implemented client-server connection, but found out RSA is broken

src/cryptography/AES.c

@@ -4,15 +4,13 @@
 // write data from src to array and increment array data pointer
 static inline void __Array_writeNext(Array(u8)* dst, u8* src, size_t size){
     memcpy(dst->data, src, size);
-    dst->data = (u8*)dst->data + size;
-    dst->size -= size;
+    *dst = Array_sliceAfter(*dst, size);
 }
 
 // read data from array to dst and increment array data pointer
 static inline void __Array_readNext(u8* dst, Array(u8)* src, size_t size){
     memcpy(dst, src->data, size);
-    src->data = (u8*)src->data + size;
-    src->size -= size;
+    *src = Array_sliceAfter(*src, size);
 }
 
 

src/cryptography/RSA.c

@@ -31,7 +31,7 @@ Result(void) RSA_generateKeyPair(u32 key_size,
     Return RESULT_VOID;
 }
 
-Result(void) RSA_generateKeyPairFromTime(u32 key_size, 
+Result(void) RSA_generateKeyPairFromSystemRandom(u32 key_size, 
     br_rsa_private_key* sk, br_rsa_public_key* pk)
 {
     Deferral(8);
@@ -122,7 +122,7 @@ Result(void) RSA_parsePublicKey_base64(const str src, br_rsa_public_key* pk){
     pk->elen = 4;
     pk->nlen = key_buffer_size - 4;
     pk->e = pk->n + pk->nlen;
-    u32 offset = str_seekChar(src, ':', 14) + 1;
+    u32 offset = str_seekChar(src, ':', 10) + 1;
     if(offset == 0){
         Return RESULT_ERROR("missing ':' before key data", false);
     }
@@ -155,7 +155,7 @@ Result(void) RSA_parsePrivateKey_base64(const str src, br_rsa_private_key* sk){
     sk->dp = sk->q + field_len;
     sk->dq = sk->dp + field_len;
     sk->iq = sk->dq + field_len;
-    u32 offset = str_seekChar(src, ':', 14) + 1;
+    u32 offset = str_seekChar(src, ':', 10) + 1;
     if(offset == 0){
         Return RESULT_ERROR("missing ':' before key data", false);
     }

src/cryptography/RSA.h

@@ -12,7 +12,7 @@
 
 #define RSA_DEFAULT_KEY_SIZE 3072
 
-/// @brief generate random key pair based on system time
+/// @brief generate random key pair
 /// @param key_size size of public key in bits (2048/3072/4096)
 /// @param sk key for decryption
 /// @param pk key for encryption
@@ -21,7 +21,8 @@ Result(void) RSA_generateKeyPair(u32 key_size,
     br_rsa_private_key* sk, br_rsa_public_key* pk,
     const br_prng_class** rng_vtable_ptr);
 
-Result(void) RSA_generateKeyPairFromTime(u32 key_size, 
+/// @brief generate random key pair using system crypto-rng provider
+Result(void) RSA_generateKeyPairFromSystemRandom(u32 key_size, 
     br_rsa_private_key* sk, br_rsa_public_key* pk);
 
 Result(void) RSA_generateKeyPairFromPassword(u32 key_size,