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FlashCryptoAdapter_OpenSSL.cpp
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FlashCryptoAdapter_OpenSSL.cpp
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// Copyright © 2021 Michael Thornburgh
// SPDX-License-Identifier: MIT
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/opensslv.h>
#if OPENSSL_VERSION_MAJOR >= 3
// HMAC_* stuff is deprecated in OpenSSL >= 3.0.0
#define FLASHCRYPTO_USE_EVP_MAC 1
#include <openssl/core_names.h>
#else
// The new EVP_MAC stuff doesn't exist in older versions of OpenSSL
#include <openssl/hmac.h>
#define FLASHCRYPTO_USE_EVP_MAC 0
#endif
#include <cstring>
#include "../include/rtmfp/FlashCryptoAdapter_OpenSSL.hpp"
namespace com { namespace zenomt { namespace rtmfp {
namespace {
struct MODP_Group {
int group_id;
const unsigned char *g;
int g_len;
const unsigned char *modulus;
int modulus_len;
int exponent_len_bits;
};
const unsigned char TWO[] = { 2 };
// RFC 7296 §B.2, also RFC 2409 §6.2
const unsigned char MODP_1024[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
// RFC 3526 §3
const unsigned char MODP_2048[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05,
0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB,
0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04,
0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2, 0x8F,
0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18,
0x39, 0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
// RFC 3526 §5
const unsigned char MODP_4096[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05,
0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB,
0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04,
0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2, 0x8F,
0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9, 0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18,
0x39, 0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D, 0x04, 0x50, 0x7A, 0x33,
0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64, 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A,
0x8A, 0xEA, 0x71, 0x57, 0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7,
0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94, 0xE0, 0x4A, 0x25, 0x61, 0x9D,
0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, 0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64,
0xD8, 0x76, 0x02, 0x73, 0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C,
0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, 0xBA, 0xD9, 0x46, 0xE2,
0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31, 0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E,
0x4B, 0x82, 0xD1, 0x20, 0xA9, 0x21, 0x08, 0x01, 0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6, 0xD7,
0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26, 0x99, 0xC3, 0x27, 0x18, 0x6A, 0xF4, 0xE2, 0x3C,
0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B, 0xDA, 0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8,
0xDB, 0xBB, 0xC2, 0xDB, 0x04, 0xDE, 0x8E, 0xF9, 0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA, 0xA6,
0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D, 0x99, 0xB2, 0x96, 0x4F, 0xA0, 0x90, 0xC3, 0xA2,
0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7, 0xED, 0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF,
0xB8, 0x1B, 0xDD, 0x76, 0x21, 0x70, 0x48, 0x1C, 0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A, 0xA9,
0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1, 0x86, 0xFF, 0xB7, 0xDC, 0x90, 0xA6, 0xC0, 0x8F,
0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x06, 0x31, 0x99, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
MODP_Group modp_groups[] = {
{ 16, TWO, sizeof(TWO), MODP_4096, sizeof(MODP_4096), 480 }, // RFC 3526 §5, §8
{ 14, TWO, sizeof(TWO), MODP_2048, sizeof(MODP_2048), 320 }, // RFC 3526 §3, §8
{ 2, TWO, sizeof(TWO), MODP_1024, sizeof(MODP_1024), 224 }, // RFC 7296 §B.2, §5
{ -1, NULL, 0, NULL, 0, 0 }
};
const MODP_Group * findGroupParams(int groupID)
{
for(int i = 0; modp_groups[i].group_id >= 0; i++)
if(groupID == modp_groups[i].group_id)
return &modp_groups[i];
return nullptr;
}
#if FLASHCRYPTO_USE_EVP_MAC
class HMACSHA256_Context_OpenSSL : public HMACSHA256_Context {
public:
~HMACSHA256_Context_OpenSSL()
{
if(m_ctx)
EVP_MAC_CTX_free(m_ctx);
m_ctx = nullptr;
if(m_mac)
EVP_MAC_free(m_mac);
m_mac = nullptr;
memset(m_key.data(), 0x00, m_key.size());
memset(m_key.data(), 0xff, m_key.size());
}
bool init(const void *key_, size_t len) override
{
if(m_mac or m_ctx)
return false;
m_mac = EVP_MAC_fetch(NULL, OSSL_MAC_NAME_HMAC, NULL);
if(not m_mac)
return false;
OSSL_PARAM params[2];
size_t params_n = 0;
params[params_n++] = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, (char *)"SHA256", 0);
params[params_n++] = OSSL_PARAM_construct_end();
// The documentation for the new EVP_MAC functions suggest that the key can
// be re-used (after a re-EVP_MAC_init()), but it doesn't actually work. See
// https://github.com/openssl/openssl/issues/17811 and (older)
// https://github.com/openssl/openssl/issues/11007 .
