From 73046cd8097b6b37ee1e003c8c1ee83c6136ae48 Mon Sep 17 00:00:00 2001 From: Frank Denis Date: Thu, 8 Oct 2026 13:15:44 +0200 Subject: [PATCH] std.crypto.sha3: add MiniSHAKE (smaller version of TurboSHAKE) New construction proposed by the Keccak designers: MiniSHAKE. Similar to TurboSHAKE, but with a smaller state, designed for hashing many short messages. We already have all the generic machinery in place to support new SHA3/SHAKE variants, so this is a trivial addition. --- lib/std/crypto/benchmark.zig | 2 ++ lib/std/crypto/sha3.zig | 59 ++++++++++++++++++++++++++++++++---- 2 files changed, 55 insertions(+), 6 deletions(-) diff --git a/lib/std/crypto/benchmark.zig b/lib/std/crypto/benchmark.zig index 014a7d3558e1a2cd0d3131be834261d97416b613..4eb6d974e441b4a829bd082c7253329f04aa4777 100644 --- a/lib/std/crypto/benchmark.zig +++ b/lib/std/crypto/benchmark.zig @@ -31,6 +31,8 @@ const hashes = [_]Crypto{ Crypto{ .ty = crypto.hash.sha3.Shake256, .name = "shake-256" }, Crypto{ .ty = crypto.hash.sha3.TurboShake128(null), .name = "turboshake-128" }, Crypto{ .ty = crypto.hash.sha3.TurboShake256(null), .name = "turboshake-256" }, + Crypto{ .ty = crypto.hash.sha3.MiniShake128(null), .name = "minishake-128" }, + Crypto{ .ty = crypto.hash.sha3.MiniShake256(null), .name = "minishake-256" }, Crypto{ .ty = crypto.hash.sha3.KT128, .name = "kt128" }, Crypto{ .ty = crypto.hash.blake2.Blake2s256, .name = "blake2s" }, Crypto{ .ty = crypto.hash.blake2.Blake2b512, .name = "blake2b" }, diff --git a/lib/std/crypto/sha3.zig b/lib/std/crypto/sha3.zig index 5c0eb697b0c8a1472f76413e7c511b6c20db7a09..a706a1fbcdf97a6a160db5fd77cf29ebebdf3b0d 100644 --- a/lib/std/crypto/sha3.zig +++ b/lib/std/crypto/sha3.zig @@ -46,6 +46,28 @@ pub fn TurboShake256(comptime delim: ?u7) type { return TurboShake(256, delim); } +/// MiniSHAKE128 is a XOF (a secure hash function with a variable output length), with a 128 bit security level. +/// It works like TurboSHAKE128, with a permutation half the size. +/// +/// It was designed for hashing many short messages inside zero-knowledge proofs. +/// Note: on 64-bit CPUs, it is about as fast as TurboSHAKE128 for inputs up to 67 bytes, and much slower for longer ones. +/// +/// The delimiter is 0x01 by default, but can be changed for domain separation. +pub fn MiniShake128(comptime delim: ?u7) type { + return MiniShake(128, delim); +} + +/// MiniSHAKE256 is a XOF (a secure hash function with a variable output length), with a 256 bit security level. +/// It