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-rw-r--r--package/kernel/lantiq/ltq-deu/src/ifxmips_aes.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/package/kernel/lantiq/ltq-deu/src/ifxmips_aes.c b/package/kernel/lantiq/ltq-deu/src/ifxmips_aes.c
index eefdd1a959..c0861a503f 100644
--- a/package/kernel/lantiq/ltq-deu/src/ifxmips_aes.c
+++ b/package/kernel/lantiq/ltq-deu/src/ifxmips_aes.c
@@ -58,9 +58,11 @@
#include <asm/byteorder.h>
#include <crypto/algapi.h>
#include <crypto/b128ops.h>
+#include <crypto/gcm.h>
#include <crypto/gf128mul.h>
#include <crypto/scatterwalk.h>
#include <crypto/xts.h>
+#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
@@ -132,6 +134,7 @@ struct aes_ctx {
u32 (*temp)[AES_BLOCK_WORDS];
u8 block[AES_BLOCK_SIZE];
u8 hash[AES_BLOCK_SIZE];
+ struct gf128mul_4k *gf128;
};
extern int disable_deudma;
@@ -1565,6 +1568,308 @@ static struct shash_alg ifxdeu_cbcmac_aes_alg = {
}
};
+/*! \fn int aes_set_key_aead (struct crypto_aead *aead, const uint8_t *in_key, unsigned int key_len)
+ * \ingroup IFX_AES_FUNCTIONS
+ * \brief sets the AES keys for aead gcm
+ * \param aead linux crypto aead
+ * \param in_key input key
+ * \param key_len key lengths of 16, 24 and 32 bytes supported
+ * \return -EINVAL - bad key length, 0 - SUCCESS
+*/
+int aes_set_key_aead (struct crypto_aead *aead, const u8 *in_key, unsigned int key_len)
+{
+ struct aes_ctx *ctx = crypto_aead_ctx(aead);
+ int err;
+
+ err = aes_set_key(&aead->base, in_key, key_len);
+ if (err) return err;
+
+ memset(ctx->block, 0, sizeof(ctx->block));
+ memset(ctx->lastbuffer, 0, AES_BLOCK_SIZE);
+ ifx_deu_aes_ctr(ctx, ctx->block, ctx->block,
+ ctx->lastbuffer, AES_BLOCK_SIZE, CRYPTO_DIR_ENCRYPT, 0);
+ if (ctx->gf128) gf128mul_free_4k(ctx->gf128);
+ ctx->gf128 = gf128mul_init_4k_lle((be128 *)ctx->block);
+
+ return err;
+}
+
+/*! \fn int gcm_aes_setauthsize (struct crypto_aead *aead, unsigned int authsize)
+ * \ingroup IFX_AES_FUNCTIONS
+ * \brief sets the AES keys for aead gcm
+ * \param aead linux crypto aead
+ * \param in_key input authsize
+ * \return -EINVAL - bad authsize length, 0 - SUCCESS
+*/
+int gcm_aes_setauthsize (struct crypto_aead *aead, unsigned int authsize)
+{
+ return crypto_gcm_check_authsize(authsize);
+}
+
+/*! \fn int gcm_aes_encrypt(struct aead_request *req)
+ * \ingroup IFX_AES_FUNCTIONS
+ * \brief GCM AES encrypt using linux crypto aead
+ * \param req aead request
+ * \return err
+*/
+int gcm_aes_encrypt(struct aead_request *req)
+{
+ struct aes_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+ struct skcipher_walk walk;
+ struct skcipher_request request;
+ int err;
+ unsigned int enc_bytes, nbytes;
+ be128 lengths;
+ u8 iv[AES_BLOCK_SIZE];
+
+ lengths.a = cpu_to_be64(req->assoclen * 8);
+ lengths.b = cpu_to_be64(req->cryptlen * 8);
+
+ memset(ctx->hash, 0, sizeof(ctx->hash));
+ memset(ctx->block, 0, sizeof(ctx->block));
+ memcpy(iv, req->iv, GCM_AES_IV_SIZE);
+ *(__be32 *)((void *)iv + GCM_AES_IV_SIZE) = cpu_to_be32(1);
+ ifx_deu_aes_ctr(ctx, ctx->block, ctx->block,
+ iv, 16, CRYPTO_DIR_ENCRYPT, 0);
+
+ request.cryptlen = req->cryptlen + req->assoclen;
+ request.src = req->src;