// So instead we have to remember the key and set it on every use,
// which is more computationally expensive (requires an extra SHA256 per).
const uint8_t *key = (const uint8_t *)key_;
m_key = Bytes(key, key + len);
m_ctx = EVP_MAC_CTX_new(m_mac);
if((not m_ctx) or not EVP_MAC_init(m_ctx, key, len, params))
return false;
return true;
}
bool compute(void *md, const void *msg, size_t len) override
{
if(not EVP_MAC_init(m_ctx, m_key.data(), m_key.size(), NULL))
return false;
size_t outsize = 32;
if( (not EVP_MAC_update(m_ctx, (const unsigned char *)msg, len))
or (not EVP_MAC_final(m_ctx, (unsigned char *)md, &outsize, outsize))
)
return false;
return true;
}
protected:
EVP_MAC *m_mac { nullptr };
EVP_MAC_CTX *m_ctx { nullptr };
Bytes m_key;
};
#else
class HMACSHA256_Context_OpenSSL : public HMACSHA256_Context {
public:
~HMACSHA256_Context_OpenSSL()
{
if(m_ctx)
HMAC_CTX_free(m_ctx);
m_ctx = nullptr;
}
bool init(const void *key, size_t len) override
{
if(m_ctx)
return false;
m_ctx = HMAC_CTX_new();
if((not m_ctx) or (not HMAC_Init_ex(m_ctx, key, (int)len, EVP_sha256(), NULL)))
return false;
m_keyLen = len;
return true;
}
bool compute(void *md, const void *msg, size_t len) override
{
if(m_dirty and not HMAC_Init_ex(m_ctx, NULL, m_keyLen, NULL, NULL))
return false;
m_dirty = true;
if( (not HMAC_Update(m_ctx, (const unsigned char *)msg, (int)len))
or (not HMAC_Final(m_ctx, (unsigned char *)md, NULL))
)
return false;
return true;
}
protected:
HMAC_CTX *m_ctx { nullptr };
size_t m_keyLen { 0 };
bool m_dirty { false };
};
#endif
class AES_Context_OpenSSL : public AES_Context {
public:
AES_Context_OpenSSL() : m_ctx(nullptr)
{ }
~AES_Context_OpenSSL()
{
if(m_ctx)
EVP_CIPHER_CTX_free(m_ctx);
m_ctx = nullptr;
}
bool init(const void *key, size_t len, bool encrypt) override
{
if(m_ctx or 16 != len)
return false;
m_ctx = EVP_CIPHER_CTX_new();
if(not m_ctx)
return false;
if( (not EVP_CipherInit_ex(m_ctx, EVP_aes_128_cbc(), NULL, (const unsigned char *)key, NULL, encrypt ? 1 : 0))
or (not EVP_CIPHER_CTX_set_padding(m_ctx, 0))
)
return false;
return true;
}
bool crypt_cbc(void *dst, const void *src, size_t len, uint8_t *iv) override
{
int outl = (int)len;
if( (not EVP_CipherInit_ex(m_ctx, NULL, NULL, NULL, (const unsigned char *)iv, -1))
or (not EVP_CipherUpdate(m_ctx, (unsigned char *)dst, &outl, (const unsigned char *)src, (int)len))
)
return false;
if(outl != (int)len)
return false;
return true;
}
protected:
EVP_CIPHER_CTX *m_ctx;
};
class DH_Context_OpenSSL : public DH_Context {
public:
DH_Context_OpenSSL() :
m_exponent(nullptr),
m_g(nullptr),
m_modulus(nullptr)
{
}
~DH_Context_OpenSSL()
{
if(m_exponent)
BN_clear_free(m_exponent);
m_exponent = nullptr;
if(m_g)
BN_clear_free(m_g);
m_g = nullptr;
if(m_modulus)
BN_clear_free(m_modulus);
m_modulus = nullptr;
}
bool init(int groupID) override
{
if(m_exponent)
return false;
const MODP_Group *groupParams = findGroupParams(groupID);
if(not groupParams)
return false;
m_exponent = BN_secure_new();
if( (not m_exponent)
or (not BN_rand(m_exponent, groupParams->exponent_len_bits, BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
)
return false;
if( (not (m_g = BN_bin2bn(groupParams->g, groupParams->g_len, NULL)))
