From 60f208d7836216885cdcd6f77a02f31dbc66f169 Mon Sep 17 00:00:00 2001 From: Kim Phillips Date: Wed, 19 May 2010 19:21:53 +1000 Subject: crypto: talitos - add support for sha224 SEC h/w versions 2.1 and above support sha224 via explicit instruction. Performing sha224 ahashes on earlier versions is still possible because they support sha256 (sha224 is sha256 with different initial constants and a different truncation length). We do this by overriding hardware context self-initialization, and perform it manually in s/w instead. Thanks to Lee for his fixes for correct execution on actual sec2.0 h/w. Signed-off-by: Kim Phillips Signed-off by: Lee Nipper Signed-off-by: Herbert Xu --- drivers/crypto/talitos.c | 81 ++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 72 insertions(+), 9 deletions(-) (limited to 'drivers/crypto/talitos.c') diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c index 1b08a3951fb..6a0f59d1fc5 100644 --- a/drivers/crypto/talitos.c +++ b/drivers/crypto/talitos.c @@ -1,7 +1,7 @@ /* * talitos - Freescale Integrated Security Engine (SEC) device driver * - * Copyright (c) 2008 Freescale Semiconductor, Inc. + * Copyright (c) 2008-2010 Freescale Semiconductor, Inc. * * Scatterlist Crypto API glue code copied from files with the following: * Copyright (c) 2006-2007 Herbert Xu @@ -156,6 +156,7 @@ struct talitos_private { /* .features flag */ #define TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT 0x00000001 #define TALITOS_FTR_HW_AUTH_CHECK 0x00000002 +#define TALITOS_FTR_SHA224_HWINIT 0x00000004 static void to_talitos_ptr(struct talitos_ptr *talitos_ptr, dma_addr_t dma_addr) { @@ -720,10 +721,11 @@ struct talitos_ctx { struct talitos_ahash_req_ctx { u64 count; - u8 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE]; + u32 hw_context[TALITOS_MDEU_MAX_CONTEXT_SIZE / sizeof(u32)]; unsigned int hw_context_size; u8 buf[HASH_MAX_BLOCK_SIZE]; u8 bufnext[HASH_MAX_BLOCK_SIZE]; + unsigned int swinit; unsigned int first; unsigned int last; unsigned int to_hash_later; @@ -1631,12 +1633,13 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc, /* first DWORD empty */ desc->ptr[0] = zero_entry; - /* hash context in (if not first) */ - if (!req_ctx->first) { + /* hash context in */ + if (!req_ctx->first || req_ctx->swinit) { map_single_talitos_ptr(dev, &desc->ptr[1], req_ctx->hw_context_size, (char *)req_ctx->hw_context, 0, DMA_TO_DEVICE); + req_ctx->swinit = 0; } else { desc->ptr[1] = zero_entry; /* Indicate next op is not the first. */ @@ -1722,7 +1725,8 @@ static int ahash_init(struct ahash_request *areq) /* Initialize the context */ req_ctx->count = 0; - req_ctx->first = 1; /* first indicates h/w must init it's context */ + req_ctx->first = 1; /* first indicates h/w must init its context */ + req_ctx->swinit = 0; /* assume h/w init of context */ req_ctx->hw_context_size = (crypto_ahash_digestsize(tfm) <= SHA256_DIGEST_SIZE) ? TALITOS_MDEU_CONTEXT_SIZE_MD5_SHA1_SHA256 @@ -1731,6 +1735,33 @@ static int ahash_init(struct ahash_request *areq) return 0; } +/* + * on h/w without explicit sha224 support, we initialize h/w context + * manually with sha224 constants, and tell it to run sha256. + */ +static int ahash_init_sha224_swinit(struct ahash_request *areq) +{ + struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq); + + ahash_init(areq); + req_ctx->swinit = 1;/* prevent