Hi, Your file pk.der contains a public key encoded as a SubjectPublicKeyInfo and NOT as a PKCS#1 encoding. So, you should use the function d2i_RSA_PUBKEY instead of d2i_RSAPublicKey in order to read the public key.
Cheers, -- Mounir IDRASSI IDRIX http://www.idrix.fr > Dear all, > > I am working on a project which has to encrypt datas thanks to an RSA > public key stored in DER format. > > I tried to write a test program using the d2i_RSAPublicKey, but the > function returns NULL. However I'm pretty sure the file is correct, > since I could use openssl command-line to obtain a public key in PEM > format. > > The code looks like this: > > [...] > > int main() > { > RSA *rsa = NULL; > int fd; > unsigned char buf[160]; > const unsigned char *p = buf; > fd = open("pk.der", O_RDONLY); > if (fd<0) > { > exit(1); > } > if (read(fd, buf, sizeof(buf)) != sizeof(buf)) > { > close(fd); > exit(2); > } > close(fd); > rsa = d2i_RSAPublicKey(NULL, &p, sizeof(buf)); > if (rsa==NULL) > { > ERR_print_errors_fp(stderr); > return 1; > } > return 0; > } > > Running the program gives back the following message: > 23354:error:0D0680A8:lib(13):func(104):reason(168):tasn_dec.c:1306: > 23354:error:0D06C03A:lib(13):func(108):reason(58):tasn_dec.c:830: > 23354:error:0D08303A:lib(13):func(131):reason(58):tasn_dec.c:749:Field=n, > Type=RSA > > Also, I noticed that if I replace > const unsigned char *p = buf; > by > const unsigned char *p = buf + 22; > Then the call to d2i_RSAPublicKey returns a non-NULL value. > > I assume I am doing something the wrong way but can not figure out what. > Could someone please help ? > > The complete code for the program I used is at > http://inova.snv.jussieu.fr/ssltest.c > and the DER file that produced the previously shown error messages is at > http://inova.snv.jussieu.fr/pk.der > > In advance, many thanks for any help. > Sébastien. > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
