Hi,
After a bit of web research I came up with the program below to try to
get a bowfish function working.
The examples online all seem to be for file stream input rather than for
simple char buffers.
The program fails when I try to decrypt an encrypted buffer and fails on
the EVP_CipherFinal_ex() call.
Anyone able to help me get this working ?
Regards,
Emyr
#include <string.h>
#include <openssl/evp.h>
#include <openssl/buffer.h>
int do_crypt(unsigned char *inbuf, int inlen, unsigned char *outbuf, int
*outlen, int do_encrypt) {
printf("do encrypt=%d\n",do_encrypt);
printf("inlen=%d\n",inlen);
printf("outlen=%d\n",inlen+EVP_MAX_BLOCK_LENGTH);
outbuf=(unsigned char*) malloc(inlen+EVP_MAX_BLOCK_LENGTH);
int tmplen=0;
unsigned char key[] = "0123456789";
unsigned char iv[] = "12345678";
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx);
EVP_CipherInit_ex(&ctx, EVP_bf_cbc(), NULL, NULL, NULL, do_encrypt);
EVP_CIPHER_CTX_set_key_length(&ctx, 10);
EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, do_encrypt);
if(!EVP_CipherUpdate(&ctx, outbuf, outlen, inbuf, inlen)) {
/* Error */
printf("* update failed *\n");
EVP_CIPHER_CTX_cleanup(&ctx);
return 0;
}
int db=*outlen;
printf("db=%d\n",db);
if(!EVP_CipherFinal_ex(&ctx, outbuf+db, &tmplen)) {
/* Error */
printf("* finalise failed *\n");
EVP_CIPHER_CTX_cleanup(&ctx);
return 0;
}
printf("tmplen=%d\n",tmplen);
(*outlen)=db+tmplen;
EVP_CIPHER_CTX_cleanup(&ctx);
return 1;
}
int main(int argc, char **argv) {
char *plain="the quick brown fox jumps over the lazy dog";
int plain_len=strlen(plain);
printf("plain_len=%d\n",plain_len);
unsigned char *cipher;
int cipher_len;
printf("***** ENCRYPT *****\n");
if (!do_crypt((unsigned char*) plain, strlen(plain), cipher,
&cipher_len, 1)) {
printf("failed to encrypt\n");
return 1;
}
printf("cipher_len=%d\n",cipher_len);
char *decrypt;
int decrypt_len;
printf("***** DECRYPT *****\n");
if(!do_crypt(cipher, cipher_len, decrypt, &decrypt_len, 0)) {
printf("failed to decrypt\n");
return 1;
}
printf("decrypt=\"%s\"\n",decrypt);
printf("decrypt_len=%d\n",decrypt_len);
return 0;
}
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