This patch adds support for rfc4543(gcm(aes)) - i.e. AES-GMAC - for use
with IPsec ESP
Signed-off-by: Pascal van Leeuwen <pvanleeuwen@xxxxxxxxxxxxxx>
---
drivers/crypto/inside-secure/safexcel.c | 1 +
drivers/crypto/inside-secure/safexcel.h | 2 +
drivers/crypto/inside-secure/safexcel_cipher.c | 86 +++++++++++++++++++++-----
3 files changed, 74 insertions(+), 15 deletions(-)
diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c
index 1914124..09d17f3 100644
--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -1205,6 +1205,7 @@ static int safexcel_request_ring_irq(void *pdev, int irqid,
&safexcel_alg_authenc_hmac_sha512_cbc_des,
&safexcel_alg_authenc_hmac_sha384_cbc_des,
&safexcel_alg_rfc4106_gcm,
+ &safexcel_alg_rfc4543_gcm,
};
static int safexcel_register_algorithms(struct safexcel_crypto_priv *priv)
diff --git a/drivers/crypto/inside-secure/safexcel.h b/drivers/crypto/inside-secure/safexcel.h
index 6c91d49..c172b97 100644
--- a/drivers/crypto/inside-secure/safexcel.h
+++ b/drivers/crypto/inside-secure/safexcel.h
@@ -407,6 +407,7 @@ struct safexcel_context_record {
#define EIP197_XCM_MODE_CCM 2
#define EIP197_AEAD_TYPE_IPSEC_ESP 2
+#define EIP197_AEAD_TYPE_IPSEC_ESP_GMAC 3
#define EIP197_AEAD_IPSEC_IV_SIZE 8
#define EIP197_AEAD_IPSEC_NONCE_SIZE 4
@@ -911,5 +912,6 @@ int safexcel_hmac_setkey(const char *alg, const u8 *key, unsigned int keylen,
extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha512_cbc_des;
extern struct safexcel_alg_template safexcel_alg_authenc_hmac_sha384_cbc_des;
extern struct safexcel_alg_template safexcel_alg_rfc4106_gcm;
+extern struct safexcel_alg_template safexcel_alg_rfc4543_gcm;
#endif
diff --git a/drivers/crypto/inside-secure/safexcel_cipher.c b/drivers/crypto/inside-secure/safexcel_cipher.c
index d0334b2..e895c5a 100644
--- a/drivers/crypto/inside-secure/safexcel_cipher.c
+++ b/drivers/crypto/inside-secure/safexcel_cipher.c
@@ -47,7 +47,7 @@ struct safexcel_cipher_ctx {
u32 mode;
enum safexcel_cipher_alg alg;
- char aead; /* !=0=AEAD, 2=IPSec ESP AEAD */
+ char aead; /* !=0=AEAD, 2=IPSec ESP AEAD, 3=IPsec ESP GMAC */
char xcm; /* 0=authenc, 1=GCM, 2 reserved for CCM */
__le32 key[16];
@@ -78,7 +78,7 @@ static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
u32 block_sz = 0;
if (ctx->mode == CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD ||
- ctx->aead == EIP197_AEAD_TYPE_IPSEC_ESP) {
+ ctx->aead & EIP197_AEAD_TYPE_IPSEC_ESP) { /* _ESP and _ESP_GMAC */
cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
/* 32 bit nonce */
@@ -219,7 +219,7 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
}
if (ctx->aead == EIP197_AEAD_TYPE_IPSEC_ESP) {
- /* For ESP mode, skip over the IV */
+ /* For ESP mode (and not GMAC), skip over the IV */
token[7].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
token[7].packet_length = EIP197_AEAD_IPSEC_IV_SIZE;
@@ -235,10 +235,18 @@ static void safexcel_aead_token(struct safexcel_cipher_ctx *ctx, u8 *iv,
token[10].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
token[10].packet_length = cryptlen;
token[10].stat = EIP197_TOKEN_STAT_LAST_HASH;
- token[10].instructions = EIP197_TOKEN_INS_LAST |
- EIP197_TOKEN_INS_TYPE_CRYPTO |
- EIP197_TOKEN_INS_TYPE_HASH |
- EIP197_TOKEN_INS_TYPE_OUTPUT;
+ if (unlikely(ctx->aead == EIP197_AEAD_TYPE_IPSEC_ESP_GMAC)) {
+ token[6].instructions = EIP197_TOKEN_INS_TYPE_HASH;
+ /* Do not send to crypt engine in case of GMAC */
+ token[10].instructions = EIP197_TOKEN_INS_LAST |
+ EIP197_TOKEN_INS_TYPE_HASH |
+ EIP197_TOKEN_INS_TYPE_OUTPUT;
+ } else {
+ token[10].instructions = EIP197_TOKEN_INS_LAST |
+ EIP197_TOKEN_INS_TYPE_CRYPTO |
+ EIP197_TOKEN_INS_TYPE_HASH |
+ EIP197_TOKEN_INS_TYPE_OUTPUT;
+ }
} else if (ctx->xcm != EIP197_XCM_MODE_CCM) {
token[6].stat = EIP197_TOKEN_STAT_LAST_HASH;
}
@@ -494,17 +502,21 @@ static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
ctx->hash_alg |
CONTEXT_CONTROL_SIZE(ctrl_size);
}
- if (sreq->direction == SAFEXCEL_ENCRYPT)
- cdesc->control_data.control0 |=
- (ctx->xcm == EIP197_XCM_MODE_CCM) ?
