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From c6d6be8b7c1c1fa346af420daada56e28da5af6d Mon Sep 17 00:00:00 2001
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From: Ingo Franzki <ifranzki@linux.ibm.com>
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Date: Fri, 4 Nov 2022 09:44:35 +0100
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Subject: [PATCH 06/34] EP11: Pass back chain code for CKM_IBM_BTC_DERIVE
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When deriving a key using CKM_IBM_BTC_DERIVE, the resulting chain code
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must be passed back in the buffer supplied by the caller in the
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mechanism parameter (field pChainCode in CK_IBM_BTC_DERIVE_PARAMS).
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This chain code can then be used to derive further keys from the just
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derived key.
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Note that field ulChainCodeLen must be zero for any BTC master key
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derivation, but pChainCode must still point to a buffer of 32 bytes
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(CK_IBM_BTC_CHAINCODE_LENGTH) to receive the resulting chain code.
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Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
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---
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usr/lib/ep11_stdll/ep11_specific.c | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/usr/lib/ep11_stdll/ep11_specific.c b/usr/lib/ep11_stdll/ep11_specific.c
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index 432790f1..a56b5b82 100644
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--- a/usr/lib/ep11_stdll/ep11_specific.c
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+++ b/usr/lib/ep11_stdll/ep11_specific.c
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@@ -4988,6 +4988,7 @@ CK_RV ep11tok_derive_key(STDLL_TokData_t * tokdata, SESSION * session,
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CK_ULONG used_firmware_API_version;
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CK_MECHANISM_PTR mech_orig = mech;
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CK_ATTRIBUTE *ec_params;
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+ CK_IBM_BTC_DERIVE_PARAMS *btc_params = NULL;
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memset(newblob, 0, sizeof(newblob));
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@@ -5106,6 +5107,18 @@ CK_RV ep11tok_derive_key(STDLL_TokData_t * tokdata, SESSION * session,
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}
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}
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+ if (mech->mechanism == CKM_IBM_BTC_DERIVE) {
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+ if (mech->ulParameterLen != sizeof(CK_IBM_BTC_DERIVE_PARAMS) ||
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+ mech->pParameter == NULL) {
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+ TRACE_ERROR("%s Param NULL or len for %s wrong: %lu\n",
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+ __func__, ep11_get_ckm(tokdata, mech->mechanism),
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+ mech->ulParameterLen);
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+ return CKR_MECHANISM_PARAM_INVALID;
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+ }
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+
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+ btc_params = (CK_IBM_BTC_DERIVE_PARAMS *)mech->pParameter;
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+ }
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+
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rc = h_opaque_2_blob(tokdata, hBaseKey, &keyblob, &keyblobsize,
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&base_key_obj, READ_LOCK);
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if (rc != CKR_OK) {
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@@ -5300,6 +5313,13 @@ CK_RV ep11tok_derive_key(STDLL_TokData_t * tokdata, SESSION * session,
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}
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opaque_attr = NULL;
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+ if (mech->mechanism == CKM_IBM_BTC_DERIVE &&
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+ btc_params != NULL && btc_params->pChainCode != NULL &&
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+ cslen >= CK_IBM_BTC_CHAINCODE_LENGTH) {
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+ memcpy(btc_params->pChainCode, csum, CK_IBM_BTC_CHAINCODE_LENGTH);
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+ btc_params->ulChainCodeLen = CK_IBM_BTC_CHAINCODE_LENGTH;
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+ }
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+
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if (mech->mechanism == CKM_IBM_BTC_DERIVE && class == CKO_PUBLIC_KEY) {
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/* Derived blob is an SPKI, extract public EC key attributes */
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rc = ecdsa_priv_unwrap_get_data(key_obj->template,
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--
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2.16.2.windows.1
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