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#include "chacha20.h"
#include "cipher.h"
ERL_NIF_TERM chacha20_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IV) */
#if defined(HAVE_CHACHA20)
ErlNifBinary key_bin, ivec_bin;
struct evp_cipher_ctx *ctx;
const EVP_CIPHER *cipher;
ERL_NIF_TERM ret;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key_bin)
|| !enif_inspect_binary(env, argv[1], &ivec_bin)
|| key_bin.size != 32
|| ivec_bin.size != 16) {
return enif_make_badarg(env);
}
cipher = EVP_chacha20();
ctx = enif_alloc_resource(evp_cipher_ctx_rtype, sizeof(struct evp_cipher_ctx));
ctx->ctx = EVP_CIPHER_CTX_new();
EVP_CipherInit_ex(ctx->ctx, cipher, NULL,
key_bin.data, ivec_bin.data, 1);
EVP_CIPHER_CTX_set_padding(ctx->ctx, 0);
ret = enif_make_resource(env, ctx);
enif_release_resource(ctx);
return ret;
#else
return enif_raise_exception(env, atom_notsup);
#endif
};
ERL_NIF_TERM chacha20_stream_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (State, Data) */
#if defined(HAVE_CHACHA20)
struct evp_cipher_ctx *ctx, *new_ctx;
ErlNifBinary data_bin;
ERL_NIF_TERM ret, cipher_term;
unsigned char *out;
int outl = 0;
if (!enif_get_resource(env, argv[0], evp_cipher_ctx_rtype, (void**)&ctx)
|| !enif_inspect_iolist_as_binary(env, argv[1], &data_bin)) {
return enif_make_badarg(env);
}
new_ctx = enif_alloc_resource(evp_cipher_ctx_rtype, sizeof(struct evp_cipher_ctx));
new_ctx->ctx = EVP_CIPHER_CTX_new();
EVP_CIPHER_CTX_copy(new_ctx->ctx, ctx->ctx);
out = enif_make_new_binary(env, data_bin.size, &cipher_term);
EVP_CipherUpdate(new_ctx->ctx, out, &outl, data_bin.data, data_bin.size);
ASSERT(outl == data_bin.size);
ret = enif_make_tuple2(env, enif_make_resource(env, new_ctx), cipher_term);
enif_release_resource(new_ctx);
CONSUME_REDS(env,data_bin);
return ret;
#else
return enif_raise_exception(env, atom_notsup);
#endif
};
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