crypto: rng - RNG interface and implementation
This patch adds a random number generator interface as well as a
cryptographic pseudo-random number generator based on AES. It is
meant to be used in cases where a deterministic CPRNG is required.
One of the first applications will be as an input in the IPsec IV
generation process.
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 81d994a..3d2317e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -38,6 +38,7 @@
#define CRYPTO_ALG_TYPE_DIGEST 0x00000008
#define CRYPTO_ALG_TYPE_HASH 0x00000009
#define CRYPTO_ALG_TYPE_AHASH 0x0000000a
+#define CRYPTO_ALG_TYPE_RNG 0x0000000c
#define CRYPTO_ALG_TYPE_HASH_MASK 0x0000000e
#define CRYPTO_ALG_TYPE_AHASH_MASK 0x0000000c
@@ -113,6 +114,7 @@
struct crypto_blkcipher;
struct crypto_hash;
struct crypto_ahash;
+struct crypto_rng;
struct crypto_tfm;
struct crypto_type;
struct aead_givcrypt_request;
@@ -298,6 +300,15 @@
unsigned int slen, u8 *dst, unsigned int *dlen);
};
+struct rng_alg {
+ int (*rng_make_random)(struct crypto_rng *tfm, u8 *rdata,
+ unsigned int dlen);
+ int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+
+ unsigned int seedsize;
+};
+
+
#define cra_ablkcipher cra_u.ablkcipher
#define cra_aead cra_u.aead
#define cra_blkcipher cra_u.blkcipher
@@ -306,6 +317,7 @@
#define cra_hash cra_u.hash
#define cra_ahash cra_u.ahash
#define cra_compress cra_u.compress
+#define cra_rng cra_u.rng
struct crypto_alg {
struct list_head cra_list;
@@ -333,6 +345,7 @@
struct hash_alg hash;
struct ahash_alg ahash;
struct compress_alg compress;
+ struct rng_alg rng;
} cra_u;
int (*cra_init)(struct crypto_tfm *tfm);
@@ -438,6 +451,12 @@
u8 *dst, unsigned int *dlen);
};
+struct rng_tfm {
+ int (*rng_gen_random)(struct crypto_rng *tfm, u8 *rdata,
+ unsigned int dlen);
+ int (*rng_reset)(struct crypto_rng *tfm, u8 *seed, unsigned int slen);
+};
+
#define crt_ablkcipher crt_u.ablkcipher
#define crt_aead crt_u.aead
#define crt_blkcipher crt_u.blkcipher
@@ -445,6 +464,7 @@
#define crt_hash crt_u.hash
#define crt_ahash crt_u.ahash
#define crt_compress crt_u.compress
+#define crt_rng crt_u.rng
struct crypto_tfm {
@@ -458,6 +478,7 @@
struct hash_tfm hash;
struct ahash_tfm ahash;
struct compress_tfm compress;
+ struct rng_tfm rng;
} crt_u;
struct crypto_alg *__crt_alg;
@@ -489,6 +510,10 @@
struct crypto_tfm base;
};
+struct crypto_rng {
+ struct crypto_tfm base;
+};
+
enum {
CRYPTOA_UNSPEC,
CRYPTOA_ALG,