diff options
Diffstat (limited to 'drivers/crypto/ccp/ccp-ops.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-ops.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c index 0d820802cd92..0de961a22ab4 100644 --- a/drivers/crypto/ccp/ccp-ops.c +++ b/drivers/crypto/ccp/ccp-ops.c @@ -16,6 +16,7 @@ #include <linux/pci.h> #include <linux/interrupt.h> #include <crypto/scatterwalk.h> +#include <crypto/des.h> #include <linux/ccp.h> #include "ccp-dev.h" @@ -939,6 +940,200 @@ e_key: return ret; } +static int ccp_run_des3_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd) +{ + struct ccp_des3_engine *des3 = &cmd->u.des3; + + struct ccp_dm_workarea key, ctx; + struct ccp_data src, dst; + struct ccp_op op; + unsigned int dm_offset; + unsigned int len_singlekey; + bool in_place = false; + int ret; + + /* Error checks */ + if (!cmd_q->ccp->vdata->perform->des3) + return -EINVAL; + + if (des3->key_len != DES3_EDE_KEY_SIZE) + return -EINVAL; + + if (((des3->mode == CCP_DES3_MODE_ECB) || + (des3->mode == CCP_DES3_MODE_CBC)) && + (des3->src_len & (DES3_EDE_BLOCK_SIZE - 1))) + return -EINVAL; + + if (!des3->key || !des3->src || !des3->dst) + return -EINVAL; + + if (des3->mode != CCP_DES3_MODE_ECB) { + if (des3->iv_len != DES3_EDE_BLOCK_SIZE) + return -EINVAL; + + if (!des3->iv) + return -EINVAL; + } + + ret = -EIO; + /* Zero out all the fields of the command desc */ + memset(&op, 0, sizeof(op)); + + /* Set up the Function field */ + op.cmd_q = cmd_q; + op.jobid = CCP_NEW_JOBID(cmd_q->ccp); + op.sb_key = cmd_q->sb_key; + + op.init = (des3->mode == CCP_DES3_MODE_ECB) ? 0 : 1; + op.u.des3.type = des3->type; + op.u.des3.mode = des3->mode; + op.u.des3.action = des3->action; + + /* + * All supported key sizes fit in a single (32-byte) KSB entry and + * (like AES) must be in little endian format. Use the 256-bit byte + * swap passthru option to convert from big endian to little endian. + */ + ret = ccp_init_dm_workarea(&key, cmd_q, + CCP_DES3_KEY_SB_COUNT * CCP_SB_BYTES, + DMA_TO_DEVICE); + if (ret) + return ret; + + /* + * The contents of the key triplet are in the reverse order of what + * is required by the engine. Copy the 3 pieces individually to put + * them where they belong. + */ + dm_offset = CCP_SB_BYTES - des3->key_len; /* Basic offset */ + + len_singlekey = des3->key_len / 3; + ccp_set_dm_area(&key, dm_offset + 2 * len_singlekey, + des3->key, 0, len_singlekey); + ccp_set_dm_area(&key, dm_offset + len_singlekey, + des3->key, len_singlekey, len_singlekey); + ccp_set_dm_area(&key, dm_offset, + des3->key, 2 * len_singlekey, len_singlekey); + + /* Copy the key to the SB */ + ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key, + CCP_PASSTHRU_BYTESWAP_256BIT); + if (ret) { + cmd->engine_error = cmd_q->cmd_error; + goto e_key; + } + + /* + * The DES3 context fits in a single (32-byte) KSB entry and + * must be in little endian format. Use the 256-bit byte swap + * passthru option to convert from big endian to little endian. + */ + if (des3->mode != CCP_DES3_MODE_ECB) { + u32 load_mode; + + op.sb_ctx = cmd_q->sb_ctx; + + ret = ccp_init_dm_workarea(&ctx, cmd_q, + CCP_DES3_CTX_SB_COUNT * CCP_SB_BYTES, + DMA_BIDIRECTIONAL); + if (ret) + goto e_key; + + /* Load the context into the LSB */ + dm_offset = CCP_SB_BYTES - des3->iv_len; + ccp_set_dm_area(&ctx, dm_offset, des3->iv, 0, des3->iv_len); + + if (cmd_q->ccp->vdata->version == CCP_VERSION(3, 0)) + load_mode = CCP_PASSTHRU_BYTESWAP_NOOP; + else + load_mode = CCP_PASSTHRU_BYTESWAP_256BIT; + ret = ccp_copy_to_sb(cmd_q, &ctx, op.jobid, op.sb_ctx, + load_mode); + if (ret) { + cmd->engine_error = cmd_q->cmd_error; + goto e_ctx; + } + } + + /* + * Prepare the input and output data workareas. For in-place + * operations we need to set the dma direction to BIDIRECTIONAL + * and copy the src workarea to the dst workarea. + */ + if (sg_virt(des3->src) == sg_virt(des3->dst)) + in_place = true; + + ret = ccp_init_data(&src, cmd_q, des3->src, des3->src_len, + DES3_EDE_BLOCK_SIZE, + in_place ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE); + if (ret) + goto e_ctx; + + if (in_place) + dst = src; + else { + ret = ccp_init_data(&dst, cmd_q, des3->dst, des3->src_len, + DES3_EDE_BLOCK_SIZE, DMA_FROM_DEVICE); + if (ret) + goto e_src; + } + + /* Send data to the CCP DES3 engine */ + while (src.sg_wa.bytes_left) { + ccp_prepare_data(&src, &dst, &op, DES3_EDE_BLOCK_SIZE, true); + if (!src.sg_wa.bytes_left) { + op.eom = 1; + + /* Since we don't retrieve the context in ECB mode + * we have to wait for the operation to complete + * on the last piece of data + */ + op.soc = 0; + } + + ret = cmd_q->ccp->vdata->perform->des3(&op); + if (ret) { + cmd->engine_error = cmd_q->cmd_error; + goto e_dst; + } + + ccp_process_data(&src, &dst, &op); + } + + if (des3->mode != CCP_DES3_MODE_ECB) { + /* Retrieve the context and make BE */ + ret = ccp_copy_from_sb(cmd_q, &ctx, op.jobid, op.sb_ctx, + CCP_PASSTHRU_BYTESWAP_256BIT); + if (ret) { + cmd->engine_error = cmd_q->cmd_error; + goto e_dst; + } + + /* ...but we only need the last DES3_EDE_BLOCK_SIZE bytes */ + if (cmd_q->ccp->vdata->version == CCP_VERSION(3, 0)) + dm_offset = CCP_SB_BYTES - des3->iv_len; + else + dm_offset = 0; + ccp_get_dm_area(&ctx, dm_offset, des3->iv, 0, + DES3_EDE_BLOCK_SIZE); + } +e_dst: + if (!in_place) + ccp_free_data(&dst, cmd_q); + +e_src: + ccp_free_data(&src, cmd_q); + +e_ctx: + if (des3->mode != CCP_DES3_MODE_ECB) + ccp_dm_free(&ctx); + +e_key: + ccp_dm_free(&key); + + return ret; +} + static int ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd) { struct ccp_sha_engine *sha = &cmd->u.sha; @@ -1903,6 +2098,9 @@ int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd) case CCP_ENGINE_XTS_AES_128: ret = ccp_run_xts_aes_cmd(cmd_q, cmd); break; + case CCP_ENGINE_DES3: + ret = ccp_run_des3_cmd(cmd_q, cmd); + break; case CCP_ENGINE_SHA: ret = ccp_run_sha_cmd(cmd_q, cmd); break; |