h/w initting context with sha256 values*/ + + req_ctx->hw_context[0] = cpu_to_be32(SHA224_H0); + req_ctx->hw_context[1] = cpu_to_be32(SHA224_H1); + req_ctx->hw_context[2] = cpu_to_be32(SHA224_H2); + req_ctx->hw_context[3] = cpu_to_be32(SHA224_H3); + req_ctx->hw_context[4] = cpu_to_be32(SHA224_H4); + req_ctx->hw_context[5] = cpu_to_be32(SHA224_H5); + req_ctx->hw_context[6] = cpu_to_be32(SHA224_H6); + req_ctx->hw_context[7] = cpu_to_be32(SHA224_H7); + + /* init 64-bit count */ + req_ctx->hw_context[8] = 0; + req_ctx->hw_context[9] = 0; + + return 0; +} + static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes) { struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq); @@ -1799,8 +1830,8 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes) else edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_CONT; - /* On first one, request SEC to INIT hash. */ - if (req_ctx->first) + /* request SEC to INIT hash. */ + if (req_ctx->first && !req_ctx->swinit) edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_INIT; /* When the tfm context has a keylen, it's an HMAC. @@ -1843,8 +1874,9 @@ static int ahash_finup(struct ahash_request *areq) static int ahash_digest(struct ahash_request *areq) { struct talitos_ahash_req_ctx *req_ctx = ahash_request_ctx(areq); + struct crypto_ahash *ahash = crypto_ahash_reqtfm(areq); - ahash_init(areq); + ahash->init(areq); req_ctx->last = 1; return ahash_process_req(areq, areq->nbytes); @@ -2109,6 +2141,27 @@ static struct talitos_alg_template driver_algs[] = { DESC_HDR_SEL0_MDEUA | DESC_HDR_MODE0_MDEU_SHA1, }, + { .type = CRYPTO_ALG_TYPE_AHASH, + .alg.hash = { + .init = ahash_init, + .update = ahash_update, + .final = ahash_final, + .finup = ahash_finup, + .digest = ahash_digest, + .halg.digestsize = SHA224_DIGEST_SIZE, + .halg.base = { + .cra_name = "sha224", + .cra_driver_name = "sha224-talitos", + .cra_blocksize = SHA224_BLOCK_SIZE, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC, + .cra_type = &crypto_ahash_type + } + }, + .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU | + DESC_HDR_SEL0_MDEUA | + DESC_HDR_MODE0_MDEU_SHA224, + }, { .type = CRYPTO_ALG_TYPE_AHASH, .alg.hash = { .init = ahash_init, @@ -2298,6 +2351,7 @@ static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev, struct talitos_alg_template *template) { + struct talitos_private *priv = dev_get_drvdata(dev); struct talitos_crypto_alg *t_alg; struct crypto_alg *alg; @@ -2319,6 +2373,14 @@ static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev, case CRYPTO_ALG_TYPE_AHASH: alg = &t_alg->algt.alg.hash.halg.base; alg->cra_init = talitos_cra_init_ahash; + if (!(priv->features & TALITOS_FTR_SHA224_HWINIT) && + !strcmp(alg->cra_name, "sha224")) { + t_alg->algt.alg.hash.init = ahash_init_sha224_swinit; + t_alg->algt.desc_hdr_template = + DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU | + DESC_HDR_SEL0_MDEUA | + DESC_HDR_MODE0_MDEU_SHA256; + } break; } @@ -2406,7 +2468,8 @@ static int talitos_probe(struct of_device *ofdev, priv->features |= TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT; if (of_device_is_compatible(np, "fsl,sec2.1")) - priv->features |= TALITOS_FTR_HW_AUTH_CHECK; + priv->features |= TALITOS_FTR_HW_AUTH_CHECK | + TALITOS_FTR_SHA224_HWINIT; priv->chan = kzalloc(sizeof(struct talitos_channel) * priv->num_channels, GFP_KERNEL); -- cgit v1.2.3