[PATCH v2 07/14] fip: add function to calculate a sha256 over FIP image

[Marco Felsch]

On 25-03-11, Sascha Hauer wrote:
> This adds fip_sha256() to calculate a sha256 over a FIP image.
> 
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>

> ---
>  include/fiptool.h |  3 +++
>  lib/fip.c         | 23 ++++++++++++++++++++++-
>  2 files changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/include/fiptool.h b/include/fiptool.h
> index bb63a79c16..73b0fbe398 100644
> --- a/include/fiptool.h
> +++ b/include/fiptool.h
> @@ -38,6 +38,7 @@ struct fip_state {
>  	size_t nr_image_descs;
>  	int verbose;
>  	void *buffer;
> +	size_t bufsize;
>  	bool buf_no_free;
>  };
>  
> @@ -100,4 +101,6 @@ extern toc_entry_t plat_def_toc_entries[];
>  
>  struct fip_state *fip_image_open(const char *filename, size_t offset);
>  
> +int fip_sha256(struct fip_state *fip, char *hash);
> +
>  #endif /* FIPTOOL_H */
> diff --git a/lib/fip.c b/lib/fip.c
> index 8086b43412..7a5e3dc844 100644
> --- a/lib/fip.c
> +++ b/lib/fip.c
> @@ -24,6 +24,7 @@
>  #include <libfile.h>
>  #include <fs.h>
>  #include <linux/kernel.h>
> +#include <digest.h>
>  
>  #include <fip.h>
>  #include <fiptool.h>
> @@ -168,6 +169,7 @@ static int fip_do_parse_buf(struct fip_state *fip, void *buf, size_t size,
>  	int terminated = 0;
>  
>  	fip->buffer = buf;
> +	fip->bufsize = size;
>  
>  	bufend = fip->buffer + size;
>  
> @@ -570,10 +572,29 @@ struct fip_state *fip_image_open(const char *filename, size_t offset)
>  	close(fd);
>  
>  	return fip_state;
> -
>  err:
>  	close(fd);
>  	fip_free(fip_state);
>  
>  	return ERR_PTR(ret);
>  }
> +
> +int fip_sha256(struct fip_state *fip, char *hash)
> +{
> +	struct digest *d;
> +	int ret;
> +
> +	d = digest_alloc_by_algo(HASH_ALGO_SHA256);
> +	if (!d)
> +		return -ENOSYS;
> +
> +	digest_init(d);
> +
> +	digest_update(d, fip->buffer, fip->bufsize);
> +
> +	ret = digest_final(d, hash);
> +
> +	digest_free(d);
> +
> +	return ret;
> +}
> 
> -- 
> 2.39.5
> 
> 
>