From f9ee306fa2da3f5c2f0089a11ce53ccafb1546e8 Mon Sep 17 00:00:00 2001 From: Nelson Vides Date: Wed, 10 Feb 2021 20:13:20 +0100 Subject: [PATCH] Port pbkdf2 specifics from fast_scram --- .github/workflows/ci.yml | 28 ++ .gitignore | 30 ++ LICENSE | 191 +++++++++++++ Makefile | 31 ++ README.md | 57 ++++ benchmarks/bench.ex | 36 +++ c_src/fast_pbkdf2.c | 592 +++++++++++++++++++++++++++++++++++++++ mix.exs | 18 ++ mix.lock | 4 + rebar.config | 48 ++++ rebar.lock | 1 + src/fast_pbkdf2.app.src | 15 + src/fast_pbkdf2.erl | 51 ++++ test/erl_pbkdf2.erl | 36 +++ test/pbkdf2_SUITE.erl | 204 ++++++++++++++ 15 files changed, 1342 insertions(+) create mode 100644 .github/workflows/ci.yml create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README.md create mode 100644 benchmarks/bench.ex create mode 100644 c_src/fast_pbkdf2.c create mode 100644 mix.exs create mode 100644 mix.lock create mode 100644 rebar.config create mode 100644 rebar.lock create mode 100644 src/fast_pbkdf2.app.src create mode 100644 src/fast_pbkdf2.erl create mode 100644 test/erl_pbkdf2.erl create mode 100644 test/pbkdf2_SUITE.erl diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml new file mode 100644 index 0000000..545d6a9 --- /dev/null +++ b/.github/workflows/ci.yml @@ -0,0 +1,28 @@ +name: ci + +on: + push: + branches: [ master ] + pull_request: + branches: [ master ] + workflow_dispatch: + +jobs: + test: + name: OTP ${{matrix.otp}} + strategy: + matrix: + otp: ['23.2', '22.3', '21.3'] + runs-on: 'ubuntu-20.04' + steps: + - uses: actions/checkout@v2 + - uses: ErlGang/setup-erlang@v1.0.0 + with: + otp-version: ${{ matrix.otp }} + - run: make rebar3 + - run: make + - run: make test + - run: make dialyzer + - run: make codecov + - run: pip install --user codecov + - run: /home/runner/.local/bin/codecov diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..0154361 --- /dev/null +++ b/.gitignore @@ -0,0 +1,30 @@ +.rebar3 +_* +.eunit +*.o +*.d +*.beam +*.plt +*.swp +*.swo +.erlang.cookie +ebin +log +erl_crash.dump +.rebar +logs +_build +.idea +*.iml +rebar3.crashdump +*~ +*.vim +tags +priv/ +/deps/ +/doc/ +/.fetch +erl_crash.dump +*.ez +*.tar + diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..a2958c7 --- /dev/null +++ b/LICENSE @@ -0,0 +1,191 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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However, it doesn't really add much more entropy to the derived key to use outputs larger than the output of the underlying hash, so you might as well, use `pbkdf2` where dkLen is that of the hash's output, which is the same than `pbkdf2_block` with index `1`, which is simply the `pbkdf2/4` function. + +## Performance + +### The problem +PBKDF2 is a challenge derivation method, that is, it forces the client to compute a challenge in order to derive the desired password. But when the server implementation is slower than that of an attacker, it makes the server vulnerable to DoS by hogging itself with computations. We could see that on the CI and load-testing pipelines of [MongooseIM][MIM] for example. + +### The solution +Is partial. We don't expect to have the fastest implementation, as that would be purely C code on GPUs, so unfortunately an attacker will pretty much always have better chances there. _But_ we can make the computation cheap enough for us that other computations —like the load of a session establishment— will be more relevant than that of the challenge; and also that other defence mechanisms like IP blacklisting or traffic shaping, will fire in good time. + +### The outcome +On average it's 10x faster on the machines I've tested it (you can compare using the provided module in `./benchmarks/bench.ex`), but while the erlang implementation consumes memory linearly to the iteration count (1M it count with 120 clients quickly allocated 7GB of RAM, and 1M is common for password managers for example), the NIF implementation does not allocate any more memory. Also, the NIFS spend all of their time in user level alone, while the erlang one jumps to system calls in around ~2% of the time (I'd guess due to some heavy allocation and garbage collection patterns). + +## Credit where credit is due +The initial algorithm and optimisations were taken from Joseph Birr-Pixton's +[fastpbkdf2](https://github.com/ctz/fastpbkdf2)'s repository. + +## Read more: +* Password-Based Cryptography Specification (PBKDF2): [RFC8018](https://tools.ietf.org/html/rfc8018#section-5.2) +* HMAC: [RFC2104]( https://tools.ietf.org/html/rfc2104) +* SHAs and HMAC-SHA: [RFC6234](https://tools.ietf.org/html/rfc6234) + +[MIM]: https://github.com/esl/MongooseIM +[PBKDF2]: https://tools.ietf.org/html/rfc8018#section-5.2 diff --git a/benchmarks/bench.ex b/benchmarks/bench.ex new file mode 100644 index 0000000..79464c8 --- /dev/null +++ b/benchmarks/bench.ex @@ -0,0 +1,36 @@ +defmodule PBKDF2.Benchmarks do + def pbkdf2_input itCount do + password = :base64.encode(:crypto.strong_rand_bytes(10)) + salt = :base64.encode(:crypto.strong_rand_bytes(16)) + {password, salt, itCount} + end + + def pbkdf2 {password, salt, it_count} do + :fast_pbkdf2.pbkdf2(:sha256, password, salt, it_count) + end +end + +{:ok, :erl_pbkdf2} = :compile.file('./test/erl_pbkdf2.erl') + +Benchee.run( + %{ + "fast_pbkdf2" => fn {password, salt, it_count} -> + :fast_pbkdf2.pbkdf2(:sha256, password, salt, it_count) + end, + "erl_pbkdf2 " => fn {password, salt, it_count} -> + :erl_pbkdf2.pbkdf2_oneblock(:sha256, password, salt, it_count) + end + }, + inputs: %{ + "1. 8" => PBKDF2.Benchmarks.pbkdf2_input(8), + "2. 512" => PBKDF2.Benchmarks.pbkdf2_input(512), + "3. 4096" => PBKDF2.Benchmarks.pbkdf2_input(4096), + "4. 10000" => PBKDF2.Benchmarks.pbkdf2_input(10000), + "5. 160000" => PBKDF2.Benchmarks.pbkdf2_input(160000), + "6. 500000" => PBKDF2.Benchmarks.pbkdf2_input(500000) + }, + parallel: 12, + time: 5, + memory_time: 5 +) + diff --git a/c_src/fast_pbkdf2.c b/c_src/fast_pbkdf2.c new file mode 100644 index 0000000..680950e --- /dev/null +++ b/c_src/fast_pbkdf2.c @@ -0,0 +1,592 @@ +/* + * fast-pbkdf2 - Optimal PBKDF2-HMAC calculation + * Written in 2015 by Joseph Birr-Pixton + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the + * public domain worldwide. This software is distributed without any + * warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication + * along with this software. If not, see + * . + */ + +#include "erl_nif.h" + +#ifndef TIMESLICE_PERCENTAGE +#define TIMESLICE_PERCENTAGE 5 // announce a timeslice of 5 percent when indicated +#define ITERS_PER_SLOT 6 +/* On the single core of an 2,2 GHz Quad-Core Intel Core i7, in slightly below 1ms + * we achieve around 120 iterations for sha512. + * Also, we want to report percentage every 5% (TIMESLICE_PERCENTAGE). + * We therefore get that a slot in between iterations should take 6 iterations (ITERS_PER_SLOT). + */ +#endif + +#include +#include +#include +#include +#if defined(__GNUC__) +#include +#endif + +#include + +/* --- Common useful things --- */ + +static inline void write32_be(uint32_t n, uint8_t out[4]) +{ +#if defined(__GNUC__) && __GNUC__ >= 4 && __BYTE_ORDER == __LITTLE_ENDIAN + *(uint32_t *)(out) = __builtin_bswap32(n); +#else + out[0] = (n >> 24) & 0xff; + out[1] = (n >> 16) & 0xff; + out[2] = (n >> 8) & 0xff; + out[3] = n & 0xff; +#endif +} + +static inline void write64_be(uint64_t n, uint8_t out[8]) +{ +#if defined(__GNUC__) && __GNUC__ >= 4 && __BYTE_ORDER == __LITTLE_ENDIAN + *(uint64_t *)(out) = __builtin_bswap64(n); +#else + write32_be((n >> 32) & 0xffffffff, out); + write32_be(n & 0xffffffff, out + 4); +#endif +} + +/* Prepare block (of blocksz bytes) to contain md padding denoting a msg-size + * message (in bytes). block has a prefix of used bytes. + * Message length is expressed in 32 bits (so suitable for all sha1 and sha2 algorithms). */ +static inline void md_pad(uint8_t *block, size_t blocksz, size_t used, size_t msg) +{ + memset(block + used, 0, blocksz - used - 4); + block[used] = 0x80; + block += blocksz - 4; + write32_be((uint32_t) (msg * 8), block); +} + +/* Internal function/type names for hash-specific things. */ +#define XSTRINGIFY(s) STRINGIFY(s) +#define STRINGIFY(s) #s + +#define HMAC_CTX(_name) HMAC_ ## _name ## _ctx +#define HMAC_INIT(_name) HMAC_ ## _name ## _init +#define HMAC_UPDATE(_name) HMAC_ ## _name ## _update +#define HMAC_FINAL(_name) HMAC_ ## _name ## _final + +#define HMAC_CTX_ROUND(_name) HMAC_ ## _name ## _ctx_round // C struct +#define HMAC_CTX_ROUND_RES(_name) res_HMAC_ ## _name ## _ctx_round // Erlang Resource definition +#define HMAC_CTX_ROUND_NAME(_name) XSTRINGIFY(HMAC_CTX_ROUND(_name)) // Erlang atom-name + +#define PBKDF2_F(_name) pbkdf2_f_ ## _name +#define PBKDF2(_name) pbkdf2_ ## _name + +typedef struct { + ERL_NIF_TERM atom_sha; + ERL_NIF_TERM atom_sha224; + ERL_NIF_TERM atom_sha256; + ERL_NIF_TERM atom_sha384; + ERL_NIF_TERM