diff options
author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2020-02-21 15:12:58 +0900 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2020-03-12 08:20:39 -0400 |
commit | e0d310b098b1e3dd2ad4e0e4efbbb81b90ae4bc7 (patch) | |
tree | 3dde95fd0f55216aa7d094a1c057f5984f03f392 /include | |
parent | a8fc3df8b96fb968e72d5f2f10d07322f81adc8a (diff) |
lib: rsa: generate additional parameters for public key
In the current implementation of FIT_SIGNATURE, five parameters for
a RSA public key are required while only two of them are essential.
(See rsa-mod-exp.h and uImage.FIT/signature.txt)
This is a result of considering relatively limited computer power
and resources on embedded systems, while such a assumption may not
be quite practical for other use cases.
In this patch, added is a function, rsa_gen_key_prop(), which will
generate additional parameters for other uses, in particular
UEFI secure boot, on the fly.
Note: the current code uses some "big number" routines from BearSSL
for the calculation.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Diffstat (limited to 'include')
-rw-r--r-- | include/u-boot/rsa-mod-exp.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/u-boot/rsa-mod-exp.h b/include/u-boot/rsa-mod-exp.h index 8a428c4b6a..1da8af1bb8 100644 --- a/include/u-boot/rsa-mod-exp.h +++ b/include/u-boot/rsa-mod-exp.h @@ -27,6 +27,29 @@ struct key_prop { }; /** + * rsa_gen_key_prop() - Generate key properties of RSA public key + * @key: Specifies key data in DER format + * @keylen: Length of @key + * @prop: Generated key property + * + * This function takes a blob of encoded RSA public key data in DER + * format, parse it and generate all the relevant properties + * in key_prop structure. + * Return a pointer to struct key_prop in @prop on success. + * + * Return: 0 on success, negative on error + */ +int rsa_gen_key_prop(const void *key, uint32_t keylen, struct key_prop **proc); + +/** + * rsa_free_key_prop() - Free key properties + * @prop: Pointer to struct key_prop + * + * This function frees all the memories allocated by rsa_gen_key_prop(). + */ +void rsa_free_key_prop(struct key_prop *prop); + +/** * rsa_mod_exp_sw() - Perform RSA Modular Exponentiation in sw * * Operation: out[] = sig ^ exponent % modulus |