diff options
Diffstat (limited to 'lib/crypto/aes.c')
-rw-r--r-- | lib/crypto/aes.c | 22 |
1 files changed, 22 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); + } +} |