atom_sha512; + ErlNifResourceType* HMAC_CTX_ROUND_RES(sha1); + ErlNifResourceType* HMAC_CTX_ROUND_RES(sha224); + ErlNifResourceType* HMAC_CTX_ROUND_RES(sha256); + ErlNifResourceType* HMAC_CTX_ROUND_RES(sha384); + ErlNifResourceType* HMAC_CTX_ROUND_RES(sha512); +} pbkdf2_st; + +/* This macro expands to decls for the whole implementation for a given + * hash function. Arguments are: + * + * _name like 'sha1', added to symbol names (e.g. sha256) + * _blocksz block size, in bytes (e.g. SHA256_CBLOCK) + * _hashsz digest output, in bytes (e.g. SHA256_DIGEST_LENGTH) + * _ctx hash context type (e.g. SHA256_Init) + * _init hash context initialisation function (e.g. SHA256_Update) + * args: (_ctx *c) + * _update hash context update function (e.g. SHA256_Update) + * args: (_ctx *c, const void *data, size_t ndata) + * _final hash context finish function (e.g. SHA256_Final) + * args: (void *out, _ctx *c) + * _xform hash context raw block update function (e.g. SHA256_Transform) + * args: (_ctx *c, const void *data) + * _xcpy hash context raw copy function (only need copy hash state) (e.g. sha256_cpy) + * args: (_ctx * restrict out, const _ctx *restrict in) + * _xtract hash context state extraction (e.g. sha256_extract) + * args: args (_ctx *restrict c, uint8_t *restrict out) + * _xxor hash context xor function (only need xor hash state) (e.g. sha256_xor) + * args: (_ctx *restrict out, const _ctx *restrict in) + * + * The resulting function is named PBKDF2(_name). + */ +#define DECL_PBKDF2(_name, _blocksz, _hashsz, _ctx, \ + _init, _update, _xform, _final, _xcpy, _xtract, _xxor) \ + \ + typedef struct { \ + _ctx inner; \ + _ctx outer; \ + } HMAC_CTX(_name); \ + \ + typedef struct { \ + HMAC_CTX(_name) startctx; \ + HMAC_CTX(_name) ctx; \ + _ctx result; \ + uint8_t Ublock[_blocksz]; \ + uint32_t iterations; \ + } HMAC_CTX_ROUND(_name); \ + \ + static inline void HMAC_INIT(_name)(HMAC_CTX(_name) *ctx, \ + const uint8_t *key, size_t nkey) \ + { \ + /* Prepare key: */ \ + uint8_t k[_blocksz]; \ + \ + /* Shorten long keys. */ \ + if (nkey > _blocksz) \ + { \ + _init(&ctx->inner); \ + _update(&ctx->inner, key, nkey); \ + _final(k, &ctx->inner); \ + key = k; \ + nkey = _hashsz; \ + } \ + \ + /* Standard doesn't cover case where blocksz < hashsz. */ \ + assert(nkey <= _blocksz); \ + \ + /* Right zero-pad short keys. */ \ + if (k != key) \ + memcpy(k, key, nkey); \ + if (_blocksz > nkey) \ + memset(k + nkey, 0, _blocksz - nkey); \ + \ + /* Start inner hash computation */ \ + uint8_t blk_inner[_blocksz]; \ + uint8_t blk_outer[_blocksz]; \ + \ + for (size_t i = 0; i < _blocksz; i++) \ + { \ + blk_inner[i] = 0x36 ^ k[i]; \ + blk_outer[i] = 0x5c ^ k[i]; \ + } \ + \ + _init(&ctx->inner); \ + _update(&ctx->inner, blk_inner, sizeof blk_inner); \ + \ + /* And outer. */ \ + _init(&ctx->outer); \ + _update(&ctx->outer, blk_outer, sizeof blk_outer); \ + } \ + \ + static inline void HMAC_UPDATE(_name)(HMAC_CTX(_name) *ctx, \ + const void *data, size_t ndata) \ + { \ + _update(&ctx->inner, data, ndata); \ + } \ + \ + static inline void HMAC_FINAL(_name)(HMAC_CTX(_name) *ctx, \ + uint8_t out[_hashsz]) \ + { \ + _final(out, &ctx->inner); \ + _update(&ctx->outer, out, _hashsz); \ + _final(out, &ctx->outer); \ + } \ + \ + /* --- PBKDF2 --- */ \ + ERL_NIF_TERM PBKDF2_F(_name)(ErlNifEnv *env, \ + int argc, const ERL_NIF_TERM argv[]) \ + { \ + pbkdf2_st *mod_st = enif_priv_data(env); \ + HMAC_CTX_ROUND(_name) *round_st; \ + enif_get_resource(env, argv[0], \ + mod_st->HMAC_CTX_ROUND_RES(_name), \ + ((void*) (&round_st))); \ + \ + while (1) { \ + for (uint32_t i = 0; i < ITERS_PER_SLOT && i < round_st->iterations-1; ++i) \ + { \ + /* Complete inner hash with previous U */ \ + _xcpy(&round_st->ctx.inner, &round_st->startctx.inner); \ + _xform(&round_st->ctx.inner, round_st->Ublock); \ + _xtract(&round_st->ctx.inner, round_st->Ublock); \ + /* Complete outer hash with inner output */ \ + _xcpy(&round_st->ctx.outer, &round_st->startctx.outer); \ + _xform(&round_st->ctx.outer, round_st->Ublock); \ + _xtract(&round_st->ctx.outer, round_st->Ublock); \ + _xxor(&round_st->result, &round_st->ctx.outer); \ + } \ + if (round_st->iterations <= ITERS_PER_SLOT) break; \ + round_st->iterations -= ITERS_PER_SLOT; \ + \ + /* Schedule again but with iterations decremented */ \ + if (enif_consume_timeslice(env, TIMESLICE_PERCENTAGE)) { \ + return enif_schedule_nif(env, HMAC_CTX_ROUND_NAME(_name), 0, \ + PBKDF2_F(_name), argc, argv); \ + } \ + } \ + \ + /* We're done, so we can release the resource */ \ + enif_release_resource(round_st); \ + /* Reform result into output buffer. */ \ + ERL_NIF_TERM erl_result; \ + unsigned char *output = enif_make_new_binary(env, _hashsz, &erl_result); \ + _xtract(&round_st->result, output); \ + return erl_result; \ + } \ + \ + static inline ERL_NIF_TERM PBKDF2(_name)(ErlNifEnv *env, \ + const uint8_t *pw, size_t npw, \ + const uint8_t *salt, size_t nsalt, \ + uint32_t iterations, uint32_t counter) \ + { \ + /* Retrieve the state resource descriptor from our priv data, */ \ + /* and allocate a new resource structure */ \ + pbkdf2_st *mod_st = enif_priv_data(env); \ + HMAC_CTX_ROUND(_name) *round_st = enif_alloc_resource( \ + mod_st->HMAC_CTX_ROUND_RES(_name), \ + sizeof(HMAC_CTX_ROUND(_name)) \ + ); \ + \ + HMAC_INIT(_name)(&round_st->startctx, pw, npw); \ + uint8_t countbuf[4]; \ + write32_be(counter, countbuf); \ + \ + /* Prepare loop-invariant padding block. */ \ + md_pad(round_st->Ublock, _blocksz, _hashsz, _blocksz + _hashsz); \ + \ + /* First iteration: \ + * U_1 = PRF(P, S || INT_32_BE(i)) \ + */ \ + round_st->ctx = round_st->startctx; \ + HMAC_UPDATE(_name)(&round_st->ctx, salt, nsalt); \ + HMAC_UPDATE(_name)(&round_st->ctx, countbuf, sizeof countbuf); \ + HMAC_FINAL(_name)(&round_st->ctx, round_st->Ublock); \ + round_st->result = round_st->ctx.outer; \ + round_st->iterations = iterations; \ + \ + ERL_NIF_TERM state_term = enif_make_resource(env, round_st); \ + const ERL_NIF_TERM tmp_argv[] = {state_term}; \ + return PBKDF2_F(_name)(env, 1, tmp_argv); \ + } + + +static inline void sha1_extract(SHA_CTX *restrict ctx, uint8_t *restrict out) +{ + write32_be(ctx->h0, out); + write32_be(ctx->h1, out + 4); + write32_be(ctx->h2, out + 8); + write32_be(ctx->h3, out + 12); + write32_be(ctx->h4, out + 16); +} + +static inline void sha1_cpy(SHA_CTX *restrict out, const SHA_CTX *restrict in) +{ + out->h0 = in->h0; + out->h1 = in->h1; + out->h2 = in->h2; + out->h3 = in->h3; + out->h4 = in->h4; +} + +static inline void sha1_xor(SHA_CTX *restrict out, const SHA_CTX *restrict in) +{ + out->h0 ^= in->h0; + out->h1 ^= in->h1; + out->h2 ^= in->h2; + out->h3 ^= in->h3; + out->h4 ^= in->h4; +} + +DECL_PBKDF2(sha1, + SHA_CBLOCK, + SHA_DIGEST_LENGTH, + SHA_CTX, + SHA1_Init, + SHA1_Update, + SHA1_Transform, + SHA1_Final, + sha1_cpy, + sha1_extract, + sha1_xor) + +static inline void sha224_extract(SHA256_CTX *restrict ctx, uint8_t *restrict out) +{ + write32_be(ctx->h[0], out); + write32_be(ctx->h[1], out + 4); + write32_be(ctx->h[2], out + 8); + write32_be(ctx->h[3], out + 12); + write32_be(ctx->h[4], out + 16); + write32_be(ctx->h[5], out + 20); + write32_be(ctx->h[6], out + 24); +} + +static inline void sha256_extract(SHA256_CTX *restrict ctx, uint8_t *restrict out) +{ + write32_be(ctx->h[0], out); + write32_be(ctx->h[1], out + 4); + write32_be(ctx->h[2], out + 8); + write32_be(ctx->h[3], out + 12); + write32_be(ctx->h[4], out + 16); + write32_be(ctx->h[5], out + 20); + write32_be(ctx->h[6], out + 24); + write32_be(ctx->h[7], out + 28); +} + +static inline void sha256_cpy(SHA256_CTX *restrict out, const SHA256_CTX *restrict in) +{ + out->h[0] = in->h[0]; + out->h[1] = in->h[1]; + out->h[2] = in->h[2]; + out->h[3] = in->h[3]; + out->h[4] = in->h[4]; + out->h[5] = in->h[5]; + out->h[6] = in->h[6]; + out->h[7] = in->h[7]; +} + +static inline void sha256_xor(SHA256_CTX *restrict out, const SHA256_CTX *restrict in) +{ + out->h[0] ^= in->h[0]; + out->h[1] ^= in->h[1]; + out->h[2] ^= in->h[2]; + out->h[3] ^= in->h[3]; + out->h[4] ^= in->h[4]; + out->h[5] ^= in->h[5]; + out->h[6] ^= in->h[6]; + out->h[7] ^= in->h[7]; +} + +DECL_PBKDF2(sha224, + SHA256_CBLOCK, + SHA224_DIGEST_LENGTH, + SHA256_CTX, + SHA224_Init, + SHA224_Update, + SHA256_Transform, + SHA224_Final, + sha256_cpy, + sha224_extract, + sha256_xor) + +DECL_PBKDF2(sha256, + SHA256_CBLOCK, + SHA256_DIGEST_LENGTH, + SHA256_CTX, + SHA256_Init, + SHA256_Update, + SHA256_Transform, + SHA256_Final, + sha256_cpy, + sha256_extract, + sha256_xor) + +static inline void sha384_extract(SHA512_CTX *restrict ctx, uint8_t *restrict out) +{ + write64_be(ctx->h[0], out); + write64_be(ctx->h[1], out + 8); + write64_be(ctx->h[2], out + 16); + write64_be(ctx->h[3], out + 24); + write64_be(ctx->h[4], out + 32); + write64_be(ctx->h[5], out + 40); +} + +static inline void sha512_extract(SHA512_CTX *restrict ctx, uint8_t *restrict out) +{ + write64_be(ctx->h[0], out); + write64_be(ctx->h[1], out + 8); + write64_be(ctx->h[2], out + 