From: Tudor Ambarus Subject: [PATCH 02/10] crypto: rsa_helper - add raw integer parser actions Date: Fri, 18 Mar 2016 20:31:59 +0200 Message-ID: <1458325927-14737-2-git-send-email-tudor-dan.ambarus@nxp.com> References: <1458325927-14737-1-git-send-email-tudor-dan.ambarus@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , Tudor Ambarus To: , Return-path: Received: from mail-bl2on0091.outbound.protection.outlook.com ([65.55.169.91]:2880 "EHLO na01-bl2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752183AbcCRScT (ORCPT ); Fri, 18 Mar 2016 14:32:19 -0400 In-Reply-To: <1458325927-14737-1-git-send-email-tudor-dan.ambarus@nxp.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: Dedicated to RSA (hardware) implementations that want to use raw integers instead of MPI keys. Signed-off-by: Tudor Ambarus --- crypto/rsa.c | 15 ---- crypto/rsa_helper.c | 158 ++++++++++++++++++++++++++++++++++++++++++ include/crypto/internal/rsa.h | 24 +++++++ 3 files changed, 182 insertions(+), 15 deletions(-) diff --git a/crypto/rsa.c b/crypto/rsa.c index 2d53ad8..44baccf 100644 --- a/crypto/rsa.c +++ b/crypto/rsa.c @@ -235,21 +235,6 @@ err_free_m: return ret; } -static int rsa_check_key_length(unsigned int len) -{ - switch (len) { - case 512: - case 1024: - case 1536: - case 2048: - case 3072: - case 4096: - return 0; - } - - return -EINVAL; -} - static int rsa_set_pub_key(struct crypto_akcipher *tfm, const void *key, unsigned int keylen) { diff --git a/crypto/rsa_helper.c b/crypto/rsa_helper.c index 1ed32af..1708db8 100644 --- a/crypto/rsa_helper.c +++ b/crypto/rsa_helper.c @@ -14,6 +14,9 @@ #include #include #include +#include +#include +#include #include #include "rsapubkey-asn1.h" #include "rsaprivkey-asn1.h" @@ -190,3 +193,158 @@ void set_rsa_priv_action(struct rsa_asn1_action *action) action->get_n = rsa_get_mpi_n; } EXPORT_SYMBOL_GPL(set_rsa_priv_action); + +int rsa_check_key_length(unsigned int len) +{ + switch (len) { + case 512: + case 1024: + case 1536: + case 2048: + case 3072: + case 4096: + return 0; + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(rsa_check_key_length); + +int raw_rsa_get_n(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct rsa_raw_ctx *ctx = context; + struct rsa_raw_key *key = &ctx->key; + const char *ptr = value; + int ret = -EINVAL; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + key->n_sz = vlen; + /* In FIPS mode only allow key size 2K & 3K */ + if (fips_enabled && (key->n_sz != 256 && key->n_sz != 384)) { + dev_err(ctx->dev, "RSA: key size not allowed in FIPS mode\n"); + goto err; + } + /* invalid key size provided */ + ret = rsa_check_key_length(key->n_sz << 3); + if (ret) + goto err; + + if (key->is_coherent) + key->n = kzalloc(key->n_sz, key->flags); + else + key->n = dma_zalloc_coherent(ctx->dev, key->n_sz, &key->dma_n, + key->flags); + + if (!key->n) { + ret = -ENOMEM; + goto err; + } + + memcpy(key->n, ptr, key->n_sz); + + return 0; +err: + key->n_sz = 0; + key->n = NULL; + return ret; +} + +int raw_rsa_get_e(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct rsa_raw_ctx *ctx = context; + struct rsa_raw_key *key = &ctx->key; + const char *ptr = value; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + key->e_sz = vlen; + + if (!key->n_sz || !vlen || vlen > key->n_sz) { + key->e = NULL; + return -EINVAL; + } + + if (key->is_coherent) + key->e = kzalloc(key->e_sz, key->flags); + else + key->e = dma_zalloc_coherent(ctx->dev, key->n_sz, &key->dma_e, + key->flags); + + if (!key->e) + return -ENOMEM; + + if (key->is_coherent) + memcpy(key->e, ptr, key->e_sz); + else + memcpy(key->e + (key->n_sz - vlen), ptr, vlen); + + return 0; +} + +int raw_rsa_get_d(void *context, size_t hdrlen, unsigned char tag, + const void *value, size_t vlen) +{ + struct rsa_raw_ctx *ctx = context; + struct rsa_raw_key *key = &ctx->key; + const char *ptr = value; + int ret = -EINVAL; + + while (!*ptr && vlen) { + ptr++; + vlen--; + } + + if (!key->n_sz || !vlen || vlen > key->n_sz) + goto err; + + /* In FIPS mode only allow key size 2K & 3K */ + if (fips_enabled && (vlen != 256 && vlen != 384)) { + dev_err(ctx->dev, "RSA: key size not allowed in FIPS mode\n"); + goto err; + } + + if (key->is_coherent) + key->d = kzalloc(key->n_sz, key->flags); + else + key->d = dma_zalloc_coherent(ctx->dev, key->n_sz, &key->dma_d, + key->flags); + + if (!key->n) { + ret = -ENOMEM; + goto err; + } + + if (key->is_coherent) + memcpy(key->d, ptr, vlen); + else + memcpy(key->d + (key->n_sz - vlen), ptr, vlen); + + return 0; +err: + key->d = NULL; + return ret; +} + +void set_raw_rsa_pub_action(struct rsa_asn1_action *action) +{ + action->get_e = raw_rsa_get_e; + action->get_n = raw_rsa_get_n; +} +EXPORT_SYMBOL_GPL(set_raw_rsa_pub_action); + +void set_raw_rsa_priv_action(struct rsa_asn1_action *action) +{ + action->get_d = raw_rsa_get_d; + action->get_e = raw_rsa_get_e; + action->get_n = raw_rsa_get_n; +} +EXPORT_SYMBOL_GPL(set_raw_rsa_priv_action); diff --git a/include/crypto/internal/rsa.h b/include/crypto/internal/rsa.h index bf0f49d..7820e83 100644 --- a/include/crypto/internal/rsa.h +++ b/include/crypto/internal/rsa.h @@ -20,6 +20,19 @@ struct rsa_mpi_key { MPI d; }; +struct rsa_raw_key { + u8 *n; + u8 *e; + u8 *d; + dma_addr_t dma_n; + dma_addr_t dma_e; + dma_addr_t dma_d; + size_t n_sz; + size_t e_sz; + bool is_coherent; + gfp_t flags; +}; + struct rsa_asn1_action { int (*get_n)(void *context, size_t hdrlen, unsigned char tag, const void *value, size_t vlen); @@ -34,6 +47,12 @@ struct rsa_ctx { struct rsa_mpi_key key; }; +struct rsa_raw_ctx { + struct rsa_asn1_action action; + struct rsa_raw_key key; + struct device *dev; +}; + void rsa_free_mpi_key(struct rsa_mpi_key *key); int rsa_parse_mpi_pub_key(struct rsa_ctx *ctx, const void *key, @@ -44,5 +63,10 @@ int rsa_parse_mpi_priv_key(struct rsa_ctx *ctx, const void *key, void set_rsa_pub_action(struct rsa_asn1_action *action); void set_rsa_priv_action(struct rsa_asn1_action *action); +int rsa_check_key_length(unsigned int len); + +void set_raw_rsa_pub_action(struct rsa_asn1_action *action); +void set_raw_rsa_priv_action(struct rsa_asn1_action *action); + extern struct crypto_template rsa_pkcs1pad_tmpl; #endif -- 1.8.3.1