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crypto.cc: API cleanup and add generate() / to_string() methods

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This commit is contained in:
Eelco Dolstra 2021-01-06 17:04:46 +01:00
parent 146af4ee9b
commit 555152ffe8
3 changed files with 45 additions and 29 deletions
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33
src/libstore/crypto.cc
View file

@ -8,15 +8,15 @@
namespace nix {
static std::pair<std::string, std::string> split(const string & s)
static std::pair<std::string_view, std::string_view> split(std::string_view s)
{
size_t colon = s.find(':');
if (colon == std::string::npos || colon == 0)
return {"", ""};
return {std::string(s, 0, colon), std::string(s, colon + 1)};
return {s.substr(0, colon), s.substr(colon + 1)};
}
Key::Key(const string & s)
Key::Key(std::string_view s)
{
auto ss = split(s);
@ -29,7 +29,12 @@ Key::Key(const string & s)
key = base64Decode(key);
}
SecretKey::SecretKey(const string & s)
std::string Key::to_string() const
{
return name + ":" + base64Encode(key);
}
SecretKey::SecretKey(std::string_view s)
: Key(s)
{
#if HAVE_SODIUM
@ -45,7 +50,7 @@ SecretKey::SecretKey(const string & s)
}
#endif
std::string SecretKey::signDetached(const std::string & data) const
std::string SecretKey::signDetached(std::string_view data) const
{
#if HAVE_SODIUM
unsigned char sig[crypto_sign_BYTES];
@ -69,7 +74,21 @@ PublicKey SecretKey::toPublicKey() const
#endif
}
PublicKey::PublicKey(const string & s)
SecretKey SecretKey::generate(std::string_view name)
{
#if HAVE_SODIUM
unsigned char pk[crypto_sign_PUBLICKEYBYTES];
unsigned char sk[crypto_sign_SECRETKEYBYTES];
if (crypto_sign_keypair(pk, sk) != 0)
throw Error("key generation failed");
return SecretKey(name, std::string((char *) sk, crypto_sign_SECRETKEYBYTES));
#else
noSodium();
#endif
}
PublicKey::PublicKey(std::string_view s)
: Key(s)
{
#if HAVE_SODIUM
@ -84,7 +103,7 @@ bool verifyDetached(const std::string & data, const std::string & sig,
#if HAVE_SODIUM
auto ss = split(sig);
auto key = publicKeys.find(ss.first);
auto key = publicKeys.find(std::string(ss.first));
if (key == publicKeys.end()) return false;
auto sig2 = base64Decode(ss.second);

24
src/libstore/crypto.hh
View file

@ -13,32 +13,40 @@ struct Key
/* Construct Key from a string in the format
‘<name>:<key-in-base64>’. */
Key(const std::string & s);
Key(std::string_view s);
std::string to_string() const;
protected:
Key(const std::string & name, const std::string & key)
: name(name), key(key) { }
Key(std::string_view name, std::string && key)
: name(name), key(std::move(key)) { }
};
struct PublicKey;
struct SecretKey : Key
{
SecretKey(const std::string & s);
SecretKey(std::string_view s);
/* Return a detached signature of the given string. */
std::string signDetached(const std::string & s) const;
std::string signDetached(std::string_view s) const;
PublicKey toPublicKey() const;
static SecretKey generate(std::string_view name);
private:
SecretKey(std::string_view name, std::string && key)
: Key(name, std::move(key)) { }
};
struct PublicKey : Key
{
PublicKey(const std::string & data);
PublicKey(std::string_view data);
private:
PublicKey(const std::string & name, const std::string & key)
: Key(name, key) { }
PublicKey(std::string_view name, std::string && key)
: Key(name, std::move(key)) { }
friend struct SecretKey;
};

17
src/nix-store/nix-store.cc
View file

@ -19,10 +19,6 @@
#include <sys/stat.h>
#include <fcntl.h>
#if HAVE_SODIUM
#include <sodium.h>
#endif
namespace nix_store {
@ -980,18 +976,11 @@ static void opGenerateBinaryCacheKey(Strings opFlags, Strings opArgs)
string secretKeyFile = *i++;
string publicKeyFile = *i++;
#if HAVE_SODIUM
unsigned char pk[crypto_sign_PUBLICKEYBYTES];
unsigned char sk[crypto_sign_SECRETKEYBYTES];
if (crypto_sign_keypair(pk, sk) != 0)
throw Error("key generation failed");
auto secretKey = SecretKey::generate(keyName);
writeFile(publicKeyFile, keyName + ":" + base64Encode(string((char *) pk, crypto_sign_PUBLICKEYBYTES)));
writeFile(publicKeyFile, secretKey.toPublicKey().to_string());
umask(0077);
writeFile(secretKeyFile, keyName + ":" + base64Encode(string((char *) sk, crypto_sign_SECRETKEYBYTES)));
#else
throw Error("Nix was not compiled with libsodium, required for signed binary cache support");
#endif
writeFile(secretKeyFile, secretKey.to_string());
}