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Diffstat (limited to 'src/lib/crypt/openssl.c')
-rw-r--r--src/lib/crypt/openssl.c504
1 files changed, 229 insertions, 275 deletions
diff --git a/src/lib/crypt/openssl.c b/src/lib/crypt/openssl.c
index d4ffc00b..7a4abec9 100644
--- a/src/lib/crypt/openssl.c
+++ b/src/lib/crypt/openssl.c
@@ -53,27 +53,14 @@
#define HKDF_INFO_DHE "o7s-ossl-dhe"
#define HKDF_INFO_ENCAP "o7s-ossl-encap"
-#define HKDF_INFO_ROTATION "o7s-key-rotation"
#define HKDF_SALT_LEN 32 /* SHA-256 output size */
+#define AEAD_NONCE_LEN 12 /* 96-bit deterministic IV (SP 800-38D) */
+#define AEAD_TAG_LEN 16 /* 128-bit AEAD authentication tag */
struct ossl_crypt_ctx {
EVP_CIPHER_CTX * evp_ctx;
const EVP_CIPHER * cipher;
- int ivsz;
int tagsz;
-
- struct {
- uint8_t * cur; /* current key */
- uint8_t * prv; /* rotated key */
- } keys;
-
- struct {
- uint32_t cntr; /* counter */
- uint32_t mask; /* phase mask */
- uint32_t age; /* counter within epoch */
- uint8_t phase; /* current key phase */
- uint8_t salt[HKDF_SALT_LEN];
- } rot; /* rotation logic */
};
struct kdf_info {
@@ -84,17 +71,6 @@ struct kdf_info {
buffer_t key;
};
-/* Key rotation macros */
-#define HAS_PHASE_BIT_TOGGLED(ctx) \
- (((ctx)->rot.cntr & (ctx)->rot.mask) != \
- (((ctx)->rot.cntr - 1) & (ctx)->rot.mask))
-
-#define HAS_GRACE_EXPIRED(ctx) \
- ((ctx)->rot.age >= ((ctx)->rot.mask >> 1))
-
-#define ROTATION_TOO_RECENT(ctx) \
- ((ctx)->rot.age < ((ctx)->rot.mask - ((ctx)->rot.mask >> 2)))
-
/* Convert hash NID to OpenSSL digest name string for HKDF */
static const char * hash_nid_to_digest_name(int nid)
{
@@ -145,21 +121,20 @@ static int get_pk_bytes_from_key(EVP_PKEY * key,
}
/* Derive salt from public key bytes by hashing them */
-static int derive_salt_from_pk_bytes(buffer_t pk,
- uint8_t * salt,
- size_t salt_len)
+static int derive_salt_from_pk_bytes(buffer_t pk,
+ buffer_t salt)
{
uint8_t hash[EVP_MAX_MD_SIZE];
unsigned hash_len;
assert(pk.data != NULL);
- assert(salt != NULL);
+ assert(salt.data != NULL);
if (EVP_Digest(pk.data, pk.len, hash, &hash_len,
EVP_sha256(), NULL) != 1)
goto fail_digest;
- memcpy(salt, hash, salt_len < hash_len ? salt_len : hash_len);
+ memcpy(salt.data, hash, salt.len < hash_len ? salt.len : hash_len);
return 0;
fail_digest:
@@ -167,10 +142,9 @@ static int derive_salt_from_pk_bytes(buffer_t pk,
}
/* Derive salt from two public key byte buffers (DHE) in canonical order */
-static int derive_salt_from_pk_bytes_dhe(buffer_t local,
- buffer_t remote,
- uint8_t * salt,
- size_t salt_len)
+static int derive_salt_from_pk_bytes_dhe(buffer_t local,
+ buffer_t remote,
+ buffer_t salt)
{
uint8_t * concat;
size_t concat_len;
