From 31d7247da57226e847f0f102a10c27c0722c429b Mon Sep 17 00:00:00 2001 From: Martin Willi Date: Thu, 16 Jul 2015 19:14:00 +0200 Subject: [PATCH] crypto: chacha20 - Export common ChaCha20 helpers As architecture specific drivers need a software fallback, export a ChaCha20 en-/decryption function together with some helpers in a header file. Signed-off-by: Martin Willi Signed-off-by: Herbert Xu --- crypto/chacha20_generic.c | 28 ++++++++++++---------------- crypto/chacha20poly1305.c | 3 +-- include/crypto/chacha20.h | 25 +++++++++++++++++++++++++ 3 files changed, 38 insertions(+), 18 deletions(-) create mode 100644 include/crypto/chacha20.h diff --git a/crypto/chacha20_generic.c b/crypto/chacha20_generic.c index fa42e708aa96..da9c89968223 100644 --- a/crypto/chacha20_generic.c +++ b/crypto/chacha20_generic.c @@ -13,14 +13,7 @@ #include #include #include - -#define CHACHA20_NONCE_SIZE 16 -#define CHACHA20_KEY_SIZE 32 -#define CHACHA20_BLOCK_SIZE 64 - -struct chacha20_ctx { - u32 key[8]; -}; +#include static inline u32 rotl32(u32 v, u8 n) { @@ -108,7 +101,7 @@ static void chacha20_docrypt(u32 *state, u8 *dst, const u8 *src, } } -static void chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv) +void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv) { static const char constant[16] = "expand 32-byte k"; @@ -129,8 +122,9 @@ static void chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv) state[14] = le32_to_cpuvp(iv + 8); state[15] = le32_to_cpuvp(iv + 12); } +EXPORT_SYMBOL_GPL(crypto_chacha20_init); -static int chacha20_setkey(struct crypto_tfm *tfm, const u8 *key, +int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keysize) { struct chacha20_ctx *ctx = crypto_tfm_ctx(tfm); @@ -144,8 +138,9 @@ static int chacha20_setkey(struct crypto_tfm *tfm, const u8 *key, return 0; } +EXPORT_SYMBOL_GPL(crypto_chacha20_setkey); -static int chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, +int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct blkcipher_walk walk; @@ -155,7 +150,7 @@ static int chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, blkcipher_walk_init(&walk, dst, src, nbytes); err = blkcipher_walk_virt_block(desc, &walk, CHACHA20_BLOCK_SIZE); - chacha20_init(state, crypto_blkcipher_ctx(desc->tfm), walk.iv); + crypto_chacha20_init(state, crypto_blkcipher_ctx(desc->tfm), walk.iv); while (walk.nbytes >= CHACHA20_BLOCK_SIZE) { chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr, @@ -172,6 +167,7 @@ static int chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, return err; } +EXPORT_SYMBOL_GPL(crypto_chacha20_crypt); static struct crypto_alg alg = { .cra_name = "chacha20", @@ -187,11 +183,11 @@ static struct crypto_alg alg = { .blkcipher = { .min_keysize = CHACHA20_KEY_SIZE, .max_keysize = CHACHA20_KEY_SIZE, - .ivsize = CHACHA20_NONCE_SIZE, + .ivsize = CHACHA20_IV_SIZE, .geniv = "seqiv", - .setkey = chacha20_setkey, - .encrypt = chacha20_crypt, - .decrypt = chacha20_crypt, + .setkey = crypto_chacha20_setkey, + .encrypt = crypto_chacha20_crypt, + .decrypt = crypto_chacha20_crypt, }, }, }; diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c index 86260937b0f3..410554d3a1ff 100644 --- a/crypto/chacha20poly1305.c +++ b/crypto/chacha20poly1305.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -23,8 +24,6 @@ #define POLY1305_BLOCK_SIZE 16 #define POLY1305_DIGEST_SIZE 16 #define POLY1305_KEY_SIZE 32 -#define CHACHA20_KEY_SIZE 32 -#define CHACHA20_IV_SIZE 16 #define CHACHAPOLY_IV_SIZE 12 struct chachapoly_instance_ctx { diff --git a/include/crypto/chacha20.h b/include/crypto/chacha20.h new file mode 100644 index 000000000000..274bbaeeed0f --- /dev/null +++ b/include/crypto/chacha20.h @@ -0,0 +1,25 @@ +/* + * Common values for the ChaCha20 algorithm + */ + +#ifndef _CRYPTO_CHACHA20_H +#define _CRYPTO_CHACHA20_H + +#include +#include + +#define CHACHA20_IV_SIZE 16 +#define CHACHA20_KEY_SIZE 32 +#define CHACHA20_BLOCK_SIZE 64 + +struct chacha20_ctx { + u32 key[8]; +}; + +void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv); +int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key, + unsigned int keysize); +int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, + struct scatterlist *src, unsigned int nbytes); + +#endif -- 2.20.1