+ request.dst = req->dst;
+ request.base = req->base;
+
+ crypto_skcipher_alg(crypto_skcipher_reqtfm(&request))->walksize = AES_BLOCK_SIZE;
+
+ if (req->assoclen && (req->assoclen < AES_BLOCK_SIZE))
+ crypto_skcipher_alg(crypto_skcipher_reqtfm(&request))->walksize = req->assoclen;
+
+ err = skcipher_walk_virt(&walk, &request, false);
+
+ //process assoc data if available
+ if (req->assoclen > 0) {
+ unsigned int assoc_remain, ghashlen;
+
+ assoc_remain = req->assoclen;
+ ghashlen = min(req->assoclen, walk.nbytes);
+ while ((nbytes = enc_bytes = ghashlen) && (ghashlen >= AES_BLOCK_SIZE)) {
+ u8 *temp;
+ if (nbytes > req->assoclen) nbytes = enc_bytes = req->assoclen;
+ enc_bytes -= (nbytes % AES_BLOCK_SIZE);
+ memcpy(walk.dst.virt.addr, walk.src.virt.addr, enc_bytes);
+ assoc_remain -= enc_bytes;
+ temp = walk.dst.virt.addr;
+ while (enc_bytes > 0) {
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)temp);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ enc_bytes -= AES_BLOCK_SIZE;
+ temp += 16;
+ }
+ if (assoc_remain < AES_BLOCK_SIZE) walk.stride = assoc_remain;
+ if (assoc_remain == 0) walk.stride = AES_BLOCK_SIZE;
+ enc_bytes = nbytes - (nbytes % AES_BLOCK_SIZE);
+ err = skcipher_walk_done(&walk, (walk.nbytes - enc_bytes));
+ ghashlen = min(assoc_remain, walk.nbytes);
+ }
+
+ if ((enc_bytes = ghashlen)) {
+ memcpy(ctx->lastbuffer, walk.src.virt.addr, enc_bytes);
+ memset(ctx->lastbuffer + enc_bytes, 0, (AES_BLOCK_SIZE - enc_bytes));
+ memcpy(walk.dst.virt.addr, walk.src.virt.addr, ghashlen);
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->lastbuffer);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ walk.stride = AES_BLOCK_SIZE;
+ err = skcipher_walk_done(&walk, (walk.nbytes - ghashlen));
+ }
+ }
+
+ //crypt and hash
+ while ((nbytes = enc_bytes = walk.nbytes) && (walk.nbytes >= AES_BLOCK_SIZE)) {
+ u8 *temp;
+ enc_bytes -= (nbytes % AES_BLOCK_SIZE);
+ ifx_deu_aes_ctr(ctx, walk.dst.virt.addr, walk.src.virt.addr,
+ iv, enc_bytes, CRYPTO_DIR_ENCRYPT, 0);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ temp = walk.dst.virt.addr;
+ while (enc_bytes) {
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)temp);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ enc_bytes -= AES_BLOCK_SIZE;
+ temp += 16;
+ }
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ /* crypt and hash remaining bytes < AES_BLOCK_SIZE */
+ if ((enc_bytes = walk.nbytes)) {
+ ifx_deu_aes_ctr(ctx, walk.dst.virt.addr, walk.src.virt.addr,
+ iv, walk.nbytes, CRYPTO_DIR_ENCRYPT, 0);
+ memcpy(ctx->lastbuffer, walk.dst.virt.addr, enc_bytes);
+ memset(ctx->lastbuffer + enc_bytes, 0, (AES_BLOCK_SIZE - enc_bytes));
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->lastbuffer);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ //finalize and copy hash
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)&lengths);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->block);
+ scatterwalk_map_and_copy(ctx->hash, req->dst, req->cryptlen + req->assoclen, crypto_aead_authsize(crypto_aead_reqtfm(req)), 1);
+
+ aead_request_complete(req, 0);
+
+ return err;
+}
+
+/*! \fn int gcm_aes_decrypt(struct aead_request *req)