works like TurboSHAKE256, with a permutation half the size. +/// +/// It was designed for hashing many short messages inside zero-knowledge proofs. +/// Note: on 64-bit CPUs, it is much slower than TurboSHAKE256, even for short inputs. +/// +/// The delimiter is 0x01 by default, but can be changed for domain separation. +pub fn MiniShake256(comptime delim: ?u7) type { + return MiniShake(256, delim); +} + /// A generic Keccak hash function. pub fn Keccak(comptime f: u11, comptime output_bits: u11, comptime default_delim: u8, comptime rounds: u5) type { comptime assert(output_bits > 0 and output_bits * 2 < f and output_bits % 8 == 0); // invalid output length @@ -97,7 +119,7 @@ pub fn Keccak(comptime f: u11, comptime output_bits: u11, comptime default_delim /// The SHAKE extendable output hash function. pub fn Shake(comptime security_level: u11) type { - return ShakeLike(security_level, 0x1f, 24); + return ShakeLike(1600, security_level, 0x1f, 24); } /// The TurboSHAKE extendable output hash function. @@ -108,11 +130,24 @@ pub fn TurboShake(comptime security_level: u11, comptime delim: ?u7) type { comptime assert(security_level <= 256); const d = delim orelse 0x1f; comptime assert(d >= 0x01); // delimiter must be >= 1 - return ShakeLike(security_level, d, 12); + return ShakeLike(1600, security_level, d, 12); } -fn ShakeLike(comptime security_level: u11, comptime default_delim: u8, comptime rounds: u5) type { - const f = 1600; +/// The MiniSHAKE extendable output hash function. +/// It is TurboSHAKE with an 800-bit permutation instead of a 1600-bit one. +/// The security level must be a multiple of 4, up to 256. +/// +/// The delimiter is 0x01 by default, but can be changed for domain separation. +/// +/// https://eprint.iacr.org/2026/2363 +pub fn MiniShake(comptime security_level: u11, comptime delim: ?u7) type { + comptime assert(security_level > 0 and security_level <= 256 and security_level % 4 == 0); + const d = delim orelse 0x01; + comptime assert(d >= 0x01); + return ShakeLike(800, security_level, d, 12); +} + +fn ShakeLike(comptime f: u11, comptime security_level: u11, comptime default_delim: u8, comptime rounds: u5) type { const State = KeccakState(f, security_level * 2, rounds); return struct { @@ -124,7 +159,7 @@ fn ShakeLike(comptime security_level: u11, comptime default_delim: u8, comptime padded: bool = false, /// The recommended output length, in bytes. - pub const digest_length = security_level / 8 * 2; + pub const digest_length = security_level * 2 / 8; /// The block length, or rate, in bytes. pub const block_length = State.rate; /// The delimiter can be overwritten in the options. @@ -202,7 +237,7 @@ pub fn CShake(comptime security_level: u11, comptime fname: ?