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crypto/sha3_generic.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Cryptographic API. * * SHA-3, as specified in |
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* https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf |
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* * SHA-3 code by Jeff Garzik <jeff@garzik.org> |
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* Ard Biesheuvel <ard.biesheuvel@linaro.org> |
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*/ #include <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> #include <crypto/sha3.h> |
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#include <asm/unaligned.h> |
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/* |
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* On some 32-bit architectures (h8300), GCC ends up using |
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* over 1 KB of stack if we inline the round calculation into the loop * in keccakf(). On the other hand, on 64-bit architectures with plenty * of [64-bit wide] general purpose registers, not inlining it severely * hurts performance. So let's use 64-bitness as a heuristic to decide * whether to inline or not. */ #ifdef CONFIG_64BIT #define SHA3_INLINE inline #else #define SHA3_INLINE noinline #endif |
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#define KECCAK_ROUNDS 24 |
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static const u64 keccakf_rndc[24] = { |
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0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL, 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL, 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL, 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL |
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}; |
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/* update the state with given number of rounds */ |
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static SHA3_INLINE void keccakf_round(u64 st[25]) |
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{ |
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u64 t[5], tt, bc[5]; |
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/* Theta */ bc[0] = st[0] ^ st[5] ^ st[10] ^ st[15] ^ st[20]; bc[1] = st[1] ^ st[6] ^ st[11] ^ st[16] ^ st[21]; bc[2] = st[2] ^ st[7] ^ st[12] ^ st[17] ^ st[22]; bc[3] = st[3] ^ st[8] ^ st[13] ^ st[18] ^ st[23]; bc[4] = st[4] ^ st[9] ^ st[14] ^ st[19] ^ st[24]; t[0] = bc[4] ^ rol64(bc[1], 1); t[1] = bc[0] ^ rol64(bc[2], 1); t[2] = bc[1] ^ rol64(bc[3], 1); t[3] = bc[2] ^ rol64(bc[4], 1); t[4] = bc[3] ^ rol64(bc[0], 1); st[0] ^= t[0]; /* Rho Pi */ tt = st[1]; st[ 1] = rol64(st[ 6] ^ t[1], 44); st[ 6] = rol64(st[ 9] ^ t[4], 20); st[ 9] = rol64(st[22] ^ t[2], 61); st[22] = rol64(st[14] ^ t[4], 39); st[14] = rol64(st[20] ^ t[0], 18); st[20] = rol64(st[ 2] ^ t[2], 62); st[ 2] = rol64(st[12] ^ t[2], 43); st[12] = rol64(st[13] ^ t[3], 25); st[13] = rol64(st[19] ^ t[4], 8); st[19] = rol64(st[23] ^ t[3], 56); st[23] = rol64(st[15] ^ t[0], 41); st[15] = rol64(st[ 4] ^ t[4], 27); st[ 4] = rol64(st[24] ^ t[4], 14); st[24] = rol64(st[21] ^ t[1], 2); st[21] = rol64(st[ 8] ^ t[3], 55); st[ 8] = rol64(st[16] ^ t[1], 45); st[16] = rol64(st[ 5] ^ t[0], 36); st[ 5] = rol64(st[ 3] ^ t[3], 28); st[ 3] = rol64(st[18] ^ t[3], 21); st[18] = rol64(st[17] ^ t[2], 15); st[17] = rol64(st[11] ^ t[1], 10); st[11] = rol64(st[ 7] ^ t[2], 6); st[ 7] = rol64(st[10] ^ t[0], 3); st[10] = rol64( tt ^ t[1], 1); /* Chi */ bc[ 0] = ~st[ 1] & st[ 2]; bc[ 1] = ~st[ 2] & st[ 3]; bc[ 2] = ~st[ 3] & st[ 4]; bc[ 3] = ~st[ 4] & st[ 0]; bc[ 4] = ~st[ 0] & st[ 1]; st[ 0] ^= bc[ 0]; st[ 1] ^= bc[ 1]; st[ 2] ^= bc[ 2]; st[ 3] ^= bc[ 3]; st[ 4] ^= bc[ 4]; bc[ 0] = ~st[ 6] & st[ 7]; bc[ 1] = ~st[ 7] & st[ 8]; bc[ 2] = ~st[ 8] & st[ 9]; bc[ 3] = ~st[ 9] & st[ 5]; bc[ 4] = ~st[ 5] & st[ 6]; st[ 5] ^= bc[ 0]; st[ 6] ^= bc[ 1]; st[ 7] ^= bc[ 2]; st[ 8] ^= bc[ 3]; st[ 9] ^= bc[ 4]; bc[ 0] = ~st[11] & st[12]; bc[ 1] = ~st[12] & st[13]; bc[ 2] = ~st[13] & st[14]; bc[ 3] = ~st[14] & st[10]; bc[ 4] = ~st[10] & st[11]; st[10] ^= bc[ 0]; st[11] ^= bc[ 1]; st[12] ^= bc[ 2]; st[13] ^= bc[ 3]; st[14] ^= bc[ 4]; bc[ 0] = ~st[16] & st[17]; bc[ 1] = ~st[17] & st[18]; bc[ 2] = ~st[18] & st[19]; bc[ 3] = ~st[19] & st[15]; bc[ 4] = ~st[15] & st[16]; st[15] ^= bc[ 0]; st[16] ^= bc[ 1]; st[17] ^= bc[ 2]; st[18] ^= bc[ 3]; st[19] ^= bc[ 4]; bc[ 0] = ~st[21] & st[22]; bc[ 1] = ~st[22] & st[23]; bc[ 2] = ~st[23] & st[24]; bc[ 3] = ~st[24] & st[20]; bc[ 4] = ~st[20] & st[21]; st[20] ^= bc[ 0]; st[21] ^= bc[ 1]; st[22] ^= bc[ 2]; st[23] ^= bc[ 3]; st[24] ^= bc[ 4]; } |
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static void keccakf(u64 st[25]) |
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{ int round; |
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for (round = 0; round < KECCAK_ROUNDS; round++) { keccakf_round(st); |
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/* Iota */ st[0] ^= keccakf_rndc[round]; } } |
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int crypto_sha3_init(struct shash_desc *desc) |
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{ struct sha3_state *sctx = shash_desc_ctx(desc); |
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unsigned int digest_size = crypto_shash_digestsize(desc->tfm); |
