Background
I am trying to verify signature of a given binary file using openssl. Actual signing of binary hash is done by a 3rd party. Both 3rd party and I have the same exact certificate - they sent me the certificate.
I have verified health of my certificate by running openssl x509 -noout -text -inform DER -in CERT_PATH. This displays contents of cert correctly.
Following is my code so far - I based it on openssl wiki example here:
static std::vector<char> ReadAllBytes(char const* filename){
std::ifstream ifs(filename, std::ios::binary|std::ios::ate);
std::ifstream::pos_type pos = ifs.tellg();
std::vector<char> result(pos);
ifs.seekg(0, std::ios::beg);
ifs.read(result.data(), pos);
return result;
}
int main(int ac, const char * av[]) {
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
// most of error check omitted for brevity
auto foundBinBytes = ReadAllBytes("BINARY_PATH");
auto foundSgnBytes = ReadAllBytes("SIGNATURE_PATH");
auto foundCertBytes = ReadAllBytes("CERT_PATH");
ERR_clear_error();
BIO *b = NULL;
X509 *c;
b = BIO_new_mem_buf(reinterpret_cast<const unsigned char *>(foundCertBytes.data()), foundCertBytes.size());
c = d2i_X509_bio(b, NULL);
EVP_MD_CTX* ctx = NULL;
ctx = EVP_MD_CTX_create();
const EVP_MD* md = EVP_get_digestbyname("SHA256");
int rc = EVP_DigestInit_ex(ctx, md, NULL);
EVP_PKEY *k = NULL;
k = X509_get_pubkey(c);
rc = EVP_DigestVerifyInit(ctx, NULL, md, NULL, k);
rc = EVP_DigestVerifyUpdate(ctx, reinterpret_cast<const unsigned char *>(foundBinBytes.data()), foundBinBytes.size());
ERR_clear_error();
rc = EVP_DigestVerifyFinal(ctx, reinterpret_cast<const unsigned char *>(foundSgnBytes.data()), foundSgnBytes.size());
ERR_print_errors_fp( stdout );
// openssl free functions omitted
if(ctx) {
EVP_MD_CTX_destroy(ctx);
ctx = NULL;
}
return 0;
}
Issue
Running this code produces following errors:
4511950444:error:0D07207B:asn1 encoding routines:ASN1_get_object:header too long:/.../crypto/asn1/asn1_lib.c:152:
4511950444:error:0D068066:asn1 encoding routines:ASN1_CHECK_TLEN:bad object header:/.../crypto/asn1/tasn_dec.c:1152:
4511950444:error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error:/.../crypto/asn1/tasn_dec.c:314:Type=X509_SIG
Question
What is wrong with my setup/code? Did I miss something along the way?
You never check the errors when reading the files. You might have errors there (does the file "CERT_PATH" exist? Do you have read permissions? ...).
If "CERT_PATH" cannot be read, then foundCertBytes.data() is an empty byte array, and this explains the subsequent errors.
If you get these errors in a mosquitto secured server's log, check the config file.
My mosquitto.conf was containing :
require_certificate true
my meross device doesn't send certificate. Turning this to "false" solved my problem after restart
Related
I'm trying to create self-signed request with subjectAltName from c++ code (trying to implement dynamic self-signed certificates like this to actual version of OpenResty, but there is not sollution for subjectAltName).
Please, provide some examples of setting SANs from C++/OpenSSL code. I trying some like this:
X509_EXTENSION *ext;
STACK_OF (X509_EXTENSION) * extlist;
char *ext_name = "subjectAltName";
char *ext_value = "DNS:lohsport.com";
extlist = sk_X509_EXTENSION_new_null ();
ext = X509V3_EXT_conf (NULL, NULL, ext_name, ext_value);
if(ext == NULL)
{
*err = "Error creating subjectAltName extension";
goto failed;
}
sk_X509_EXTENSION_push (extlist, ext);
if (!X509_REQ_add_extensions (x509_req, extlist)){
*err = "Error adding subjectAltName to the request";
goto failed;
}
sk_X509_EXTENSION_pop_free (extlist, X509_EXTENSION_free);
It's compiling successfully but not works.
I would be grateful for any help.