- CONTEXT_CONTROL_TYPE_HASH_ENCRYPT_OUT :
- CONTEXT_CONTROL_TYPE_ENCRYPT_HASH_OUT;
+ if (sreq->direction == SAFEXCEL_ENCRYPT &&
+ (ctx->xcm == EIP197_XCM_MODE_CCM ||
+ ctx->aead == EIP197_AEAD_TYPE_IPSEC_ESP_GMAC))
+ cdesc->control_data.control0 |=
+ CONTEXT_CONTROL_TYPE_HASH_ENCRYPT_OUT;
+ else if (sreq->direction == SAFEXCEL_ENCRYPT)
+ cdesc->control_data.control0 |=
+ CONTEXT_CONTROL_TYPE_ENCRYPT_HASH_OUT;
+ else if (ctx->xcm == EIP197_XCM_MODE_CCM)
+ cdesc->control_data.control0 |=
+ CONTEXT_CONTROL_TYPE_DECRYPT_HASH_IN;
else
cdesc->control_data.control0 |=
- (ctx->xcm == EIP197_XCM_MODE_CCM) ?
- CONTEXT_CONTROL_TYPE_DECRYPT_HASH_IN :
- CONTEXT_CONTROL_TYPE_HASH_DECRYPT_IN;
+ CONTEXT_CONTROL_TYPE_HASH_DECRYPT_IN;
} else {
if (sreq->direction == SAFEXCEL_ENCRYPT)
cdesc->control_data.control0 =
@@ -3494,3 +3506,47 @@ struct safexcel_alg_template safexcel_alg_rfc4106_gcm = {
},
},
};
+
+static int safexcel_rfc4543_gcm_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ if (authsize != GHASH_DIGEST_SIZE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int safexcel_rfc4543_gcm_cra_init(struct crypto_tfm *tfm)
+{
+ struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+ int ret;
+
+ ret = safexcel_aead_gcm_cra_init(tfm);
+ ctx->aead = EIP197_AEAD_TYPE_IPSEC_ESP_GMAC;
+ return ret;
+}
+
+struct safexcel_alg_template safexcel_alg_rfc4543_gcm = {
+ .type = SAFEXCEL_ALG_TYPE_AEAD,
+ .algo_mask = SAFEXCEL_ALG_AES | SAFEXCEL_ALG_GHASH,
+ .alg.aead = {
+ .setkey = safexcel_rfc4106_gcm_setkey,
+ .setauthsize = safexcel_rfc4543_gcm_setauthsize,
+ .encrypt = safexcel_rfc4106_encrypt,
+ .decrypt = safexcel_rfc4106_decrypt,
+ .ivsize = GCM_RFC4543_IV_SIZE,
+ .maxauthsize = GHASH_DIGEST_SIZE,
+ .base = {
+ .cra_name = "rfc4543(gcm(aes))",
+ .cra_driver_name = "safexcel-rfc4543-gcm-aes",
+ .cra_priority = SAFEXCEL_CRA_PRIORITY,
+ .cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_KERN_DRIVER_ONLY,
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
+ .cra_alignmask = 0,
+ .cra_init = safexcel_rfc4543_gcm_cra_init,
+ .cra_exit = safexcel_aead_gcm_cra_exit,
+ },
+ },
+};
--
1.8.3.1
