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lib: crypto: add pkcs7_digest()

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This function was nullified when the file, pkcs7_verify.c, was imported
because it calls further linux-specific interfaces inside, hence that
could lead to more files being imported from linux.

We need this function in pkcs7_verify_one() and 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 19:35:20 +09:00 committed by Heinrich Schuchardt
parent 063499e38e
commit 05329fa4c0
1 changed files with 89 additions and 3 deletions
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92
lib/crypto/pkcs7_verify.c
View file

@ -10,10 +10,12 @@
#define pr_fmt(fmt) "PKCS7: "fmt
#ifdef __UBOOT__
#include <image.h>
#include <string.h>
#include <linux/bitops.h>
#include <linux/compat.h>
#include <linux/asn1.h>
#include <u-boot/rsa-checksum.h>
#include <crypto/public_key.h>
#include <crypto/pkcs7_parser.h>
#else
@ -29,15 +31,99 @@
#endif
/*
* Digest the relevant parts of the PKCS#7 data
* pkcs7_digest - Digest the relevant parts of the PKCS#7 data
* @pkcs7: PKCS7 Signed Data
* @sinfo: PKCS7 Signed Info
*
* Digest the relevant parts of the PKCS#7 data, @pkcs7, using signature
* information in @sinfo. But if there are authentication attributes,
* i.e. signed image case, the digest must be calculated against
* the authentication attributes.
*
* Return: 0 - on success, non-zero error code - otherwise
*/
#ifdef __UBOOT__
static int pkcs7_digest(struct pkcs7_message *pkcs7,
struct pkcs7_signed_info *sinfo)
{
return 0;
struct public_key_signature *sig = sinfo->sig;
struct image_region regions[2];
int ret = 0;
/* The digest was calculated already. */
if (sig->digest)
return 0;
if (!sinfo->sig->hash_algo)
return -ENOPKG;
if (!strcmp(sinfo->sig->hash_algo, "sha256"))
sig->digest_size = SHA256_SUM_LEN;
else if (!strcmp(sinfo->sig->hash_algo, "sha1"))
sig->digest_size = SHA1_SUM_LEN;
else
return -ENOPKG;
sig->digest = calloc(1, sig->digest_size);
if (!sig->digest) {
pr_warn("Sig %u: Out of memory\n", sinfo->index);
return -ENOMEM;
}
regions[0].data = pkcs7->data;
regions[0].size = pkcs7->data_len;
/* Digest the message [RFC2315 9.3] */
hash_calculate(sinfo->sig->hash_algo, regions, 1, sig->digest);
/* However, if there are authenticated attributes, there must be a
* message digest attribute amongst them which corresponds to the
* digest we just calculated.
*/
if (sinfo->authattrs) {
u8 tag;
if (!sinfo->msgdigest) {
pr_warn("Sig %u: No messageDigest\n", sinfo->index);
ret = -EKEYREJECTED;
goto error;
}
if (sinfo->msgdigest_len != sig->digest_size) {
pr_debug("Sig %u: Invalid digest size (%u)\n",
sinfo->index, sinfo->msgdigest_len);
ret = -EBADMSG;
goto error;
}
if (memcmp(sig->digest, sinfo->msgdigest,
sinfo->msgdigest_len) != 0) {
pr_debug("Sig %u: Message digest doesn't match\n",
sinfo->index);
ret = -EKEYREJECTED;
goto error;
}
/* We then calculate anew, using the authenticated attributes
* as the contents of the digest instead. Note that we need to
* convert the attributes from a CONT.0 into a SET before we
* hash it.
*/
memset(sig->digest, 0, sig->digest_size);
tag = 0x31;
regions[0].data = &tag;
regions[0].size = 1;
regions[1].data = sinfo->authattrs;
regions[1].size = sinfo->authattrs_len;
hash_calculate(sinfo->sig->hash_algo, regions, 2, sig->digest);
ret = 0;
}
error:
return ret;
}
#else
#else /* !__UBOOT__ */
static int pkcs7_digest(struct pkcs7_message *pkcs7,
struct pkcs7_signed_info *sinfo)
{