+ * \ingroup IFX_AES_FUNCTIONS
+ * \brief GCM AES decrypt using linux crypto aead
+ * \param req aead request
+ * \return err
+*/
+int gcm_aes_decrypt(struct aead_request *req)
+{
+ struct aes_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+ struct skcipher_walk walk;
+ struct skcipher_request request;
+ int err;
+ unsigned int dec_bytes, nbytes, authsize;
+ be128 lengths;
+ u8 iv[AES_BLOCK_SIZE];
+
+ authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
+
+ lengths.a = cpu_to_be64(req->assoclen * 8);
+ lengths.b = cpu_to_be64((req->cryptlen - authsize) * 8);
+
+ memset(ctx->hash, 0, sizeof(ctx->hash));
+ memset(ctx->block, 0, sizeof(ctx->block));
+ memcpy(iv, req->iv, GCM_AES_IV_SIZE);
+ *(__be32 *)((void *)iv + GCM_AES_IV_SIZE) = cpu_to_be32(1);
+ ifx_deu_aes_ctr(ctx, ctx->block, ctx->block,
+ iv, 16, CRYPTO_DIR_ENCRYPT, 0);
+
+ request.cryptlen = req->cryptlen + req->assoclen - authsize;
+ request.src = req->src;
+ request.dst = req->dst;
+ request.base = req->base;
+ crypto_skcipher_alg(crypto_skcipher_reqtfm(&request))->walksize = AES_BLOCK_SIZE;
+
+ if (req->assoclen && (req->assoclen < AES_BLOCK_SIZE))
+ crypto_skcipher_alg(crypto_skcipher_reqtfm(&request))->walksize = req->assoclen;
+
+ err = skcipher_walk_virt(&walk, &request, false);
+
+ //process assoc data if available
+ if (req->assoclen > 0) {
+ unsigned int assoc_remain, ghashlen;
+
+ assoc_remain = req->assoclen;
+ ghashlen = min(req->assoclen, walk.nbytes);
+ while ((nbytes = dec_bytes = ghashlen) && (ghashlen >= AES_BLOCK_SIZE)) {
+ u8 *temp;
+ if (nbytes > req->assoclen) nbytes = dec_bytes = req->assoclen;
+ dec_bytes -= (nbytes % AES_BLOCK_SIZE);
+ memcpy(walk.dst.virt.addr, walk.src.virt.addr, dec_bytes);
+ assoc_remain -= dec_bytes;
+ temp = walk.dst.virt.addr;
+ while (dec_bytes > 0) {
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)temp);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ dec_bytes -= AES_BLOCK_SIZE;
+ temp += 16;
+ }
+ if (assoc_remain < AES_BLOCK_SIZE) walk.stride = assoc_remain;
+ if (assoc_remain == 0) walk.stride = AES_BLOCK_SIZE;
+ dec_bytes = nbytes - (nbytes % AES_BLOCK_SIZE);
+ err = skcipher_walk_done(&walk, (walk.nbytes - dec_bytes));
+ ghashlen = min(assoc_remain, walk.nbytes);
+ }
+
+ if ((dec_bytes = ghashlen)) {
+ memcpy(ctx->lastbuffer, walk.src.virt.addr, dec_bytes);
+ memset(ctx->lastbuffer + dec_bytes, 0, (AES_BLOCK_SIZE - dec_bytes));
+ memcpy(walk.dst.virt.addr, walk.src.virt.addr, ghashlen);
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->lastbuffer);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ walk.stride = AES_BLOCK_SIZE;
+ err = skcipher_walk_done(&walk, (walk.nbytes - ghashlen));
+ }
+ }
+
+ //crypt and hash
+ while ((nbytes = dec_bytes = walk.nbytes) && (walk.nbytes >= AES_BLOCK_SIZE)) {
+ u8 *temp;
+ dec_bytes -= (nbytes % AES_BLOCK_SIZE);
+ temp = walk.src.virt.addr;
+ while (dec_bytes) {
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)temp);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ dec_bytes -= AES_BLOCK_SIZE;
+ temp += 16;
+ }
+ dec_bytes = nbytes - (nbytes % AES_BLOCK_SIZE);
+ ifx_deu_aes_ctr(ctx, walk.dst.virt.addr, walk.src.virt.addr,
