Segmentation fault after RSA_check_key

[T. Quirin]

Hi, thank you Steve my verification function works now. But I want to check the RSA key before I use it. If I run "if(RSA_check_key(r) != 1) return -5;" I get a "Segmentation fault ". It works without this line. #include <string> #include <openssl/bio.h> #include <openssl/pem.h> #include <openssl/bn.h> #include <openssl/sha.h> #include <openssl/rsa.h> #include <openssl/x509.h> #include <openssl/objects.h> #include <openssl/evp.h> #include <iostream> #include "../base64/base64.h" #include "verify.h" using namespace std; int verify::verifyHash(const string & hash, const string & sign,                         string & cert ){     if(hash.length() != 20) return -1;     if(sign.length() != 128) return -2;     char sha1[21];     char signature[129];     RSA *r;     X509 *x509Cert;     hash.copy(sha1, 20);     sign.copy(signature, 128);     char* buffer = new(char[cert.length() + 1]);     cert.copy(buffer,cert.length());     unsigned char *cp = (unsigned char *) buffer;     x509Cert = d2i_X509(0, &cp , cert.length());     if (x509Cert == NULL) return -3;     EVP_PKEY* evpKey = X509_get_pubkey(x509Cert);     if (evpKey == 0) return -4;     r = EVP_PKEY_get1_RSA(evpKey);     if (r == 0) return -4;     BN_CTX *c;     int ret;     if(RSA_check_key(r) != 1) return -5;     if(!(c = BN_CTX_new())) return -6;     if(!RSA_blinding_on(r, c)){         BN_CTX_free(c);         return -7;     };     ret = RSA_verify(NID_sha1, (unsigned char *) sha1, 20,                             (unsigned char *) signature, 128, r);     RSA_blinding_off(r);     BN_CTX_free(c);     RSA_free(r);     if (ret < 0) return -8;     if(ret == 1) return 1;     return 0; }; Thanks Thomas