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efi_loader: signature: make efi_hash_regions more generic 

There are a couple of occurrences of hash calculations in which a new
efi_hash_regions will be commonly used.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
This commit is contained in:
AKASHI Takahiro 2020-07-08 14:01:55 +09:00 committed by Heinrich Schuchardt
parent 36b2f9da5c
commit 1e64d0b5a4
1 changed files with 17 additions and 29 deletions
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38
lib/efi_loader/efi_signature.c
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@ -28,7 +28,8 @@ const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
/**
* efi_hash_regions - calculate a hash value
* @regs: List of regions
* @regs: Array of regions
* @count: Number of regions
* @hash: Pointer to a pointer to buffer holding a hash value
* @size: Size of buffer to be returned
*
@ -36,18 +37,20 @@ const efi_guid_t efi_guid_cert_type_pkcs7 = EFI_CERT_TYPE_PKCS7_GUID;
*
* Return: true on success, false on error
*/
static bool efi_hash_regions(struct efi_image_regions *regs, void **hash,
size_t *size)
static bool efi_hash_regions(struct image_region *regs, int count,
void **hash, size_t *size)
{
*size = 0;
if (!*hash) {
*hash = calloc(1, SHA256_SUM_LEN);
if (!*hash) {
EFI_PRINT("Out of memory\n");
return false;
}
}
if (size)
*size = SHA256_SUM_LEN;
hash_calculate("sha256", regs->reg, regs->num, *hash);
hash_calculate("sha256", regs, count, *hash);
#ifdef DEBUG
EFI_PRINT("hash calculated:\n");
print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
@ -72,26 +75,10 @@ static bool efi_hash_msg_content(struct pkcs7_message *msg, void **hash,
{
struct image_region regtmp;
*size = 0;
*hash = calloc(1, SHA256_SUM_LEN);
if (!*hash) {
EFI_PRINT("Out of memory\n");
free(msg);
return false;
}
*size = SHA256_SUM_LEN;
regtmp.data = msg->data;
regtmp.size = msg->data_len;
hash_calculate("sha256", &regtmp, 1, *hash);
#ifdef DEBUG
EFI_PRINT("hash calculated based on contentInfo:\n");
print_hex_dump(" ", DUMP_PREFIX_OFFSET, 16, 1,
*hash, SHA256_SUM_LEN, false);
#endif
return true;
return efi_hash_regions(&regtmp, 1, hash, size);
}
/**
@ -169,9 +156,10 @@ static bool efi_signature_verify(struct efi_image_regions *regs,
false);
#endif
/* against contentInfo first */
hash = NULL;
if ((msg->data && efi_hash_msg_content(msg, &hash, &size)) ||
/* for signed image */
efi_hash_regions(regs, &hash, &size)) {
efi_hash_regions(regs->reg, regs->num, &hash, &size)) {
/* for authenticated variable */
if (ps_info->msgdigest_len != size ||
memcmp(hash, ps_info->msgdigest, size)) {
@ -239,7 +227,7 @@ bool efi_signature_verify_with_list(struct efi_image_regions *regs,
regs, signed_info, siglist, valid_cert);
if (!signed_info) {
void *hash;
void *hash = NULL;
size_t size;
EFI_PRINT("%s: unsigned image\n", __func__);
@ -253,7 +241,7 @@ bool efi_signature_verify_with_list(struct efi_image_regions *regs,
goto out;
}
if (!efi_hash_regions(regs, &hash, &size)) {
if (!efi_hash_regions(regs->reg, regs->num, &hash, &size)) {
EFI_PRINT("Digesting unsigned image failed\n");
goto out;
}