diff options
Diffstat (limited to 'src/crypto/aes-wrap.c')
| -rw-r--r-- | src/crypto/aes-wrap.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/src/crypto/aes-wrap.c b/src/crypto/aes-wrap.c index 89d6f94b..7ed34e80 100644 --- a/src/crypto/aes-wrap.c +++ b/src/crypto/aes-wrap.c @@ -1,5 +1,5 @@ /* - * AES Key Wrap Algorithm (128-bit KEK) (RFC3394) + * AES Key Wrap Algorithm (RFC3394) * * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi> * @@ -14,19 +14,21 @@ #include "aes_wrap.h" /** - * aes_wrap - Wrap keys with AES Key Wrap Algorithm (128-bit KEK) (RFC3394) - * @kek: 16-octet Key encryption key (KEK) + * aes_wrap - Wrap keys with AES Key Wrap Algorithm (RFC3394) + * @kek: Key encryption key (KEK) + * @kek_len: Length of KEK in octets * @n: Length of the plaintext key in 64-bit units; e.g., 2 = 128-bit = 16 * bytes * @plain: Plaintext key to be wrapped, n * 64 bits * @cipher: Wrapped key, (n + 1) * 64 bits * Returns: 0 on success, -1 on failure */ -int aes_wrap(const u8 *kek, int n, const u8 *plain, u8 *cipher) +int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher) { - u8 *a, *r, b[16]; + u8 *a, *r, b[AES_BLOCK_SIZE]; int i, j; void *ctx; + unsigned int t; a = cipher; r = cipher + 8; @@ -35,7 +37,7 @@ int aes_wrap(const u8 *kek, int n, const u8 *plain, u8 *cipher) os_memset(a, 0xa6, 8); os_memcpy(r, plain, 8 * n); - ctx = aes_encrypt_init(kek, 16); + ctx = aes_encrypt_init(kek, kek_len); if (ctx == NULL) return -1; @@ -53,7 +55,11 @@ int aes_wrap(const u8 *kek, int n, const u8 *plain, u8 *cipher) os_memcpy(b + 8, r, 8); aes_encrypt(ctx, b, b); os_memcpy(a, b, 8); - a[7] ^= n * j + i; + t = n * j + i; + a[7] ^= t; + a[6] ^= t >> 8; + a[5] ^= t >> 16; + a[4] ^= t >> 24; os_memcpy(r, b + 8, 8); r += 8; } |