@@ -181,7 +155,7 @@ static int derive_salt_from_pk_bytes_dhe(buffer_t local,
assert(local.data != NULL);
assert(remote.data != NULL);
- assert(salt != NULL);
+ assert(salt.data != NULL);
concat_len = local.len + remote.len;
concat = OPENSSL_malloc(concat_len);
@@ -205,7 +179,7 @@ static int derive_salt_from_pk_bytes_dhe(buffer_t local,
OPENSSL_free(concat);
- memcpy(salt, hash, salt_len < hash_len ? salt_len : hash_len);
+ memcpy(salt.data, hash, salt.len < hash_len ? salt.len : hash_len);
return 0;
fail_digest:
@@ -259,117 +233,144 @@ static int derive_key_hkdf(struct kdf_info * ki)
return -ECRYPT;
}
-/* Key rotation helper functions implementation */
-static int should_rotate_key_rx(struct ossl_crypt_ctx * ctx,
- uint8_t rx_phase)
+int openssl_hkdf_expand(buffer_t key,
+ buffer_t info,
+ buffer_t out)
{
- assert(ctx != NULL);
+ EVP_KDF * kdf;
+ EVP_KDF_CTX * kctx;
+ OSSL_PARAM params[5];
+ int mode = EVP_KDF_HKDF_MODE_EXPAND_ONLY;
+ int idx = 0;
+ int ret = -1;
+
+ kdf = EVP_KDF_fetch(NULL, "HKDF", NULL);
+ if (kdf == NULL)
+ goto fail_fetch;
- /* Phase must have changed */
- if (rx_phase == ctx->rot.phase)
- return 0;
+ kctx = EVP_KDF_CTX_new(kdf);
+ if (kctx == NULL)
+ goto fail_ctx;
+
+ params[idx++] = OSSL_PARAM_construct_utf8_string(
+ "digest", (char *) "SHA256", 0);
+ params[idx++] = OSSL_PARAM_construct_int("mode", &mode);
+ params[idx++] = OSSL_PARAM_construct_octet_string(
+ "key", key.data, key.len);
+ params[idx++] = OSSL_PARAM_construct_octet_string(
+ "info", info.data, info.len);
+ params[idx] = OSSL_PARAM_construct_end();
- if (ROTATION_TOO_RECENT(ctx))
- return 0;
+ if (EVP_KDF_derive(kctx, out.data, out.len, params) == 1)
+ ret = 0;
- return 1;
+ EVP_KDF_CTX_free(kctx);
+ fail_ctx:
+ EVP_KDF_free(kdf);
+ fail_fetch:
+ return ret;
}
-static int rotate_key(struct ossl_crypt_ctx * ctx)
+/* AEAD seal: encrypt in with key/nonce, bind aad, append tag */
+int openssl_seal(struct ossl_crypt_ctx * ctx,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ uint8_t * out,
+ uint8_t * tag)
{
- struct kdf_info ki;
- uint8_t * tmp;
+ int out_sz;
+ int tmp_sz;
assert(ctx != NULL);
+ assert(ctx->tagsz > 0); /* AEAD mandated at ctx creation */
- /* Swap keys - move current to prev */
- tmp = ctx->keys.prv;
- ctx->keys.prv = ctx->keys.cur;
+ EVP_CIPHER_CTX_reset(ctx->evp_ctx);
- if (tmp != NULL) {
- /* Reuse old prev_key memory for new key */
- ctx->keys.cur = tmp;
- } else {
- /* First rotation - allocate new memory */
- ctx->keys.cur = OPENSSL_secure_malloc(SYMMKEYSZ);
- if (ctx->keys.cur == NULL)
- return -ECRYPT;
- }
+ if (EVP_EncryptInit_ex(ctx->evp_ctx, ctx->cipher, NULL,
+ NULL, NULL) != 1)
+ return -1;
- /* Derive new key from previous key using HKDF */
