File 0111-Use-EVP-for-AES-GCM.patch of Package erlang
From 004456821045f0bc158db402fecdb637ccde80ca Mon Sep 17 00:00:00 2001
From: Yuki Ito <yuki@gnnk.net>
Date: Fri, 23 Oct 2015 19:07:29 +0900
Subject: [PATCH 1/3] Use EVP for AES-GCM
This enables the use of hardware acceleration on newer Intel CPUs (AES-NI).
---
lib/crypto/c_src/crypto.c | 98 +++++++++++++++++++++++++++++++----------------
1 file changed, 64 insertions(+), 34 deletions(-)
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index bb27711..b968416 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -1620,44 +1620,62 @@ static ERL_NIF_TERM aes_ctr_stream_encrypt(ErlNifEnv* env, int argc, const ERL_N
static ERL_NIF_TERM aes_gcm_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key,Iv,AAD,In) */
#if defined(HAVE_GCM)
- GCM128_CONTEXT *ctx = NULL;
+ EVP_CIPHER_CTX *ctx;
+ const EVP_CIPHER *cipher = NULL;
ErlNifBinary key, iv, aad, in;
- AES_KEY aes_key;
- unsigned char *outp;
+ unsigned char *outp, *tagp;
ERL_NIF_TERM out, out_tag;
+ int len;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key)
- || AES_set_encrypt_key(key.data, key.size*8, &aes_key) != 0
+ || (key.size != 16 && key.size != 24 && key.size != 32)
|| !enif_inspect_binary(env, argv[1], &iv) || iv.size == 0
|| !enif_inspect_iolist_as_binary(env, argv[2], &aad)
|| !enif_inspect_iolist_as_binary(env, argv[3], &in)) {
return enif_make_badarg(env);
}
- if (!(ctx = CRYPTO_gcm128_new(&aes_key, (block128_f)AES_encrypt)))
- return atom_error;
+ if (key.size == 16)
+ cipher = EVP_aes_128_gcm();
+ else if (key.size == 24)
+ cipher = EVP_aes_192_gcm();
+ else if (key.size == 32)
+ cipher = EVP_aes_256_gcm();
- CRYPTO_gcm128_setiv(ctx, iv.data, iv.size);
+ if (!(ctx = EVP_CIPHER_CTX_new()))
+ return atom_error;
+ if (EVP_EncryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1)
+ goto out_err;
- if (CRYPTO_gcm128_aad(ctx, aad.data, aad.size))
- goto out_err;
+ EVP_CIPHER_CTX_set_padding(ctx, 0);
+
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, iv.size, NULL) != 1)
+ goto out_err;
+ if (EVP_EncryptInit_ex(ctx, NULL, NULL, key.data, iv.data) != 1)
+ goto out_err;
+ if (EVP_EncryptUpdate(ctx, NULL, &len, aad.data, aad.size) != 1)
+ goto out_err;
outp = enif_make_new_binary(env, in.size, &out);
- /* encrypt */
- if (CRYPTO_gcm128_encrypt(ctx, in.data, outp, in.size))
- goto out_err;
+ if (EVP_EncryptUpdate(ctx, outp, &len, in.data, in.size) != 1)
+ goto out_err;
+ if (EVP_EncryptFinal_ex(ctx, outp+len, &len) != 1)
+ goto out_err;
+
+ tagp = enif_make_new_binary(env, EVP_GCM_TLS_TAG_LEN, &out_tag);
- /* calculate the tag */
- CRYPTO_gcm128_tag(ctx, enif_make_new_binary(env, EVP_GCM_TLS_TAG_LEN, &out_tag), EVP_GCM_TLS_TAG_LEN);
- CRYPTO_gcm128_release(ctx);
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, EVP_GCM_TLS_TAG_LEN, tagp) != 1)
+ goto out_err;
+
+ EVP_CIPHER_CTX_free(ctx);
CONSUME_REDS(env, in);
return enif_make_tuple2(env, out, out_tag);
out_err:
- CRYPTO_gcm128_release(ctx);
+ EVP_CIPHER_CTX_free(ctx);
return atom_error;
#else
@@ -1668,14 +1686,15 @@ out_err:
static ERL_NIF_TERM aes_gcm_decrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Key,Iv,AAD,In,Tag) */
#if defined(HAVE_GCM)
- GCM128_CONTEXT *ctx;
+ EVP_CIPHER_CTX *ctx;
+ const EVP_CIPHER *cipher = NULL;
ErlNifBinary key, iv, aad, in, tag;
- AES_KEY aes_key;
unsigned char *outp;
ERL_NIF_TERM out;
+ int len;
if (!enif_inspect_iolist_as_binary(env, argv[0], &key)
- || AES_set_encrypt_key(key.data, key.size*8, &aes_key) != 0
+ || (key.size != 16 && key.size != 24 && key.size != 32)
|| !enif_inspect_binary(env, argv[1], &iv) || iv.size == 0
|| !enif_inspect_iolist_as_binary(env, argv[2], &aad)
|| !enif_inspect_iolist_as_binary(env, argv[3], &in)
@@ -1683,32 +1702,43 @@ static ERL_NIF_TERM aes_gcm_decrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM
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;
+ if (key.size == 16)
+ cipher = EVP_aes_128_gcm();
+ else if (key.size == 24)
+ cipher = EVP_aes_192_gcm();
+ else if (key.size == 32)
+ cipher = EVP_aes_256_gcm();
+
+ if (!(ctx = EVP_CIPHER_CTX_new()))
+ return atom_error;
+ if (EVP_DecryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1)
+ goto out_err;
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, iv.size, NULL) != 1)
+ goto out_err;
+ if (EVP_DecryptInit_ex(ctx, NULL, NULL, key.data, iv.data) != 1)
+ goto out_err;
+ if (EVP_DecryptUpdate(ctx, NULL, &len, aad.data, aad.size) != 1)
+ 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;
+ if (EVP_DecryptUpdate(ctx, outp, &len, in.data, in.size) != 1)
+ goto out_err;
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, EVP_GCM_TLS_TAG_LEN, tag.data) != 1)
+ goto out_err;
+ if (EVP_DecryptFinal_ex(ctx, outp+len, &len) != 1)
+ goto out_err;
- /* calculate and check the tag */
- if (CRYPTO_gcm128_finish(ctx, tag.data, EVP_GCM_TLS_TAG_LEN))
- goto out_err;
+ EVP_CIPHER_CTX_free(ctx);
- CRYPTO_gcm128_release(ctx);
CONSUME_REDS(env, in);
return out;
out_err:
- CRYPTO_gcm128_release(ctx);
+ EVP_CIPHER_CTX_free(ctx);
return atom_error;
+
#else
return enif_raise_exception(env, atom_notsup);
#endif
--
2.1.4
