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54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#include <stdio.h>
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#include <openssl/rsa.h>
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/* This is a simple program to generate an RSA private key. It then
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* saves both the public and private key into a char array, then
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* re-reads them. It saves them as DER encoded binary data.
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*/
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void callback(stage,count,arg)
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int stage,count;
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char *arg;
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{
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FILE *out;
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out=(FILE *)arg;
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fprintf(out,"%d",stage);
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if (stage == 3)
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fprintf(out,"\n");
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fflush(out);
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}
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main()
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{
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RSA *rsa,*pub_rsa,*priv_rsa;
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int len;
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unsigned char buf[1024],*p;
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rsa=RSA_generate_key(512,RSA_F4,callback,(char *)stdout);
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p=buf;
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/* Save the public key into buffer, we know it will be big enough
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* but we should really check how much space we need by calling the
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* i2d functions with a NULL second parameter */
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len=i2d_RSAPublicKey(rsa,&p);
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len+=i2d_RSAPrivateKey(rsa,&p);
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printf("The public and private key are now both in a char array\n");
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printf("and are taking up %d bytes\n",len);
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RSA_free(rsa);
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p=buf;
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pub_rsa=d2i_RSAPublicKey(NULL,&p,(long)len);
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len-=(p-buf);
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priv_rsa=d2i_RSAPrivateKey(NULL,&p,(long)len);
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if ((pub_rsa == NULL) || (priv_rsa == NULL))
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ERR_print_errors_fp(stderr);
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RSA_free(pub_rsa);
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RSA_free(priv_rsa);
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}
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