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Merge pull request #43 from pghmcfc/develop

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Add support for two-key Triple-DES
This commit is contained in:
Steffen Jaeckel 2014-04-28 21:05:26 +02:00
commit f4d7baaacc
1 changed files with 13 additions and 3 deletions
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16
src/ciphers/des.c
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@ -1562,17 +1562,27 @@ int des3_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_k
return CRYPT_INVALID_ROUNDS;
}
if (keylen != 24) {
if (keylen != 24 && keylen != 16) {
return CRYPT_INVALID_KEYSIZE;
}
deskey(key, EN0, skey->des3.ek[0]);
deskey(key+8, DE1, skey->des3.ek[1]);
deskey(key+16, EN0, skey->des3.ek[2]);
if (keylen == 24) {
deskey(key+16, EN0, skey->des3.ek[2]);
} else {
/* two-key 3DES: K3=K1 */
deskey(key, EN0, skey->des3.ek[2]);
}
deskey(key, DE1, skey->des3.dk[2]);
deskey(key+8, EN0, skey->des3.dk[1]);
deskey(key+16, DE1, skey->des3.dk[0]);
if (keylen == 24) {
deskey(key+16, DE1, skey->des3.dk[0]);
} else {
/* two-key 3DES: K3=K1 */
deskey(key, DE1, skey->des3.dk[0]);
}
return CRYPT_OK;
}