ * Copyright 2017-2018 NXP
  */
 
 #include "compat.h"
@@ -75,6 +75,62 @@ void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
 }
 EXPORT_SYMBOL(cnstr_shdsc_ahash);
 
+/**
+ * cnstr_shdsc_axcbc - axcbc shared descriptor
+ * @desc: pointer to buffer used for descriptor construction
+ * @adata: pointer to authentication transform definitions.
+ * @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
+ * @digestsize: algorithm's digest size
+ * @ctx_len: size of Context Register
+ * @key_dma: I/O Virtual Address of the key
+ */
+void cnstr_shdsc_axcbc(u32 * const desc, struct alginfo *adata, u32 state,
+                      int digestsize, int ctx_len, dma_addr_t key_dma)
+{
+       u32 *skip_key_load;
+
+       init_sh_desc(desc, HDR_SHARE_SERIAL | HDR_SAVECTX);
+
+       /* Skip loading of key, context if already shared */
+       skip_key_load = append_jump(desc, JUMP_TEST_ALL | JUMP_COND_SHRD);
+
+       if (state == OP_ALG_AS_INIT || state == OP_ALG_AS_INITFINAL) {
+               append_key_as_imm(desc, adata->key_virt, adata->keylen,
+                                 adata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
+       } else { /* UPDATE, FINALIZE */
+               /* Load K1 */
+               append_key(desc, adata->key_dma, adata->keylen,
+                          CLASS_1 | KEY_DEST_CLASS_REG | KEY_ENC);
+               /* Restore context */
+               append_seq_load(desc, ctx_len, LDST_CLASS_1_CCB |
+                               LDST_SRCDST_BYTE_CONTEXT);
+       }
+
+       set_jump_tgt_here(desc, skip_key_load);
+
+       /* Class 1 operation */
+       append_operation(desc, adata->algtype | state | OP_ALG_ENCRYPT);
+
+       /*
+        * Load from buf and/or src and write to req->result or state->context
+        * Calculate remaining bytes to read
+        */
+       append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
+
+       /* Read remaining bytes */
+       append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_LAST1 |
+                            FIFOLD_TYPE_MSG | FIFOLDST_VLF);
+
+       /* Save context (partial hash, K2, K3) */
+       append_seq_store(desc, digestsize, LDST_CLASS_1_CCB |
+                        LDST_SRCDST_BYTE_CONTEXT);
+       if (state == OP_ALG_AS_INIT)
+               /* Save K1 */
+               append_fifo_store(desc, key_dma, adata->keylen,
+                                 LDST_CLASS_1_CCB | FIFOST_TYPE_KEY_KEK);
+}
+EXPORT_SYMBOL(cnstr_shdsc_axcbc);
+
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("FSL CAAM ahash descriptors support");
 MODULE_AUTHOR("NXP Semiconductors");