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lib: crypto: add public_key_verify_signature()

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This function will be called from x509_check_for_self_signed() and
pkcs7_verify_one(), which will be imported from linux in a later patch.

While it does exist in linux code and has a similar functionality of
rsa_verify(), it calls further linux-specific interfaces inside.
That could lead to more files being imported from linux.

So simply re-implement it here instead of re-using the code.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro 2020-07-21 19:35:17 +09:00 committed by Heinrich Schuchardt
parent a58dfd2969
commit b2a1049b5c
2 changed files with 70 additions and 2 deletions
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2
include/crypto/public_key.h
View file

@ -82,9 +82,9 @@ extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
extern int create_signature(struct kernel_pkey_params *, const void *, void *);
extern int verify_signature(const struct key *,
const struct public_key_signature *);
#endif /* __UBOOT__ */
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig);
#endif /* !__UBOOT__ */
#endif /* _LINUX_PUBLIC_KEY_H */

70
lib/crypto/public_key.c
View file

@ -25,7 +25,10 @@
#include <keys/asymmetric-subtype.h>
#endif
#include <crypto/public_key.h>
#ifndef __UBOOT__
#ifdef __UBOOT__
#include <image.h>
#include <u-boot/rsa.h>
#else
#include <crypto/akcipher.h>
#endif
@ -80,6 +83,71 @@ void public_key_signature_free(struct public_key_signature *sig)
}
EXPORT_SYMBOL_GPL(public_key_signature_free);
/**
* public_key_verify_signature - Verify a signature using a public key.
*
* @pkey: Public key
* @sig: Signature
*
* Verify a signature, @sig, using a RSA public key, @pkey.
*
* Return: 0 - verified, non-zero error code - otherwise
*/
int public_key_verify_signature(const struct public_key *pkey,
const struct public_key_signature *sig)
{
struct image_sign_info info;
struct image_region region;
int ret;
pr_devel("==>%s()\n", __func__);
if (!pkey || !sig)
return -EINVAL;
if (pkey->key_is_private)
return -EINVAL;
memset(&info, '\0', sizeof(info));
info.padding = image_get_padding_algo("pkcs-1.5");
/*
* Note: image_get_[checksum|crypto]_algo takes a string
* argument like "<checksum>,<crypto>"
* TODO: support other hash algorithms
*/
if (strcmp(sig->pkey_algo, "rsa") || (sig->s_size * 8) != 2048) {
pr_warn("Encryption is not RSA2048: %s%d\n",
sig->pkey_algo, sig->s_size * 8);
return -ENOPKG;
}
if (!strcmp(sig->hash_algo, "sha1")) {
info.checksum = image_get_checksum_algo("sha1,rsa2048");
info.name = "sha1,rsa2048";
} else if (!strcmp(sig->hash_algo, "sha256")) {
info.checksum = image_get_checksum_algo("sha256,rsa2048");
info.name = "sha256,rsa2048";
} else {
pr_warn("unknown msg digest algo: %s\n", sig->hash_algo);
return -ENOPKG;
}
info.crypto = image_get_crypto_algo(info.name);
if (IS_ERR(info.checksum) || IS_ERR(info.crypto))
return -ENOPKG;
info.key = pkey->key;
info.keylen = pkey->keylen;
region.data = sig->digest;
region.size = sig->digest_size;
if (rsa_verify_with_pkey(&info, sig->digest, sig->s, sig->s_size))
ret = -EKEYREJECTED;
else
ret = 0;
pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
}
#else
/*
* Destroy a public key algorithm key.