crypto: speck - export common helpers
Export the Speck constants and transform context and the ->setkey(), ->encrypt(), and ->decrypt() functions so that they can be reused by the ARM NEON implementation of Speck-XTS. The generic key expansion code will be reused because it is not performance-critical and is not vectorizable, while the generic encryption and decryption functions are needed as fallbacks and for the XTS tweak encryption. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
Eric Biggers
Herbert Xu
parent
da7a0ab5b4
commit
c8c36413ca
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@ -24,6 +24,7 @@
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*/
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#include <asm/unaligned.h>
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#include <crypto/speck.h>
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#include <linux/bitops.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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@ -31,22 +32,6 @@
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/* Speck128 */
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#define SPECK128_BLOCK_SIZE 16
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#define SPECK128_128_KEY_SIZE 16
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#define SPECK128_128_NROUNDS 32
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#define SPECK128_192_KEY_SIZE 24
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#define SPECK128_192_NROUNDS 33
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#define SPECK128_256_KEY_SIZE 32
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#define SPECK128_256_NROUNDS 34
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struct speck128_tfm_ctx {
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u64 round_keys[SPECK128_256_NROUNDS];
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int nrounds;
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};
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static __always_inline void speck128_round(u64 *x, u64 *y, u64 k)
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{
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*x = ror64(*x, 8);
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@ -65,9 +50,9 @@ static __always_inline void speck128_unround(u64 *x, u64 *y, u64 k)
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*x = rol64(*x, 8);
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}
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static void speck128_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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void crypto_speck128_encrypt(const struct speck128_tfm_ctx *ctx,
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u8 *out, const u8 *in)
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{
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const struct speck128_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u64 y = get_unaligned_le64(in);
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u64 x = get_unaligned_le64(in + 8);
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int i;
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@ -78,10 +63,16 @@ static void speck128_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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put_unaligned_le64(y, out);
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put_unaligned_le64(x, out + 8);
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}
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EXPORT_SYMBOL_GPL(crypto_speck128_encrypt);
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static void speck128_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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static void speck128_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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crypto_speck128_encrypt(crypto_tfm_ctx(tfm), out, in);
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}
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void crypto_speck128_decrypt(const struct speck128_tfm_ctx *ctx,
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u8 *out, const u8 *in)
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{
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const struct speck128_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u64 y = get_unaligned_le64(in);
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u64 x = get_unaligned_le64(in + 8);
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int i;
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@ -92,11 +83,16 @@ static void speck128_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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put_unaligned_le64(y, out);
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put_unaligned_le64(x, out + 8);
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}
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EXPORT_SYMBOL_GPL(crypto_speck128_decrypt);
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static int speck128_setkey(struct crypto_tfm *tfm, const u8 *key,
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static void speck128_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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crypto_speck128_decrypt(crypto_tfm_ctx(tfm), out, in);
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}
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int crypto_speck128_setkey(struct speck128_tfm_ctx *ctx, const u8 *key,
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unsigned int keylen)
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{
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struct speck128_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u64 l[3];
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u64 k;
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int i;
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@ -138,22 +134,16 @@ static int speck128_setkey(struct crypto_tfm *tfm, const u8 *key,
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_speck128_setkey);
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static int speck128_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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return crypto_speck128_setkey(crypto_tfm_ctx(tfm), key, keylen);
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}
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/* Speck64 */
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#define SPECK64_BLOCK_SIZE 8
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#define SPECK64_96_KEY_SIZE 12
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#define SPECK64_96_NROUNDS 26
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#define SPECK64_128_KEY_SIZE 16
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#define SPECK64_128_NROUNDS 27
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struct speck64_tfm_ctx {
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u32 round_keys[SPECK64_128_NROUNDS];
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int nrounds;
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};
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static __always_inline void speck64_round(u32 *x, u32 *y, u32 k)
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{
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*x = ror32(*x, 8);
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@ -172,9 +162,9 @@ static __always_inline void speck64_unround(u32 *x, u32 *y, u32 k)
