Decrypt CS1 ciphertext stealing using a CBC decrypt function.

Synopsis

Declared in <openssl/modes.h>

size_t
CRYPTO_cts128_decrypt(
    unsigned char const* in,
    unsigned char* out,
    size_t len,
    void const* key,
    unsigned char ivec[],
    cbc128_f cbc);

Return Value

Number of plaintext bytes written, or 0 on error.

Parameters

Name

Description

in

Input ciphertext of length len (must be greater than 16).

out

Output plaintext buffer of length len.

len

Number of ciphertext bytes.

key

Cipher‐specific expanded key for cbc.

ivec

16‐byte IV updated like CBC.

cbc

CBC‐mode decrypt function for the underlying cipher.

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