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authorDoug Hogan <[email protected]>2019-01-04 00:14:19 -0800
committerDoug Hogan <[email protected]>2019-01-08 01:11:58 -0800
commit202b22f5af173029f4c66a7e77026f0d3f8e8766 (patch)
treee2dbf3ad37c84030ae95be922324e84dea7d7c36 /lib/crypto/c_src
parent80627dc43b81951bb62f9bd66c03275e5939239a (diff)
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Revamp aes_gcm_decrypt_NO_EVP()
* Add casts where appropriate and use bounds checking. * Mention where OpenSSL APIs use 0 for success.
Diffstat (limited to 'lib/crypto/c_src')
-rw-r--r--lib/crypto/c_src/aes.c74
1 files changed, 48 insertions, 26 deletions
diff --git a/lib/crypto/c_src/aes.c b/lib/crypto/c_src/aes.c
index 665467bc2c..94b874298e 100644
--- a/lib/crypto/c_src/aes.c
+++ b/lib/crypto/c_src/aes.c
@@ -374,47 +374,69 @@ ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM
#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;
+ GCM128_CONTEXT *ctx = NULL;
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);
- }
+ ERL_NIF_TERM out, ret;
- if (!(ctx = CRYPTO_gcm128_new(&aes_key, (block128_f)AES_encrypt)))
- return atom_error;
+ if (argc != 6)
+ goto bad_arg;
+ if (!enif_inspect_iolist_as_binary(env, argv[1], &key))
+ goto bad_arg;
+ if (key.size > INT_MAX / 8)
+ goto bad_arg;
+ if (!enif_inspect_binary(env, argv[2], &iv))
+ goto bad_arg;
+ if (iv.size == 0)
+ goto bad_arg;
+ if (!enif_inspect_iolist_as_binary(env, argv[3], &aad))
+ goto bad_arg;
+ if (!enif_inspect_iolist_as_binary(env, argv[4], &in))
+ goto bad_arg;
+ if (!enif_inspect_iolist_as_binary(env, argv[5], &tag))
+ goto bad_arg;
+
+ /* NOTE: This function returns 0 on success unlike most OpenSSL functions */
+ if (AES_set_encrypt_key(key.data, (int)key.size * 8, &aes_key) != 0)
+ goto bad_arg;
+
+ if ((ctx = CRYPTO_gcm128_new(&aes_key, (block128_f)AES_encrypt)) == NULL)
+ goto err;
CRYPTO_gcm128_setiv(ctx, iv.data, iv.size);
- if (CRYPTO_gcm128_aad(ctx, aad.data, aad.size))
- goto out_err;
+ /* NOTE: This function returns 0 on success unlike most OpenSSL functions */
+ if (CRYPTO_gcm128_aad(ctx, aad.data, aad.size) != 0)
+ goto err;
- outp = enif_make_new_binary(env, in.size, &out);
+ if ((outp = enif_make_new_binary(env, in.size, &out)) == NULL)
+ goto err;
- /* decrypt */
- if (CRYPTO_gcm128_decrypt(ctx, in.data, outp, in.size))
- goto out_err;
+ /* NOTE: This function returns 0 on success unlike most OpenSSL functions */
+ if (CRYPTO_gcm128_decrypt(ctx, in.data, outp, in.size) != 0)
+ goto err;
/* calculate and check the tag */
- if (CRYPTO_gcm128_finish(ctx, tag.data, tag.size))
- goto out_err;
+ /* NOTE: This function returns 0 on success unlike most OpenSSL functions */
+ if (CRYPTO_gcm128_finish(ctx, tag.data, tag.size) != 0)
+ goto err;
- CRYPTO_gcm128_release(ctx);
CONSUME_REDS(env, in);
+ ret = out;
+ goto done;
- return out;
+ bad_arg:
+ ret = enif_make_badarg(env);
+ goto done;
-out_err:
- CRYPTO_gcm128_release(ctx);
- return atom_error;
+ err:
+ ret = atom_error;
+
+ done:
+ if (ctx)
+ CRYPTO_gcm128_release(ctx);
+ return ret;
}
#endif /* HAVE_GCM_EVP_DECRYPT_BUG */