+ iv, dec_bytes, CRYPTO_DIR_DECRYPT, 0);
+ nbytes &= AES_BLOCK_SIZE - 1;
+ err = skcipher_walk_done(&walk, nbytes);
+ }
+
+ /* crypt and hash remaining bytes < AES_BLOCK_SIZE */
+ if ((dec_bytes = walk.nbytes)) {
+ memcpy(ctx->lastbuffer, walk.src.virt.addr, dec_bytes);
+ memset(ctx->lastbuffer + dec_bytes, 0, (AES_BLOCK_SIZE - dec_bytes));
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->lastbuffer);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ ifx_deu_aes_ctr(ctx, walk.dst.virt.addr, walk.src.virt.addr,
+ iv, walk.nbytes, CRYPTO_DIR_DECRYPT, 0);
+ err = skcipher_walk_done(&walk, 0);
+ }
+
+ //finalize and copy hash
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)&lengths);
+ gf128mul_4k_lle((be128 *)ctx->hash, ctx->gf128);
+ u128_xor((u128 *)ctx->hash, (u128 *)ctx->hash, (u128 *)ctx->block);
+
+ scatterwalk_map_and_copy(ctx->lastbuffer, req->src, req->cryptlen + req->assoclen - authsize, authsize, 0);
+ err = crypto_memneq(ctx->lastbuffer, ctx->hash, authsize) ? -EBADMSG : 0;
+
+ aead_request_complete(req, 0);
+
+ return err;
+}
+
+/*! \fn void aes_gcm_exit_tfm(struct crypto_tfm *tfm)
+ * \ingroup IFX_aes_cbcmac_FUNCTIONS
+ * \brief free pointers in aes_ctx
+ * \param tfm linux crypto shash transform
+*/
+static void aes_gcm_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct aes_ctx *ctx = crypto_tfm_ctx(tfm);
+ if (ctx->gf128) gf128mul_free_4k(ctx->gf128);
+}
+
+/*
+ * \brief AES function mappings
+*/
+struct aead_alg ifxdeu_gcm_aes_alg = {
+ .base.cra_name = "gcm(aes)",
+ .base.cra_driver_name = "ifxdeu-gcm(aes)",
+ .base.cra_priority = 400,
+ .base.cra_flags = CRYPTO_ALG_TYPE_SKCIPHER | CRYPTO_ALG_KERN_DRIVER_ONLY,
+ .base.cra_blocksize = 1,
+ .base.cra_ctxsize = sizeof(struct aes_ctx),
+ .base.cra_module = THIS_MODULE,
+ .base.cra_list = LIST_HEAD_INIT(ifxdeu_gcm_aes_alg.base.cra_list),
+ .base.cra_exit = aes_gcm_exit_tfm,
+ .ivsize = GCM_AES_IV_SIZE,
+ .maxauthsize = AES_BLOCK_SIZE,
+ .chunksize = AES_BLOCK_SIZE,
+ .setkey = aes_set_key_aead,
+ .encrypt = gcm_aes_encrypt,
+ .decrypt = gcm_aes_decrypt,
+ .setauthsize = gcm_aes_setauthsize,
+};
/*! \fn int ifxdeu_init_aes (void)
* \ingroup IFX_AES_FUNCTIONS
@@ -1604,12 +1909,19 @@ int ifxdeu_init_aes (void)
if ((ret = crypto_register_shash(&ifxdeu_cbcmac_aes_alg)))
goto cbcmac_aes_err;
+ if ((ret = crypto_register_aead(&ifxdeu_gcm_aes_alg)))
+ goto gcm_aes_err;
+
CRTCL_SECT_INIT;
printk (KERN_NOTICE "IFX DEU AES initialized%s%s.\n", disable_multiblock ? "" : " (multiblock)", disable_deudma ? "" : " (DMA)");
return ret;
+gcm_aes_err:
+ crypto_unregister_aead(&ifxdeu_gcm_aes_alg);
+ printk (KERN_ERR "IFX gcm_aes initialization failed!\n");
+ return ret;
cbcmac_aes_err:
crypto_unregister_shash(&ifxdeu_cbcmac_aes_alg);
printk (KERN_ERR "IFX cbcmac_aes initialization failed!\n");
@@ -1663,4 +1975,5 @@ void ifxdeu_fini_aes (void)
crypto_unregister_skcipher (&ifxdeu_ctr_basic_aes_alg);
crypto_unregister_skcipher (&ifxdeu_ctr_rfc3686_aes_alg);
crypto_unregister_shash (&ifxdeu_cbcmac_aes_alg);
+ crypto_unregister_aead (&ifxdeu_gcm_aes_alg);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 21:46:12 +0000