- ki.secret.data = ctx->keys.prv;
- ki.secret.len = SYMMKEYSZ;
- ki.nid = NID_sha256;
- ki.salt.data = ctx->rot.salt;
- ki.salt.len = HKDF_SALT_LEN;
- ki.info.data = (uint8_t *) HKDF_INFO_ROTATION;
- ki.info.len = strlen(HKDF_INFO_ROTATION);
- ki.key.data = ctx->keys.cur;
- ki.key.len = SYMMKEYSZ;
+ /* Pin the AEAD nonce to 96 bits (SP 800-38D deterministic IV). */
+ if (EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_SET_IVLEN,
+ AEAD_NONCE_LEN, NULL) != 1)
+ return -1;
- if (derive_key_hkdf(&ki) != 0)
- return -ECRYPT;
+ if (EVP_EncryptInit_ex(ctx->evp_ctx, NULL, NULL,
+ key, nonce) != 1)
+ return -1;
- ctx->rot.age = 0;
- ctx->rot.phase = !ctx->rot.phase;
+ if (EVP_EncryptUpdate(ctx->evp_ctx, NULL, &tmp_sz,
+ aad.data, (int) aad.len) != 1)
+ return -1;
- return 0;
-}
+ if (EVP_EncryptUpdate(ctx->evp_ctx, out, &out_sz,
+ in.data, (int) in.len) != 1)
+ return -1;
-static void cleanup_old_key(struct ossl_crypt_ctx * ctx)
-{
- assert(ctx != NULL);
+ if (EVP_EncryptFinal_ex(ctx->evp_ctx, out + out_sz, &tmp_sz) != 1)
+ return -1;
- if (ctx->keys.prv == NULL)
- return;
+ out_sz += tmp_sz;
- if (!HAS_GRACE_EXPIRED(ctx))
- return;
+ if (EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_GET_TAG,
+ ctx->tagsz, tag) != 1)
+ return -1;
- OPENSSL_secure_clear_free(ctx->keys.prv, SYMMKEYSZ);
- ctx->keys.prv = NULL;
+ return out_sz;
}
-static int try_decrypt(struct ossl_crypt_ctx * ctx,
- uint8_t * key,
- uint8_t * iv,
- uint8_t * input,
- int in_sz,
- uint8_t * out,
- int * out_sz)
+/* AEAD open: decrypt in with key/nonce, verify aad and tag */
+int openssl_open(struct ossl_crypt_ctx * ctx,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ const uint8_t * tag,
+ buffer_t * out)
{
- uint8_t * tag;
- int tmp_sz;
- int ret;
+ int out_sz;
+ int tmp_sz;
- tag = input + in_sz;
+ assert(ctx != NULL);
+ assert(ctx->tagsz > 0); /* AEAD mandated at ctx creation */
EVP_CIPHER_CTX_reset(ctx->evp_ctx);
- ret = EVP_DecryptInit_ex(ctx->evp_ctx, ctx->cipher, NULL, key, iv);
- if (ret != 1)
+ if (EVP_DecryptInit_ex(ctx->evp_ctx, ctx->cipher, NULL,
+ NULL, NULL) != 1)
return -1;
- if (ctx->tagsz > 0) {
- ret = EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_SET_TAG,
- ctx->tagsz, tag);
- if (ret != 1)
- return -1;
- }
+ /* Pin the AEAD nonce to 96 bits (SP 800-38D deterministic IV). */
+ if (EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_SET_IVLEN,
+ AEAD_NONCE_LEN, NULL) != 1)
+ return -1;
- ret = EVP_DecryptUpdate(ctx->evp_ctx, out, &tmp_sz, input, in_sz);
- if (ret != 1)
+ if (EVP_DecryptInit_ex(ctx->evp_ctx, NULL, NULL, key, nonce) != 1)
return -1;
- *out_sz = tmp_sz;
+ if (EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_SET_TAG,
