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Diffstat (limited to 'lib/libcrypto/evp/e_chacha20poly1305.c')
-rw-r--r--lib/libcrypto/evp/e_chacha20poly1305.c137
1 files changed, 67 insertions, 70 deletions
diff --git a/lib/libcrypto/evp/e_chacha20poly1305.c b/lib/libcrypto/evp/e_chacha20poly1305.c
index 9df6b7c453f..6e4a3f507aa 100644
--- a/lib/libcrypto/evp/e_chacha20poly1305.c
+++ b/lib/libcrypto/evp/e_chacha20poly1305.c
@@ -6,7 +6,7 @@
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
@@ -63,24 +63,24 @@
#define POLY1305_TAG_LEN 16
#define CHACHA20_NONCE_LEN 8
-struct aead_chacha20_poly1305_ctx
- {
+struct aead_chacha20_poly1305_ctx {
unsigned char key[32];
unsigned char tag_len;
- };
+};
-static int aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len, size_t tag_len)
- {
+static int
+aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const unsigned char *key,
+ size_t key_len, size_t tag_len)
+{
struct aead_chacha20_poly1305_ctx *c20_ctx;
if (tag_len == 0)
tag_len = POLY1305_TAG_LEN;
- if (tag_len > POLY1305_TAG_LEN)
- {
+ if (tag_len > POLY1305_TAG_LEN) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_INIT, EVP_R_TOO_LARGE);
return 0;
- }
+ }
if (key_len != sizeof(c20_ctx->key))
return 0; /* internal error - EVP_AEAD_CTX_init should catch this. */
@@ -94,38 +94,39 @@ static int aead_chacha20_poly1305_init(EVP_AEAD_CTX *ctx, const unsigned char *k
ctx->aead_state = c20_ctx;
return 1;
- }
+}
-static void aead_chacha20_poly1305_cleanup(EVP_AEAD_CTX *ctx)
- {
+static void
+aead_chacha20_poly1305_cleanup(EVP_AEAD_CTX *ctx)
+{
struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state;
OPENSSL_cleanse(c20_ctx->key, sizeof(c20_ctx->key));
OPENSSL_free(c20_ctx);
- }
+}
-static void poly1305_update_with_length(poly1305_state *poly1305,
- const unsigned char *data, size_t data_len)
- {
+static void
+poly1305_update_with_length(poly1305_state *poly1305,
+ const unsigned char *data, size_t data_len)
+{
size_t j = data_len;
unsigned char length_bytes[8];
unsigned i;
- for (i = 0; i < sizeof(length_bytes); i++)
- {
+ for (i = 0; i < sizeof(length_bytes); i++) {
length_bytes[i] = j;
j >>= 8;
- }
+ }
CRYPTO_poly1305_update(poly1305, data, data_len);
CRYPTO_poly1305_update(poly1305, length_bytes, sizeof(length_bytes));
}
-static ssize_t aead_chacha20_poly1305_seal(const EVP_AEAD_CTX *ctx,
- unsigned char *out, size_t max_out_len,
- const unsigned char *nonce, size_t nonce_len,
- const unsigned char *in, size_t in_len,
- const unsigned char *ad, size_t ad_len)
- {
+static ssize_t
+aead_chacha20_poly1305_seal(const EVP_AEAD_CTX *ctx, unsigned char *out,
+ size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
+ const unsigned char *in, size_t in_len, const unsigned char *ad,
+ size_t ad_len)
+{
const struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state;
unsigned char poly1305_key[32];
poly1305_state poly1305;
@@ -138,50 +139,48 @@ static ssize_t aead_chacha20_poly1305_seal(const EVP_AEAD_CTX *ctx,
* 32-bits and this produces a warning because it's always false.