UPDATE
Now i trying to work as in selfsing.c demo of OpenSSL Library:
1) I defined a function for adding extensions to CSR:
int add_ext(STACK_OF(X509_EXTENSION) *sk, int nid, char *value)
{
X509_EXTENSION *ex;
ex = X509V3_EXT_conf_nid(NULL, NULL, nid, value);
if (!ex)
return 0;
sk_X509_EXTENSION_push(sk, ex);
return 1;
}
2) Add this block to my function which generates CSR:
char Buffer[512];
// Format the value
sprintf (Buffer, "DNS:%s", info->common_name);
xts = sk_X509_EXTENSION_new_null();
add_ext(exts, NID_subject_alt_name, Buffer);
if(X509_REQ_add_extensions(x509_req, exts) != 1) {
*err = "X509_REQ_add_extensions() failed";
goto failed;
}
sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
The code again compiles correctly, certificates are generated on the fly, but alternative names still don't work, and I get an error in the browser:
NET :: ERR_CERT_COMMON_NAME_INVALID
and I don’t see the alternative name information in the certificate details.
What other solutions can there be for a SAN problem? I can provide all the code for example on githab if it can help.
Hello I have done something like that (but I am working with X509 object not X509_REQ object like you :
static int cs_cert_set_subject_alt_name(X509 *x509_cert)
{
char *subject_alt_name = "IP: 192.168.1.1";
X509_EXTENSION *extension_san = NULL;
ASN1_OCTET_STRING *subject_alt_name_ASN1 = NULL;
int ret = -1;
subject_alt_name_ASN1 = ASN1_OCTET_STRING_new();
if (!subject_alt_name_ASN1) {
goto err;
}
ASN1_OCTET_STRING_set(subject_alt_name_ASN1, (unsigned char*) subject_alt_name, strlen(subject_alt_name));
if (!X509_EXTENSION_create_by_NID(&extension_san, NID_subject_alt_name, 0, subject_alt_name_ASN1)) {
goto err;
}
ASN1_OCTET_STRING_free(subject_alt_name_ASN1);
ret = X509_add_ext(x509_cert, extension_san, -1);
if (!ret) {
goto err;
}
X509_EXTENSION_free(extension_san);
err:
if (subject_alt_name_ASN1) ASN1_OCTET_STRING_free(subject_alt_name_ASN1);
if (extension_san) X509_EXTENSION_free(extension_san);
return -1;
}
It worked for me for the moment, I still have some trouble when I want to update an already existing certificate with a new subject alt name (because of a new ip address).
To see the result and check if the subject alt name is made :
$ openssl x509 -text -in cert.pem
Instead of X509V3_EXT_conf function try with X509V3_EXT_conf_nid function in which you pass the NID instead of name.
ext = X509V3_EXT_conf (NULL, NULL, ext_name, ext_value);
can be
ext = X509V3_EXT_conf_nid(NULL, NULL, NID_subject_alt_name, ext_value);
Your code might not be working because you might not be exactly matching the extension name with the one in OpenSSL code.
Getting this very annoying error. error:0906D06C:PEM routines:PEM_read_bio:no start
Code:
RSA* publickey = cWrapper.getPublicKey("C:/rsa-stuff/public.pem");
QByteArray plain = "The man in the black fled into the desert and the gunslinger followed...";
QByteArray encrypted = cWrapper.encryptRSA(publickey, plain);
In encryptRSA():
const char* publicKeyStr = data.constData();
qDebug() << publicKeyStr;
BIO* bio = BIO_new_mem_buf((void*)publicKeyStr, -1);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
RSA* rsaPubKey = PEM_read_bio_RSAPublicKey(bio, NULL, NULL, NULL);
if(!rsaPubKey) {
qDebug() << "Could not load public key, " << ERR_error_string(ERR_get_error(), NULL); // error is here
}
BIO_free(bio);
This is how I read file:
QByteArray data;
QFile file(filename);
if(!file.open(QFile::ReadOnly))
{
printf("Error reading file: %s\n", file.errorString());
return data;
}
data = file.readAll();
file.close();
return data;
When I print out publicKeyStr, looks fine. This is notepad++ view with all characters enabled:
Anyone know what I am doing wrong? Super annoying issue :(
First of all, it's not this problem because I don't get the trusted part. Anyhow, I did try all the "solutions" and none of them worked, same error.
