crypto
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quasis
Small, fast, header only, zero dependency cryptographic library.
Crypto
Small, fast, header only, zero dependency cryptographic library written in C++2a.
Cryptographic hash functions
Cryptographic Hash Functions (CHFs) are a family of algorithms that take an input (or message) and produce a fixed-size output, known as the hash value or digest. This process is a one-way function, meaning it is computationally infeasible to reverse the hash value to obtain the original input. Additionally, small changes in the input will result in significantly different hash values.
Algorithms
| Class | Word bits | Size bits | Block bits | Rounds | State bits | Output bits |
|---|---|---|---|---|---|---|
| MD4 | 32 | 64 | 512 | 3 | 128 | 128 |
| MD5 | 32 | 64 | 512 | 64 | 128 | 128 |
| RMD<128> | 32 | 64 | 512 | 64 | 128 | 128 |
| RMD<160> | 32 | 64 | 512 | 80 | 160 | 160 |
| RMD<256> | 32 | 64 | 512 | 64 | 256 | 256 |
| RMD<320> | 32 | 64 | 512 | 80 | 320 | 320 |
| SHA1 | 32 | 64 | 512 | 80 | 160 | 160 |
| SHA2<256,224> | 32 | 64 | 512 | 64 | 256 | 224 |
| SHA2<256,256> | 32 | 64 | 512 | 64 | 256 | 256 |
| SHA2<512,224> | 64 | 128 | 1024 | 80 | 512 | 224 |
| SHA2<512,256> | 64 | 128 | 1024 | 80 | 512 | 256 |
| SHA2<512,384> | 64 | 128 | 1024 | 80 | 512 | 384 |
| SHA2<512,512> | 64 | 128 | 1024 | 80 | 512 | 512 |
Examples
Double hashing the contents of a container holding trivially copyable objects with the help of SHA2<256> and RMD<160>. Note that rmd<160>(message) is an alias for RMD<160>().update(message).digest().
#include <crypto/rmd.h>
#include <crypto/sha2.h>
using namespace crypto;
auto
hash(const auto &trivially_copyable_objects) {
auto hasher = SHA2<256>();
for (const auto &entry: trivially_copyable_objects) {
hasher.update(entry);
}
return rmd<160>(hasher.update("secret").digest());
}
Message authentication codes
Message Authentication Codes (MACs) are cryptographic mechanisms used to ensure the integrity and authenticity of a message or data transmission. They provide a way to verify that a message has not been tampered with during transmission and that it originates from a trusted source.
Algorithms
Only the hash-based message authentication code (HMAC) is supported at the moment.
Examples
Double hashing the contents of a container holding trivially copyable objects with the help of HMAC, SHA2<256> and RMD<160>. Note that hmac<RMD<160>>(secret, message) is an alias for HMAC<RMD<160>>(secret).update(message).digest().
#include <crypto/rmd.h>
#include <crypto/sha2.h>
#include <crypto/hmac.h>
using namespace crypto;
auto
hash(const auto &trivially_copyable_objects) {
auto hasher = HMAC<SHA2<256>>("secret 1");
for (const auto &entry: trivially_copyable_objects) {
hasher.update(entry);
}
return hmac<RMD<160>>("secret 2", hasher.digest());
}
Installation
Download the sources to the folder of choice and include the desired headers.
Contributing
Feature requests, bug reports and success stories are most welcome.
Copyright
Copyright 2018 Quasis - The MIT License
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