Hi all
I created a shared key based on a DH exchange and want to use that key
with a symmetric encryption algorithm. This key has a length of 16 Bytes
(128 bit). Here is what I do to initialize AES:
char *key,*iv;
// DH exchange which ends with a 16B value in key
RAND_pseudo_bytes(iv,16);
EVP_EncryptInit(&enc_ctx,EVP_aes_128_cbc(),NULL,NULL);
EVP_CIPHER_CTX_set_key_length(&enc_ctx,16);
EVP_EncryptInit(&enc_ctx,NULL,skey,iv);
None of the functions seems to generate an error. I checked that by
calling ERR_print_errors_fp. However when I check the key length
printf("key len: %d\n",EVP_CIPHER_key_length(&enc_ctx));
It returns 1. Shouldn't it return 16? I guess I make a mistake when
setting the key, but where?
best regards
Carolin
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