Your RSA public key is in SubjectPublicKeyInfo PEM format, but you are trying to read it using PEM_read_bio_RSAPublicKey which tries to read a PEM RSA key in PKCS#1 format. Try using PEM_read_bio_RSA_PUBKEY instead.
https://www.openssl.org/docs/man1.1.0/crypto/PEM_read_bio_RSAPublicKey.html
I got that same error on an openSSL1.1.0f I ported. The error showed up in my logger when reading out the root certificate from an mqtt client connection, until I figured out that I had forwarded the ERR_put_error() directly to my logger, whereas in openssl - the "real" error handling is kept in an ERR_STATE error buffer, and so sometimes (like in this case), errors are "expected", and the ERR_STATE error buffer is cleared (before anyone should check it).
in crypto/pem/pem_info.c, line 65:
i = PEM_read_bio(bp, &name, &header, &data, &len);
if (i == 0) {
error = ERR_GET_REASON(ERR_peek_last_error());
if (error == PEM_R_NO_START_LINE) {
ERR_clear_error();
break;
}
goto err;
meaning it runs througth the BIO_gets inside the PEM_read_bio until it returns zero, and if you get this PEM_R_NO_START_LINE, then thats just a way of saying its done.
By that time though, the error had already landed in my logger. So for anyone being confused by errors he or she is forwarding directly from ERR_put_error, use the ERR_print_errors_fp(stderr); in your errorhandling routine instead. In my case, as I dont have a stderr, I made a patched version of it, like:
void errorhandling()
{
unsigned long l;
char buf[256];
const char *file, *data;
int line, flags;
while ((l = ERR_get_error_line_data(&file, &line, &data, &flags)) != 0)
{
ERR_error_string_n(l, buf, sizeof buf);
printf("%s:%s:%d:%s\n", buf, file, line, (flags & ERR_TXT_STRING) ? data : "");
}
}
I'm trying to generate a RSA Signature with libopenssl for c++:
But when I run my code, I get a SIGABRT. I did some deep debugging into libopenssl internal stuff to see where the Segfault comes from. I'll come to this later on.
First I want to make clear, that the RSA PrivateKey was successfully loaded from a .pem file. So Im pretty sure that's not the problem's origin.
So my question is: How to avoid the SIGABRT and what is the cause of it ?
I'm doing this for my B.Sc. Thesis so I really appreciate your help :)
Signature Generation Function:
DocumentSignature* RSASignatureGenerator::generateSignature(ContentHash* ch, CryptographicKey* pK) throw(PDVSException) {
OpenSSL_add_all_algorithms();
OpenSSL_add_all_ciphers();
OpenSSL_add_all_digests();
if(pK == nullptr)
throw MissingPrivateKeyException();
if(pK->getKeyType() != CryptographicKey::KeyType::RSA_PRIVATE || !dynamic_cast<RSAPrivateKey*>(pK))
throw KeyTypeMissmatchException(pK->getPem()->getPath().string(), "Generate RSA Signature");
//get msg to encrypt
const char* msg = ch->getStringHash().c_str();
//get openssl rsa key
RSA* rsaPK = dynamic_cast<RSAPrivateKey*>(pK)->createOpenSSLRSAKeyObject();
//create openssl signing context
EVP_MD_CTX* rsaSignCtx = EVP_MD_CTX_create();
EVP_PKEY* priKey = EVP_PKEY_new();
EVP_PKEY_assign_RSA(priKey, rsaPK);
//init ctxt
if (EVP_SignInit(rsaSignCtx, EVP_sha256()) <=0)
throw RSASignatureGenerationException();
//add data to sign
if (EVP_SignUpdate(rsaSignCtx, msg, std::strlen(msg)) <= 0) {
throw RSASignatureGenerationException();
}
//create result byte signature struct
DocumentSignature::ByteSignature* byteSig = new DocumentSignature::ByteSignature();
//set size to max possible
byteSig->size = EVP_MAX_MD_SIZE;
//alloc buffer memory
byteSig->data = (unsigned char*)malloc(byteSig->size);
//do signing
if (EVP_SignFinal(rsaSignCtx, byteSig->data, (unsigned int*) &byteSig->size, priKey) <= 0)
throw RSASignatureGenerationException();
DocumentSignature* res = new DocumentSignature(ch);
res->setByteSignature(byteSig);
EVP_MD_CTX_destroy(rsaSignCtx);
//TODO open SSL Memory leaks -> where to free open ssl stuff?!