+ ctx->tagsz, (void *) tag) != 1)
+ return -1;
- ret = EVP_DecryptFinal_ex(ctx->evp_ctx, out + tmp_sz, &tmp_sz);
- if (ret != 1)
+ if (EVP_DecryptUpdate(ctx->evp_ctx, NULL, &tmp_sz,
+ aad.data, (int) aad.len) != 1)
return -1;
- *out_sz += tmp_sz;
+ if (EVP_DecryptUpdate(ctx->evp_ctx, out->data, &out_sz,
+ in.data, (int) in.len) != 1)
+ return -1;
- return 0;
+ if (EVP_DecryptFinal_ex(ctx->evp_ctx, out->data + out_sz,
+ &tmp_sz) != 1)
+ return -1;
+
+ out_sz += tmp_sz;
+
+ out->len = (size_t) out_sz;
+
+ return out_sz;
}
/*
@@ -397,11 +398,14 @@ static int __openssl_dhe_derive(EVP_PKEY * pkp,
ret = i2d_PUBKEY(pkp, &local_pk.data);
if (ret <= 0)
goto fail_local;
+
local_pk.len = (size_t) ret;
+ ki.salt.len = HKDF_SALT_LEN;
+ ki.salt.data = salt_buf;
+
/* Derive salt from both public keys */
- if (derive_salt_from_pk_bytes_dhe(local_pk, remote_pk, salt_buf,
- HKDF_SALT_LEN) < 0)
+ if (derive_salt_from_pk_bytes_dhe(local_pk, remote_pk, ki.salt) < 0)
goto fail_salt;
ctx = EVP_PKEY_CTX_new(pkp, NULL);
@@ -438,8 +442,6 @@ static int __openssl_dhe_derive(EVP_PKEY * pkp,
ki.info.data = (uint8_t *) HKDF_INFO_DHE;
ki.key.len = SYMMKEYSZ;
ki.key.data = s;
- ki.salt.len = HKDF_SALT_LEN;
- ki.salt.data = salt_buf;
/* Derive symmetric key from shared secret using HKDF */
ret = derive_key_hkdf(&ki);
@@ -718,13 +720,17 @@ ssize_t openssl_kem_encap(buffer_t pk,
EVP_PKEY * pub;
uint8_t * pos;
uint8_t salt[HKDF_SALT_LEN];
+ buffer_t salt_b;
ssize_t ret;
assert(pk.data != NULL);
assert(ct != NULL);
assert(s != NULL);
- if (derive_salt_from_pk_bytes(pk, salt, HKDF_SALT_LEN) < 0)
+ salt_b.len = HKDF_SALT_LEN;
+ salt_b.data = salt;
+
+ if (derive_salt_from_pk_bytes(pk, salt_b) < 0)
goto fail_salt;
pos = pk.data;
@@ -750,13 +756,17 @@ ssize_t openssl_kem_encap_raw(buffer_t pk,
EVP_PKEY * pub;
const char * algo;
uint8_t salt[HKDF_SALT_LEN];
+ buffer_t salt_b;
ssize_t ret;
assert(pk.data != NULL);
assert(ct != NULL);
assert(s != NULL);
- if (derive_salt_from_pk_bytes(pk, salt, HKDF_SALT_LEN) < 0)
+ salt_b.len = HKDF_SALT_LEN;
+ salt_b.data = salt;
+
+ if (derive_salt_from_pk_bytes(pk, salt_b) < 0)
goto fail_salt;
algo = __openssl_hybrid_algo_from_len(pk.len);
@@ -790,12 +800,16 @@ int openssl_kem_decap(EVP_PKEY * priv,
size_t secret_len;
int ret;
uint8_t salt[HKDF_SALT_LEN];
+ buffer_t salt_b;
/* Extract public key bytes from private key */
if (get_pk_bytes_from_key(priv, &pk) < 0)
goto fail_pk;
- if (derive_salt_from_pk_bytes(pk, salt, HKDF_SALT_LEN) < 0)
+ salt_b.len = HKDF_SALT_LEN;
+ salt_b.data = salt;
+
+ if (derive_salt_from_pk_bytes(pk, salt_b) < 0)
goto fail_salt;
ctx = EVP_PKEY_CTX_new(priv, NULL);
@@ -858,13 +872,14 @@ void openssl_pkp_destroy(EVP_PKEY * pkp)