[]const u8) type { fn CShakeLike(comptime security_level: u11, comptime default_delim: u8, comptime rounds: u5, comptime fname: ?[]const u8) type { return struct { - const Shaker = ShakeLike(security_level, default_delim, rounds); + const Shaker = ShakeLike(1600, security_level, default_delim, rounds); shaker: Shaker, /// The recommended output length, in bytes. @@ -682,6 +717,18 @@ test "TurboSHAKE-128" { try htest.assertEqual("8ec9c66465ed0d4a6c35d13506718d687a25cb05c74cca1e42501abd83874a67", &out); } +test "MiniSHAKE-128" { + var out: [32]u8 = undefined; + MiniShake128(null).hash("", &out, .{}); + try htest.assertEqual("4e21f95d5dae60ddca7bc29b5a0da731d710b91f7e1effdb7bbd1055fd74618c", &out); +} + +test "MiniSHAKE-256" { + var out: [64]u8 = undefined; + MiniShake256(null).hash("", &out, .{}); + try htest.assertEqual("1e56563204eef4cef068b1666eec7ef033c43b70b8133d020773e6197dc7b61101e1b28360a9e589757371d7e3db8e1dface3d5661d39ab1c969850e50f550cc", &out); +} + test "SHA-3 with streaming" { var msg: [613]u8 = [613]u8{ 0x97, 0xd1, 0x2d, 0x1a, 0x16, 0x2d, 0x36, 0x4d, 0x20, 0x62, 0x19, 0x0b, 0x14, 0x93, 0xbb, 0xf8, 0x5b, 0xea, 0x04, 0xc2, 0x61, 0x8e, 0xd6, 0x08, 0x81, 0xa1, 0x1d, 0x73, 0x27, 0x48, 0xbf, 0xa4, 0xba, 0xb1, 0x9a, 0x48, 0x9c, 0xf9, 0x9b, 0xff, 0x34, 0x48, 0xa9, 0x75, 0xea, 0xc8, 0xa3, 0x48, 0x24, 0x9d, 0x75, 0x27, 0x48, 0xec, 0x03, 0xb0, 0xbb, 0xdf, 0x33, 0x90, 0xe3, 0x93, 0xed, 0x68, 0x24, 0x39, 0x12, 0xdf, 0xea, 0xee, 0x8c, 0x9f, 0x96, 0xde, 0x42, 0x46, 0x8c, 0x2b, 0x17, 0x83, 0x36, 0xfb, 0xf4, 0xf7, 0xff, 0x79, 0xb9, 0x45, 0x41, 0xc9, 0x56, 0x1a, 0x6b, 0x0c, 0xa4, 0x1a, 0xdd, 0x6b, 0x95, 0xe8, 0x03, 0x0f, 0x09, 0x29, 0x40, 0x1b, 0xea, 0x87, 0xfa, 0xb9, 0x18, 0xa9, 0x95, 0x07, 0x7c, 0x2f, 0x7c, 0x33, 0xfb, 0xc5, 0x11, 0x5e, 0x81, 0x0e, 0xbc, 0xae, 0xec, 0xb3, 0xe1, 0x4a, 0x26, 0x56, 0xe8, 0x5b, 0x11, 0x9d, 0x37, 0x06, 0x9b, 0x34, 0x31, 0x6e, 0xa3, 0xba, 0x41, 0xbc, 0x11, 0xd8, 0xc5, 0x15, 0xc9, 0x30, 0x2c, 0x9b, 0xb6, 0x71, 0xd8, 0x7c, 0xbc, 0x38, 0x2f, 0xd5, 0xbd, 0x30, 0x96, 0xd4, 0xa3, 0x00, 0x77, 0x9d, 0x55, 0x4a, 0x33, 0x53, 0xb6, 0xb3, 0x35, 0x1b, 0xae, 0xe5, 0xdc, 0x22, 0x23, 0x85, 0x95, 0x88, 0xf9, 0x3b, 0xbf, 0x74, 0x13, 0xaa, 0xcb, 0x0a, 0x60, 0x79, 0x13, 0x79, 0xc0, 0x4a, 0x02, 0xdb, 0x1c, 0xc9, 0xff, 0x60, 0x57, 