return res;
}
RSA* rsaPK = dynamic_cast(pK)->createOpenSSLRSAKeyObject();
virtual RSA* createOpenSSLRSAKeyObject() throw (PDVSException) override {
RSA* rsa = NULL;
const char* c_string = _pem->getContent().c_str();
BIO * keybio = BIO_new_mem_buf((void*)c_string, -1);
if (keybio==NULL)
throw OpenSSLRSAPrivateKeyObjectCreationException(_pem->getPath());
rsa = PEM_read_bio_RSAPrivateKey(keybio, &rsa, NULL, NULL);
if(rsa == nullptr)
throw OpenSSLRSAPrivateKeyObjectCreationException(_pem->getPath());
//BIO_free(keybio);
return rsa;
}
SigAbrt origin in file openssl/crypto/mem.c
void CRYPTO_free(void *str, const char *file, int line)
{
if (free_impl != NULL && free_impl != &CRYPTO_free) {
free_impl(str, file, line);
return;
}
#ifndef OPENSSL_NO_CRYPTO_MDEBUG
if (call_malloc_debug) {
CRYPTO_mem_debug_free(str, 0, file, line);
free(str);
CRYPTO_mem_debug_free(str, 1, file, line);
} else {
free(str);
}
#else
free(str); // <<<<<<< HERE
#endif
}
the stacktrace
stacktrace screenshot from debugger (clion - gdb based)
I just found the Bug (and Im really not sure if this is a libopenssl bug..)
//set size to max possible
byteSig->size = EVP_MAX_MD_SIZE;
//alloc buffer memory
byteSig->data = (unsigned char*)malloc(byteSig->size);
The problem was when I set the buffer size to EVP_MAX_MD_SIZE!
The (in my opinion) very very strange thing is, that you have to keep the size uninitialized! (not even set to 0 - just "size_t size;" ).
Strange thing here is that then you also HAVE TO allocate memory just like I did. I dont understand this because then an undefined size of memory gets allocated..
What the really weird is that libopenssl internally sets the size back to 0 and allocates the memory itself.. (I detected this by browsing the libopenssl source code)
I am writing some code to RSA sign data. I have gotten this code to work successfully on Ubuntu (OpenSSL version is 1.0.1f-1ubuntu2.7). The code takes the message, and produces the signed result with the private key, I can verify is correct using a separate program and the matching public key.
Under windows, the exact same code produces a different result, the signed data is different (And does not verify. I can't figure out why. I am using the OpenSSL distribution 'Win64OpenSSL-1_0_1j' from http://slproweb.com/products/Win32OpenSSL.html .
Here is the code:
const char * rsa_pri_key = "-----BEGIN RSA PRIVATE KEY-----\n"
"MII...L1t\n"
"yC0...+zk\n"
"c0...5Q\n"
"-----END RSA PRIVATE KEY-----\n";
BIO* bio = BIO_new_mem_buf( (void*)rsa_pri_key, -1 );
BIO_set_flags( bio, BIO_FLAGS_BASE64_NO_NL );
RSA* private_key = PEM_read_bio_RSAPrivateKey(bio, NULL, NULL, NULL ) ;
if( !private_key )
{
std::cout << "Key load failed" << std::endl;
}
BIO_free( bio ) ;
// Sign the data
signature = (unsigned char*) malloc(RSA_size(private_key));
RSA_sign(NID_md5, (unsigned char*) message, strlen(message), signature, &slen, private_key)
I think the issue might be related to the char type on Linux and windows differing in whether they're signed or not. You're casting to (unsigned char *) which might be where the issue arises.
As the title says, I have some code that generates a pair of RSA keys. I want to split them apart and use them individually to encrypt/decrypt, rather than use the variable "keypair" to encrypt, and decrypt.
I am working to transfer data across a network, and want to encrypt it using simple RSA encryption. Therefore i want to send the public key over to a different user, so he can use it to encrypt some data, and then send it back to me.
Here is the code that generates the keys:
//Generate key pair
RSA *keypair = RSA_generate_key(KEY_LENGTH, PUB_EXP, NULL, NULL);
I now want to separate the public from the private key, so i can use them independently to encrypt and decrypt data. How can i do that?
I've got some code that takes the "keypair" and extracts some information into some "BIO" variables, although i am not sure how that would help me:
// To get the C-string PEM form:
BIO *pri = BIO_new(BIO_s_mem());
BIO *pub = BIO_new(BIO_s_mem());
PEM_write_bio_RSAPrivateKey(pri, keypair, NULL, NULL, 0, NULL, NULL);
PEM_write_bio_RSAPublicKey(pub, keypair);
pri_len = BIO_pending(pri);
pub_len = BIO_pending(pub);
pri_key = (char*)malloc(pri_len + 1);
pub_key = (char*)malloc(pub_len + 1);
BIO_read(pri, pri_key, pri_len);
BIO_read(pub, pub_key, pub_len);
pri_key[pri_len] = '\0';
pub_key[pub_len] = '\0';
#ifdef PRINT_KEYS
printf("\n%s\n%s\n", pri_key, pub_key);
#endif
printf("done.\n");
This code works, since i've tested it in visual studio 2012.