EVP_PKEY_free(pkp);
}
-int __openssl_get_curve(EVP_PKEY * pub,
- char * algo)
+static int openssl_get_curve(EVP_PKEY * pub,
+ char * algo)
{
int ret;
size_t len = KEX_ALGO_BUFSZ;
ret = EVP_PKEY_get_utf8_string_param(pub, "group", algo, len, &len);
+
return ret == 1 ? 0 : -ECRYPT;
}
@@ -889,9 +904,10 @@ int openssl_get_algo_from_pk_der(buffer_t pk,
strcpy(algo, type_str);
- if ((IS_EC_GROUP(algo) || IS_DH_GROUP(algo)) &&
- __openssl_get_curve(pub, algo) < 0)
- goto fail_pub;
+ if (IS_EC_GROUP(algo) || IS_DH_GROUP(algo)) {
+ if (openssl_get_curve(pub, algo) < 0)
+ goto fail_pub;
+ }
EVP_PKEY_free(pub);
return 0;
@@ -949,141 +965,122 @@ int openssl_dhe_derive(EVP_PKEY * pkp,
return -ECRYPT;
}
-int openssl_encrypt(struct ossl_crypt_ctx * ctx,
- buffer_t in,
- buffer_t * out)
+/* Set up a fresh AEAD cipher ctx for nid: reject non-AEAD / oversized IV. */
+static int ossl_cipher_ctx_init(struct ossl_crypt_ctx * ctx,
+ int nid)
{
- uint8_t * ptr;
- uint8_t * iv;
- int in_sz;
- int out_sz;
- int tmp_sz;
- int ret;
-
- assert(ctx != NULL);
-
- in_sz = (int) in.len;
-
- out->data = malloc(in.len + EVP_MAX_BLOCK_LENGTH + \
- ctx->ivsz + ctx->tagsz);
- if (out->data == NULL)
- goto fail_malloc;
-
- iv = out->data;
- ptr = out->data + ctx->ivsz;
+ ctx->cipher = EVP_get_cipherbynid(nid);
+ if (ctx->cipher == NULL)
+ return -1;
- if (random_buffer(iv, ctx->ivsz) < 0)
- goto fail_encrypt;
+ /* IV must fit the NONCESZ nonce buffer. */
+ if (EVP_CIPHER_get_iv_length(ctx->cipher) > NONCESZ)
+ return -1;
- /* Set IV bit 7 to current key phase (KEY_ROTATION_BIT of counter) */
- if (ctx->rot.cntr & ctx->rot.mask)
- iv[0] |= 0x80;
- else
- iv[0] &= 0x7F;
+ /* Authenticated encryption is mandatory; reject non-AEAD ciphers. */
+ if ((EVP_CIPHER_flags(ctx->cipher) & EVP_CIPH_FLAG_AEAD_CIPHER) == 0)
+ return -1;
- EVP_CIPHER_CTX_reset(ctx->evp_ctx);
+ ctx->tagsz = AEAD_TAG_LEN;
- ret = EVP_EncryptInit_ex(ctx->evp_ctx, ctx->cipher, NULL,
- ctx->keys.cur, iv);
- if (ret != 1)
- goto fail_encrypt;
+ ctx->evp_ctx = EVP_CIPHER_CTX_new();
+ if (ctx->evp_ctx == NULL)
+ return -1;
- ret = EVP_EncryptUpdate(ctx->evp_ctx, ptr, &tmp_sz, in.data, in_sz);
- if (ret != 1)
- goto fail_encrypt;
+ return 0;
+}
- out_sz = tmp_sz;
- ret = EVP_EncryptFinal_ex(ctx->evp_ctx, ptr + tmp_sz, &tmp_sz);
- if (ret != 1)
- goto fail_encrypt;
+/* One-shot AEAD seal over an explicit key/nonce (no keyrot). out = ct ‖ tag. */
+int openssl_oneshot_seal(int nid,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ buffer_t * out)
+{
+ struct ossl_crypt_ctx ctx;
+ int out_sz;
- out_sz += tmp_sz;
+ assert(key != NULL);
+ assert(nonce != NULL);
+ assert(out != NULL);
- /* For AEAD ciphers, get and append the authentication tag */
