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exosphere: correct reencryption of rsa private keys
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524da78b0e
commit
7bc0250cea
1 changed files with 15 additions and 13 deletions
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@ -13,7 +13,7 @@
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <string.h>
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@ -83,7 +83,7 @@ static void ghash(void *dst, const void *data, size_t data_size, const void *j_b
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/* H = aes_ecb_encrypt(zeroes) */
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se_aes_128_ecb_encrypt_block(KEYSLOT_SWITCH_TEMPKEY, h, 0x10, x, 0x10);
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size_t total_size = data_size;
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while (data_size >= 0x10) {
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@ -103,7 +103,7 @@ static void ghash(void *dst, const void *data, size_t data_size, const void *j_b
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if (data_size & 0xF) {
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gf128_mul(x, x, h);
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}
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uint64_t xor_size = total_size << 3;
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xor_size = __builtin_bswap64(xor_size);
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@ -113,9 +113,9 @@ static void ghash(void *dst, const void *data, size_t data_size, const void *j_b
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} else {
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p_x[1] ^= xor_size;
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}
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gf128_mul(x, x, h);
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/* If final output block, XOR with encrypted J block. */
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if (encrypt) {
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se_aes_128_ecb_encrypt_block(KEYSLOT_SWITCH_TEMPKEY, h, 0x10, j_block, 0x10);
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@ -140,22 +140,22 @@ size_t gcm_decrypt_key(void *dst, size_t dst_size, const void *src, size_t src_s
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generic_panic();
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}
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}
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uint8_t intermediate_buf[0x400] = {0};
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/* Unwrap the key */
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unseal_key(KEYSLOT_SWITCH_TEMPKEY, sealed_kek, kek_size, usecase);
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decrypt_data_into_keyslot(KEYSLOT_SWITCH_TEMPKEY, KEYSLOT_SWITCH_TEMPKEY, wrapped_key, key_size);
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/* Decrypt the GCM keypair, AES-CTR with CTR = blob[:0x10]. */
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se_aes_ctr_crypt(KEYSLOT_SWITCH_TEMPKEY, intermediate_buf, dst_size, src + 0x10, src_size - 0x10, src, 0x10);
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if (!is_personalized) {
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/* Devkit non-personalized keys have no further authentication. */
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memcpy(dst, intermediate_buf, src_size - 0x10);
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memset(intermediate_buf, 0, sizeof(intermediate_buf));
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return src_size - 0x10;
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}
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}
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/* J = GHASH(CTR); */
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uint8_t j_block[0x10];
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@ -166,7 +166,7 @@ size_t gcm_decrypt_key(void *dst, size_t dst_size, const void *src, size_t src_s
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/* It is supposed to be over the ciphertext. */
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uint8_t calc_mac[0x10];
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ghash(calc_mac, intermediate_buf, src_size - 0x20, j_block, true);
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/* Const-time memcmp. */
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const uint8_t *src_bytes = src;
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int different = 0;
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@ -184,7 +184,7 @@ size_t gcm_decrypt_key(void *dst, size_t dst_size, const void *src, size_t src_s
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if (out_deviceid_high != NULL) {
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*out_deviceid_high = intermediate_buf[src_size - 0x28];
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}
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memcpy(dst, intermediate_buf, src_size - 0x30);
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memset(intermediate_buf, 0, sizeof(intermediate_buf));
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return src_size - 0x30;
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@ -205,10 +205,12 @@ void gcm_encrypt_key(void *dst, size_t dst_size, const void *src, size_t src_siz
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se_generate_random(KEYSLOT_SWITCH_RNGKEY, intermediate_buf, 0x10);
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flush_dcache_range(intermediate_buf, intermediate_buf + 0x10);
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/* Copy in the src. */
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memcpy(intermediate_buf + 0x10, src, src_size);
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/* Write Device ID. */
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write64be(intermediate_buf, src_size + 0x18, fuse_get_device_id() | (deviceid_high << 56));
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/* J = GHASH(CTR); */
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uint8_t j_block[0x10];
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ghash(j_block, intermediate_buf, 0x10, NULL, false);
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