/usr/include/pppd/sha1.h is in ppp-dev 2.4.5-5.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | /* sha1.h */
/* If OpenSSL is in use, then use that version of SHA-1 */
#ifdef OPENSSL
#include <t_sha.h>
#define __SHA1_INCLUDE_
#endif
#ifndef __SHA1_INCLUDE_
#ifndef SHA1_SIGNATURE_SIZE
#ifdef SHA_DIGESTSIZE
#define SHA1_SIGNATURE_SIZE SHA_DIGESTSIZE
#else
#define SHA1_SIGNATURE_SIZE 20
#endif
#endif
typedef struct {
u_int32_t state[5];
u_int32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
extern void SHA1_Init(SHA1_CTX *);
extern void SHA1_Update(SHA1_CTX *, const unsigned char *, unsigned int);
extern void SHA1_Final(unsigned char[SHA1_SIGNATURE_SIZE], SHA1_CTX *);
#define __SHA1_INCLUDE_
#endif /* __SHA1_INCLUDE_ */
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