* Casting to uint64_t inside the conditional is not sufficient to stop
* the warning. */
- if (in_len_64 >= (1ull << 32)*64-64)
- {
+ if (in_len_64 >= (1ull << 32)*64 - 64) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_TOO_LARGE);
return -1;
- }
+ }
- if (max_out_len < in_len + c20_ctx->tag_len)
- {
- EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_BUFFER_TOO_SMALL);
+ if (max_out_len < in_len + c20_ctx->tag_len) {
+ EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL,
+ EVP_R_BUFFER_TOO_SMALL);
return -1;
- }
+ }
- if (nonce_len != CHACHA20_NONCE_LEN)
- {
+ if (nonce_len != CHACHA20_NONCE_LEN) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_SEAL, EVP_R_IV_TOO_LARGE);
return -1;
- }
+ }
memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), c20_ctx->key, nonce, 0);
+ CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key),
+ c20_ctx->key, nonce, 0);
CRYPTO_poly1305_init(&poly1305, poly1305_key);
poly1305_update_with_length(&poly1305, ad, ad_len);
CRYPTO_chacha_20(out, in, in_len, c20_ctx->key, nonce, 1);
poly1305_update_with_length(&poly1305, out, in_len);
- if (c20_ctx->tag_len != POLY1305_TAG_LEN)
- {
+ if (c20_ctx->tag_len != POLY1305_TAG_LEN) {
unsigned char tag[POLY1305_TAG_LEN];
CRYPTO_poly1305_finish(&poly1305, tag);
memcpy(out + in_len, tag, c20_ctx->tag_len);
return in_len + c20_ctx->tag_len;
- }
+ }
CRYPTO_poly1305_finish(&poly1305, out + in_len);
return in_len + POLY1305_TAG_LEN;
- }
+}
-static ssize_t aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx,
- unsigned char *out, size_t max_out_len,
- const unsigned char *nonce, size_t nonce_len,
- const unsigned char *in, size_t in_len,
- const unsigned char *ad, size_t ad_len)
- {
+static ssize_t
+aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx, unsigned char *out,
+ size_t max_out_len, const unsigned char *nonce, size_t nonce_len,
+ const unsigned char *in, size_t in_len, const unsigned char *ad,
+ size_t ad_len)
+{
const struct aead_chacha20_poly1305_ctx *c20_ctx = ctx->aead_state;
unsigned char mac[POLY1305_TAG_LEN];
unsigned char poly1305_key[32];
@@ -189,11 +188,10 @@ static ssize_t aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx,
poly1305_state poly1305;
const uint64_t in_len_64 = in_len;
- if (in_len < c20_ctx->tag_len)
- {
+ if (in_len < c20_ctx->tag_len) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BAD_DECRYPT);
return -1;
- }
+ }
/* The underlying ChaCha implementation may not overflow the block
* counter into the second counter word. Therefore we disallow
@@ -202,46 +200,44 @@ static ssize_t aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx,
* 32-bits and this produces a warning because it's always false.
* Casting to uint64_t inside the conditional is not sufficient to stop
* the warning. */
- if (in_len_64 >= (1ull << 32)*64-64)
- {
+ if (in_len_64 >= (1ull << 32)*64 - 64) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_TOO_LARGE);
return -1;
- }
+ }
- if (nonce_len != CHACHA20_NONCE_LEN)
- {
+ if (nonce_len != CHACHA20_NONCE_LEN) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_IV_TOO_LARGE);
return -1;
- }
+ }
out_len = in_len - c20_ctx->tag_len;
- if (max_out_len < out_len)
- {
- EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BUFFER_TOO_SMALL);
+ if (max_out_len < out_len) {
+ EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN,
+ EVP_R_BUFFER_TOO_SMALL);
return -1;
- }
+ }
memset(poly1305_key, 0, sizeof(poly1305_key));
- CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key), c20_ctx->key, nonce, 0);
+ CRYPTO_chacha_20(poly1305_key, poly1305_key, sizeof(poly1305_key),
+ c20_ctx->key, nonce, 0);
CRYPTO_poly1305_init(&poly1305, poly1305_key);
poly1305_update_with_length(&poly1305, ad, ad_len);
poly1305_update_with_length(&poly1305, in, out_len);
CRYPTO_poly1305_finish(&poly1305, mac);
- if (CRYPTO_memcmp(mac, in + out_len, c20_ctx->tag_len) != 0)
- {
+ if (CRYPTO_memcmp(mac, in + out_len, c20_ctx->tag_len) != 0) {
EVPerr(EVP_F_AEAD_CHACHA20_POLY1305_OPEN, EVP_R_BAD_DECRYPT);
return -1;
- }
+ }
CRYPTO_chacha_20(out, in, out_len, c20_ctx->key, nonce, 1);
+
return out_len;
- }
+}
-static const EVP_AEAD aead_chacha20_poly1305 =
- {
+static const EVP_AEAD aead_chacha20_poly1305 = {
32, /* key len */
CHACHA20_NONCE_LEN, /* nonce len */
POLY1305_TAG_LEN, /* overhead */
@@ -251,11 +247,12 @@ static const EVP_AEAD aead_chacha20_poly1305 =
aead_chacha20_poly1305_cleanup,
aead_chacha20_poly1305_seal,
aead_chacha20_poly1305_open,
- };
+};
-const EVP_AEAD *EVP_aead_chacha20_poly1305()
- {
+const EVP_AEAD *
+EVP_aead_chacha20_poly1305()
+{
return &aead_chacha20_poly1305;
- }
+}
#endif /* !OPENSSL_NO_CHACHA && !OPENSSL_NO_POLY1305 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 04:41:00 +0000