diff options
Diffstat (limited to 'drivers/crypto/caam/key_gen.c')
| -rw-r--r-- | drivers/crypto/caam/key_gen.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c new file mode 100644 index 0000000000..88cc4fe2a5 --- /dev/null +++ b/drivers/crypto/caam/key_gen.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CAAM/SEC 4.x functions for handling key-generation jobs + * + * Copyright 2008-2011 Freescale Semiconductor, Inc. + * + */ +#include "compat.h" +#include "jr.h" +#include "error.h" +#include "desc_constr.h" +#include "key_gen.h" + +void split_key_done(struct device *dev, u32 *desc, u32 err, + void *context) +{ + struct split_key_result *res = context; + int ecode = 0; + + dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err); + + if (err) + ecode = caam_jr_strstatus(dev, err); + + res->err = ecode; + + complete(&res->completion); +} +EXPORT_SYMBOL(split_key_done); +/* +get a split ipad/opad key + +Split key generation----------------------------------------------- + +[00] 0xb0810008 jobdesc: stidx=1 share=never len=8 +[01] 0x04000014 key: class2->keyreg len=20 + @0xffe01000 +[03] 0x84410014 operation: cls2-op sha1 hmac init dec +[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm +[05] 0xa4000001 jump: class2 local all ->1 [06] +[06] 0x64260028 fifostr: class2 mdsplit-jdk len=40 + @0xffe04000 +*/ +int gen_split_key(struct device *jrdev, u8 *key_out, + struct alginfo * const adata, const u8 *key_in, u32 keylen, + int max_keylen) +{ + u32 *desc; + struct split_key_result result; + dma_addr_t dma_addr; + unsigned int local_max; + int ret = -ENOMEM; + + adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK); + adata->keylen_pad = split_key_pad_len(adata->algtype & + OP_ALG_ALGSEL_MASK); + local_max = max(keylen, adata->keylen_pad); + + dev_dbg(jrdev, "split keylen %d split keylen padded %d\n", + adata->keylen, adata->keylen_pad); + print_hex_dump_debug("ctx.key@" __stringify(__LINE__)": ", + DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1); + + if (local_max > max_keylen) + return -EINVAL; + + desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL); + if (!desc) { + dev_err(jrdev, "unable to allocate key input memory\n"); + return ret; + } + + memcpy(key_out, key_in, keylen); + + dma_addr = dma_map_single(jrdev, key_out, local_max, DMA_BIDIRECTIONAL); + if (dma_mapping_error(jrdev, dma_addr)) { + dev_err(jrdev, "unable to map key memory\n"); + goto out_free; + } + + init_job_desc(desc, 0); + append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG); + + /* Sets MDHA up into an HMAC-INIT */ + append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) | + OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT | + OP_ALG_AS_INIT); + + /* + * do a FIFO_LOAD of zero, this will trigger the internal key expansion + * into both pads inside MDHA + */ + append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB | + FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2); + + /* + * FIFO_STORE with the explicit split-key content store + * (0x26 output type) + */ + append_fifo_store(desc, dma_addr, adata->keylen, + LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); + + print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ", + DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), + 1); + + result.err = 0; + init_completion(&result.completion); + + ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result); + if (ret == -EINPROGRESS) { + /* in progress */ + wait_for_completion(&result.completion); + ret = result.err; + + print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ", + DUMP_PREFIX_ADDRESS, 16, 4, key_out, + adata->keylen_pad, 1); + } + + dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL); +out_free: + kfree(desc); + return ret; +} +EXPORT_SYMBOL(gen_split_key); |