Move AEAD functionality to a new file

1 files changed, 214 insertions, 0 deletions

diff --git a/lib/crypto/c_src/aead.c b/lib/crypto/c_src/aead.c
new file mode 100644
index 0000000000..9a990cfaf5
--- /dev/null
+++ b/lib/crypto/c_src/aead.c
@@ -0,0 +1,214 @@
+#include "aead.h"
+#include "aes.h"
+#include "chacha20.h"
+
+ERL_NIF_TERM aead_encrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Type,Key,Iv,AAD,In) */
+#if defined(HAVE_AEAD)
+    EVP_CIPHER_CTX *ctx;
+    const EVP_CIPHER *cipher = NULL;
+    ErlNifBinary key, iv, aad, in;
+    unsigned int tag_len;
+    unsigned char *outp, *tagp;
+    ERL_NIF_TERM type, out, out_tag;
+    int len, ctx_ctrl_set_ivlen, ctx_ctrl_get_tag;
+
+    type = argv[0];
+
+    if (!enif_is_atom(env, type)
+        || !enif_inspect_iolist_as_binary(env, argv[1], &key)
+	|| !enif_inspect_binary(env, argv[2], &iv)
+	|| !enif_inspect_iolist_as_binary(env, argv[3], &aad)
+	|| !enif_inspect_iolist_as_binary(env, argv[4], &in)
+	|| !enif_get_uint(env, argv[5], &tag_len)) {
+	return enif_make_badarg(env);
+    }
+
+    /* Use cipher_type some day.  Must check block_encrypt|decrypt first */
+#if defined(HAVE_GCM)
+    if (type == atom_aes_gcm) {
+        if ((iv.size > 0)
+            && (1 <= tag_len && tag_len <= 16)) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_GCM_SET_IVLEN;
+            ctx_ctrl_get_tag = EVP_CTRL_GCM_GET_TAG;
+            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();
+            else enif_make_badarg(env);
+        } else
+            enif_make_badarg(env);
+    } else
+#endif
+#if defined(HAVE_CCM)
+    if (type == atom_aes_ccm) {
+        if ((7 <= iv.size && iv.size <= 13)
+            && (4 <= tag_len && tag_len <= 16)
+            && ((tag_len & 1) == 0)
+            ) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_CCM_SET_IVLEN;
+            ctx_ctrl_get_tag = EVP_CTRL_CCM_GET_TAG;
+            if (key.size == 16)      cipher = EVP_aes_128_ccm();
+            else if (key.size == 24) cipher = EVP_aes_192_ccm();
+            else if (key.size == 32) cipher = EVP_aes_256_ccm();
+            else enif_make_badarg(env);
+        } else
+            enif_make_badarg(env);
+    } else
+#endif
+#if defined(HAVE_CHACHA20_POLY1305)
+    if (type == atom_chacha20_poly1305) {
+        if ((key.size == 32)
+            && (1 <= iv.size && iv.size <= 16)
+            && (tag_len == 16)
+            ) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_AEAD_SET_IVLEN;
+            ctx_ctrl_get_tag = EVP_CTRL_AEAD_GET_TAG,
+                cipher = EVP_chacha20_poly1305();
+        } else enif_make_badarg(env);
+    } else
+#endif
+        return enif_raise_exception(env, atom_notsup);
+ 
+    ctx = EVP_CIPHER_CTX_new();
+    if (EVP_EncryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) goto out_err;
+    if (EVP_CIPHER_CTX_ctrl(ctx, ctx_ctrl_set_ivlen, iv.size, NULL) != 1) goto out_err;
+
+#if defined(HAVE_CCM)
+    if (type == atom_aes_ccm) {
+        if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, tag_len, 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, NULL, in.size) != 1) goto out_err;
+    } else
+#endif
+        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);
+
+    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, tag_len, &out_tag);
+
+    if (EVP_CIPHER_CTX_ctrl(ctx, ctx_ctrl_get_tag, 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: 
+    EVP_CIPHER_CTX_free(ctx);
+    return atom_error;
+
+#else
+    return enif_raise_exception(env, atom_notsup);
