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-rw-r--r--src/lib/crypt.c338
1 files changed, 277 insertions, 61 deletions
diff --git a/src/lib/crypt.c b/src/lib/crypt.c
index 9728ac8c..e4b65cf0 100644
--- a/src/lib/crypt.c
+++ b/src/lib/crypt.c
@@ -27,10 +27,14 @@
#include <config.h>
#include <ouroboros/errno.h>
+#include <ouroboros/pthread.h>
#include <ouroboros/random.h>
#include <ouroboros/crypt.h>
+#include "crypt/keyrot.h"
+
#ifdef HAVE_OPENSSL
+#include <openssl/crypto.h>
#include <openssl/evp.h>
#include "crypt/openssl.h"
#endif
@@ -50,18 +54,12 @@ static const struct nid_map cipher_nid_map[] = {
{NID_aes_192_gcm, "aes-192-gcm"},
{NID_aes_256_gcm, "aes-256-gcm"},
{NID_chacha20_poly1305, "chacha20-poly1305"},
- {NID_aes_128_ctr, "aes-128-ctr"},
- {NID_aes_192_ctr, "aes-192-ctr"},
- {NID_aes_256_ctr, "aes-256-ctr"},
{NID_undef, NULL}
};
/* Ordered in strength preference, lowest first */
const uint16_t crypt_supported_nids[] = {
#ifdef HAVE_OPENSSL
- NID_aes_128_ctr,
- NID_aes_192_ctr,
- NID_aes_256_ctr,
NID_aes_128_gcm,
NID_aes_192_gcm,
NID_aes_256_gcm,
@@ -87,23 +85,23 @@ static const struct nid_map kex_nid_map[] = {
{NID_undef, NULL}
};
-/* Ordered in strength preference, lowest first */
+/* Ordered in strength preference, lowest first (NIST SP 800-57 levels) */
const uint16_t kex_supported_nids[] = {
#ifdef HAVE_OPENSSL
- NID_ffdhe2048,
- NID_X9_62_prime256v1,
- NID_X25519,
- NID_ffdhe3072,
- NID_secp384r1,
- NID_ffdhe4096,
- NID_X448,
- NID_secp521r1,
+ NID_ffdhe2048, /* FFDHE-2048, ~112-bit */
+ NID_X9_62_prime256v1, /* ECDH P-256, 128-bit */
+ NID_X25519, /* ECDH X25519, 128-bit */
+ NID_ffdhe3072, /* FFDHE-3072, ~128-bit */
+ NID_ffdhe4096, /* FFDHE-4096, ~152-bit */
+ NID_secp384r1, /* ECDH P-384, 192-bit */
+ NID_X448, /* ECDH X448, 224-bit */
+ NID_secp521r1, /* ECDH P-521, 256-bit */
#ifdef HAVE_OPENSSL_ML_KEM
- NID_MLKEM512,
- NID_MLKEM768,
- NID_MLKEM1024,
- NID_X25519MLKEM768,
- NID_X448MLKEM1024,
+ NID_MLKEM512, /* ML-KEM-512, PQC L1 (~AES-128) */
+ NID_MLKEM768, /* ML-KEM-768, PQC L3 (~AES-192) */
+ NID_MLKEM1024, /* ML-KEM-1024, PQC L5 (~AES-256) */
+ NID_X25519MLKEM768, /* X25519 + ML-KEM-768, PQC L3 */
+ NID_X448MLKEM1024, /* X448 + ML-KEM-1024, PQC L5 */
#endif
#endif
NID_undef
@@ -137,7 +135,8 @@ const uint16_t md_supported_nids[] = {
};
struct crypt_ctx {
- void * ctx; /* Encryption context */
+ struct keyrot * kr; /* backend-independent key rotation */
+ void * cipher; /* backend AEAD cipher context */
};
struct auth_ctx {
@@ -623,19 +622,71 @@ int crypt_kex_rank(int nid)
return -1;
}
-/* Hash length now returned by md_digest() */
+/* AEAD primitive: 1:1 backend wrappers used by the data path below. */
+static int crypt_seal(void * cipher,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ uint8_t * out,
+ uint8_t * tag)
+{
+#ifdef HAVE_OPENSSL
+ return openssl_seal(cipher, key, nonce, aad, in, out, tag);
+#else
+ (void) cipher;
+ (void) key;