16); + write64_be(ctx->h[3], out + 24); + write64_be(ctx->h[4], out + 32); + write64_be(ctx->h[5], out + 40); + write64_be(ctx->h[6], out + 48); + write64_be(ctx->h[7], out + 56); +} + +static inline void sha512_cpy(SHA512_CTX *restrict out, const SHA512_CTX *restrict in) +{ + out->h[0] = in->h[0]; + out->h[1] = in->h[1]; + out->h[2] = in->h[2]; + out->h[3] = in->h[3]; + out->h[4] = in->h[4]; + out->h[5] = in->h[5]; + out->h[6] = in->h[6]; + out->h[7] = in->h[7]; +} + +static inline void sha512_xor(SHA512_CTX *restrict out, const SHA512_CTX *restrict in) +{ + out->h[0] ^= in->h[0]; + out->h[1] ^= in->h[1]; + out->h[2] ^= in->h[2]; + out->h[3] ^= in->h[3]; + out->h[4] ^= in->h[4]; + out->h[5] ^= in->h[5]; + out->h[6] ^= in->h[6]; + out->h[7] ^= in->h[7]; +} + +DECL_PBKDF2(sha384, + SHA512_CBLOCK, + SHA384_DIGEST_LENGTH, + SHA512_CTX, + SHA384_Init, + SHA384_Update, + SHA512_Transform, + SHA384_Final, + sha512_cpy, + sha384_extract, + sha512_xor) + +DECL_PBKDF2(sha512, + SHA512_CBLOCK, + SHA512_DIGEST_LENGTH, + SHA512_CTX, + SHA512_Init, + SHA512_Update, + SHA512_Transform, + SHA512_Final, + sha512_cpy, + sha512_extract, + sha512_xor) + +static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info) +{ + (void) load_info; + pbkdf2_st* mod_st = enif_alloc(sizeof(pbkdf2_st)); + if(mod_st == NULL) { + return 1; + } + + mod_st->atom_sha = enif_make_atom(env, "sha"); + mod_st->atom_sha224 = enif_make_atom(env, "sha224"); + mod_st->atom_sha256 = enif_make_atom(env, "sha256"); + mod_st->atom_sha384 = enif_make_atom(env, "sha384"); + mod_st->atom_sha512 = enif_make_atom(env, "sha512"); + + mod_st->HMAC_CTX_ROUND_RES(sha1) = enif_open_resource_type( + env, NULL, HMAC_CTX_ROUND_NAME(sha1), + NULL, ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL + ); + + mod_st->HMAC_CTX_ROUND_RES(sha224) = enif_open_resource_type( + env, NULL, HMAC_CTX_ROUND_NAME(sha224), + NULL, ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL + ); + + mod_st->HMAC_CTX_ROUND_RES(sha256) = enif_open_resource_type( + env, NULL, HMAC_CTX_ROUND_NAME(sha256), + NULL, ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL + ); + + mod_st->HMAC_CTX_ROUND_RES(sha384) = enif_open_resource_type( + env, NULL, HMAC_CTX_ROUND_NAME(sha384), + NULL, ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL + ); + + mod_st->HMAC_CTX_ROUND_RES(sha512) = enif_open_resource_type( + env, NULL, HMAC_CTX_ROUND_NAME(sha512), + NULL, ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL + ); + + *priv_data = (void*) mod_st; + + return 0; +} + +static int reload(ErlNifEnv* env, void** priv, ERL_NIF_TERM info) +{ + return 0; +} + +static int upgrade(ErlNifEnv* env, void** priv, void** old_priv, ERL_NIF_TERM info) +{ + return load(env, priv, info); +} + +static void unload(ErlNifEnv* env, void* priv) +{ + enif_free(priv); + return; +} + +ERL_NIF_TERM mk_error(ErlNifEnv* env, const char *error_msg) +{ + return enif_make_tuple2( + env, + enif_make_atom(env, "error"), + enif_make_atom(env, error_msg) + ); +} + +static ERL_NIF_TERM +pbkdf2_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]) +{ + if(argc != 5) + return enif_make_badarg(env); + + ErlNifBinary password; + if (!enif_inspect_binary(env, argv[1], &password)) + return mk_error(env, "bad_password"); + + ErlNifBinary salt; + if (!enif_inspect_binary(env, argv[2], &salt)) + return mk_error(env, "bad_salt"); + + int iteration_count; + if (!enif_get_int(env, argv[3], &iteration_count)) + return mk_error(env, "bad_iteration_count"); + if (iteration_count <= 0) + return mk_error(env, "bad_iteration_count"); + + int counter; + if (!enif_get_int(env, argv[4], &counter)) + return mk_error(env, "bad_block_counter"); + if (counter <= 0) + return mk_error(env, "bad_block_counter"); + + /** Calculates PBKDF2-HMAC-SHA + * @p npw bytes at @p pw are the password input. + * @p nsalt bytes at @p salt are the salt input. + * @p iterations is the PBKDF2 iteration count and must be non-zero. + */ + pbkdf2_st *mod_st = (pbkdf2_st*) enif_priv_data(env); + + if(enif_is_identical(argv[0], mod_st->atom_sha)) { + return PBKDF2(sha1)(env, + password.data, password.size, + salt.data, salt.size, + iteration_count, counter); + } else if(enif_is_identical(argv[0], mod_st->atom_sha224)) { + return PBKDF2(sha224)(env, + password.data, password.size, + salt.data, salt.size, + iteration_count, counter); + } else if(enif_is_identical(argv[0], mod_st->atom_sha256)) { + return PBKDF2(sha256)(env, + password.data, password.size, + salt.data, salt.size, + iteration_count, counter); + } else