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Code

lib/crypto: add aes_cfb8_encrypt()

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metze

Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Mon Jan  3 17:32:07 CET 2011 on sn-devel-104
This commit is contained in:
Stefan Metzmacher 2009-09-18 01:04:02 +02:00
parent 2d466b41cd
commit ea5940e7eb
2 changed files with 26 additions and 0 deletions
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22
lib/crypto/aes.c
View File

@ -112,3 +112,25 @@ AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
}
}
}
void aes_cfb8_encrypt(const uint8_t *in, uint8_t *out,
size_t length, const AES_KEY *key,
uint8_t *iv, int forward)
{
size_t i;
for (i=0; i < length; i++) {
uint8_t tiv[AES_BLOCK_SIZE*2];
memcpy(tiv, iv, AES_BLOCK_SIZE);
AES_encrypt(iv, iv, key);
if (!forward) {
tiv[AES_BLOCK_SIZE] = in[i];
}
out[i] = in[i] ^ iv[0];
if (forward) {
tiv[AES_BLOCK_SIZE] = out[i];
}
memcpy(iv, tiv+1, AES_BLOCK_SIZE);
}
}

4
lib/crypto/aes.h
View File

@ -72,6 +72,10 @@ void AES_cbc_encrypt(const unsigned char *, unsigned char *,
const unsigned long, const AES_KEY *,
unsigned char *, int);
void aes_cfb8_encrypt(const uint8_t *in, uint8_t *out,
size_t length, const AES_KEY *key,
uint8_t *iv, int forward);
#ifdef __cplusplus
}
#endif