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Merge pull request #27 from zanebeckwith/libsodium-randombytes
Copy Libsodium's randombytes API and use for prng seeding
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| #!/bin/bash | ||
| # Copyright 2017 Xaptum, Inc. | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License | ||
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|
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| if [[ $# -ne 1 ]]; then | ||
| echo "usage: $0 <absolute-path-to-libsodium-installation-directory>" | ||
| exit 1 | ||
| fi | ||
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| version=1.0.13 | ||
| install_dir="$1" | ||
| wget https://download.libsodium.org/libsodium/releases/libsodium-${version}.tar.gz | ||
| tar xvfz libsodium-${version}.tar.gz | ||
| cd libsodium-${version} | ||
| ./configure --prefix=$install_dir | ||
| make | ||
| make install |
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| /****************************************************************************** | ||
| * | ||
| * Copyright 2017 Xaptum, Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License | ||
| * | ||
| *****************************************************************************/ | ||
|
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| #ifndef ECDAA_PRNG_H | ||
| #define ECDAA_PRNG_H | ||
| #pragma once | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| #include <amcl/randapi.h> | ||
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| #include <stddef.h> | ||
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| #define AMCL_SEED_SIZE 128 // As recommended in AMCL's "rand.c" | ||
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| enum ecdaa_prng_initialized { | ||
| ECDAA_PRNG_INITIALIZED_NO = 0, | ||
| ECDAA_PRNG_INITIALIZED_YES | ||
| }; | ||
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| /* | ||
| * Wrapper around AMCL's pseudo-random-number-generator. | ||
| * | ||
| * For the safe operation of this library, | ||
| * all `ecdaa_prng`s MUST first be properly seeded | ||
| * via a call to `ecdaa_prng_init` | ||
| * or `ecdaa_prng_init_custom` before first use. | ||
| */ | ||
| struct ecdaa_prng { | ||
| enum ecdaa_prng_initialized initialized; | ||
| csprng impl; | ||
| }; | ||
|
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| /* | ||
| * Accessor for the underlying AMCL csprng in a `ecdaa_prng`. | ||
| * | ||
| * Checks that `ecdaa_prng` was initialized before returning. | ||
| * If not, calls `abort()`. | ||
| */ | ||
| csprng *get_csprng(struct ecdaa_prng *prng); | ||
|
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| /* | ||
| * Securely-clears memory used by a `ecdaa_prng`. | ||
| * | ||
| * To be used when finished with a `ecdaa_prng`. | ||
| * | ||
| * Does not do any heap deallocation. | ||
| */ | ||
| void ecdaa_prng_free(struct ecdaa_prng *prng); | ||
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| #ifndef DISABLE_LIBSODIUM_RNG_SEED_FUNCTION | ||
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| /* | ||
| * Properly seeds a `ecdaa_prng`. | ||
| * | ||
| * MUST be called on a `ecdaa_prng` before first use. | ||
| * | ||
| * No dynamic memory allocation is performed. | ||
| * | ||
| * Uses Libsodium's `randombytes_buf` as the source of | ||
| * a cryptographically-strong random seed. | ||
| * Requires the CMake option `DISABLE_LIBSODIUM_RNG_SEED_FUNCTION=OFF`. | ||
| * | ||
| * Returns: | ||
| * 0 on success | ||
| * -1 if unable to obtain seed | ||
| * -2 if entropy is insufficient | ||
| */ | ||
| int ecdaa_prng_init(struct ecdaa_prng *prng_in); | ||
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| #endif // DISABLE_LIBSODIUM_RNG_SEED_FUNCTION | ||
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| /* | ||
| * Properly seed a `ecdaa_prng`, with a custom cryptographically-strong random seed. | ||
| * | ||
| * MUST be called on a `ecdaa_prng` before first use, | ||
| * unless using `ecdaa_prng_init` instead. | ||
| * | ||
| * No dynamic memory allocation is performed. | ||
| * | ||
| * `seed_size` MUST be at least AMCL_SEED_SIZE. | ||
| * | ||
| * Returns: | ||
| * 0 on success | ||
| * -1 if seed_size < AMCL_SEED_SIZE | ||
| */ | ||
| int ecdaa_prng_init_custom(struct ecdaa_prng *prng_in, char *seed, size_t seed_size); | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif | ||
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