Any ideas on how to separate the keys, then maybe put them back together in a "keypair" or maybe how to use them separately to encrypt/decrypt some string variables?
Thank you
(FULL CODE)
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <stdio.h>
#include <string.h>
#define KEY_LENGTH 2048
#define PUB_EXP 3
#define PRINT_KEYS
#define WRITE_TO_FILE
int main() {
size_t pri_len; // Length of private key
size_t pub_len; // Length of public key
char *pri_key; // Private key
char *pub_key; // Public key
char msg[KEY_LENGTH/8]; // Message to encrypt
char *encrypt = NULL; // Encrypted message
char *decrypt = NULL; // Decrypted message
char *err; // Buffer for any error messages
//Generate key pair
RSA *keypair = RSA_generate_key(KEY_LENGTH, PUB_EXP, NULL, NULL);
// To get the C-string PEM form:
BIO *pri = BIO_new(BIO_s_mem());
BIO *pub = BIO_new(BIO_s_mem());
PEM_write_bio_RSAPrivateKey(pri, keypair, NULL, NULL, 0, NULL, NULL);
PEM_write_bio_RSAPublicKey(pub, keypair);
pri_len = BIO_pending(pri);
pub_len = BIO_pending(pub);
pri_key = (char*)malloc(pri_len + 1);
pub_key = (char*)malloc(pub_len + 1);
BIO_read(pri, pri_key, pri_len);
BIO_read(pub, pub_key, pub_len);
pri_key[pri_len] = '\0';
pub_key[pub_len] = '\0';
#ifdef PRINT_KEYS
printf("\n%s\n%s\n", pri_key, pub_key);
#endif
printf("done.\n");
// Get the message to encrypt
printf("Message to encrypt: ");
fgets(msg, KEY_LENGTH-1, stdin);
msg[strlen(msg)-1] = '\0';
// Encrypt the message
encrypt = (char*)malloc(RSA_size(keypair));
int encrypt_len;
err = (char*)malloc(130);
if((encrypt_len = RSA_public_encrypt(strlen(msg)+1, (unsigned char*)msg, (unsigned char*)encrypt, keypair, RSA_PKCS1_OAEP_PADDING)) == -1) {
ERR_load_crypto_strings();
ERR_error_string(ERR_get_error(), err);
fprintf(stderr, "Error encrypting message: %s\n", err);
goto free_stuff;
}
// Decrypt it
decrypt = (char*)malloc(encrypt_len);
if(RSA_private_decrypt(encrypt_len, (unsigned char*)encrypt, (unsigned char*)decrypt, keypair, RSA_PKCS1_OAEP_PADDING) == -1) {
ERR_load_crypto_strings();
ERR_error_string(ERR_get_error(), err);
fprintf(stderr, "Error decrypting message: %s\n", err);
goto free_stuff;
}
printf("Decrypted message: %s\n", decrypt);
getchar();
//printf("%s", pub_key);
free_stuff:
RSA_free(keypair);
BIO_free_all(pub);
BIO_free_all(pri);
free(pri_key);
free(pub_key);
free(encrypt);
free(decrypt);
free(err);
}
Found this code here : https://shanetully.com/2012/04/simple-public-key-encryption-with-rsa-and-openssl/
I want to split [the keypair] apart and use them individually to encrypt/decrypt
... Any ideas on how to separate the keys, then maybe put them back together in a "keypair" or maybe how to use them separately to encrypt/decrypt some string variables?
You can use RSAPublicKey_dup and RSAPrivateKey_dup, without the need to round trip them by ASN.1/DER or PEM encoding them. Here, round tripping consist of using a functions like PEM_write_bio_RSAPublicKey and PEM_read_bio_RSAPublicKey.
Below is a sample program that uses them. Its written in C++ (thanks for adding that tag).
While you can separate them, they both use the RSA structure. The public key has some members set to NULL, like the private exponent.
You can also print the keys with RSA_print, RSA_print_fp and friends. See RSA_print (3) or its use below.