if(enif_is_identical(argv[0], mod_st->atom_sha384)) { + return PBKDF2(sha384)(env, + password.data, password.size, + salt.data, salt.size, + iteration_count, counter); + } else if(enif_is_identical(argv[0], mod_st->atom_sha512)) { + return PBKDF2(sha512)(env, + password.data, password.size, + salt.data, salt.size, + iteration_count, counter); + } else { + return mk_error(env, "bad_hash"); + } +} + +static ErlNifFunc fastpbkdf2_nif_funcs[] = { + {"pbkdf2_block", 5, pbkdf2_nif} +}; + +ERL_NIF_INIT(fast_pbkdf2, fastpbkdf2_nif_funcs, load, reload, upgrade, unload); diff --git a/mix.exs b/mix.exs new file mode 100644 index 0000000..b581df4 --- /dev/null +++ b/mix.exs @@ -0,0 +1,18 @@ +defmodule Fast_Pbkdf2.MixProject do + use Mix.Project + + def project do + [ + app: :fast_pbkdf2, + version: "0.1.0", + elixir: "~> 1.10", + deps: deps() + ] + end + + defp deps do + [ + {:benchee, "~> 1.0", only: :dev} + ] + end +end diff --git a/mix.lock b/mix.lock new file mode 100644 index 0000000..5aa28d0 --- /dev/null +++ b/mix.lock @@ -0,0 +1,4 @@ +%{ + "benchee": {:hex, :benchee, "1.0.1", "66b211f9bfd84bd97e6d1beaddf8fc2312aaabe192f776e8931cb0c16f53a521", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm", "3ad58ae787e9c7c94dd7ceda3b587ec2c64604563e049b2a0e8baafae832addb"}, + "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm", "ce708e5f094b9cd4e8f2be4f00d2f4250c4095be93f8cd6d018c753894885430"}, +} diff --git a/rebar.config b/rebar.config new file mode 100644 index 0000000..f98cd40 --- /dev/null +++ b/rebar.config @@ -0,0 +1,48 @@ +{deps, []}. + +{profiles, [ + {test, [ + {erl_opts, [debug_info, {d, 'STATISTICS'}]}, + {deps, [ + {statistics, {git, "https://github.com/NelsonVides/statistics.git", {branch, "master"}}}, + {base16, "1.0.0"}, + {proper, "1.3.0"} + ]}, + {plugins, [ + {rebar3_codecov, {git, "https://github.com/esl/rebar3_codecov.git", {ref, "6bd31cc"}}} + ]} + ]} + ] +}. + +{plugins, [pc, rebar3_hex]}. + +{artifacts, ["priv/fast_pbkdf2.so"]}. + +{port_specs, + [ + { + % Any arch + ".*", + % Create library + "priv/fast_pbkdf2.so", + % From files + ["c_src/*.c"], + % Using options + [ {env, [{"CFLAGS", "$CFLAGS -std=c99 -O3 -g -Wall -Wextra -fPIC"}, + {"LDLIBS", "$LDLIBS -lcrypto"}, + {"DRV_LINK_TEMPLATE", "$DRV_LINK_TEMPLATE $LDLIBS"}]}] + } + ]}. + +{provider_hooks, + [ + {post, + [ + {compile, {pc, compile}}, + {clean, {pc, clean}} + ]} + ]}. + +{cover_enabled, true}. +{cover_export_enabled, true}. diff --git a/rebar.lock b/rebar.lock new file mode 100644 index 0000000..57afcca --- /dev/null +++ b/rebar.lock @@ -0,0 +1 @@ +[]. diff --git a/src/fast_pbkdf2.app.src b/src/fast_pbkdf2.app.src new file mode 100644 index 0000000..c38c686 --- /dev/null +++ b/src/fast_pbkdf2.app.src @@ -0,0 +1,15 @@ +{application, fast_pbkdf2, + [{description, "Erlang's best pbkdf2 implementation"}, + {vsn, "1.0.0"}, + {registered, []}, + {applications, + [kernel, + stdlib, + crypto + ]}, + {env,[]}, + {modules, []}, + {licenses, ["Apache 2.0"]}, + {links, [{"GitHub", "https://github.com/esl/fast_pbkdf2/"}]}, + {exclude_files, ["c_src/fast_pbkdf2.d"]} + ]}. diff --git a/src/fast_pbkdf2.erl b/src/fast_pbkdf2.erl new file mode 100644 index 0000000..4583314 --- /dev/null +++ b/src/fast_pbkdf2.erl @@ -0,0 +1,51 @@ +-module(fast_pbkdf2). +-on_load(load/0). + +-type sha_type() :: crypto:sha1() | crypto:sha2(). + +-export([pbkdf2/4, pbkdf2/5]). + +%%% @doc +%%% This function calculates the pbkdf2 algorithm where dkLen is simply assumed to be that of the +%%% underlying hash function, a sane default. +%%% @end +-spec pbkdf2(sha_type(), binary(), binary(), non_neg_integer()) -> binary(). +pbkdf2(Hash, Password, Salt, IterationCount) -> + pbkdf2_block(Hash, Password, Salt, IterationCount, 1). + +%%% @doc +%%% This function allows to customise the desired dkLen parameter for pbkdf2. +%%% @end +-spec pbkdf2(sha_type(), binary(), binary(), non_neg_integer(), non_neg_integer()) -> binary(). +pbkdf2(Hash, Password, Salt, IterationCount, DkLen) -> + pbkdf2(Hash, Password, Salt, IterationCount, DkLen, 1, [], 0). + +%%%=================================================================== +%%% Helper function +%%%=================================================================== +pbkdf2(_Hash, _Password, _Salt, _IterationCount, DkLen, _BlockIndex, Acc, Len) when Len >= DkLen -> + Bin = iolist_to_binary(lists:reverse(Acc)), + binary:part(Bin, 