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add AES_cbc_encrypt

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@13787 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2004-04-25 19:05:05 +00:00
parent 5eca4bbf39
commit 234befda59
2 changed files with 53 additions and 0 deletions
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49
lib/des/aes.c
View File

@@ -43,6 +43,8 @@ RCSID("$Id$");
#include <ktypes.h>
#endif
#include <string.h>
#include "rijndael-alg-fst.h"
#include "aes.h"
@@ -75,3 +77,50 @@ AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
{
rijndaelDecrypt(key->key, key->rounds, in, out);
}
void
AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
unsigned long size, const AES_KEY *key,
unsigned char *iv, int encrypt)
{
char tmp[AES_BLOCK_SIZE];
int i;
if (encrypt) {
while (size >= AES_BLOCK_SIZE) {
for (i = 0; i < AES_BLOCK_SIZE; i++)
tmp[i] = in[i] ^ iv[i];
AES_encrypt(tmp, out, key);
memcpy(iv, out, AES_BLOCK_SIZE);
size -= AES_BLOCK_SIZE;
in += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
}
if (size) {
for (i = 0; i < size; i++)
tmp[i] = in[i] ^ iv[i];
for (i = size; i < AES_BLOCK_SIZE; i++)
tmp[i] = iv[i];
AES_encrypt(tmp, out, key);
memcpy(iv, out, AES_BLOCK_SIZE);
}
} else {
while (size >= AES_BLOCK_SIZE) {
memcpy(tmp, in, AES_BLOCK_SIZE);
AES_decrypt(tmp, out, key);
for (i = 0; i < AES_BLOCK_SIZE; i++)
out[i] ^= iv[i];
memcpy(iv, tmp, AES_BLOCK_SIZE);
size -= AES_BLOCK_SIZE;
in += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
}
if (size) {
memcpy(tmp, in, AES_BLOCK_SIZE);
AES_decrypt(tmp, out, key);
for (i = 0; i < size; i++)
out[i] ^= iv[i];
memcpy(iv, tmp, AES_BLOCK_SIZE);
}
}
}

4
lib/des/aes.h
View File

@@ -52,3 +52,7 @@ int AES_set_decrypt_key(const unsigned char *, const int, AES_KEY *);
void AES_encrypt(const unsigned char *, unsigned char *, const AES_KEY *);
void AES_decrypt(const unsigned char *, unsigned char *, const AES_KEY *);
void AES_cbc_encrypt(const unsigned char *, unsigned char *,
const unsigned long, const AES_KEY *,
unsigned char *, int);