+ (void) nonce;
+ (void) aad;
+ (void) in;
+ (void) out;
+ (void) tag;
-int crypt_encrypt(struct crypt_ctx * ctx,
- buffer_t in,
- buffer_t * out)
+ return -ECRYPT;
+#endif
+}
+
+static int crypt_open(void * cipher,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ const uint8_t * tag,
+ buffer_t * out)
{
- assert(ctx != NULL);
- assert(ctx->ctx != NULL);
+#ifdef HAVE_OPENSSL
+ return openssl_open(cipher, key, nonce, aad, in, tag, out);
+#else
+ (void) cipher;
+ (void) key;
+ (void) nonce;
+ (void) aad;
+ (void) in;
+ (void) tag;
+ (void) out;
+
+ return -ECRYPT;
+#endif
+}
+
+int crypt_oneshot_seal(int nid,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ buffer_t * out)
+{
+ assert(key != NULL);
+ assert(nonce != NULL);
+ assert(out != NULL);
#ifdef HAVE_OPENSSL
- return openssl_encrypt(ctx->ctx, in, out);
+ return openssl_oneshot_seal(nid, key, nonce, aad, in, out);
#else
- (void) ctx;
+ (void) nid;
+ (void) key;
+ (void) nonce;
+ (void) aad;
(void) in;
(void) out;
@@ -643,17 +694,24 @@ int crypt_encrypt(struct crypt_ctx * ctx,
#endif
}
-int crypt_decrypt(struct crypt_ctx * ctx,
- buffer_t in,
- buffer_t * out)
+int crypt_oneshot_open(int nid,
+ const uint8_t * key,
+ const uint8_t * nonce,
+ buffer_t aad,
+ buffer_t in,
+ buffer_t * out)
{
- assert(ctx != NULL);
- assert(ctx->ctx != NULL);
+ assert(key != NULL);
+ assert(nonce != NULL);
+ assert(out != NULL);
#ifdef HAVE_OPENSSL
- return openssl_decrypt(ctx->ctx, in, out);
+ return openssl_oneshot_open(nid, key, nonce, aad, in, out);
#else
- (void) ctx;
+ (void) nid;
+ (void) key;
+ (void) nonce;
+ (void) aad;
(void) in;
(void) out;
@@ -661,6 +719,115 @@ int crypt_decrypt(struct crypt_ctx * ctx,
#endif
}
+/*
+ * Data-path encrypt: rotate the key, frame selector ‖ ct ‖ tag, seal.
+ * Backend-agnostic: composed from keyrot_*, crypt_seal and crypt_get_tagsz.
+ */
+int crypt_encrypt(struct crypt_ctx * ctx,
+ buffer_t in,
+ buffer_t * out)
+{
+ uint8_t nonce[KR_NONCE_LEN];
+ const uint8_t * key;
+ uint8_t * ct;
+ buffer_t aad;
+ int tagsz;
+ int out_sz;
+
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
+
+ tagsz = crypt_get_tagsz(ctx);
+ if (tagsz < 0)
+ return -ECRYPT;
+
+ out->data = malloc(KR_SELECTOR_LEN + in.len + (size_t) tagsz);
+ if (out->data == NULL)
+ goto fail_malloc;
+
+ ct = out->data + KR_SELECTOR_LEN;
+
+ /* keyrot writes the selector into the wire header (== AAD). */
+ if (keyrot_tx_next(ctx->kr, out->data, &key, nonce) != 0)
+ goto fail_encrypt;
+
+ aad.data = out->data;
+ aad.len = KR_SELECTOR_LEN;
+
+ out_sz = crypt_seal(ctx->cipher, key, nonce, aad, in, ct, ct + in.len);
+ if (out_sz < 0)
+ goto fail_encrypt;
+
+ out->len = KR_SELECTOR_LEN + (size_t) out_sz + (size_t) tagsz;
+
+ return 0;
+ fail_encrypt:
+ free(out->data);
+ fail_malloc:
+ clrbuf(*out);
+ return -ECRYPT;
+}
+
+/*
+ * Data-path decrypt: look up the rotated key from the selector, open, and
+ * commit the replay window only after the tag verifies.
