Initialize a cipher context for decryption (legacy ENGINE-aware form).
Declared in <openssl/evp.h>
int
EVP_DecryptInit(
EVP_CIPHER_CTX* ctx,
EVP_CIPHER const* cipher,
unsigned char const* key,
unsigned char const* iv);Prefer EVP_DecryptInit_ex2() for new code.
1 on success, or 0 on failure.
| Name | Description |
|---|---|
| ctx | Cipher context to initialize. |
| cipher | Cipher algorithm to use. |
| key | Decryption key bytes, or NULL to set later. |
| iv | Initialization vector, or NULL when not yet required. |