Hi,
the following code executes once, and does fine. Calling the function a second time gives a segfault during the call marked by "-->" unsigned char *encrypt_message(unsigned char *message, int inl, int *outl) { EVP_CIPHER_CTX ctx; EVP_CIPHER_CTX_init(&ctx); -->EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, NULL); EVP_CIPHER_CTX_set_key_length(&ctx, SHA_DIGEST_LENGTH); EVP_EncryptInit(&ctx, NULL, k, NULL); char *ret; int tmp, ol; ol = 0; ret = (char *)malloc(inl + EVP_CIPHER_CTX_block_size(&ctx)); EVP_EncryptUpdate(&ctx, &ret[ol], &tmp, message, inl); ol = tmp; EVP_EncryptFinal(&ctx, &ret[ol], &tmp); *outl = ol+tmp; return ret; } Anything obvious that might lead to the segfault? Thanks, Felix ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
Try calling EVP_CIPHER_CTX_cleanup(&ctx) at the end...
--- Felix Dorner <[hidden email]> wrote: > Hi, > > the following code executes once, and does fine. > Calling the function a > second time gives a segfault during the call marked > by "-->" > > unsigned char *encrypt_message(unsigned char > *message, int inl, int *outl) > { > EVP_CIPHER_CTX ctx; > EVP_CIPHER_CTX_init(&ctx); > -->EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, > NULL); > EVP_CIPHER_CTX_set_key_length(&ctx, > SHA_DIGEST_LENGTH); > EVP_EncryptInit(&ctx, NULL, k, NULL); > char *ret; > int tmp, ol; > ol = 0; > ret = (char *)malloc(inl + > EVP_CIPHER_CTX_block_size(&ctx)); > EVP_EncryptUpdate(&ctx, &ret[ol], &tmp, > message, inl); > ol = tmp; > EVP_EncryptFinal(&ctx, &ret[ol], &tmp); > *outl = ol+tmp; > return ret; > } > > > Anything obvious that might lead to the segfault? > > Thanks, > Felix > > OpenSSL Project > http://www.openssl.org > User Support Mailing List > [hidden email] > Automated List Manager > [hidden email] > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
In reply to this post by Felix Dorner
Try calling EVP_CIPHER_CTX_cleanup(&ctx) at the end...
--- Felix Dorner <[hidden email]> wrote: > Hi, > > the following code executes once, and does fine. > Calling the function a > second time gives a segfault during the call marked > by "-->" > > unsigned char *encrypt_message(unsigned char > *message, int inl, int *outl) > { > EVP_CIPHER_CTX ctx; > EVP_CIPHER_CTX_init(&ctx); > -->EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, > NULL); > EVP_CIPHER_CTX_set_key_length(&ctx, > SHA_DIGEST_LENGTH); > EVP_EncryptInit(&ctx, NULL, k, NULL); > char *ret; > int tmp, ol; > ol = 0; > ret = (char *)malloc(inl + > EVP_CIPHER_CTX_block_size(&ctx)); > EVP_EncryptUpdate(&ctx, &ret[ol], &tmp, > message, inl); > ol = tmp; > EVP_EncryptFinal(&ctx, &ret[ol], &tmp); > *outl = ol+tmp; > return ret; > } > > > Anything obvious that might lead to the segfault? > > Thanks, > Felix > > OpenSSL Project > http://www.openssl.org > User Support Mailing List > [hidden email] > Automated List Manager > [hidden email] > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
Girish Venkatachalam wrote:
>Try calling EVP_CIPHER_CTX_cleanup(&ctx) at the end... > > > I have tried this, does not change the situation. gdb output is 200 EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, NULL); (gdb) step Program received signal SIGSEGV, Segmentation fault. 0xb7df82fb in mallopt () from /lib/libc.so.6 I really dont know whats wrong here, Felix ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
Have you tried with the EVP_EncryptInit_ex() family of functions ? I'm
not sure it would help much but it could be worth a try Felix Dorner wrote: >Girish Venkatachalam wrote: > > > >>Try calling EVP_CIPHER_CTX_cleanup(&ctx) at the end... >> >> >> >> >> > >I have tried this, does not change the situation. gdb output is > >200 EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, NULL); >(gdb) step > >Program received signal SIGSEGV, Segmentation fault. >0xb7df82fb in mallopt () from /lib/libc.so.6 > > >I really dont know whats wrong here, > >Felix >______________________________________________________________________ >OpenSSL Project http://www.openssl.org >User Support Mailing List [hidden email] >Automated List Manager [hidden email] > > -- Alain Damiral ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
In reply to this post by Felix Dorner
Hi,
> the following code executes once, and does fine. Calling the > function a > second time gives a segfault during the call marked by "-->" You may have inadvertantly corrupted the heap the first time your code is executed. I suggest you put several assert statements to ensure that memory outside of that you allocated is not overwritten. Regards, Mark ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
In reply to this post by Felix Dorner
I'm not much of an expert with any of this, but you may want to look at
some of the return values of some of the functions to make sure everything is good, such as on EVP_EncryptFinal. Please take a look at some code I did up last summer in C++ (but it is almost all C), located at http://lunir.com/Encryption.cpp. The Function in particular would be int Encryption::encrypt(std::ifstream &istream, std::ofstream &ostream). It deals with streams but converts it all into cstrings, so it should roughtly be the same. Hope this helps. -- Matthew Clarkson On Mon, 30 Jan 2006, Felix Dorner wrote: > Hi, > > the following code executes once, and does fine. Calling the function a > second time gives a segfault during the call marked by "-->" > > unsigned char *encrypt_message(unsigned char *message, int inl, int *outl) > { > EVP_CIPHER_CTX ctx; > EVP_CIPHER_CTX_init(&ctx); > -->EVP_EncryptInit(&ctx, EVP_bf_ecb(), NULL, NULL); > EVP_CIPHER_CTX_set_key_length(&ctx, SHA_DIGEST_LENGTH); > EVP_EncryptInit(&ctx, NULL, k, NULL); > char *ret; > int tmp, ol; > ol = 0; > ret = (char *)malloc(inl + EVP_CIPHER_CTX_block_size(&ctx)); > EVP_EncryptUpdate(&ctx, &ret[ol], &tmp, message, inl); > ol = tmp; > EVP_EncryptFinal(&ctx, &ret[ol], &tmp); > *outl = ol+tmp; > return ret; > } > > > Anything obvious that might lead to the segfault? > > Thanks, > Felix > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List [hidden email] > Automated List Manager [hidden email] > OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
I somehow corrupted the ctx object by overshooting the malloced area as
Mark had pointed out. The problem is solved now, thanks, felix ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [hidden email] Automated List Manager [hidden email] |
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