This file is indexed.

/usr/include/wolfssl/openssl/ed25519.h is in libwolfssl-dev 3.13.0+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* ed25519.h */

#ifndef WOLFSSL_ED25519_H_
#define WOLFSSL_ED25519_H_

#ifdef __cplusplus
extern "C" {
#endif

WOLFSSL_API
int wolfSSL_ED25519_generate_key(unsigned char *priv, unsigned int *privSz,
                                 unsigned char *pub, unsigned int *pubSz);
WOLFSSL_API
int wolfSSL_ED25519_sign(const unsigned char *msg, unsigned int msgSz,
                         const unsigned char *priv, unsigned int privSz,
                         unsigned char *sig, unsigned int *sigSz);
WOLFSSL_API
int wolfSSL_ED25519_verify(const unsigned char *msg, unsigned int msgSz,
                           const unsigned char *pub, unsigned int pubSz,
                           const unsigned char *sig, unsigned int sigSz);

#ifdef __cplusplus
}  /* extern "C" */
#endif

#endif /* header */