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*x = rol32(*x, 8);
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}
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static void speck64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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void crypto_speck64_encrypt(const struct speck64_tfm_ctx *ctx,
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u8 *out, const u8 *in)
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{
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const struct speck64_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 y = get_unaligned_le32(in);
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u32 x = get_unaligned_le32(in + 4);
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int i;
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@ -185,10 +175,16 @@ static void speck64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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put_unaligned_le32(y, out);
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put_unaligned_le32(x, out + 4);
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}
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EXPORT_SYMBOL_GPL(crypto_speck64_encrypt);
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static void speck64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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static void speck64_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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crypto_speck64_encrypt(crypto_tfm_ctx(tfm), out, in);
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}
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void crypto_speck64_decrypt(const struct speck64_tfm_ctx *ctx,
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u8 *out, const u8 *in)
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{
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const struct speck64_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 y = get_unaligned_le32(in);
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u32 x = get_unaligned_le32(in + 4);
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int i;
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@ -199,11 +195,16 @@ static void speck64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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put_unaligned_le32(y, out);
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put_unaligned_le32(x, out + 4);
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}
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EXPORT_SYMBOL_GPL(crypto_speck64_decrypt);
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static int speck64_setkey(struct crypto_tfm *tfm, const u8 *key,
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static void speck64_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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crypto_speck64_decrypt(crypto_tfm_ctx(tfm), out, in);
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}
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int crypto_speck64_setkey(struct speck64_tfm_ctx *ctx, const u8 *key,
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unsigned int keylen)
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{
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struct speck64_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 l[3];
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u32 k;
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int i;
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@ -236,6 +237,13 @@ static int speck64_setkey(struct crypto_tfm *tfm, const u8 *key,
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_speck64_setkey);
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static int speck64_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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return crypto_speck64_setkey(crypto_tfm_ctx(tfm), key, keylen);
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}
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/* Algorithm definitions */
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@ -0,0 +1,62 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Common values for the Speck algorithm
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*/
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#ifndef _CRYPTO_SPECK_H
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#define _CRYPTO_SPECK_H
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#include <linux/types.h>
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/* Speck128 */
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#define SPECK128_BLOCK_SIZE 16
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#define SPECK128_128_KEY_SIZE 16
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#define SPECK128_128_NROUNDS 32
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#define SPECK128_192_KEY_SIZE 24
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#define SPECK128_192_NROUNDS 33
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#define SPECK128_256_KEY_SIZE 32
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#define SPECK128_256_NROUNDS 34
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struct speck128_tfm_ctx {
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u64 round_keys[SPECK128_256_NROUNDS];
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int nrounds;
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};
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void crypto_speck128_encrypt(const struct speck128_tfm_ctx *ctx,
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u8 *out, const u8 *in);
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void crypto_speck128_decrypt(const struct speck128_tfm_ctx *ctx,
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u8 *out, const u8 *in);
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int crypto_speck128_setkey(struct speck128_tfm_ctx *ctx, const u8 *key,
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unsigned int keysize);
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/* Speck64 */
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#define SPECK64_BLOCK_SIZE 8
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#define SPECK64_96_KEY_SIZE 12
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#define SPECK64_96_NROUNDS 26
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#define SPECK64_128_KEY_SIZE 16
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#define SPECK64_128_NROUNDS 27
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struct speck64_tfm_ctx {
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u32 round_keys[SPECK64_128_NROUNDS];
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int nrounds;
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};
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void crypto_speck64_encrypt(const struct speck64_tfm_ctx *ctx,
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u8 *out, const u8 *in);
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void crypto_speck64_decrypt(const struct speck64_tfm_ctx *ctx,
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u8 *out, const u8 *in);
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int crypto_speck64_setkey(struct speck64_tfm_ctx *ctx, const u8 *key,
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unsigned int keysize);
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#endif /* _CRYPTO_SPECK_H */
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