openssl command encrypt data does not match EVP_aes_128_cbc - c++

Question

I tried the following C implementation of Openssl EVP function for AES-128-CBC encryption but the results I am getting are incorrect compared to the command line OpenSSL result.
I referenced the code on the site below.
https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption
C code implementation of AES-128-CBC:
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <string.h>
void handleErrors(void)
{
ERR_print_errors_fp(stderr);
abort();
}
int encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
unsigned char *iv, unsigned char *ciphertext)
{
EVP_CIPHER_CTX *ctx;
int len;
int ciphertext_len;
if(!(ctx = EVP_CIPHER_CTX_new()))
handleErrors();
if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv))
handleErrors();
if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
handleErrors();
ciphertext_len = len;
if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len))
handleErrors();
ciphertext_len += len;
/* Clean up */
EVP_CIPHER_CTX_free(ctx);
return ciphertext_len;
}
int decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *key,
unsigned char *iv, unsigned char *plaintext)
{
EVP_CIPHER_CTX *ctx;
int len;
int plaintext_len;
/* Create and initialise the context */
if(!(ctx = EVP_CIPHER_CTX_new()))
handleErrors();
if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, key, iv))
handleErrors();
if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
handleErrors();
plaintext_len = len;
if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len))
handleErrors();
plaintext_len += len;
/* Clean up */
EVP_CIPHER_CTX_free(ctx);
return plaintext_len;
}
int main (void)
{
/* A 128 bit key */
unsigned char *key = (unsigned char *)"A[u#AD22ZAWm/3=E";
/* A 128 bit IV */
unsigned char *iv = (unsigned char *)"0";
/* Message to be encrypted */
unsigned char *plaintext =
(unsigned char *)"The quick brown fox jumps over the lazy dog";
/*
* Buffer for ciphertext. Ensure the buffer is long enough for the
* ciphertext which may be longer than the plaintext, depending on the
* algorithm and mode.
*/
unsigned char ciphertext[128];
/* Buffer for the decrypted text */
unsigned char decryptedtext[128];
int decryptedtext_len, ciphertext_len;
/* Encrypt the plaintext */
ciphertext_len = encrypt (plaintext, strlen ((char *)plaintext), key, iv,
ciphertext);
/* Do something useful with the ciphertext here */
printf("Ciphertext is:\n");
BIO_dump_fp (stdout, (const char *)ciphertext, ciphertext_len);
/* Decrypt the ciphertext */
decryptedtext_len = decrypt(ciphertext, ciphertext_len, key, iv,
decryptedtext);
/* Add a NULL terminator. We are expecting printable text */
decryptedtext[decryptedtext_len] = '\0';
/* Show the decrypted text */
printf("Decrypted text is:\n");
printf("%s\n", decryptedtext);
return 0;
}
Output:
Ciphertext is:
0000 - 4f 21 68 b5 e9 90 b8 82-71 f2 d2 cd 60 2e fd f1 O!h.....q...`...
0010 - 48 10 d0 e4 f2 58 86 96-22 fa a5 d2 b6 9a 66 87 H....X..".....f.
0020 - e8 e6 bd 9e 73 ad 1e 0e-ec 0a f0 8b 11 83 9d 04 ....s...........
Decrypted text is:
The quick brown fox jumps over the lazy dog
OpenSSL command line:
echo "The quick brown fox jumps over the lazy dog" | openssl enc -e -aes-128-cbc -K 415b7540414432325a41576d2f333d45 -iv 30000000000000000000000000000000 | xxd
Updated WRT suggestion :
echo -n "The quick brown fox jumps over the lazy dog" | openssl enc -e -aes-128-cbc -K 415b7540414432325a41576d2f333d45 -iv 30 | xxd
OpenSSL Output:
00000000: 29d1 cf44 9246 fd7c 48a9 2261 afc1 6b34 )..D.F.|H."a..k4
00000010: ca5c c44d eddd 27a0 d64d 9679 81e4 fcb1 .\.M..'..M.y....
00000020: 9f10 0e47 ef73 37fa 5aa8 1a85 ec70 05c6 ...G.s7.Z....p..
Why are the output results different ( key and iv are both in hex) ?
I understand that the usage of iv "0" isnt recommended.
But if the iv is "0" what should be the hex value considered to match the encryption in command line.
PS : changing IV in code isnt an option for me :(