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common HKDF

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orignal 2019-03-15 12:25:20 -04:00
parent 8ec12a1b65
commit aa4bddd6ec
4 changed files with 37 additions and 16 deletions
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29
libi2pd/Crypto.cpp
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@ -8,11 +8,14 @@
#include <openssl/crypto.h>
#include "TunnelBase.h"
#include <openssl/ssl.h>
#include "Crypto.h"
#if OPENSSL_HKDF
#include <openssl/kdf.h>
#endif
#if !OPENSSL_AEAD_CHACHA20_POLY1305
#include "ChaCha20.h"
#include "Poly1305.h"
#endif
#include "Crypto.h"
#include "Ed25519.h"
#include "I2PEndian.h"
#include "Log.h"
@ -1245,6 +1248,30 @@ namespace crypto
#endif
}
void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info, uint8_t * out)
{
#if OPENSSL_HKDF
EVP_PKEY_CTX * pctx = EVP_PKEY_CTX_new_id (EVP_PKEY_HKDF, NULL);
EVP_PKEY_derive_init (pctx);
EVP_PKEY_CTX_set_hkdf_md (pctx, EVP_sha256());
EVP_PKEY_CTX_set1_hkdf_salt (pctx, salt, 32);
EVP_PKEY_CTX_set1_hkdf_key (pctx, key, keyLen);
if (info.length () > 0)
EVP_PKEY_CTX_add1_hkdf_info (pctx, info.c_str (), info.length ());
size_t outlen = 64;
EVP_PKEY_derive (pctx, out, &outlen);
EVP_PKEY_CTX_free (pctx);
#else
uint8_t prk[32]; unsigned int len;
HMAC(EVP_sha256(), salt, 32, key, keyLen, prk, &len);
auto l = info.length ();
memcpy (out, info.c_str (), l); out[l] = 0x01;
HMAC(EVP_sha256(), prk, 32, out, l + 1, out, &len);
memcpy (out + 32, info.c_str (), l); out[l + 32] = 0x02;
HMAC(EVP_sha256(), prk, 32, out, l + 33, out + 32, &len);
#endif
}
// init and terminate
/* std::vector <std::unique_ptr<std::mutex> > m_OpenSSLMutexes;