/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _CRYPTO_INTERNAL_CHACHA_H
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#define _CRYPTO_INTERNAL_CHACHA_H
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#include <crypto/chacha.h>
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#include <crypto/internal/skcipher.h>
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#include <linux/crypto.h>
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struct chacha_ctx {
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u32 key[8];
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int nrounds;
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};
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static inline int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keysize, int nrounds)
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{
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
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int i;
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if (keysize != CHACHA_KEY_SIZE)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(ctx->key); i++)
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ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));
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ctx->nrounds = nrounds;
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return 0;
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}
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static inline int chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keysize)
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{
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return chacha_setkey(tfm, key, keysize, 20);
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}
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static inline int chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keysize)
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{
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return chacha_setkey(tfm, key, keysize, 12);
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}
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#endif /* _CRYPTO_CHACHA_H */
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