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common HKDF context for ratchets tags

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orignal
2026-08-08 16:52:28 -04:00
parent cfcc88029c
commit e32e694a83
6 changed files with 77 additions and 45 deletions
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libi2pd/Crypto.cpp
+26 -10
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@@ -779,26 +779,42 @@ namespace crypto
void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, std::string_view info,
uint8_t * out, size_t outLen)
{
EVP_PKEY_CTX * pctx = EVP_PKEY_CTX_new_id (EVP_PKEY_HKDF, nullptr);
EVP_PKEY_derive_init (pctx);
EVP_PKEY_CTX_set_hkdf_md (pctx, EVP_sha256());
HKDFContext ctx;
ctx (salt, key, keyLen, info, out, outLen);
}
HKDFContext::HKDFContext ()
{
m_Ctx = EVP_PKEY_CTX_new_id (EVP_PKEY_HKDF, nullptr);
}
HKDFContext::~HKDFContext ()
{
if (m_Ctx)
EVP_PKEY_CTX_free (m_Ctx);
}
void HKDFContext::operator ()(const uint8_t * salt, const uint8_t * key, size_t keyLen,
std::string_view info, uint8_t * out, size_t outLen)
{
EVP_PKEY_derive_init (m_Ctx);
EVP_PKEY_CTX_set_hkdf_md (m_Ctx, EVP_sha256());
if (key && keyLen)
{
EVP_PKEY_CTX_set1_hkdf_salt (pctx, salt, 32);
EVP_PKEY_CTX_set1_hkdf_key (pctx, key, keyLen);
EVP_PKEY_CTX_set1_hkdf_salt (m_Ctx, salt, 32);
EVP_PKEY_CTX_set1_hkdf_key (m_Ctx, key, keyLen);
}
else
{
// zerolen
EVP_PKEY_CTX_hkdf_mode (pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY);
EVP_PKEY_CTX_hkdf_mode (m_Ctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY);
uint8_t tempKey[32]; unsigned int len;
HMAC(EVP_sha256(), salt, 32, nullptr, 0, tempKey, &len);
EVP_PKEY_CTX_set1_hkdf_key (pctx, tempKey, len);
EVP_PKEY_CTX_set1_hkdf_key (m_Ctx, tempKey, len);
}
if (info.length () > 0)
EVP_PKEY_CTX_add1_hkdf_info (pctx, (const uint8_t *)info.data (), info.length ());
EVP_PKEY_derive (pctx, out, &outLen);
EVP_PKEY_CTX_free (pctx);
EVP_PKEY_CTX_add1_hkdf_info (m_Ctx, (const uint8_t *)info.data (), info.length ());
EVP_PKEY_derive (m_Ctx, out, &outLen);
}
// Noise