+#endif
+}
+
+ERL_NIF_TERM aead_decrypt(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{/* (Type,Key,Iv,AAD,In,Tag) */
+#if defined(HAVE_AEAD)
+    EVP_CIPHER_CTX *ctx;
+    const EVP_CIPHER *cipher = NULL;
+    ErlNifBinary key, iv, aad, in, tag;
+    unsigned char *outp;
+    ERL_NIF_TERM type, out;
+    int len, ctx_ctrl_set_ivlen, ctx_ctrl_set_tag;
+
+    type = argv[0];
+#if defined(HAVE_GCM_EVP_DECRYPT_BUG)
+    if (type == atom_aes_gcm)
+        return aes_gcm_decrypt_NO_EVP(env, argc, argv);
+#endif
+
+    if (!enif_is_atom(env, type)
+        || !enif_inspect_iolist_as_binary(env, argv[1], &key)
+	|| !enif_inspect_binary(env, argv[2], &iv)
+	|| !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);
+    }
+
+    /* Use cipher_type some day.  Must check block_encrypt|decrypt first */
+#if defined(HAVE_GCM)
+    if (type == atom_aes_gcm) {
+        if (iv.size > 0) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_GCM_SET_IVLEN;
+            ctx_ctrl_set_tag = EVP_CTRL_GCM_SET_TAG;
+            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();
+            else enif_make_badarg(env);
+        } else
+            enif_make_badarg(env);
+    } else
+#endif
+#if defined(HAVE_CCM)
+    if (type == atom_aes_ccm) {
+        if (iv.size > 0) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_CCM_SET_IVLEN;
+            if (key.size == 16)      cipher = EVP_aes_128_ccm();
+            else if (key.size == 24) cipher = EVP_aes_192_ccm();
+            else if (key.size == 32) cipher = EVP_aes_256_ccm();
+            else enif_make_badarg(env);
+        } else
+            enif_make_badarg(env);
+    } else
+#endif
+#if defined(HAVE_CHACHA20_POLY1305)
+    if (type == atom_chacha20_poly1305) {
+        if ((key.size == 32)
+            && (1 <= iv.size && iv.size <= 16)
+            && tag.size == 16
+            ) {
+            ctx_ctrl_set_ivlen = EVP_CTRL_AEAD_SET_IVLEN;
+            ctx_ctrl_set_tag = EVP_CTRL_AEAD_SET_TAG;
+            cipher = EVP_chacha20_poly1305();
+        } else enif_make_badarg(env);
+    } else
+#endif
+        return enif_raise_exception(env, atom_notsup);
+
+    outp = enif_make_new_binary(env, in.size, &out);
+
+    ctx = EVP_CIPHER_CTX_new();
+    if (EVP_DecryptInit_ex(ctx, cipher, NULL, NULL, NULL) != 1) goto out_err;
+    if (EVP_CIPHER_CTX_ctrl(ctx,  ctx_ctrl_set_ivlen, iv.size, NULL) != 1) goto out_err;
+
+#if defined(HAVE_CCM)
+    if (type == atom_aes_ccm) {
+        if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, tag.size, tag.data) != 1) goto out_err;
+    }
+#endif
+
+    if (EVP_DecryptInit_ex(ctx, NULL, NULL, key.data, iv.data) != 1) goto out_err;
+
+#if defined(HAVE_CCM)
+    if (type == atom_aes_ccm) {
+        if (1 != EVP_DecryptUpdate(ctx, NULL, &len, NULL, in.size)) goto out_err;
+    }
+#endif
+
+    if (EVP_DecryptUpdate(ctx, NULL, &len, aad.data, aad.size) != 1) goto out_err;
+    if (EVP_DecryptUpdate(ctx, outp, &len, in.data, in.size) != 1) goto out_err;
+
+#if defined(HAVE_GCM) || defined(HAVE_CHACHA20_POLY1305)
+    if (type == atom_aes_gcm) {
+         if (EVP_CIPHER_CTX_ctrl(ctx, ctx_ctrl_set_tag, tag.size, tag.data) != 1) goto out_err;
+         if (EVP_DecryptFinal_ex(ctx, outp+len, &len) != 1) goto out_err;
+    }
+#endif
+    EVP_CIPHER_CTX_free(ctx);
+
+    CONSUME_REDS(env, in);
+    return out;
+
+out_err:
+    EVP_CIPHER_CTX_free(ctx);
+    return atom_error;
+#else
+    return enif_raise_exception(env, atom_notsup);
+#endif
+}