[mirror_ubuntu-artful-kernel.git] / drivers / crypto / caam / key_gen.c

/*
 * 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"

/**
 * split_key_len - Compute MDHA split key length for a given algorithm
 * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
 *        SHA224, SHA384, SHA512.
 *
 * Return: MDHA split key length
 */
static inline u32 split_key_len(u32 hash)
{
	/* Sizes for MDHA pads (*not* keys): MD5, SHA1, 224, 256, 384, 512 */
	static const u8 mdpadlen[] = { 16, 20, 32, 32, 64, 64 };
	u32 idx;

	idx = (hash & OP_ALG_ALGSEL_SUBMASK) >> OP_ALG_ALGSEL_SHIFT;

	return (u32)(mdpadlen[idx] * 2);
}

/**
 * split_key_pad_len - Compute MDHA split key pad length for a given algorithm
 * @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
 *        SHA224, SHA384, SHA512.
 *
 * Return: MDHA split key pad length
 */
static inline u32 split_key_pad_len(u32 hash)
{
	return ALIGN(split_key_len(hash), 16);
}

void split_key_done(struct device *dev, u32 *desc, u32 err,
			   void *context)
{
	struct split_key_result *res = context;

#ifdef DEBUG
	dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
#endif

	if (err)
		caam_jr_strstatus(dev, err);

	res->err = err;

	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_in, dma_addr_out;
	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);

#ifdef DEBUG
	dev_err(jrdev, "split keylen %d split keylen padded %d\n",
		adata->keylen, adata->keylen_pad);
	print_hex_dump(KERN_ERR, "ctx.key@" __stringify(__LINE__)": ",
		       DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
#endif

	if (adata->keylen_pad > max_keylen)
		return -EINVAL;

	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
	if (!desc) {
		dev_err(jrdev, "unable to allocate key input memory\n");
		return ret;
	}

	dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
				     DMA_TO_DEVICE);
	if (dma_mapping_error(jrdev, dma_addr_in)) {
		dev_err(jrdev, "unable to map key input memory\n");
		goto out_free;
	}

	dma_addr_out = dma_map_single(jrdev, key_out, adata->keylen_pad,
				      DMA_FROM_DEVICE);
	if (dma_mapping_error(jrdev, dma_addr_out)) {
		dev_err(jrdev, "unable to map key output memory\n");
		goto out_unmap_in;
	}

	init_job_desc(desc, 0);
	append_key(desc, dma_addr_in, 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_out, adata->keylen,
			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);

#ifdef DEBUG
	print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
		       DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
	print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
		       DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
#endif

	result.err = 0;
	init_completion(&result.completion);

	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
	if (!ret) {
		/* in progress */
		wait_for_completion(&result.completion);
		ret = result.err;
#ifdef DEBUG
		print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
			       DUMP_PREFIX_ADDRESS, 16, 4, key_out,
			       adata->keylen_pad, 1);
#endif
	}