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sctx->rsiz = 200 - 2 * digest_size; sctx->rsizw = sctx->rsiz / 8; sctx->partial = 0; |
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memset(sctx->st, 0, sizeof(sctx->st)); |
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return 0; } |
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EXPORT_SYMBOL(crypto_sha3_init); |
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int crypto_sha3_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) { struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int done; const u8 *src; done = 0; src = data; if ((sctx->partial + len) > (sctx->rsiz - 1)) { if (sctx->partial) { done = -sctx->partial; memcpy(sctx->buf + sctx->partial, data, done + sctx->rsiz); src = sctx->buf; } do { unsigned int i; for (i = 0; i < sctx->rsizw; i++) |
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sctx->st[i] ^= get_unaligned_le64(src + 8 * i); |
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keccakf(sctx->st); done += sctx->rsiz; src = data + done; } while (done + (sctx->rsiz - 1) < len); sctx->partial = 0; } memcpy(sctx->buf + sctx->partial, src, len - done); sctx->partial += (len - done); return 0; } |
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EXPORT_SYMBOL(crypto_sha3_update); |
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int crypto_sha3_final(struct shash_desc *desc, u8 *out) |
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{ struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int i, inlen = sctx->partial; |
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unsigned int digest_size = crypto_shash_digestsize(desc->tfm); __le64 *digest = (__le64 *)out; |
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sctx->buf[inlen++] = 0x06; memset(sctx->buf + inlen, 0, sctx->rsiz - inlen); sctx->buf[sctx->rsiz - 1] |= 0x80; for (i = 0; i < sctx->rsizw; i++) |
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sctx->st[i] ^= get_unaligned_le64(sctx->buf + 8 * i); |
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keccakf(sctx->st); |
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for (i = 0; i < digest_size / 8; i++) put_unaligned_le64(sctx->st[i], digest++); |
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if (digest_size & 4) put_unaligned_le32(sctx->st[i], (__le32 *)digest); |
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memset(sctx, 0, sizeof(*sctx)); return 0; } |
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EXPORT_SYMBOL(crypto_sha3_final); |
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static struct shash_alg algs[] = { { .digestsize = SHA3_224_DIGEST_SIZE, |
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.init = crypto_sha3_init, .update = crypto_sha3_update, .final = crypto_sha3_final, |
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.descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-224", .base.cra_driver_name = "sha3-224-generic", |
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.base.cra_blocksize = SHA3_224_BLOCK_SIZE, .base.cra_module = THIS_MODULE, }, { .digestsize = SHA3_256_DIGEST_SIZE, |
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.init = crypto_sha3_init, .update = crypto_sha3_update, .final = crypto_sha3_final, |
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.descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-256", .base.cra_driver_name = "sha3-256-generic", |
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.base.cra_blocksize = SHA3_256_BLOCK_SIZE, .base.cra_module = THIS_MODULE, }, { .digestsize = SHA3_384_DIGEST_SIZE, |
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.init = crypto_sha3_init, .update = crypto_sha3_update, .final = crypto_sha3_final, |
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.descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-384", .base.cra_driver_name = "sha3-384-generic", |
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.base.cra_blocksize = SHA3_384_BLOCK_SIZE, .base.cra_module = THIS_MODULE, }, { .digestsize = SHA3_512_DIGEST_SIZE, |
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.init = crypto_sha3_init, .update = crypto_sha3_update, .final = crypto_sha3_final, |
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.descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-512", .base.cra_driver_name = "sha3-512-generic", |
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.base.cra_blocksize = SHA3_512_BLOCK_SIZE, .base.cra_module = THIS_MODULE, } }; |
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static int __init sha3_generic_mod_init(void) { |
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return crypto_register_shashes(algs, ARRAY_SIZE(algs)); |
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} static void __exit sha3_generic_mod_fini(void) { |
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); |
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} |
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subsys_initcall(sha3_generic_mod_init); |
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module_exit(sha3_generic_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm"); MODULE_ALIAS_CRYPTO("sha3-224"); MODULE_ALIAS_CRYPTO("sha3-224-generic"); MODULE_ALIAS_CRYPTO("sha3-256"); MODULE_ALIAS_CRYPTO("sha3-256-generic"); MODULE_ALIAS_CRYPTO("sha3-384"); MODULE_ALIAS_CRYPTO("sha3-384-generic"); MODULE_ALIAS_CRYPTO("sha3-512"); MODULE_ALIAS_CRYPTO("sha3-512-generic"); |