// g++ -Wall -Wextra -std=c++11 -stdlib=libc++ -I/usr/local/ssl/macosx-x64/include \
// t.cpp -o t.exe /usr/local/ssl/macosx-x64/lib/libcrypto.a
#include <memory>
using std::unique_ptr;
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <cassert>
#define ASSERT assert
using BN_ptr = std::unique_ptr<BIGNUM, decltype(&::BN_free)>;
using RSA_ptr = std::unique_ptr<RSA, decltype(&::RSA_free)>;
int main(int argc, char* argv[])
{
int rc;
RSA_ptr rsa(RSA_new(), ::RSA_free);
BN_ptr bn(BN_new(), ::BN_free);
rc = BN_set_word(bn.get(), RSA_F4);
ASSERT(rc == 1);
rc = RSA_generate_key_ex(rsa.get(), 2048, bn.get(), NULL);
ASSERT(rc == 1);
RSA_ptr rsa_pub(RSAPublicKey_dup(rsa.get()), ::RSA_free);
RSA_ptr rsa_priv(RSAPrivateKey_dup(rsa.get()), ::RSA_free);
fprintf(stdout, "\n");
RSA_print_fp(stdout, rsa_pub.get(), 0);
fprintf(stdout, "\n");
RSA_print_fp(stdout, rsa_priv.get(), 0);
return 0;
}
Here is the output:
$ ./t.exe
Public-Key: (2048 bit)
Modulus:
00:aa:5a:cc:30:52:f1:e9:49:3d:a6:25:00:33:29:
a6:fa:f7:53:e0:3c:73:4c:91:41:66:20:ec:62:1f:
27:2a:2a:6c:0f:90:f8:d9:7e:d5:ec:72:7b:38:8c:
ca:12:60:f8:d1:fb:f2:65:7c:b1:3a:b6:4e:26:ba:
5b:86:cc:30:f2:fc:be:c3:a2:00:b9:ea:81:fa:1c:
22:4e:f7:be:a1:1a:66:90:13:b6:12:66:26:23:6d:
22:15:7d:3b:a4:99:44:38:fa:1c:70:63:4e:50:6f:
66:38:6c:f6:1a:13:e1:c7:dc:a6:a1:eb:6f:f9:c9:
59:c8:30:dc:c2:1b:dc:6c:9d:ea:0c:3d:52:5a:00:
ea:c9:c9:85:51:21:9f:ec:95:b3:dc:c2:50:21:29:
c2:64:6c:1e:34:36:d8:61:59:ab:3c:a2:cc:e8:ef:
57:c3:7f:49:86:be:e3:42:88:1b:39:10:b8:2f:fa:
81:ef:a0:94:99:0c:71:ae:1e:82:7f:e3:6e:00:6e:
02:13:66:bb:a9:31:58:ec:90:39:9c:bc:9c:8c:90:
e9:20:f7:20:8e:d6:a3:a3:df:a2:4a:0f:0f:39:b5:
57:b9:ef:6a:27:e0:1a:ed:f6:ce:0d:87:cd:43:03:
bf:67:ef:ff:fd:da:98:cc:22:ab:5e:8d:7b:43:d3:
90:4d
Exponent: 65537 (0x10001)
Private-Key: (2048 bit)
modulus:
00:aa:5a:cc:30:52:f1:e9:49:3d:a6:25:00:33:29:
a6:fa:f7:53:e0:3c:73:4c:91:41:66:20:ec:62:1f:
27:2a:2a:6c:0f:90:f8:d9:7e:d5:ec:72:7b:38:8c:
ca:12:60:f8:d1:fb:f2:65:7c:b1:3a:b6:4e:26:ba:
5b:86:cc:30:f2:fc:be:c3:a2:00:b9:ea:81:fa:1c:
22:4e:f7:be:a1:1a:66:90:13:b6:12:66:26:23:6d:
22:15:7d:3b:a4:99:44:38:fa:1c:70:63:4e:50:6f:
66:38:6c:f6:1a:13:e1:c7:dc:a6:a1:eb:6f:f9:c9:
59:c8:30:dc:c2:1b:dc:6c:9d:ea:0c:3d:52:5a:00:
ea:c9:c9:85:51:21:9f:ec:95:b3:dc:c2:50:21:29:
c2:64:6c:1e:34:36:d8:61:59:ab:3c:a2:cc:e8:ef:
57:c3:7f:49:86:be:e3:42:88:1b:39:10:b8:2f:fa:
81:ef:a0:94:99:0c:71:ae:1e:82:7f:e3:6e:00:6e:
02:13:66:bb:a9:31:58:ec:90:39:9c:bc:9c:8c:90:
e9:20:f7:20:8e:d6:a3:a3:df:a2:4a:0f:0f:39:b5:
57:b9:ef:6a:27:e0:1a:ed:f6:ce:0d:87:cd:43:03:
bf:67:ef:ff:fd:da:98:cc:22:ab:5e:8d:7b:43:d3:
90:4d
publicExponent: 65537 (0x10001)
privateExponent:
66:a4:ce:e3:4f:16:f3:b9:6d:ab:ee:1f:70:b4:68:
28:4f:5d:fa:7e:71:fa:70:8b:37:3e:1f:30:00:15:
59:12:b6:89:aa:90:46:7c:65:e9:52:11:6c:c1:68:
00:2a:ed:c1:98:4d:35:59:2c:70:73:e8:22:ed:a6:
b8:51:d0:2c:98:9d:58:c3:04:2d:01:5f:cf:93:a4:
18:70:ae:2b:e3:fc:68:53:78:21:1d:eb:5c:ed:24:
dc:4d:d8:e2:14:77:46:dd:6c:c5:4b:10:a4:e6:7a:
71:05:36:44:00:36:ca:75:e8:f1:27:2b:11:16:81:
42:5e:2e:a5:c6:a3:c9:cd:60:59:ce:72:71:76:c8:
ca:ba:f0:45:c3:86:07:7b:22:20:c4:74:c6:a8:ab:
7c:2c:f8:de:ea:25:95:81:79:33:54:67:7b:61:91:
80:a8:1f:4c:38:32:d4:4d:2e:a8:7d:9b:d4:1a:3e:
6b:ca:50:3c:a0:61:0e:00:ad:f4:5c:0f:26:1a:59:
00:3c:bd:ee:c3:e8:d0:b8:9b:0e:44:89:49:d1:24:
a4:39:15:dc:0e:c5:d5:41:a2:4a:f4:e5:e3:23:c7:
98:8a:87:f7:18:a6:e2:7b:27:83:f6:fb:62:42:46:
ae:de:ba:48:ad:07:39:40:da:65:17:d1:d2:ed:df:
01
prime1:
00:dd:dc:70:b5:70:ea:10:20:28:40:a0:c3:b8:70:
6d:3d:84:c0:57:2d:69:fc:e9:d4:55:ed:4f:ac:3d:
c2:e9:19:49:f0:ab:c6:bd:99:9e:0f:e5:a4:61:d4:
b3:c5:c2:b1:e4:3a:10:ff:e6:cd:ce:6e:2d:93:bc:
87:12:92:87:7c:d3:dd:bc:32:54:9e:fa:67:b1:9d:
e2:27:53:e6:03:a7:22:17:45:63:0d:42:f3:96:5d:
a3:e0:9c:93:f0:42:8b:bb:95:34:e6:f6:0b:f7:b6:
c5:59:a0:b5:2a:71:59:c0:f2:7e:bf:95:2d:dd:6d:
94:23:2a:95:4a:4f:f1:d0:93
prime2:
00:c4:91:6a:33:1b:db:24:eb:fd:d3:69:e9:3c:e2:
a2:2d:23:7a:92:65:a8:a0:50:1d:0a:2b:b4:f0:64:
e4:40:57:f3:dc:f7:65:18:7d:51:75:73:b9:d6:67:
9b:0e:94:5f:37:02:6c:7f:eb:b9:13:4b:bf:8e:65:
22:0b:2c:c6:8d:2a:a2:88:ec:21:e3:f9:0b:78:b4:
1d:d0:44:e6:36:0d:ec:3c:8f:0a:c7:3b:0d:91:65:
b7:de:a3:c9:a3:2a:8c:7f:1f:a1:d2:6e:9b:ee:23:
78:c1:30:76:87:af:a8:11:a4:15:b4:54:16:d8:94:
71:5c:64:30:43:58:b5:07:9f
exponent1:
2f:91:e8:88:be:e1:30:fb:f4:25:87:52:ef:e5:0b:
47:39:83:94:2d:a4:a0:19:f2:f1:49:a4:df:a5:8e:
79:34:76:ea:27:aa:c1:54:82:d3:9d:c5:95:44:6a:
17:69:1b:83:77:ff:d5:1e:c3:da:13:3d:aa:83:ad:
e2:89:90:8b:6f:52:07:dc:32:d0:b3:98:30:39:4e:
18:68:a0:d4:ff:ad:0b:98:51:18:b2:d6:4f:d3:5c:
23:f8:ee:af:81:55:3c:af:4d:5c:88:3d:20:ac:0b:
bc:9f:fc:b8:50:fd:91:a5:6d:0f:df:08:aa:85:a8:
51:b1:fb:b8:a7:53:8e:09
exponent2:
7d:46:0b:7f:ad:06:19:de:c8:b2:7e:f2:25:5a:6e:
6f:04:08:6e:da:99:00:2a:6e:87:77:d9:65:c7:76:
ec:46:e1:64:f6:ca:18:34:6d:c0:c3:d3:31:00:70:
82:77:2e:c3:59:29:1a:d1:78:ef:02:3c:7f:9c:96:
78:b6:bd:87:64:1f:97:d1:9d:bb:b3:91:8b:08:87:
63:9f:35:74:47:a5:41:e7:0b:c0:73:33:2f:71:bb:
20:0a:14:4c:87:a6:68:b2:19:28:8a:53:98:0e:45:
3c:22:0d:b8:65:cb:60:0a:c9:c6:56:3d:05:24:7d:
a6:9b:37:63:04:5a:c3:13
coefficient:
00:cc:d7:5c:e6:0e:7b:79:d4:cb:4f:6d:82:a7:45:
90:67:90:dc:d3:83:62:f1:4b:17:43:5c:4a:ea:bf:
38:25:c3:6f:34:e2:05:91:5e:60:d6:de:6d:07:1a:
73:71:b3:1d:73:f2:3c:60:ed:ec:42:d4:39:f8:a4:
ae:d5:aa:40:1e:90:b1:eb:b1:05:a3:2f:03:5f:c6:
