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#include "aes.h"
#include "cipher.h"
ERL_NIF_TERM aes_cfb_8_crypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IVec, Data, IsEncrypt) */
ErlNifBinary key, ivec, text;
AES_KEY aes_key;
unsigned char ivec_clone[16]; /* writable copy */
int new_ivlen = 0;
ERL_NIF_TERM ret;
CHECK_NO_FIPS_MODE();
if (!enif_inspect_iolist_as_binary(env, argv[0], &key)
|| !(key.size == 16 || key.size == 24 || key.size == 32)
|| !enif_inspect_binary(env, argv[1], &ivec) || ivec.size != 16
|| !enif_inspect_iolist_as_binary(env, argv[2], &text)) {
return enif_make_badarg(env);
}
memcpy(ivec_clone, ivec.data, 16);
AES_set_encrypt_key(key.data, key.size * 8, &aes_key);
AES_cfb8_encrypt((unsigned char *) text.data,
enif_make_new_binary(env, text.size, &ret),
text.size, &aes_key, ivec_clone, &new_ivlen,
(argv[3] == atom_true));
CONSUME_REDS(env,text);
return ret;
}
ERL_NIF_TERM aes_cfb_128_crypt_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IVec, Data, IsEncrypt) */
ErlNifBinary key, ivec, text;
AES_KEY aes_key;
unsigned char ivec_clone[16]; /* writable copy */
int new_ivlen = 0;
ERL_NIF_TERM ret;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key)
|| !(key.size == 16 || key.size == 24 || key.size == 32)
|| !enif_inspect_binary(env, argv[1], &ivec) || ivec.size != 16
|| !enif_inspect_iolist_as_binary(env, argv[2], &text)) {
return enif_make_badarg(env);
}
memcpy(ivec_clone, ivec.data, 16);
AES_set_encrypt_key(key.data, key.size * 8, &aes_key);
AES_cfb128_encrypt((unsigned char *) text.data,
enif_make_new_binary(env, text.size, &ret),
text.size, &aes_key, ivec_clone, &new_ivlen,
(argv[3] == atom_true));
CONSUME_REDS(env,text);
return ret;
}
ERL_NIF_TERM aes_ige_crypt_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IVec, Data, IsEncrypt) */
#ifdef HAVE_AES_IGE
ErlNifBinary key_bin, ivec_bin, data_bin;
AES_KEY aes_key;
unsigned char ivec[32];
int i;
unsigned char* ret_ptr;
ERL_NIF_TERM ret;
CHECK_NO_FIPS_MODE();
if (!enif_inspect_iolist_as_binary(env, argv[0], &key_bin)
|| (key_bin.size != 16 && key_bin.size != 32)
|| !enif_inspect_binary(env, argv[1], &ivec_bin)
|| ivec_bin.size != 32
|| !enif_inspect_iolist_as_binary(env, argv[2], &data_bin)
|| data_bin.size % 16 != 0) {
return enif_make_badarg(env);
}
if (argv[3] == atom_true) {
i = AES_ENCRYPT;
AES_set_encrypt_key(key_bin.data, key_bin.size*8, &aes_key);
}
else {
i = AES_DECRYPT;
AES_set_decrypt_key(key_bin.data, key_bin.size*8, &aes_key);
}
ret_ptr = enif_make_new_binary(env, data_bin.size, &ret);
memcpy(ivec, ivec_bin.data, 32); /* writable copy */
AES_ige_encrypt(data_bin.data, ret_ptr, data_bin.size, &aes_key, ivec, i);
CONSUME_REDS(env,data_bin);
return ret;
#else
return atom_notsup;
#endif
}
/* Initializes state for ctr streaming (de)encryption
*/
#ifdef HAVE_EVP_AES_CTR
ERL_NIF_TERM aes_ctr_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IVec) */
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)
|| ivec_bin.size != 16) {
return enif_make_badarg(env);
}
switch (key_bin.size)
{
case 16: cipher = EVP_aes_128_ctr(); break;
case 24: cipher = EVP_aes_192_ctr(); break;
case 32: cipher = EVP_aes_256_ctr(); break;
default: return enif_make_badarg(env);
}
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;
}
ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Context, Data) */
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 /* if not HAVE_EVP_AES_CTR */
