Am Freitag, 18. März 2016, 20:31:59 schrieb Tudor Ambarus:
Hi Tudor,
> Dedicated to RSA (hardware) implementations that want to use
> raw integers instead of MPI keys.
>
> Signed-off-by: Tudor Ambarus <tudor-dan.amba...@nxp.com>
> ---
> 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 <linux/export.h>
> #include <linux/err.h>
> #include <linux/fips.h>
> +#include <linux/slab.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/device.h>
> #include <crypto/internal/rsa.h>
> #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;
> + }
I know that you copied the code to a new location that was there already. But
based on the discussion we had for DH, does it make sense that the kernel adds
such (artificial) limits?
> +
> + 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)) {
Again, you copied that code that used to be there . But very very recently,
NIST allowed 4k keys too. May I ask to allow it here?
> + 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
Ciao
Stephan
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