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Add methods for generating RSA Key Pair in synccrypto module

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This commit is contained in:
Prasenjit Kumar Shaw 2019-07-06 19:52:44 +05:30
parent 60b807499b
commit f0e656e719
2 changed files with 57 additions and 0 deletions
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49
src/lib/sync/synccrypto.cpp
View File

@ -20,10 +20,34 @@
#include <nettle/sha2.h>
#include <nettle/hkdf.h>
#include <nettle/hmac.h>
#include <nettle/rsa.h>
#include <nettle/cbc.h>
#include <QByteArray>
#include <QString>
#include <random>
/* This function is required for Nettle's RSA support.
* We are not using random_ctx, instead we are using C++11's <random>'s
* Merseinne Twister.
*/
void generateRandomBytes(void* randomCtx, size_t numBytes, u_char* out)
{
Q_UNUSED(randomCtx);
std::random_device device;
std::mt19937 generator(device());
// Generate a uniform int distribution in range of 0 to 255, that is 8-bit range
std::uniform_int_distribution<std::mt19937::result_type> distribution(0, 255);
for (size_t i = 0; i < numBytes; ++i) {
out[i] = (u_char)distribution(generator);
}
}
u_char *syncCryptoHkdf(QByteArray *in, QByteArray *info, size_t out_len)
{
hmac_sha256_ctx *ctx = new hmac_sha256_ctx;
@ -103,3 +127,28 @@ void deriveKeyFetchToken(QByteArray *keyFetchToken, QByteArray *tokenId, QByteAr
temp2->remove(0, len);
respXORKey->append(*temp2);
}
RSAKeyPair *generateRSAKeyPair()
{
RSAKeyPair *keyPair = new RSAKeyPair();
rsa_public_key publicKey;
rsa_private_key privateKey;
rsa_public_key_init(&publicKey);
rsa_private_key_init(&privateKey);
// Set public key exponent to a small Fermat prime number
mpz_set_ui(publicKey.e, 65537);
// Using key size 2048 for security
int success = rsa_generate_keypair(&publicKey, &privateKey,
NULL, generateRandomBytes,
NULL, NULL, 2048, 0);
Q_ASSERT(success);
keyPair->m_publicKey = publicKey;
keyPair->m_privateKey = privateKey;
return keyPair;
}

8
src/lib/sync/synccrypto.h
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@ -19,10 +19,18 @@
#include <QByteArray>
#include <QString>
#include <nettle/rsa.h>
#define SHA256_DIGEST_SIZE 32
struct RSAKeyPair {
rsa_public_key m_publicKey;
rsa_private_key m_privateKey;
};
void generateRandomBytes(void *randomCtx, size_t numBytes, u_char *out);
u_char *syncCryptoHkdf(QByteArray *in, QByteArray *info, size_t out_len);
void syncCryptoKW(QByteArray *kw, QString name);
void deriveSessionToken(QByteArray *sessionToken, QByteArray *tokenId, QByteArray *reqHMACKey, QByteArray *reqKey);
void deriveKeyFetchToken(QByteArray *keyFetchToken, QByteArray *tokenId, QByteArray *reqHMACKey, QByteArray *respHMACKey, QByteArray *respXORKey);
RSAKeyPair *generateRSAKeyPair();