diff options
Diffstat (limited to 'include/crypto/blake2b.h')
| -rw-r--r-- | include/crypto/blake2b.h | 143 |
1 files changed, 121 insertions, 22 deletions
diff --git a/include/crypto/blake2b.h b/include/crypto/blake2b.h index dd7694477e50..3bc37fd103a7 100644 --- a/include/crypto/blake2b.h +++ b/include/crypto/blake2b.h @@ -7,20 +7,10 @@ #include <linux/types.h> #include <linux/string.h> -struct blake2b_state { - /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */ - u64 h[8]; - u64 t[2]; - /* The true state ends here. The rest is temporary storage. */ - u64 f[2]; -}; - enum blake2b_lengths { BLAKE2B_BLOCK_SIZE = 128, BLAKE2B_HASH_SIZE = 64, BLAKE2B_KEY_SIZE = 64, - BLAKE2B_STATE_SIZE = offsetof(struct blake2b_state, f), - BLAKE2B_DESC_SIZE = sizeof(struct blake2b_state), BLAKE2B_160_HASH_SIZE = 20, BLAKE2B_256_HASH_SIZE = 32, @@ -28,6 +18,25 @@ enum blake2b_lengths { BLAKE2B_512_HASH_SIZE = 64, }; +/** + * struct blake2b_ctx - Context for hashing a message with BLAKE2b + * @h: compression function state + * @t: block counter + * @f: finalization indicator + * @buf: partial block buffer; 'buflen' bytes are valid + * @buflen: number of bytes buffered in @buf + * @outlen: length of output hash value in bytes, at most BLAKE2B_HASH_SIZE + */ +struct blake2b_ctx { + /* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */ + u64 h[8]; + u64 t[2]; + u64 f[2]; + u8 buf[BLAKE2B_BLOCK_SIZE]; + unsigned int buflen; + unsigned int outlen; +}; + enum blake2b_iv { BLAKE2B_IV0 = 0x6A09E667F3BCC908ULL, BLAKE2B_IV1 = 0xBB67AE8584CAA73BULL, @@ -39,19 +48,109 @@ enum blake2b_iv { BLAKE2B_IV7 = 0x5BE0CD19137E2179ULL, }; -static inline void __blake2b_init(struct blake2b_state *state, size_t outlen, - size_t keylen) +static inline void __blake2b_init(struct blake2b_ctx *ctx, size_t outlen, + const void *key, size_t keylen) +{ + ctx->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen); + ctx->h[1] = BLAKE2B_IV1; + ctx->h[2] = BLAKE2B_IV2; + ctx->h[3] = BLAKE2B_IV3; + ctx->h[4] = BLAKE2B_IV4; + ctx->h[5] = BLAKE2B_IV5; + ctx->h[6] = BLAKE2B_IV6; + ctx->h[7] = BLAKE2B_IV7; + ctx->t[0] = 0; + ctx->t[1] = 0; + ctx->f[0] = 0; + ctx->f[1] = 0; + ctx->buflen = 0; + ctx->outlen = outlen; + if (keylen) { + memcpy(ctx->buf, key, keylen); + memset(&ctx->buf[keylen], 0, BLAKE2B_BLOCK_SIZE - keylen); + ctx->buflen = BLAKE2B_BLOCK_SIZE; + } +} + +/** + * blake2b_init() - Initialize a BLAKE2b context for a new message (unkeyed) + * @ctx: the context to initialize + * @outlen: length of output hash value in bytes, at most BLAKE2B_HASH_SIZE + * + * Context: Any context. + */ +static inline void blake2b_init(struct blake2b_ctx *ctx, size_t outlen) { - state->h[0] = BLAKE2B_IV0 ^ (0x01010000 | keylen << 8 | outlen); - state->h[1] = BLAKE2B_IV1; - state->h[2] = BLAKE2B_IV2; - state->h[3] = BLAKE2B_IV3; - state->h[4] = BLAKE2B_IV4; - state->h[5] = BLAKE2B_IV5; - state->h[6] = BLAKE2B_IV6; - state->h[7] = BLAKE2B_IV7; - state->t[0] = 0; - state->t[1] = 0; + __blake2b_init(ctx, outlen, NULL, 0); +} + +/** + * blake2b_init_key() - Initialize a BLAKE2b context for a new message (keyed) + * @ctx: the context to initialize + * @outlen: length of output hash value in bytes, at most BLAKE2B_HASH_SIZE + * @key: the key + * @keylen: the key length in bytes, at most BLAKE2B_KEY_SIZE + * + * Context: Any context. + */ +static inline void blake2b_init_key(struct blake2b_ctx *ctx, size_t outlen, + const void *key, size_t keylen) +{ + WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2B_HASH_SIZE || + !key || !keylen || keylen > BLAKE2B_KEY_SIZE)); + + __blake2b_init(ctx, outlen, key, keylen); +} + +/** + * blake2b_update() - Update a BLAKE2b context with message data + * @ctx: the context to update; must have been initialized + * @in: the message data + * @inlen: the data length in bytes + * + * This can be called any number of times. + * + * Context: Any context. + */ +void blake2b_update(struct blake2b_ctx *ctx, const u8 *in, size_t inlen); + +/** + * blake2b_final() - Finish computing a BLAKE2b hash + * @ctx: the context to finalize; must have been initialized + * @out: (output) the resulting BLAKE2b hash. Its length will be equal to the + * @outlen that was passed to blake2b_init() or blake2b_init_key(). + * + * After finishing, this zeroizes @ctx. So the caller does not need to do it. + * + * Context: Any context. + */ +void blake2b_final(struct blake2b_ctx *ctx, u8 *out); + +/** + * blake2b() - Compute BLAKE2b hash in one shot + * @key: the key, or NULL for an unkeyed hash + * @keylen: the key length in bytes (at most BLAKE2B_KEY_SIZE), or 0 for an + * unkeyed hash + * @in: the message data + * @inlen: the data length in bytes + * @out: (output) the resulting BLAKE2b hash, with length @outlen + * @outlen: length of output hash value in bytes, at most BLAKE2B_HASH_SIZE + * + * Context: Any context. + */ +static inline void blake2b(const u8 *key, size_t keylen, + const u8 *in, size_t inlen, + u8 *out, size_t outlen) +{ + struct blake2b_ctx ctx; + + WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen || + outlen > BLAKE2B_HASH_SIZE || keylen > BLAKE2B_KEY_SIZE || + (!key && keylen))); + + __blake2b_init(&ctx, outlen, key, keylen); + blake2b_update(&ctx, in, inlen); + blake2b_final(&ctx, out); } #endif /* _CRYPTO_BLAKE2B_H */ |