0x9a, 0x70, 0x28, 0x58, 0x60, 0xbc, 0x57, 0x07, 0xc7, 0x47, 0x1a, 0x45, 0x71, 0x76, 0x94, 0xfb, 0x05, 0xad, 0xec, 0x12, 0x29, 0x5a, 0x44, 0x6a, 0x81, 0xd9, 0xc6, 0xf0, 0xb6, 0x9b, 0x97, 0x83, 0x69, 0xfb, 0xdc, 0x0d, 0x4a, 0x67, 0xbc, 0x72, 0xf5, 0x43, 0x5e, 0x9b, 0x13, 0xf2, 0xe4, 0x6d, 0x49, 0xdb, 0x76, 0xcb, 0x42, 0x6a, 0x3c, 0x9f, 0xa1, 0xfe, 0x5e, 0xca, 0x0a, 0xfc, 0xfa, 0x39, 0x27, 0xd1, 0x3c, 0xcb, 0x9a, 0xde, 0x4c, 0x6b, 0x09, 0x8b, 0x49, 0xfd, 0x1e, 0x3d, 0x5e, 0x67, 0x7c, 0x57, 0xad, 0x90, 0xcc, 0x46, 0x5f, 0x5c, 0xae, 0x6a, 0x9c, 0xb2, 0xcd, 0x2c, 0x89, 0x78, 0xcf, 0xf1, 0x49, 0x96, 0x55, 0x1e, 0x04, 0xef, 0x0e, 0x1c, 0xde, 0x6c, 0x96, 0x51, 0x00, 0xee, 0x9a, 0x1f, 0x8d, 0x61, 0xbc, 0xeb, 0xb1, 0xa6, 0xa5, 0x21, 0x8b, 0xa7, 0xf8, 0x25, 0x41, 0x48, 0x62, 0x5b, 0x01, 0x6c, 0x7c, 0x2a, 0xe8, 0xff, 0xf9, 0xf9, 0x1f, 0xe2, 0x79, 0x2e, 0xd1, 0xff, 0xa3, 0x2e, 0x1c, 0x3a, 0x1a, 0x5d, 0x2b, 0x7b, 0x87, 0x25, 0x22, 0xa4, 0x90, 0xea, 0x26, 0x9d, 0xdd, 0x13, 0x60, 0x4c, 0x10, 0x03, 0xf6, 0x99, 0xd3, 0x21, 0x0c, 0x69, 0xc6, 0xd8, 0xc8, 0x9e, 0x94, 0x89, 0x51, 0x21, 0xe3, 0x9a, 0xcd, 0xda, 0x54, 0x72, 0x64, 0xae, 0x94, 0x79, 0x36, 0x81, 0x44, 0x14, 0x6d, 0x3a, 0x0e, 0xa6, 0x30, 0xbf, 0x95, 0x99, 0xa6, 0xf5, 0x7f, 0x4f, 0xef, 0xc6, 0x71, 0x2f, 0x36, 0x13, 0x14, 0xa2, 0x9d, 0xc2, 0x0c, 0x0d, 0x4e, 0xc0, 0x02, 0xd3, 0x6f, 0xee, 0x98, 0x5e, 0x24, 0x31, 0x74, 0x11, 0x96, 0x6e, 0x43, 0x57, 0xe8, 0x8e, 0xa0, 0x8d, 0x3d, 0x79, 0x38, 0x20, 0xc2, 0x0f, 0xb4, 0x75, 0x99, 0x3b, 0xb1, 0xf0, 0xe8, 0xe1, 0xda, 0xf9, 0xd4, 0xe6, 0xd6, 0xf4, 0x8a, 0x32, 0x4a, 0x4a, 0x25, 0xa8, 0xd9, 0x60, 0xd6, 0x33, 0x31, 0x97, 0xb9, 0xb6, 0xed, 0x5f, 0xfc, 0x15, 0xbd, 0x13, 0xc0, 0x3a, 0x3f, 0x1f, 0x2d, 0x09, 0x1d, 0xeb, 0x69, 0x6a, 0xfe, 0xd7, 0x95, 0x3e, 0x8a, 0x4e, 0xe1, 0x6e, 0x61, 0xb2, 0x6c, 0xe3, 0x2b, 0x70, 0x60, 0x7e, 0x8c, 0xe4, 0xdd, 0x27, 0x30, 0x7e, 0x0d, 0xc7, 0xb7, 0x9a, 0x1a, 0x3c, 0xcc, 0xa7, 0x22, 0x77, 0x14, 0x05, 0x50, 0x57, 0x31, 0x1b, 0xc8, 0xbf, 0xce, 0x52, 0xaf, 0x9c, 0x8e, 0x10, 0x2e, 0xd2, 0x16, 0xb6, 0x6e, 0x43, 0x10, 0xaf, 0x8b, 0xde, 0x1d, 0x60, 0xb2, 0x7d, 0xe6, 0x2f, 0x08, 0x10, 0x12, 0x7e, 0xb4, 0x76, 0x45, 0xb6, 0xd8, 0x9b, 0x26, 0x40, 0xa1, 0x63, 0x5c, 0x7a, 0x2a, 0xb1, 0x8c, 0xd6, 0xa4, 0x6f, 0x5a, 0xae, 0x33, 0x7e, 0x6d, 0x71, 0xf5, 0xc8, 0x6d, 0x80, 0x1c, 0x35, 0xfc, 0x3f, 0xc1, 0xa6, 0xc6, 0x1a, 0x15, 0x04, 0x6d, 0x76, 0x38, 0x32, 0x95, 0xb2, 0x51, 0x1a, 0xe9, 0x3e, 0x89, 0x9f, 0x0c, 0x79 }; var out: [Sha3_256.digest_length]u8 = undefined; -- 2.54.0