+ */
+int crypt_decrypt(struct crypt_ctx * ctx,
+ buffer_t in,
+ buffer_t * out)
+{
+ uint8_t nonce[KR_NONCE_LEN];
+ const uint8_t * key;
+ const uint8_t * tag;
+ struct kr_rx rx;
+ buffer_t aad;
+ buffer_t ct;
+ int tagsz;
+ int in_sz;
+
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
+
+ tagsz = crypt_get_tagsz(ctx);
+ if (tagsz < 0)
+ return -ECRYPT;
+
+ if (in.len < (size_t) (KR_SELECTOR_LEN + tagsz))
+ return -ECRYPT;
+
+ if (keyrot_rx_lookup(ctx->kr, in.data, &key, nonce, &rx) != 0)
+ return -ECRYPT;
+
+ in_sz = (int) in.len - KR_SELECTOR_LEN - tagsz;
+
+ /* +1 keeps malloc(0) defined for an empty (zero-length) frame. */
+ out->data = malloc((size_t) in_sz + 1);
+ if (out->data == NULL)
+ goto fail_malloc;
+
+ aad.data = in.data;
+ aad.len = KR_SELECTOR_LEN;
+
+ ct.data = in.data + KR_SELECTOR_LEN;
+ ct.len = (size_t) in_sz;
+
+ tag = in.data + KR_SELECTOR_LEN + in_sz;
+
+ if (crypt_open(ctx->cipher, key, nonce, aad, ct, tag, out) < 0)
+ goto fail_decrypt;
+
+ /* Commit replay state only after the tag verifies. */
+ if (keyrot_rx_commit(ctx->kr, &rx) != 0)
+ goto fail_decrypt;
+
+ return 0;
+ fail_decrypt:
+ free(out->data);
+ fail_malloc:
+ clrbuf(*out);
+ return -ECRYPT;
+}
+
struct crypt_ctx * crypt_create_ctx(struct crypt_sk * sk)
{
struct crypt_ctx * crypt;
@@ -674,16 +841,23 @@ struct crypt_ctx * crypt_create_ctx(struct crypt_sk * sk)
memset(crypt, 0, sizeof(*crypt));
+ crypt->kr = keyrot_create(sk->key, sk->epoch, sk->role);
+ if (crypt->kr == NULL)
+ goto fail_kr;
+
#ifdef HAVE_OPENSSL
- crypt->ctx = openssl_crypt_create_ctx(sk);
- if (crypt->ctx == NULL)
- goto fail_ctx;
+ crypt->cipher = openssl_crypt_create_ctx(sk);
+ if (crypt->cipher == NULL)
+ goto fail_cipher;
#endif
return crypt;
+
#ifdef HAVE_OPENSSL
- fail_ctx:
- free(crypt);
+ fail_cipher:
+ keyrot_destroy(crypt->kr);
#endif
+ fail_kr:
+ free(crypt);
fail_crypt:
return NULL;
}
@@ -693,43 +867,70 @@ void crypt_destroy_ctx(struct crypt_ctx * crypt)
if (crypt == NULL)
return;
+ keyrot_destroy(crypt->kr);
#ifdef HAVE_OPENSSL
- assert(crypt->ctx != NULL);
- openssl_crypt_destroy_ctx(crypt->ctx);
-#else
- assert(crypt->ctx == NULL);
+ openssl_crypt_destroy_ctx(crypt->cipher);
#endif
free(crypt);
}
-int crypt_get_ivsz(struct crypt_ctx * ctx)
+int crypt_get_headsz(struct crypt_ctx * ctx)
{
- if (ctx == NULL)
- return -EINVAL;
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
-#ifdef HAVE_OPENSSL
- assert(ctx->ctx != NULL);
- return openssl_crypt_get_ivsz(ctx->ctx);
-#else
- assert(ctx->ctx == NULL);
- return -ENOTSUP;
-#endif
+ (void) ctx; /* validated only; header size is a constant */
+
+ return KR_SELECTOR_LEN;
+}
+
+int crypt_rekey(struct crypt_ctx * ctx,
+ struct crypt_sk * sk)
+{
+ assert(ctx != NULL);
+ assert(sk != NULL);
+ assert(ctx->kr != NULL);
+
+ return keyrot_rekey(ctx->kr, sk->key, sk->epoch) == 0 ? 0 : -ECRYPT;
}
int crypt_get_tagsz(struct crypt_ctx * ctx)
{
- if (ctx == NULL)
- return -EINVAL;
+ assert(ctx != NULL);
+ assert(ctx->cipher != NULL);
#ifdef HAVE_OPENSSL
- assert(ctx->ctx != NULL);
- return openssl_crypt_get_tagsz(ctx->ctx);
+ return openssl_crypt_get_tagsz(ctx->cipher);
#else
- assert(ctx->ctx == NULL);
+ (void) ctx;
return -ENOTSUP;
#endif
}
+int crypt_nodes_left(struct crypt_ctx * ctx)
+{
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
+
+ return (int) keyrot_tx_nodes_left(ctx->kr);
+}
+
+int crypt_peer_synced(struct crypt_ctx * ctx)
+{
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
+
+ return keyrot_peer_switched(ctx->kr) ? 1 : 0;
+}
+
+void crypt_tx_promote(struct crypt_ctx * ctx)
+{
+ assert(ctx != NULL);
+ assert(ctx->kr != NULL);
+
+ keyrot_tx_promote(ctx->kr);
+}
+
int crypt_load_privkey_file(const char * path,
void ** key)
{
@@ -1157,10 +1358,25 @@ ssize_t md_len(int md_nid)
#endif
}
+int crypt_hkdf_expand(buffer_t key,
+ buffer_t info,
+ buffer_t out)
+{
+#ifdef HAVE_OPENSSL
+ return openssl_hkdf_expand(key, info, out) == 0 ? 0 : -ECRYPT;
+#else
+ (void) key;
+ (void) info;
+ (void) out;
+
+ return -ECRYPT;
+#endif
+}
+
int crypt_secure_malloc_init(size_t max)
{
#ifdef HAVE_OPENSSL
- return openssl_secure_malloc_init(max, SECMEM_GUARD);
+ return openssl_secure_malloc_init(max, SECMEM_MINSIZE);
#else
(void) max;
return 0;
generated by cgit v1.2.3 (git 2.39.1) at 2026-07-01 09:33:23 +0000