include: Remove unimplemented HMAC declarations

Remove the HMAC declarations from the includes.  They are
not implemented nor used anywhere, and their presence breaks the build
on NetBSD that delivers an incompatible hmac() function in <stdlib.h>.

ASTERISK-29818

Change-Id: I0c4b88645e30174b1b63846a6b328625b69c2ea7

include/asterisk/sha1.h

@@ -294,63 +294,6 @@ extern int USHAHashSize(enum SHAversion whichSha);
 extern int USHAHashSizeBits(enum SHAversion whichSha);
 extern const char *USHAHashName(enum SHAversion whichSha);
 
-/*
- * HMAC Keyed-Hashing for Message Authentication, RFC 2104,
- * for all SHAs.
- * This interface allows a fixed-length text input to be used.
- */
-extern int hmac(SHAversion whichSha, /* which SHA algorithm to use */
-    const unsigned char *text,     /* pointer to data stream */
-    int text_len,                  /* length of data stream */
-    const unsigned char *key,      /* pointer to authentication key */
-    int key_len,                   /* length of authentication key */
-    uint8_t digest[USHAMaxHashSize]); /* caller digest to fill in */
-
-/*
- * HMAC Keyed-Hashing for Message Authentication, RFC 2104,
- * for all SHAs.
- * This interface allows any length of text input to be used.
- */
-extern int hmacReset(HMACContext *context, enum SHAversion whichSha,
-                     const unsigned char *key, int key_len);
-extern int hmacInput(HMACContext *context, const unsigned char *text,
-                     int text_len);
-extern int hmacFinalBits(HMACContext *context, uint8_t bits,
-                         unsigned int bit_count);
-extern int hmacResult(HMACContext *context,
-                      uint8_t digest[USHAMaxHashSize]);
-
-/*
- * HKDF HMAC-based Extract-and-Expand Key Derivation Function,
- * RFC 5869, for all SHAs.
- */
-extern int hkdf(SHAversion whichSha, const unsigned char *salt,
-                int salt_len, const unsigned char *ikm, int ikm_len,
-                const unsigned char *info, int info_len,
-                uint8_t okm[ ], int okm_len);
-extern int hkdfExtract(SHAversion whichSha, const unsigned char *salt,
-                       int salt_len, const unsigned char *ikm,
-                       int ikm_len, uint8_t prk[USHAMaxHashSize]);
-extern int hkdfExpand(SHAversion whichSha, const uint8_t prk[ ],
-                      int prk_len, const unsigned char *info,
-                      int info_len, uint8_t okm[ ], int okm_len);
-
-/*
- * HKDF HMAC-based Extract-and-Expand Key Derivation Function,
- * RFC 5869, for all SHAs.
- * This interface allows any length of text input to be used.
- */
-extern int hkdfReset(HKDFContext *context, enum SHAversion whichSha,
-                     const unsigned char *salt, int salt_len);
-extern int hkdfInput(HKDFContext *context, const unsigned char *ikm,
-                     int ikm_len);
-extern int hkdfFinalBits(HKDFContext *context, uint8_t ikm_bits,
-                         unsigned int ikm_bit_count);
-extern int hkdfResult(HKDFContext *context,
-                      uint8_t prk[USHAMaxHashSize],
-                      const unsigned char *info, int info_len,
-                      uint8_t okm[USHAMaxHashSize], int okm_len);
-
 /************************ sha-private.h ************************/
 /***************** See RFC 6234 for details. *******************/
 /*