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crypto: Implement aes_wrap

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Add the inverse of aes_unwrap for eapol server usage.
This commit is contained in:
Andrew Zaborowski 2017-08-31 04:04:47 +02:00 committed by Denis Kenzior
parent f66ae1e481
commit 4f865ba9f8
2 changed files with 43 additions and 0 deletions
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42
src/crypto.c
View File

@ -162,6 +162,48 @@ bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
return true;
}
/*
* AES Key-wrap from RFC 3394 for 128-bit key
*
* The key is specified using @kek. @in contains the plaintext data and @len
* contains its length. @out will contain the encrypted data. The result
* will be (len + 8) bytes.
*
* Returns: true on success, false if an IV mismatch has occurred.
*
* NOTE: Buffers @in and @out can overlap
*/
bool aes_wrap(const uint8_t *kek, const uint8_t *in, size_t len, uint8_t *out)
{
uint64_t b[2] = { 0xa6a6a6a6a6a6a6a6, 0 };
uint64_t *r = (uint64_t *) out + 1;
size_t n = len >> 3;
unsigned int i, j;
uint32_t t = 1;
struct l_cipher *cipher;
cipher = l_cipher_new(L_CIPHER_AES, kek, 16);
if (!cipher)
return false;
memmove(r, in, len);
for (j = 0; j < 6; j++) {
for (i = 0; i < n; i++, t++) {
b[1] = L_GET_UNALIGNED(r + i);
l_cipher_encrypt(cipher, b, b, 16);
L_PUT_UNALIGNED(b[1], r + i);
b[0] ^= L_CPU_TO_BE64(t);
}
}
L_PUT_UNALIGNED(b[0], r - 1);
l_cipher_free(cipher);
return true;
}
bool arc4_skip(const uint8_t *key, size_t key_len, size_t skip,
const uint8_t *in, size_t len, uint8_t *out)
{

1
src/crypto.h
View File

@ -65,6 +65,7 @@ bool cmac_aes(const void *key, size_t key_len,
bool aes_unwrap(const uint8_t *kek, const uint8_t *in, size_t len,
uint8_t *out);
bool aes_wrap(const uint8_t *kek, const uint8_t *in, size_t len, uint8_t *out);
bool arc4_skip(const uint8_t *key, size_t key_len, size_t skip,
const uint8_t *in, size_t len, uint8_t *out);