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authorJakob Unterwurzacher2021-09-03 17:11:57 +0200
committerJakob Unterwurzacher2021-09-07 18:14:05 +0200
commit69d626b26f5a3f55c752b59af44710b992e2ab76 (patch)
tree030d8b65aedb4a6d8e40c3f9c3552775a38d0669 /internal
parenta3f5a8492a8bc62d8e2a639bd449b425efa66ce2 (diff)
stupidgcm: replace chacha20poly1305_seal with generic aead_seal
Diffstat (limited to 'internal')
-rw-r--r--internal/stupidgcm/Makefile2
-rw-r--r--internal/stupidgcm/chacha.c20
-rw-r--r--internal/stupidgcm/chacha.h17
-rw-r--r--internal/stupidgcm/stupidchacha.go9
4 files changed, 37 insertions, 11 deletions
diff --git a/internal/stupidgcm/Makefile b/internal/stupidgcm/Makefile
index 19f9914..22e3b2e 100644
--- a/internal/stupidgcm/Makefile
+++ b/internal/stupidgcm/Makefile
@@ -4,4 +4,4 @@ gcc:
.PHONY: format
format:
- clang-format --style=WebKit -i *.c
+ clang-format --style=WebKit -i *.c *.h
diff --git a/internal/stupidgcm/chacha.c b/internal/stupidgcm/chacha.c
index c85cf78..e188bfc 100644
--- a/internal/stupidgcm/chacha.c
+++ b/internal/stupidgcm/chacha.c
@@ -1,9 +1,8 @@
+#include "chacha.h"
#include <openssl/evp.h>
#include <stdio.h>
//#cgo pkg-config: libcrypto
-extern void panic1(void);
-
static void panic(const char* const msg)
{
fprintf(stderr, "panic in C code: %s\n", msg);
@@ -11,7 +10,8 @@ static void panic(const char* const msg)
}
// https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption#Authenticated_Encryption_using_GCM_mode
-int chacha20poly1305_seal(
+int aead_seal(
+ const enum aeadType cipherId,
const unsigned char* const plaintext,
const int plaintextLen,
const unsigned char* const authData,
@@ -23,6 +23,18 @@ int chacha20poly1305_seal(
unsigned char* const ciphertext,
const int ciphertextBufLen)
{
+ const EVP_CIPHER* evpCipher = NULL;
+ switch (cipherId) {
+ case aeadTypeChacha:
+ evpCipher = EVP_chacha20_poly1305();
+ break;
+ case aeadTypeGcm:
+ evpCipher = EVP_aes_256_gcm();
+ break;
+ default:
+ panic("unknown cipherId");
+ }
+
// Create scratch space "context"
EVP_CIPHER_CTX* ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
@@ -30,7 +42,7 @@ int chacha20poly1305_seal(
}
// Set cipher
- if (EVP_EncryptInit_ex(ctx, EVP_chacha20_poly1305(), NULL, NULL, NULL) != 1) {
+ if (EVP_EncryptInit_ex(ctx, evpCipher, NULL, NULL, NULL) != 1) {
panic("EVP_EncryptInit_ex set cipher failed");
}
diff --git a/internal/stupidgcm/chacha.h b/internal/stupidgcm/chacha.h
new file mode 100644
index 0000000..780350a
--- /dev/null
+++ b/internal/stupidgcm/chacha.h
@@ -0,0 +1,17 @@
+enum aeadType {
+ aeadTypeChacha = 1,
+ aeadTypeGcm = 2,
+};
+
+int aead_seal(
+ const enum aeadType cipherId,
+ const unsigned char* const plaintext,
+ const int plaintextLen,
+ const unsigned char* const authData,
+ const int authDataLen,
+ const unsigned char* const key,
+ const int keyLen,
+ const unsigned char* const iv,
+ const int ivLen,
+ unsigned char* const ciphertext,
+ const int ciphertextBufLen);
diff --git a/internal/stupidgcm/stupidchacha.go b/internal/stupidgcm/stupidchacha.go
index 1f16a5e..18037c6 100644
--- a/internal/stupidgcm/stupidchacha.go
+++ b/internal/stupidgcm/stupidchacha.go
@@ -13,12 +13,8 @@ import (
/*
#include <openssl/evp.h>
+#include "chacha.h"
#cgo pkg-config: libcrypto
-int chacha20poly1305_seal(const unsigned char * const plaintext, const int plaintextLen,
- const unsigned char * const authData, const int authDataLen,
- const unsigned char * const key, const int keyLen,
- const unsigned char * const iv, const int ivLen,
- unsigned char * const ciphertext, const int ciphertextBufLen);
*/
import "C"
@@ -75,7 +71,8 @@ func (g *stupidChacha20poly1305) Seal(dst, iv, in, authData []byte) []byte {
buf = make([]byte, outLen)
}
- C.chacha20poly1305_seal((*C.uchar)(&in[0]),
+ C.aead_seal(C.aeadTypeChacha,
+ (*C.uchar)(&in[0]),
C.int(len(in)),
(*C.uchar)(&authData[0]),
C.int(len(authData)),