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ta: pkcs11: fix CKM_RSA_X_509 signature size verification #7179

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ta: pkcs11: fix CKM_RSA_X_509 signature size verification #7179

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16 changes: 9 additions & 7 deletions ta/pkcs11/src/processing_asymm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -899,14 +899,16 @@ enum pkcs11_rc step_asymm_operation(struct pkcs11_session *session,
tee_attrs, tee_attrs_count,
in_buf, in_size,
temp_buf, &temp_size);
if (!res && temp_size != sz) {
EMSG("CMK_RSA_X509: signature size %zu != %zu",
temp_size, sz);
rc = PKCS11_CKR_DATA_INVALID;
break;
}
if (!res) {
TEE_MemMove(out_buf, temp_buf, sz);
/*
* Raw RSA decryption may remove some
* leading nul bytes as done by rsadorep()
* (lib/libtomcrypt/rsa.c). Restore them to
* reach target signature size.
*/
TEE_MemFill(out_buf, 0, sz - temp_size);
TEE_MemMove((uint8_t *)out_buf + sz - temp_size,
temp_buf, temp_size);
TEE_MemFill(temp_buf, 0xa5, sz);
}
output_data = true;
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