b7:07:4c:df:0f:c4:a9:80:8c:31:f5:e2:01:00:73:
8a:25:03:84:4e:48:7a:31:8e:e6:b8:04:4c:44:61:
7d:e4:87:1c:57:4f:45:44:33:bb:f3:ae:1c:d2:e1:
99:ed:78:29:76:4d:8c:6d:91
Related, you never ask how to encrypt or decrypt with a RSA key, yet you claim the answer to the encryption and decryption problems is shown in the code in your answer.
You seem to have made the question a moving target :) You should probably avoid that on Stack Overflow (I think its OK to do in those user thread forums). On Stack Overflow, you should ask a separate question.
You can extract the RSA public key from RSA keypair using d2i_RSAPublicKey and i2d_RSAPublicKey (link). Use i2d_RSAPublicKey to encode your keypair to PKCS#1 RSAPublicKey stucture, store it in a bytestring, then use d2i_RSAPublicKey to decode it back to RSA key struct.
I've found a solution to my question among other Stack-Overflow posts and namely Reading Public/Private Key from Memory with OpenSSL
The answer i was looking for is answered by #SquareRootOfTwentyThree is his last line of code,
After extracting the Public key into a BIO variable called pub:
PEM_write_bio_RSAPublicKey(pub, keypair);
i can send the variable pub across the network, and after it reaches the other side create a RSA variable and put pub inside it:
SOLUTION:
RSA *keypair2 = NULL;
PEM_read_bio_RSAPublicKey( pub, &keypair2, NULL, NULL);
After i've done this i can successfully encrypt the message as usual, using keypair2:
ENCRYPTION:
encrypt = (char*)malloc(RSA_size(keypair));
int encrypt_len;
err = (char*)malloc(130);
if((encrypt_len = RSA_public_encrypt(strlen(msg)+1, (unsigned char*)msg,
(unsigned char*)encrypt, keypair2 ,RSA_PKCS1_OAEP_PADDING)) == -1) {
ERR_load_crypto_strings();
ERR_error_string(ERR_get_error(), err);
fprintf(stderr, "Error encrypting message: %s\n", err);
}
I can then send this encrypt variable back to the first machine, and decrypt it as usual, using my original keypair, without having to send it over the network.
DECRYPTION:
decrypt = (char*)malloc(encrypt_len);
if(RSA_private_decrypt(encrypt_len, (unsigned char*)encrypt, (unsigned char*)decrypt,
keypair, RSA_PKCS1_OAEP_PADDING) == -1) {
ERR_load_crypto_strings();
ERR_error_string(ERR_get_error(), err);
fprintf(stderr, "Error decrypting message: %s\n", err);
}
Thank you everyone for contributing to this post!!!
Reviewing your code, it appears that you successfully separated the public and private keys into the strings pub_key and pri_key, but then used printf to output them which pasted them back together. To just print the public key change the printf statement to:
printf("\n%s\n", pub_key);