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Implement sign and verify in crypto.

This commit is contained in:
Fabio Alessandrelli 2020-06-06 15:42:46 +02:00
parent 788f18086e
commit dfcc11fa52
4 changed files with 54 additions and 0 deletions
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2
core/crypto/crypto.cpp
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@ -86,6 +86,8 @@ void Crypto::_bind_methods() {
ClassDB::bind_method(D_METHOD("generate_random_bytes", "size"), &Crypto::generate_random_bytes);
ClassDB::bind_method(D_METHOD("generate_rsa", "size"), &Crypto::generate_rsa);
ClassDB::bind_method(D_METHOD("generate_self_signed_certificate", "key", "issuer_name", "not_before", "not_after"), &Crypto::generate_self_signed_certificate, DEFVAL("CN=myserver,O=myorganisation,C=IT"), DEFVAL("20140101000000"), DEFVAL("20340101000000"));
ClassDB::bind_method(D_METHOD("sign", "hash_type", "hash", "key"), &Crypto::sign);
ClassDB::bind_method(D_METHOD("verify", "hash_type", "hash", "signature", "key"), &Crypto::verify);
}
/// Resource loader/saver

4
core/crypto/crypto.h
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@ -31,6 +31,7 @@
#ifndef CRYPTO_H
#define CRYPTO_H
#include "core/crypto/hashing_context.h"
#include "core/io/resource_loader.h"
#include "core/io/resource_saver.h"
#include "core/reference.h"
@ -82,6 +83,9 @@ public:
virtual Ref<CryptoKey> generate_rsa(int p_bytes) = 0;
virtual Ref<X509Certificate> generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after) = 0;
virtual Vector<uint8_t> sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key) = 0;
virtual bool verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key) = 0;
Crypto() {}
};

45
modules/mbedtls/crypto_mbedtls.cpp
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@ -317,3 +317,48 @@ PackedByteArray CryptoMbedTLS::generate_random_bytes(int p_bytes) {
mbedtls_ctr_drbg_random(&ctr_drbg, out.ptrw(), p_bytes);
return out;
}
mbedtls_md_type_t CryptoMbedTLS::_md_type_from_hashtype(HashingContext::HashType p_hash_type, int &r_size) {
switch (p_hash_type) {
case HashingContext::HASH_MD5:
r_size = 16;
return MBEDTLS_MD_MD5;
case HashingContext::HASH_SHA1:
r_size = 20;
return MBEDTLS_MD_SHA1;
case HashingContext::HASH_SHA256:
r_size = 32;
return MBEDTLS_MD_SHA256;
default:
r_size = 0;
ERR_FAIL_V_MSG(MBEDTLS_MD_NONE, "Invalid hash type.");
}
}
Vector<uint8_t> CryptoMbedTLS::sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key) {
int size;
mbedtls_md_type_t type = _md_type_from_hashtype(p_hash_type, size);
ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, Vector<uint8_t>(), "Invalid hash type.");
ERR_FAIL_COND_V_MSG(p_hash.size() != size, Vector<uint8_t>(), "Invalid hash provided. Size must be " + itos(size));
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
ERR_FAIL_COND_V_MSG(key->is_public_only(), Vector<uint8_t>(), "Invalid key provided. Cannot sign with public_only keys.");
size_t sig_size = 0;
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
Vector<uint8_t> out;
int ret = mbedtls_pk_sign(&(key->pkey), type, p_hash.ptr(), size, buf, &sig_size, mbedtls_ctr_drbg_random, &ctr_drbg);
ERR_FAIL_COND_V_MSG(ret, out, "Error while signing: " + itos(ret));
out.resize(sig_size);
copymem(out.ptrw(), buf, sig_size);
return out;
}
bool CryptoMbedTLS::verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key) {
int size;
mbedtls_md_type_t type = _md_type_from_hashtype(p_hash_type, size);
ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, false, "Invalid hash type.");
ERR_FAIL_COND_V_MSG(p_hash.size() != size, false, "Invalid hash provided. Size must be " + itos(size));
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), false, "Invalid key provided.");
return mbedtls_pk_verify(&(key->pkey), type, p_hash.ptr(), size, p_signature.ptr(), p_signature.size()) == 0;
}

3
modules/mbedtls/crypto_mbedtls.h
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@ -106,6 +106,7 @@ private:
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
static X509CertificateMbedTLS *default_certs;
mbedtls_md_type_t _md_type_from_hashtype(HashingContext::HashType p_hash_type, int &r_size);
public:
static Crypto *create();
@ -117,6 +118,8 @@ public:
virtual PackedByteArray generate_random_bytes(int p_bytes);
virtual Ref<CryptoKey> generate_rsa(int p_bytes);
virtual Ref<X509Certificate> generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after);
virtual Vector<uint8_t> sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key);
virtual bool verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key);
CryptoMbedTLS();
~CryptoMbedTLS();