	dma_unmap_single(jrdev, dma_addr_out, adata->keylen_pad,
			 DMA_FROM_DEVICE);
out_unmap_in:
	dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
out_free:
	kfree(desc);
	return ret;
}
EXPORT_SYMBOL(gen_split_key);
Commit	Line	Data
4c1ec1f9 YK	1	/*
	2	* CAAM/SEC 4.x functions for handling key-generation jobs
	3	*
	4	* Copyright 2008-2011 Freescale Semiconductor, Inc.
	5	*
	6	*/
	7	#include "compat.h"
	8	#include "jr.h"
	9	#include "error.h"
	10	#include "desc_constr.h"
	11	#include "key_gen.h"
	12
6655cb8e HG	13	/**
	14	* split_key_len - Compute MDHA split key length for a given algorithm
	15	* @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
	16	* SHA224, SHA384, SHA512.
	17	*
	18	* Return: MDHA split key length
	19	*/
	20	static inline u32 split_key_len(u32 hash)
	21	{
	22	/* Sizes for MDHA pads (not keys): MD5, SHA1, 224, 256, 384, 512 */
	23	static const u8 mdpadlen[] = { 16, 20, 32, 32, 64, 64 };
	24	u32 idx;
	25
	26	idx = (hash & OP_ALG_ALGSEL_SUBMASK) >> OP_ALG_ALGSEL_SHIFT;
	27
	28	return (u32)(mdpadlen[idx] * 2);
	29	}
	30
	31	/**
	32	* split_key_pad_len - Compute MDHA split key pad length for a given algorithm
	33	* @hash: Hashing algorithm selection, one of OP_ALG_ALGSEL_* - MD5, SHA1,
	34	* SHA224, SHA384, SHA512.
	35	*
	36	* Return: MDHA split key pad length
	37	*/
	38	static inline u32 split_key_pad_len(u32 hash)
	39	{
	40	return ALIGN(split_key_len(hash), 16);
	41	}
	42
4c1ec1f9 YK	43	void split_key_done(struct device dev, u32 desc, u32 err,
	44	void *context)
	45	{
	46	struct split_key_result *res = context;
	47
	48	#ifdef DEBUG
	49	dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
	50	#endif
	51
fa9659cd MV	52	if (err)
fa9659cd MV	53	caam_jr_strstatus(dev, err);
4c1ec1f9 YK	54
	55	res->err = err;
	56
	57	complete(&res->completion);
	58	}
	59	EXPORT_SYMBOL(split_key_done);
	60	/*
	61	get a split ipad/opad key
	62
	63	Split key generation-----------------------------------------------
	64
	65	[00] 0xb0810008 jobdesc: stidx=1 share=never len=8
	66	[01] 0x04000014 key: class2->keyreg len=20
	67	@0xffe01000
	68	[03] 0x84410014 operation: cls2-op sha1 hmac init dec
	69	[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm
	70	[05] 0xa4000001 jump: class2 local all ->1 [06]
	71	[06] 0x64260028 fifostr: class2 mdsplit-jdk len=40
	72	@0xffe04000
	73	*/
db57656b	74	int gen_split_key(struct device jrdev, u8 key_out,
6655cb8e HG	75	struct alginfo * const adata, const u8 *key_in, u32 keylen,
6655cb8e HG	76	int max_keylen)
4c1ec1f9 YK	77	{
	78	u32 *desc;
	79	struct split_key_result result;
	80	dma_addr_t dma_addr_in, dma_addr_out;
738459e3	81	int ret = -ENOMEM;
4c1ec1f9	82
6655cb8e HG	83	adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
	84	adata->keylen_pad = split_key_pad_len(adata->algtype &
	85	OP_ALG_ALGSEL_MASK);
	86
	87	#ifdef DEBUG
	88	dev_err(jrdev, "split keylen %d split keylen padded %d\n",
	89	adata->keylen, adata->keylen_pad);
	90	print_hex_dump(KERN_ERR, "ctx.key@" __stringify(__LINE__)": ",
	91	DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
	92	#endif
	93
	94	if (adata->keylen_pad > max_keylen)
	95	return -EINVAL;
	96
4c1ec1f9	97	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL \| GFP_DMA);
2af8f4a2 KP	98	if (!desc) {
2af8f4a2 KP	99	dev_err(jrdev, "unable to allocate key input memory\n");
738459e3	100	return ret;
2af8f4a2	101	}
4c1ec1f9	102
4c1ec1f9 YK	103	dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
	104	DMA_TO_DEVICE);
	105	if (dma_mapping_error(jrdev, dma_addr_in)) {
	106	dev_err(jrdev, "unable to map key input memory\n");
738459e3	107	goto out_free;
4c1ec1f9	108	}
738459e3	109
db57656b	110	dma_addr_out = dma_map_single(jrdev, key_out, adata->keylen_pad,
738459e3 CS	111	DMA_FROM_DEVICE);
	112	if (dma_mapping_error(jrdev, dma_addr_out)) {
	113	dev_err(jrdev, "unable to map key output memory\n");
	114	goto out_unmap_in;
	115	}
	116
	117	init_job_desc(desc, 0);
4c1ec1f9 YK	118	append_key(desc, dma_addr_in, keylen, CLASS_2 \| KEY_DEST_CLASS_REG);
	119
	120	/* Sets MDHA up into an HMAC-INIT */
488ebc3a HG	121	append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) \|
	122	OP_ALG_AAI_HMAC \| OP_TYPE_CLASS2_ALG \| OP_ALG_DECRYPT \|
	123	OP_ALG_AS_INIT);
4c1ec1f9 YK	124
	125	/*
	126	* do a FIFO_LOAD of zero, this will trigger the internal key expansion
	127	* into both pads inside MDHA
	128	*/
	129	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB \|
	130	FIFOLD_TYPE_MSG \| FIFOLD_TYPE_LAST2);
	131
	132	/*
	133	* FIFO_STORE with the explicit split-key content store
	134	* (0x26 output type)
	135	*/
db57656b	136	append_fifo_store(desc, dma_addr_out, adata->keylen,
4c1ec1f9 YK	137	LDST_CLASS_2_CCB \| FIFOST_TYPE_SPLIT_KEK);
	138
	139	#ifdef DEBUG
514df281	140	print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
4c1ec1f9	141	DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
514df281	142	print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
4c1ec1f9 YK	143	DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
	144	#endif
	145
	146	result.err = 0;
	147	init_completion(&result.completion);
	148
	149	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
	150	if (!ret) {
	151	/* in progress */
7459e1d2	152	wait_for_completion(&result.completion);
4c1ec1f9 YK	153	ret = result.err;
4c1ec1f9 YK	154	#ifdef DEBUG
514df281	155	print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
4c1ec1f9	156	DUMP_PREFIX_ADDRESS, 16, 4, key_out,
db57656b	157	adata->keylen_pad, 1);
4c1ec1f9 YK	158	#endif
	159	}
	160
db57656b	161	dma_unmap_single(jrdev, dma_addr_out, adata->keylen_pad,
4c1ec1f9	162	DMA_FROM_DEVICE);
738459e3	163	out_unmap_in:
4c1ec1f9	164	dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
738459e3	165	out_free:
4c1ec1f9	166	kfree(desc);
4c1ec1f9 YK	167	return ret;
4c1ec1f9 YK	168	}
3b75a2c1	169	EXPORT_SYMBOL(gen_split_key);