diff options
Diffstat (limited to 'libtomcrypt/demos/encrypt.c')
| -rw-r--r-- | libtomcrypt/demos/encrypt.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/libtomcrypt/demos/encrypt.c b/libtomcrypt/demos/encrypt.c new file mode 100644 index 0000000..f38440d --- /dev/null +++ b/libtomcrypt/demos/encrypt.c @@ -0,0 +1,241 @@ +/* encrypt V1.1 Fri Oct 18 04:28:03 NZDT 2002 */ +/* File de/encryption, using libtomcrypt */ +/* Written by Daniel Richards <kyhwana@world-net.co.nz> */ +/* Help from Tom St Denis with various bits */ +/* This code is public domain, no rights reserved. */ +/* Encrypts by default, -d flag enables decryption */ +/* ie: ./encrypt blowfish story.txt story.ct */ +/* ./encrypt -d blowfish story.ct story.pt */ + +#include <tomcrypt.h> + +int errno; + +int usage(char *name) +{ + int x; + + printf("Usage: %s [-d](ecrypt) cipher infile outfile\nCiphers:\n", name); + for (x = 0; cipher_descriptor[x].name != NULL; x++) { + printf("%s\n",cipher_descriptor[x].name); + } + exit(1); +} + +void register_algs(void) +{ + int x; + +#ifdef RIJNDAEL + register_cipher (&aes_desc); +#endif +#ifdef BLOWFISH + register_cipher (&blowfish_desc); +#endif +#ifdef XTEA + register_cipher (&xtea_desc); +#endif +#ifdef RC5 + register_cipher (&rc5_desc); +#endif +#ifdef RC6 + register_cipher (&rc6_desc); +#endif +#ifdef SAFERP + register_cipher (&saferp_desc); +#endif +#ifdef TWOFISH + register_cipher (&twofish_desc); +#endif +#ifdef SAFER + register_cipher (&safer_k64_desc); + register_cipher (&safer_sk64_desc); + register_cipher (&safer_k128_desc); + register_cipher (&safer_sk128_desc); +#endif +#ifdef RC2 + register_cipher (&rc2_desc); +#endif +#ifdef DES + register_cipher (&des_desc); + register_cipher (&des3_desc); +#endif +#ifdef CAST5 + register_cipher (&cast5_desc); +#endif +#ifdef NOEKEON + register_cipher (&noekeon_desc); +#endif +#ifdef SKIPJACK + register_cipher (&skipjack_desc); +#endif +#ifdef KHAZAD + register_cipher (&khazad_desc); +#endif +#ifdef ANUBIS + register_cipher (&anubis_desc); +#endif + + if (register_hash(&sha256_desc) == -1) { + printf("Error registering SHA256\n"); + exit(-1); + } + + if (register_prng(&yarrow_desc) == -1) { + printf("Error registering yarrow PRNG\n"); + exit(-1); + } + + if (register_prng(&sprng_desc) == -1) { + printf("Error registering sprng PRNG\n"); + exit(-1); + } +} + +int main(int argc, char *argv[]) +{ + unsigned char plaintext[512],ciphertext[512]; + unsigned char tmpkey[512], key[MAXBLOCKSIZE], IV[MAXBLOCKSIZE]; + unsigned char inbuf[512]; /* i/o block size */ + unsigned long outlen, y, ivsize, x, decrypt; + symmetric_CTR ctr; + int cipher_idx, hash_idx, ks; + char *infile, *outfile, *cipher; + prng_state prng; + FILE *fdin, *fdout; + + /* register algs, so they can be printed */ + register_algs(); + + if (argc < 4) { + return usage(argv[0]); + } + + if (!strcmp(argv[1], "-d")) { + decrypt = 1; + cipher = argv[2]; + infile = argv[3]; + outfile = argv[4]; + } else { + decrypt = 0; + cipher = argv[1]; + infile = argv[2]; + outfile = argv[3]; + } + + /* file handles setup */ + fdin = fopen(infile,"rb"); + if (fdin == NULL) { + perror("Can't open input for reading"); + exit(-1); + } + + fdout = fopen(outfile,"wb"); + if (fdout == NULL) { + perror("Can't open output for writing"); + exit(-1); + } + + cipher_idx = find_cipher(cipher); + if (cipher_idx == -1) { + printf("Invalid cipher entered on command line.