0, DkLen); +pbkdf2(Hash, Password, Salt, IterationCount, DkLen, BlockIndex, Acc, Len) -> + Block = pbkdf2_block(Hash, Password, Salt, IterationCount, BlockIndex), + pbkdf2(Hash, Password, Salt, IterationCount, DkLen, BlockIndex + 1, [Block | Acc], byte_size(Block) + Len). + +%%%=================================================================== +%%% NIF +%%%=================================================================== +-spec pbkdf2_block(sha_type(), binary(), binary(), non_neg_integer(), non_neg_integer()) -> binary(). +pbkdf2_block(_Hash, _Password, _Salt, _IterationCount, _BlockSize) -> + erlang:nif_error(not_loaded). + +-spec load() -> any(). +load() -> + code:ensure_loaded(crypto), + PrivDir = case code:priv_dir(?MODULE) of + {error, _} -> + EbinDir = filename:dirname(code:which(?MODULE)), + AppPath = filename:dirname(EbinDir), + filename:join(AppPath, "priv"); + Path -> + Path + end, + erlang:load_nif(filename:join(PrivDir, ?MODULE_STRING), none). diff --git a/test/erl_pbkdf2.erl b/test/erl_pbkdf2.erl new file mode 100644 index 0000000..fadc875 --- /dev/null +++ b/test/erl_pbkdf2.erl @@ -0,0 +1,36 @@ +-module(erl_pbkdf2). + +-export([pbkdf2_oneblock/4]). + +-type sha_type() :: crypto:sha1() | crypto:sha2(). + +-spec pbkdf2_oneblock(sha_type(), binary(), binary(), non_neg_integer()) -> binary(). +pbkdf2_oneblock(Sha, Password, Salt, 1) -> + crypto_hmac(Sha, Password, <>); +pbkdf2_oneblock(Sha, Password, Salt, IterationCount) + when is_integer(IterationCount), IterationCount > 1 -> + U1 = crypto_hmac(Sha, Password, <>), + mask(U1, iteration(Sha, Password, U1, IterationCount - 1)). + +-spec iteration(sha_type(), binary(), binary(), non_neg_integer()) -> binary(). +iteration(Sha, Password, UPrev, 1) -> + crypto_hmac(Sha, Password, UPrev); +iteration(Sha, Password, UPrev, IterationCount) -> + U = crypto_hmac(Sha, Password, UPrev), + mask(U, iteration(Sha, Password, U, IterationCount - 1)). + +-spec mask(binary(), binary()) -> binary(). +mask(Key, Data) -> + KeySize = size(Key) * 8, + <> = Key, + <> = Data, + C = A bxor B, + <>. + +-if(?OTP_RELEASE >= 22). +crypto_hmac(Sha, Bin1, Bin2) -> + crypto:mac(hmac, Sha, Bin1, Bin2). +-else. +crypto_hmac(Sha, Bin1, Bin2) -> + crypto:hmac(Sha, Bin1, Bin2). +-endif. diff --git a/test/pbkdf2_SUITE.erl b/test/pbkdf2_SUITE.erl new file mode 100644 index 0000000..61fb712 --- /dev/null +++ b/test/pbkdf2_SUITE.erl @@ -0,0 +1,204 @@ +-module(pbkdf2_SUITE). + +%% API +-export([all/0, + groups/0, + init_per_suite/1, + end_per_suite/1, + init_per_group/2, + end_per_group/2, + init_per_testcase/2, + end_per_testcase/2]). + +%% test cases +-export([ + erlang_and_nif_are_equivalent_sha1/1, + erlang_and_nif_are_equivalent_sha224/1, + erlang_and_nif_are_equivalent_sha256/1, + erlang_and_nif_are_equivalent_sha384/1, + erlang_and_nif_are_equivalent_sha512/1, + realtime_test/1 + ]). +-export([ + test_vector_sha1_1/1, + test_vector_sha1_2/1, + test_vector_sha1_3/1, + test_vector_sha1_4/1, + test_vector_sha1_5/1, + test_vector_sha256_1/1, + test_vector_sha256_2/1, + test_vector_sha256_3/1, + test_vector_sha256_4/1, + test_vector_sha256_5/1, + test_vector_sha256_6/1 + ]). + +-include_lib("common_test/include/ct.hrl"). +-include_lib("proper/include/proper.hrl"). +-include_lib("eunit/include/eunit.hrl"). + +all() -> + [ + {group, equivalents}, + {group, test_vectors}, + realtime_test + ]. + +groups() -> + [ + {equivalents, [parallel], + [ + erlang_and_nif_are_equivalent_sha1, + erlang_and_nif_are_equivalent_sha224, + erlang_and_nif_are_equivalent_sha256, + erlang_and_nif_are_equivalent_sha384, + erlang_and_nif_are_equivalent_sha512 + ]}, + {test_vectors, [parallel], + [ + test_vector_sha1_1, + test_vector_sha1_2, + test_vector_sha1_3, + test_vector_sha1_4, + test_vector_sha1_5, + test_vector_sha256_1, + test_vector_sha256_2, + test_vector_sha256_3, + test_vector_sha256_4, + test_vector_sha256_5, + test_vector_sha256_6 + ]} + ]. + +%%%=================================================================== +%%% Overall setup/teardown +%%%=================================================================== +init_per_suite(Config) -> + Config. + +end_per_suite(_Config) -> + ok. + +%%%=================================================================== +%%% Group specific setup/teardown +%%%=================================================================== +init_per_group(_Groupname, Config) -> + Config. + +end_per_group(_Groupname, _Config) -> + ok. + +%%%=================================================================== +%%% Testcase