or (not (m_modulus = BN_bin2bn(groupParams->modulus, groupParams->modulus_len, NULL)))
or (not modp(m_g, m_public))
)
return false;
return true;
}
Bytes getPublicKey() const override
{
return m_public;
}
bool computeSharedSecret(const void *otherPublic, size_t len, Bytes &dst) const override
{
if(not m_exponent)
return false;
BIGNUM *otherBN = BN_bin2bn((const unsigned char *)otherPublic, (int)len, NULL);
bool rv = otherBN and validate_public(otherBN, otherPublic, len) and modp(otherBN, dst);
if(otherBN)
BN_free(otherBN);
return rv;
}
protected:
// implement §4.6.2 checks on the public key
bool validate_public(BIGNUM *p, const void *pBytes_, size_t pLen) const
{
const uint8_t *pBytes = (const uint8_t *)pBytes_;
bool rv = true;
unsigned char TWO_TO_24TH[] = { 1, 0, 0, 0 };
BIGNUM *two_to_24th_bn = BN_bin2bn(TWO_TO_24TH, sizeof(TWO_TO_24TH), NULL);
BIGNUM *cutoff = BN_new();
if((not cutoff) or (not two_to_24th_bn) or not BN_sub(cutoff, m_modulus, two_to_24th_bn))
{
// BN_sub should not fail, but we're always supposed to check
BN_free(cutoff);
BN_free(two_to_24th_bn);
return false;
}
if(BN_cmp(p, two_to_24th_bn) < 0)
rv = false; // must be at least 2^24
if(BN_cmp(p, cutoff) > 0)
rv = false; // must be at most modulus minus 2^24
size_t num0 = 0;
size_t num1 = 0;
for(size_t i = 0; i < pLen; i++)
{
uint8_t b = pBytes[i];
for(int bit = 0; bit < 8; bit++)
{
if(b & 1)
num1++;
else if(num1) // don't count leading 0s
num0++;
b >>= 1;
}
}
if(num0 < 16)
rv = false;
if(num1 < 16)
rv = false;
BN_free(cutoff);
BN_free(two_to_24th_bn);
return rv;
}
bool modp(BIGNUM *b, Bytes &dst) const
{
bool rv = false;
int resultLen;
BIGNUM *result = BN_secure_new();
BN_CTX *ctx = BN_CTX_secure_new();
if((not result) or (not ctx) or not BN_mod_exp(result, b, m_exponent, m_modulus, ctx))
goto finish;
resultLen = BN_num_bytes(result);
dst.resize(resultLen);
BN_bn2bin(result, (unsigned char *)dst.data());
rv = true;
finish:
if(result)
BN_clear_free(result);
if(ctx)
BN_CTX_free(ctx);
return rv;
}
Bytes m_public;
BIGNUM *m_exponent;
BIGNUM *m_g;
BIGNUM *m_modulus;
};
}
// --- FlashCryptoAdapter_OpenSSL
void FlashCryptoAdapter_OpenSSL::pseudoRandomBytes(uint8_t *dst, size_t len)
{
RAND_bytes(dst, (int)len);
}
std::vector<int> FlashCryptoAdapter_OpenSSL::getSupportedDHGroups() const
{
std::vector<int> rv;
for(int i = 0; modp_groups[i].group_id >= 0; i++)
rv.push_back(modp_groups[i].group_id);
return rv;
}
void FlashCryptoAdapter_OpenSSL::sha256(void *dst, const void *msg, size_t len) const
{
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
EVP_DigestInit_ex(ctx, EVP_sha256(), NULL);
EVP_DigestUpdate(ctx, msg, len);
EVP_DigestFinal_ex(ctx, (unsigned char *)dst, NULL);
EVP_MD_CTX_free(ctx);
}
std::shared_ptr<HMACSHA256_Context> FlashCryptoAdapter_OpenSSL::makeHMAC_Context()
{
return share_ref(new HMACSHA256_Context_OpenSSL(), false);
}
std::shared_ptr<AES_Context> FlashCryptoAdapter_OpenSSL::makeAES_Context()
{
return share_ref(new AES_Context_OpenSSL(), false);
}
std::shared_ptr<DH_Context> FlashCryptoAdapter_OpenSSL::makeDH_Context()
{
return share_ref(new DH_Context_OpenSSL(), false);
}
} } } // namespace com::zenomt::rtmfp