Function mbedtls_pkcs7_signed_hash_verify 

pub unsafe extern "C" fn mbedtls_pkcs7_signed_hash_verify(
    pkcs7: *mut mbedtls_pkcs7,
    cert: *const mbedtls_x509_crt,
    hash: *const c_uchar,
    hashlen: usize,
) -> c_int

\brief Verification of PKCS #7 signature against a caller-supplied certificate.

            For each signer in the PKCS structure, this function
            validates a signature over the supplied hash, using the
            supplied certificate and the same digest algorithm as
            specified by the signer. Verification succeeds if any
            signature is good.

            This function does not use the certificates held within the
            PKCS #7 structure itself, and does not check that the
            certificate is signed by a trusted certification authority.

\param pkcs7 PKCS #7 structure containing signature. \param cert Certificate containing key to verify signature. \param hash Hash of the plain data on which signature has to be verified. \param hashlen Length of the hash.

\note This function is different from mbedtls_pkcs7_signed_data_verify() in that it is directly passed the hash of the data.

\return 0 if the signature verifies, or a negative error code on failure.