specific setup/teardown +%%%=================================================================== +init_per_testcase(_TestCase, Config) -> + Config. + +end_per_testcase(_TestCase, _Config) -> + ok. + +%%%=================================================================== +%%% Individual Test Cases (from groups() definition) +%%%=================================================================== + +erlang_and_nif_are_equivalent_sha1(_Config) -> + erlang_and_nif_are_equivalent_(sha). + +erlang_and_nif_are_equivalent_sha224(_Config) -> + erlang_and_nif_are_equivalent_(sha224). + +erlang_and_nif_are_equivalent_sha256(_Config) -> + erlang_and_nif_are_equivalent_(sha256). + +erlang_and_nif_are_equivalent_sha384(_Config) -> + erlang_and_nif_are_equivalent_(sha384). + +erlang_and_nif_are_equivalent_sha512(_Config) -> + erlang_and_nif_are_equivalent_(sha512). + +erlang_and_nif_are_equivalent_(Sha) -> + Prop = ?FORALL({Pass, Salt, Count}, + {binary(), binary(), range(2,20000)}, + fast_pbkdf2:pbkdf2(Sha, Pass, Salt, Count) + =:= erl_pbkdf2:pbkdf2_oneblock(Sha, Pass, Salt, Count) + ), + ?assert(proper:quickcheck(Prop, [verbose, long_result, + {numtests, 100}, + {start_size, 2}, + {max_size, 64}])). + + +%% Taken from the official RFC https://www.ietf.org/rfc/rfc6070.txt + +test_vector_sha1_1(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>,<<"salt">>,1,20, + base16:decode(<<"0c60c80f961f0e71f3a9b524af6012062fe037a6">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha, P, S, It, DkLen)). + +test_vector_sha1_2(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>,<<"salt">>,2,20, + base16:decode(<<"ea6c014dc72d6f8ccd1ed92ace1d41f0d8de8957">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha, P, S, It, DkLen)). + +test_vector_sha1_3(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>,<<"salt">>,4096,20, + base16:decode(<<"4b007901b765489abead49d926f721d065a429c1">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha, P, S, It, DkLen)). + +test_vector_sha1_4(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>,<<"salt">>,16777216,20, + base16:decode(<<"eefe3d61cd4da4e4e9945b3d6ba2158c2634e984">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha, P, S, It, DkLen)). + +test_vector_sha1_5(_Config) -> + {P,S,It,DkLen,Result} = {<<"passwordPASSWORDpassword">>,<<"saltSALTsaltSALTsaltSALTsaltSALTsalt">>,4096,25, + base16:decode(<<"3d2eec4fe41c849b80c8d83662c0e44a8b291a964cf2f07038">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha, P, S, It, DkLen)). + + +%% Taken from https://stackoverflow.com/a/5136918/8853275 +test_vector_sha256_1(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>, <<"salt">>, 1, 32, + base16:decode(<<"120fb6cffcf8b32c43e7225256c4f837a86548c92ccc35480805987cb70be17b">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + +test_vector_sha256_2(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>, <<"salt">>, 2, 32, + base16:decode(<<"ae4d0c95af6b46d32d0adff928f06dd02a303f8ef3c251dfd6e2d85a95474c43">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + +test_vector_sha256_3(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>, <<"salt">>, 4096, 32, + base16:decode(<<"c5e478d59288c841aa530db6845c4c8d962893a001ce4e11a4963873aa98134a">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + +test_vector_sha256_4(_Config) -> + {P,S,It,DkLen,Result} = {<<"password">>, <<"salt">>, 16777216, 32, + base16:decode(<<"cf81c66fe8cfc04d1f31ecb65dab4089f7f179e89b3b0bcb17ad10e3ac6eba46">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + +test_vector_sha256_5(_Config) -> + {P,S,It,DkLen,Result} = {<<"passwordPASSWORDpassword">>,<<"saltSALTsaltSALTsaltSALTsaltSALTsalt">>,4096,40, + base16:decode(<<"348c89dbcbd32b2f32d814b8116e84cf2b17347ebc1800181c4e2a1fb8dd53e1c635518c7dac47e9">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + +test_vector_sha256_6(_Config) -> + {P,S,It,DkLen,Result} = {<<"pass\0word">>, <<"sa\0lt">>, 4096, 16, + base16:decode(<<"89b69d0516f829893c696226650a8687">>)}, + ?assertEqual(Result, fast_pbkdf2:pbkdf2(sha256, P, S, It, DkLen)). + + +-ifdef(STATISTICS). +realtime_test(_Config) -> + % Allocate two large binaries + A = crypto:strong_rand_bytes(64), + B = crypto:strong_rand_bytes(64), + Fun = fun() -> + fast_pbkdf2:pbkdf2(512, A, B, 10000) + end, + #{mean := AverageJitter} = stats_latency:realtime_latency_on_load(Fun, 20, 5000), + ?assert(AverageJitter < 50). +-else. +realtime_test(_Config) -> + ok. +-endif.