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| author | Stefan Metzmacher <metze@samba.org> | 2009-09-18 01:04:02 +0200 |
|---|---|---|
| committer | Stefan Metzmacher <metze@samba.org> | 2011-01-03 17:32:07 +0100 |
| commit | ea5940e7eb099feb693f53bb725fc55f3d5d5ef0 (patch) | |
| tree | c20cbe3be64be89a88965b22aab8936c69c54177 | |
| parent | 2d466b41cd20d0162d3fa4cd29a83bbc20d00454 (diff) | |
| download | samba-ea5940e7eb099feb693f53bb725fc55f3d5d5ef0.tar.gz samba-ea5940e7eb099feb693f53bb725fc55f3d5d5ef0.tar.bz2 samba-ea5940e7eb099feb693f53bb725fc55f3d5d5ef0.zip | |
lib/crypto: add aes_cfb8_encrypt()
metze
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Mon Jan 3 17:32:07 CET 2011 on sn-devel-104
| -rw-r--r-- | lib/crypto/aes.c | 22 | ||||
| -rw-r--r-- | lib/crypto/aes.h | 4 |
2 files changed, 26 insertions, 0 deletions
diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c index 7735e8ff37..a47a456593 100644 --- a/lib/crypto/aes.c +++ b/lib/crypto/aes.c @@ -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); + } +} diff --git a/lib/crypto/aes.h b/lib/crypto/aes.h index e74d345215..a2b6c077e6 100644 --- a/lib/crypto/aes.h +++ b/lib/crypto/aes.h @@ -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 |