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Fix/hkdf null salt openssl3 #76

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Fix/hkdf null salt openssl3 #76

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610caf8
fix: pass empty string instead of nullptr for HKDF salt in exchange t…
seanjin99 Mar 6, 2026
4875870
Update exchange.cpp
seanjin99 Mar 11, 2026
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12 changes: 6 additions & 6 deletions test/main/cpp/exchange.cpp
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/**
* Copyright 2020 Comcast Cable Communications Management, LLC
* Copyright 2020-2026 Comcast Cable Communications Management, LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -393,12 +393,12 @@ static Sec_Result hkdf(SEC_BYTE* key, SEC_SIZE key_len, SEC_BYTE* out, const SEC
return SEC_RESULT_FAILURE;
}

#if OPENSSL_VERSION_NUMBER >= 0x30000000
if (EVP_PKEY_CTX_set1_hkdf_salt(pctx, reinterpret_cast<const unsigned char*>(use_salt ? "salt" : nullptr),
// OpenSSL 3.x OSSL_PARAM_construct_octet_string() rejects NULL data pointer
// even when length is 0, causing EVP_PKEY_CTX_set1_hkdf_salt() to fail.
// Pass "" instead of nullptr to satisfy the non-NULL check.
if (EVP_PKEY_CTX_set1_hkdf_salt(pctx,
reinterpret_cast<const unsigned char*>(use_salt ? "salt" : ""),
use_salt ? 4 : 0) <= 0) {
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@riwoh riwoh Mar 11, 2026

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was this tested on OpenSSL < 0x30000000? Is that compile define no longer needed?

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@seanjin99 seanjin99 Mar 11, 2026

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I guess so, RDK platform only tested 1.0 to 3.0.15 and all passed, however using 3.0.18 it will be failed here. you see I did a bunch test from 1.0 to latest 3.6.1 to make sure the change does not break any openssl version.

#else
if (EVP_PKEY_CTX_set1_hkdf_salt(pctx, use_salt ? "salt" : nullptr, use_salt ? 4 : 0) <= 0) {
#endif
EVP_PKEY_CTX_free(pctx);
return SEC_RESULT_FAILURE;
}
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