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crypto: aes-generic - drop key expansion routine in favor of library version
Drop aes-generic's version of crypto_aes_expand_key(), and switch to the key expansion routine provided by the AES library. AES key expansion is not performance critical, and it is better to have a single version shared by all AES implementations. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
c184472902
commit
5bb12d7825
@ -1072,6 +1072,7 @@ config CRYPTO_LIB_AES
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config CRYPTO_AES
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tristate "AES cipher algorithms"
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select CRYPTO_ALGAPI
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select CRYPTO_LIB_AES
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help
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AES cipher algorithms (FIPS-197). AES uses the Rijndael
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algorithm.
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@ -1125,155 +1125,6 @@ EXPORT_SYMBOL_GPL(crypto_fl_tab);
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EXPORT_SYMBOL_GPL(crypto_it_tab);
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EXPORT_SYMBOL_GPL(crypto_il_tab);
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/* initialise the key schedule from the user supplied key */
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#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)
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#define imix_col(y, x) do { \
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u = star_x(x); \
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v = star_x(u); \
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w = star_x(v); \
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t = w ^ (x); \
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(y) = u ^ v ^ w; \
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(y) ^= ror32(u ^ t, 8) ^ \
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ror32(v ^ t, 16) ^ \
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ror32(t, 24); \
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} while (0)
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#define ls_box(x) \
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crypto_fl_tab[0][byte(x, 0)] ^ \
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crypto_fl_tab[1][byte(x, 1)] ^ \
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crypto_fl_tab[2][byte(x, 2)] ^ \
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crypto_fl_tab[3][byte(x, 3)]
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#define loop4(i) do { \
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t = ror32(t, 8); \
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t = ls_box(t) ^ rco_tab[i]; \
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t ^= ctx->key_enc[4 * i]; \
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ctx->key_enc[4 * i + 4] = t; \
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t ^= ctx->key_enc[4 * i + 1]; \
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ctx->key_enc[4 * i + 5] = t; \
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t ^= ctx->key_enc[4 * i + 2]; \
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ctx->key_enc[4 * i + 6] = t; \
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t ^= ctx->key_enc[4 * i + 3]; \
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ctx->key_enc[4 * i + 7] = t; \
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} while (0)
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#define loop6(i) do { \
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t = ror32(t, 8); \
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t = ls_box(t) ^ rco_tab[i]; \
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t ^= ctx->key_enc[6 * i]; \
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ctx->key_enc[6 * i + 6] = t; \
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t ^= ctx->key_enc[6 * i + 1]; \
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ctx->key_enc[6 * i + 7] = t; \
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t ^= ctx->key_enc[6 * i + 2]; \
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ctx->key_enc[6 * i + 8] = t; \
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t ^= ctx->key_enc[6 * i + 3]; \
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ctx->key_enc[6 * i + 9] = t; \
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t ^= ctx->key_enc[6 * i + 4]; \
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ctx->key_enc[6 * i + 10] = t; \
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t ^= ctx->key_enc[6 * i + 5]; \
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ctx->key_enc[6 * i + 11] = t; \
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} while (0)
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#define loop8tophalf(i) do { \
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t = ror32(t, 8); \
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t = ls_box(t) ^ rco_tab[i]; \
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t ^= ctx->key_enc[8 * i]; \
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ctx->key_enc[8 * i + 8] = t; \
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t ^= ctx->key_enc[8 * i + 1]; \
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ctx->key_enc[8 * i + 9] = t; \
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t ^= ctx->key_enc[8 * i + 2]; \
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ctx->key_enc[8 * i + 10] = t; \
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t ^= ctx->key_enc[8 * i + 3]; \
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ctx->key_enc[8 * i + 11] = t; \
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} while (0)
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#define loop8(i) do { \
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loop8tophalf(i); \
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t = ctx->key_enc[8 * i + 4] ^ ls_box(t); \
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ctx->key_enc[8 * i + 12] = t; \
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t ^= ctx->key_enc[8 * i + 5]; \
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ctx->key_enc[8 * i + 13] = t; \
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t ^= ctx->key_enc[8 * i + 6]; \
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ctx->key_enc[8 * i + 14] = t; \
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t ^= ctx->key_enc[8 * i + 7]; \
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ctx->key_enc[8 * i + 15] = t; \
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} while (0)
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/**
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* crypto_aes_expand_key - Expands the AES key as described in FIPS-197
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* @ctx: The location where the computed key will be stored.