- if (ctx->tagsz > 0) {
- ret = EVP_CIPHER_CTX_ctrl(ctx->evp_ctx, EVP_CTRL_AEAD_GET_TAG,
- ctx->tagsz, ptr + out_sz);
- if (ret != 1)
- goto fail_encrypt;
- out_sz += ctx->tagsz;
- }
+ memset(&ctx, 0, sizeof(ctx));
- assert(out_sz >= in_sz);
+ if (ossl_cipher_ctx_init(&ctx, nid) < 0)
+ goto fail_cipher;
- out->len = (size_t) out_sz + ctx->ivsz;
+ out->data = malloc(in.len + EVP_MAX_BLOCK_LENGTH + ctx.tagsz);
+ if (out->data == NULL)
+ goto fail_ctx;
- /* Increment packet counter and check for key rotation */
- ctx->rot.cntr++;
- ctx->rot.age++;
+ out_sz = openssl_seal(&ctx, key, nonce, aad, in,
+ out->data, out->data + in.len);
+ if (out_sz < 0)
+ goto fail_seal;
- if (HAS_PHASE_BIT_TOGGLED(ctx)) {
- if (rotate_key(ctx) != 0)
- goto fail_encrypt;
- }
+ out->len = (size_t) out_sz + ctx.tagsz;
- cleanup_old_key(ctx);
+ EVP_CIPHER_CTX_free(ctx.evp_ctx);
return 0;
- fail_encrypt:
+
+ fail_seal:
free(out->data);
- fail_malloc:
+ fail_ctx:
+ EVP_CIPHER_CTX_free(ctx.evp_ctx);
+ fail_cipher:
clrbuf(*out);
return -ECRYPT;
}
-int openssl_decrypt(struct ossl_crypt_ctx * ctx,
- buffer_t in,
- buffer_t * out)
+/* One-shot AEAD open; in = ct ‖ tag, verifies aad and tag. */
+int openssl_oneshot_open(int nid,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ buffer_t * out)
{
- uint8_t * iv;
- uint8_t * input;
- uint8_t rx_phase;
- int out_sz;
- int in_sz;
-
- assert(ctx != NULL);
-
- in_sz = (int) in.len - ctx->ivsz;
- if (in_sz < ctx->tagsz)
- return -ECRYPT;
+ struct ossl_crypt_ctx ctx;
+ buffer_t ct;
+ const uint8_t * tag;
+ int in_sz;
- in_sz -= ctx->tagsz;
+ assert(key != NULL);
+ assert(nonce != NULL);
+ assert(out != NULL);
- out->data = malloc(in_sz + EVP_MAX_BLOCK_LENGTH);
- if (out->data == NULL)
- goto fail_malloc;
+ memset(&ctx, 0, sizeof(ctx));
- iv = in.data;
- input = in.data + ctx->ivsz;
+ if (ossl_cipher_ctx_init(&ctx, nid) < 0)
+ goto fail_cipher;
- /* Extract phase from IV bit 7 and check for key rotation */
- rx_phase = (iv[0] & 0x80) ? 1 : 0;
+ if (in.len < (size_t) ctx.tagsz)
+ goto fail_ctx;
- if (should_rotate_key_rx(ctx, rx_phase)) {
- if (rotate_key(ctx) != 0)
- goto fail_decrypt;
- }
+ in_sz = (int) in.len - ctx.tagsz;
- ctx->rot.cntr++;
- ctx->rot.age++;
+ out->data = malloc((size_t) in_sz + EVP_MAX_BLOCK_LENGTH);
+ if (out->data == NULL)
+ goto fail_ctx;
- if (try_decrypt(ctx, ctx->keys.cur, iv, input, in_sz, out->data,
- &out_sz) != 0) {
- if (ctx->keys.prv == NULL)
- goto fail_decrypt;
- if (try_decrypt(ctx, ctx->keys.prv, iv, input, in_sz,
- out->data, &out_sz) != 0)
- goto fail_decrypt;
- }
+ ct.data = in.data;
+ ct.len = (size_t) in_sz;
+ tag = in.data + in_sz;
- assert(out_sz <= in_sz);