ERL_NIF_TERM aes_ctr_stream_init(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key, IVec) */
ErlNifBinary key_bin, ivec_bin;
ERL_NIF_TERM ecount_bin;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key_bin)
|| !enif_inspect_binary(env, argv[1], &ivec_bin)
|| !(key_bin.size == 16 || key_bin.size == 24 || key_bin.size ==32)
|| ivec_bin.size != 16) {
return enif_make_badarg(env);
}
memset(enif_make_new_binary(env, AES_BLOCK_SIZE, &ecount_bin),
0, AES_BLOCK_SIZE);
return enif_make_tuple4(env, argv[0], argv[1], ecount_bin, enif_make_int(env, 0));
}
ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* ({Key, IVec, ECount, Num}, Data) */
ErlNifBinary key_bin, ivec_bin, text_bin, ecount_bin;
AES_KEY aes_key;
unsigned int num;
ERL_NIF_TERM ret, num2_term, cipher_term, ivec2_term, ecount2_term, new_state_term;
int state_arity;
const ERL_NIF_TERM *state_term;
unsigned char * ivec2_buf;
unsigned char * ecount2_buf;
if (!enif_get_tuple(env, argv[0], &state_arity, &state_term)
|| state_arity != 4
|| !enif_inspect_iolist_as_binary(env, state_term[0], &key_bin)
|| AES_set_encrypt_key(key_bin.data, key_bin.size*8, &aes_key) != 0
|| !enif_inspect_binary(env, state_term[1], &ivec_bin) || ivec_bin.size != 16
|| !enif_inspect_binary(env, state_term[2], &ecount_bin) || ecount_bin.size != AES_BLOCK_SIZE
|| !enif_get_uint(env, state_term[3], &num)
|| !enif_inspect_iolist_as_binary(env, argv[1], &text_bin)) {
return enif_make_badarg(env);
}
ivec2_buf = enif_make_new_binary(env, ivec_bin.size, &ivec2_term);
ecount2_buf = enif_make_new_binary(env, ecount_bin.size, &ecount2_term);
memcpy(ivec2_buf, ivec_bin.data, 16);
memcpy(ecount2_buf, ecount_bin.data, ecount_bin.size);
AES_ctr128_encrypt((unsigned char *) text_bin.data,
enif_make_new_binary(env, text_bin.size, &cipher_term),
text_bin.size, &aes_key, ivec2_buf, ecount2_buf, &num);
num2_term = enif_make_uint(env, num);
new_state_term = enif_make_tuple4(env, state_term[0], ivec2_term, ecount2_term, num2_term);
ret = enif_make_tuple2(env, new_state_term, cipher_term);
CONSUME_REDS(env,text_bin);
return ret;
}
#endif /* !HAVE_EVP_AES_CTR */
#ifdef HAVE_GCM_EVP_DECRYPT_BUG
ERL_NIF_TERM aes_gcm_decrypt_NO_EVP(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type,Key,Iv,AAD,In,Tag) */
GCM128_CONTEXT *ctx;
ErlNifBinary key, iv, aad, in, tag;
AES_KEY aes_key;
unsigned char *outp;
ERL_NIF_TERM out;
if (!enif_inspect_iolist_as_binary(env, argv[1], &key)
|| AES_set_encrypt_key(key.data, key.size*8, &aes_key) != 0
|| !enif_inspect_binary(env, argv[2], &iv) || iv.size == 0
|| !enif_inspect_iolist_as_binary(env, argv[3], &aad)
|| !enif_inspect_iolist_as_binary(env, argv[4], &in)
|| !enif_inspect_iolist_as_binary(env, argv[5], &tag)) {
return enif_make_badarg(env);
}
if (!(ctx = CRYPTO_gcm128_new(&aes_key, (block128_f)AES_encrypt)))
return atom_error;
CRYPTO_gcm128_setiv(ctx, iv.data, iv.size);
if (CRYPTO_gcm128_aad(ctx, aad.data, aad.size))
goto out_err;
outp = enif_make_new_binary(env, in.size, &out);
/* decrypt */
if (CRYPTO_gcm128_decrypt(ctx, in.data, outp, in.size))
goto out_err;
/* calculate and check the tag */
if (CRYPTO_gcm128_finish(ctx, tag.data, tag.size))
goto out_err;
CRYPTO_gcm128_release(ctx);
CONSUME_REDS(env, in);
return out;
out_err:
CRYPTO_gcm128_release(ctx);
return atom_error;
}
#endif /* HAVE_GCM_EVP_DECRYPT_BUG */
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