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* @in_key: The supplied key.
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* @key_len: The length of the supplied key.
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*
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* Returns 0 on success. The function fails only if an invalid key size (or
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* pointer) is supplied.
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* The expanded key size is 240 bytes (max of 14 rounds with a unique 16 bytes
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* key schedule plus a 16 bytes key which is used before the first round).
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* The decryption key is prepared for the "Equivalent Inverse Cipher" as
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* described in FIPS-197. The first slot (16 bytes) of each key (enc or dec) is
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* for the initial combination, the second slot for the first round and so on.
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*/
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int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
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unsigned int key_len)
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{
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u32 i, t, u, v, w, j;
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if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&
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key_len != AES_KEYSIZE_256)
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return -EINVAL;
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ctx->key_length = key_len;
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ctx->key_enc[0] = get_unaligned_le32(in_key);
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ctx->key_enc[1] = get_unaligned_le32(in_key + 4);
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ctx->key_enc[2] = get_unaligned_le32(in_key + 8);
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ctx->key_enc[3] = get_unaligned_le32(in_key + 12);
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ctx->key_dec[key_len + 24] = ctx->key_enc[0];
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ctx->key_dec[key_len + 25] = ctx->key_enc[1];
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ctx->key_dec[key_len + 26] = ctx->key_enc[2];
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ctx->key_dec[key_len + 27] = ctx->key_enc[3];
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switch (key_len) {
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case AES_KEYSIZE_128:
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t = ctx->key_enc[3];
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for (i = 0; i < 10; ++i)
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loop4(i);
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break;
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case AES_KEYSIZE_192:
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ctx->key_enc[4] = get_unaligned_le32(in_key + 16);
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t = ctx->key_enc[5] = get_unaligned_le32(in_key + 20);
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for (i = 0; i < 8; ++i)
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loop6(i);
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break;
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case AES_KEYSIZE_256:
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ctx->key_enc[4] = get_unaligned_le32(in_key + 16);
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ctx->key_enc[5] = get_unaligned_le32(in_key + 20);
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ctx->key_enc[6] = get_unaligned_le32(in_key + 24);
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t = ctx->key_enc[7] = get_unaligned_le32(in_key + 28);
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for (i = 0; i < 6; ++i)
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loop8(i);
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loop8tophalf(i);
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break;
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}
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ctx->key_dec[0] = ctx->key_enc[key_len + 24];
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ctx->key_dec[1] = ctx->key_enc[key_len + 25];
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ctx->key_dec[2] = ctx->key_enc[key_len + 26];
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ctx->key_dec[3] = ctx->key_enc[key_len + 27];
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for (i = 4; i < key_len + 24; ++i) {
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j = key_len + 24 - (i & ~3) + (i & 3);
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imix_col(ctx->key_dec[j], ctx->key_enc[i]);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_aes_expand_key);
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/**
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* crypto_aes_set_key - Set the AES key.
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* @tfm: The %crypto_tfm that is used in the context.
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@ -1281,7 +1132,7 @@ EXPORT_SYMBOL_GPL(crypto_aes_expand_key);
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* @key_len: The size of the key.
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*
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* Returns 0 on success, on failure the %CRYPTO_TFM_RES_BAD_KEY_LEN flag in tfm
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* is set. The function uses crypto_aes_expand_key() to expand the key.
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* is set. The function uses aes_expand_key() to expand the key.
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* &crypto_aes_ctx _must_ be the private data embedded in @tfm which is
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* retrieved with crypto_tfm_ctx().
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*/
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@ -1292,7 +1143,7 @@ int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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u32 *flags = &tfm->crt_flags;
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int ret;
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ret = crypto_aes_expand_key(ctx, in_key, key_len);
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ret = aes_expandkey(ctx, in_key, key_len);
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if (!ret)
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return 0;
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@ -35,8 +35,6 @@ extern const u32 crypto_il_tab[4][256] ____cacheline_aligned;
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int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len);
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int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
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unsigned int key_len);
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/**
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* aes_expandkey - Expands the AES key as described in FIPS-197
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