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host_key2: Add VB2_SIG_ALG_COUNT to count the number of valid signatures

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More reliable than simply assuming that VB2_SIG_RSA8192 is the last
signature.

BRANCH=none
BUG=chromium:684354
TEST=rm tests/testkeys/key_*; make genkeys -j
TEST=make runtests -j

Change-Id: I755b3afb50313fcdf292fb3cd5b0dfe09f8593e3
Reviewed-on: https://chromium-review.googlesource.com/438948
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Nicolas Boichat
2017-02-07 14:55:33 +08:00
committed by chrome-bot
parent c7282f6bdc
commit 8c53e881f8
2 changed files with 7 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
firmware/2lib/include/2crypto.h
View File

@@ -44,6 +44,9 @@ enum vb2_signature_algorithm {
VB2_SIG_RSA2048 = 3,
VB2_SIG_RSA4096 = 4,
VB2_SIG_RSA8192 = 5,
/* Last index. Don't add anything below. */
VB2_SIG_ALG_COUNT,
};
/* Algorithm types for hash digests */

6
host/lib/host_key2.c
View File

@@ -29,7 +29,7 @@ enum vb2_crypto_algorithm vb2_get_crypto_algorithm(
enum vb2_signature_algorithm sig_alg)
{
/* Make sure algorithms are in the range supported by crypto alg */
if (sig_alg < VB2_SIG_RSA1024 || sig_alg > VB2_SIG_RSA8192)
if (sig_alg < VB2_SIG_RSA1024 || sig_alg >= VB2_SIG_ALG_COUNT)
return VB2_ALG_COUNT;
if (hash_alg < VB2_HASH_SHA1 || hash_alg > VB2_HASH_SHA512)
return VB2_ALG_COUNT;
@@ -129,8 +129,10 @@ int vb2_write_private_key(const char *filename,
{
/* Convert back to legacy vb1 algorithm enum */
uint64_t alg = vb2_get_crypto_algorithm(key->hash_alg, key->sig_alg);
if (alg == VB2_ALG_COUNT)
if (alg == VB2_ALG_COUNT) {
fprintf(stderr, "Can't find crypto algorithm\n");
return VB2_ERROR_VB1_CRYPTO_ALGORITHM;
}
uint8_t *outbuf = NULL;
int buflen = i2d_RSAPrivateKey(key->rsa_private_key, &outbuf);