Send a legacy control request to a digest context.

Synopsis

Declared in <openssl/evp.h>

int
EVP_MD_CTX_ctrl(
    EVP_MD_CTX* ctx,
    int cmd,
    int p1,
    void* p2);

Return Value

1 on success, or a command‐specific status / 0 on failure.

Parameters

Name

Description

ctx

Digest context to control.

cmd

Control command (algorithm‐specific).

p1

Integer control argument.

p2

Pointer control argument, or NULL.

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