remove unused functions from provider interface

src/crypto_cc.c

@@ -154,14 +154,6 @@ static int sqlcipher_cc_get_hmac_sz(void *ctx, int algorithm) {
   }
 }
 
-static int sqlcipher_cc_ctx_copy(void *target_ctx, void *source_ctx) {
-  return SQLITE_OK;
-}
-
-static int sqlcipher_cc_ctx_cmp(void *c1, void *c2) {
-  return 1; /* always indicate contexts are the same */
-}
-
 static int sqlcipher_cc_ctx_init(void **ctx) {
   return SQLITE_OK;
 }
@@ -185,8 +177,6 @@ int sqlcipher_cc_setup(sqlcipher_provider *p) {
   p->get_iv_sz = sqlcipher_cc_get_iv_sz;
   p->get_block_sz = sqlcipher_cc_get_block_sz;
   p->get_hmac_sz = sqlcipher_cc_get_hmac_sz;
-  p->ctx_copy = sqlcipher_cc_ctx_copy;
-  p->ctx_cmp = sqlcipher_cc_ctx_cmp;
   p->ctx_init = sqlcipher_cc_ctx_init;
   p->ctx_free = sqlcipher_cc_ctx_free;
   p->add_random = sqlcipher_cc_add_random;

src/crypto_libtomcrypt.c

@@ -250,14 +250,6 @@ static int sqlcipher_ltc_get_hmac_sz(void *ctx, int algorithm) {
   return hash_descriptor[hash_idx].hashsize;
 }
 
-static int sqlcipher_ltc_ctx_copy(void *target_ctx, void *source_ctx) {
-  return SQLITE_OK;
-}
-
-static int sqlcipher_ltc_ctx_cmp(void *c1, void *c2) {
-  return 1;
-}
-
 static int sqlcipher_ltc_ctx_init(void **ctx) {
   sqlcipher_ltc_activate(NULL);
   return SQLITE_OK;
@@ -285,8 +277,6 @@ int sqlcipher_ltc_setup(sqlcipher_provider *p) {
   p->get_iv_sz = sqlcipher_ltc_get_iv_sz;
   p->get_block_sz = sqlcipher_ltc_get_block_sz;
   p->get_hmac_sz = sqlcipher_ltc_get_hmac_sz;
-  p->ctx_copy = sqlcipher_ltc_ctx_copy;
-  p->ctx_cmp = sqlcipher_ltc_ctx_cmp;
   p->ctx_init = sqlcipher_ltc_ctx_init;
   p->ctx_free = sqlcipher_ltc_ctx_free;
   p->add_random = sqlcipher_ltc_add_random;

src/crypto_openssl.c

@@ -323,15 +323,6 @@ static int sqlcipher_openssl_get_hmac_sz(void *ctx, int algorithm) {
   }
 }
 
-static int sqlcipher_openssl_ctx_copy(void *target_ctx, void *source_ctx) {
-  memcpy(target_ctx, source_ctx, sizeof(openssl_ctx));
-  return SQLITE_OK;
-}
-
-static int sqlcipher_openssl_ctx_cmp(void *c1, void *c2) {
-  return ((openssl_ctx *)c1)->evp_cipher == ((openssl_ctx *)c2)->evp_cipher;
-}
-
 static int sqlcipher_openssl_ctx_init(void **ctx) {
   openssl_ctx *o_ctx;
 
@@ -371,8 +362,6 @@ int sqlcipher_openssl_setup(sqlcipher_provider *p) {
   p->get_iv_sz = sqlcipher_openssl_get_iv_sz;
   p->get_block_sz = sqlcipher_openssl_get_block_sz;
   p->get_hmac_sz = sqlcipher_openssl_get_hmac_sz;
-  p->ctx_copy = sqlcipher_openssl_ctx_copy;
-  p->ctx_cmp = sqlcipher_openssl_ctx_cmp;
   p->ctx_init = sqlcipher_openssl_ctx_init;
   p->ctx_free = sqlcipher_openssl_ctx_free;
   p->add_random = sqlcipher_openssl_add_random;

src/sqlcipher.h

@@ -65,8 +65,6 @@ typedef struct {
   int (*get_iv_sz)(void *ctx);
   int (*get_block_sz)(void *ctx);
   int (*get_hmac_sz)(void *ctx, int algorithm);
-  int (*ctx_copy)(void *target_ctx, void *source_ctx);
-  int (*ctx_cmp)(void *c1, void *c2);
   int (*ctx_init)(void **ctx);
   int (*ctx_free)(void **ctx);
   int (*fips_status)(void *ctx);