\n"); + exit(-1); + } + + hash_idx = find_hash("sha256"); + if (hash_idx == -1) { + printf("SHA256 not found...?\n"); + exit(-1); + } + + ivsize = cipher_descriptor[cipher_idx].block_length; + ks = hash_descriptor[hash_idx].hashsize; + if (cipher_descriptor[cipher_idx].keysize(&ks) != CRYPT_OK) { + printf("Invalid keysize???\n"); + exit(-1); + } + + printf("\nEnter key: "); + fgets((char *)tmpkey,sizeof(tmpkey), stdin); + outlen = sizeof(key); + if ((errno = hash_memory(hash_idx,tmpkey,strlen((char *)tmpkey),key,&outlen)) != CRYPT_OK) { + printf("Error hashing key: %s\n", error_to_string(errno)); + exit(-1); + } + + if (decrypt) { + /* Need to read in IV */ + if (fread(IV,1,ivsize,fdin) != ivsize) { + printf("Error reading IV from input.\n"); + exit(-1); + } + + if ((errno = ctr_start(cipher_idx,IV,key,ks,0,CTR_COUNTER_LITTLE_ENDIAN,&ctr)) != CRYPT_OK) { + printf("ctr_start error: %s\n",error_to_string(errno)); + exit(-1); + } + + /* IV done */ + do { + y = fread(inbuf,1,sizeof(inbuf),fdin); + + if ((errno = ctr_decrypt(inbuf,plaintext,y,&ctr)) != CRYPT_OK) { + printf("ctr_decrypt error: %s\n", error_to_string(errno)); + exit(-1); + } + + if (fwrite(plaintext,1,y,fdout) != y) { + printf("Error writing to file.\n"); + exit(-1); + } + } while (y == sizeof(inbuf)); + fclose(fdin); + fclose(fdout); + + } else { /* encrypt */ + /* Setup yarrow for random bytes for IV */ + + if ((errno = rng_make_prng(128, find_prng("yarrow"), &prng, NULL)) != CRYPT_OK) { + printf("Error setting up PRNG, %s\n", error_to_string(errno)); + } + + /* You can use rng_get_bytes on platforms that support it */ + /* x = rng_get_bytes(IV,ivsize,NULL);*/ + x = yarrow_read(IV,ivsize,&prng); + if (x != ivsize) { + printf("Error reading PRNG for IV required.\n"); + exit(-1); + } + + if (fwrite(IV,1,ivsize,fdout) != ivsize) { + printf("Error writing IV to output.\n"); + exit(-1); + } + + if ((errno = ctr_start(cipher_idx,IV,key,ks,0,CTR_COUNTER_LITTLE_ENDIAN,&ctr)) != CRYPT_OK) { + printf("ctr_start error: %s\n",error_to_string(errno)); + exit(-1); + } + + do { + y = fread(inbuf,1,sizeof(inbuf),fdin); + + if ((errno = ctr_encrypt(inbuf,ciphertext,y,&ctr)) != CRYPT_OK) { + printf("ctr_encrypt error: %s\n", error_to_string(errno)); + exit(-1); + } + + if (fwrite(ciphertext,1,y,fdout) != y) { + printf("Error writing to output.\n"); + exit(-1); + } + } while (y == sizeof(inbuf)); + fclose(fdout); + fclose(fdin); + } + return 0; +} + +/* $Source: /cvs/libtom/libtomcrypt/demos/encrypt.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/08/04 20:43:50 $ */ |