+ if (openssl_open(&ctx, key, nonce, aad, ct, tag, out) < 0)
+ goto fail_open;
- out->len = (size_t) out_sz;
+ EVP_CIPHER_CTX_free(ctx.evp_ctx);
return 0;
- fail_decrypt:
+
+ fail_open:
free(out->data);
- fail_malloc:
+ fail_ctx:
+ EVP_CIPHER_CTX_free(ctx.evp_ctx);
+ fail_cipher:
clrbuf(*out);
return -ECRYPT;
}
@@ -1094,51 +1091,19 @@ struct ossl_crypt_ctx * openssl_crypt_create_ctx(struct crypt_sk * sk)
assert(sk != NULL);
assert(sk->key != NULL);
- assert(sk->rot_bit > 0 && sk->rot_bit < 32);
ctx = malloc(sizeof(*ctx));
if (ctx == NULL)
- goto fail_malloc;
+ goto fail_malloc;
memset(ctx, 0, sizeof(*ctx));
- ctx->keys.cur = OPENSSL_secure_malloc(SYMMKEYSZ);
- if (ctx->keys.cur == NULL)
- goto fail_key;
-
- memcpy(ctx->keys.cur, sk->key, SYMMKEYSZ);
-
- ctx->keys.prv = NULL;
-
- /* Derive rotation salt from initial shared secret */
- if (EVP_Digest(sk->key, SYMMKEYSZ, ctx->rot.salt, NULL,
- EVP_sha256(), NULL) != 1)
- goto fail_cipher;
-
- ctx->cipher = EVP_get_cipherbynid(sk->nid);
- if (ctx->cipher == NULL)
- goto fail_cipher;
-
- ctx->ivsz = EVP_CIPHER_iv_length(ctx->cipher);
-
- /* Set tag size for AEAD ciphers (GCM, CCM, OCB, ChaCha20-Poly1305) */
- if (EVP_CIPHER_flags(ctx->cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)
- ctx->tagsz = 16; /* Standard AEAD tag length (128 bits) */
-
- ctx->rot.cntr = 0;
- ctx->rot.mask = (1U << sk->rot_bit);
- ctx->rot.age = 0;
- ctx->rot.phase = 0;
-
- ctx->evp_ctx = EVP_CIPHER_CTX_new();
- if (ctx->evp_ctx == NULL)
+ if (ossl_cipher_ctx_init(ctx, sk->nid) < 0)
goto fail_cipher;
return ctx;
fail_cipher:
- OPENSSL_secure_clear_free(ctx->keys.cur, SYMMKEYSZ);
- fail_key:
free(ctx);
fail_malloc:
return NULL;
@@ -1149,23 +1114,10 @@ void openssl_crypt_destroy_ctx(struct ossl_crypt_ctx * ctx)
if (ctx == NULL)
return;
- if (ctx->keys.cur != NULL)
- OPENSSL_secure_clear_free(ctx->keys.cur, SYMMKEYSZ);
-
- if (ctx->keys.prv != NULL)
- OPENSSL_secure_clear_free(ctx->keys.prv, SYMMKEYSZ);
-
EVP_CIPHER_CTX_free(ctx->evp_ctx);
free(ctx);
}
-int openssl_crypt_get_ivsz(struct ossl_crypt_ctx * ctx)
-{
- assert(ctx != NULL);
-
- return ctx->ivsz;
-}
-
int openssl_crypt_get_tagsz(struct ossl_crypt_ctx * ctx)
{
assert(ctx != NULL);
@@ -1937,9 +1889,10 @@ void * openssl_secure_malloc(size_t size)
return OPENSSL_secure_malloc(size);
}
-void openssl_secure_free(void * ptr)
+void openssl_secure_free(void * ptr,
+ size_t size)
{
- OPENSSL_secure_free(ptr);
+ OPENSSL_secure_clear_free(ptr, size);
}
void openssl_secure_clear(void * ptr,
@@ -1947,6 +1900,7 @@ void openssl_secure_clear(void * ptr,
{
OPENSSL_cleanse(ptr, size);
}
+
void openssl_cleanup(void)
{
OPENSSL_cleanup();
generated by cgit v1.2.3 (git 2.39.1) at 2026-07-01 20:22:11 +0000