[PATCH 07/12] pack-check: convert various uses of SHA-1 to abstract forms

[brian m. carlson]

Convert various explicit calls to use SHA-1 functions and constants to
references to the_hash_algo.  Make several strings more generic with
respect to the hash algorithm used.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 pack-check.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/pack-check.c b/pack-check.c
index 073c1fbd46..403a572567 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -41,7 +41,7 @@ int check_pack_crc(struct packed_git *p, struct pack_window 
**w_curs,
        } while (len);
 
        index_crc = p->index_data;
-       index_crc += 2 + 256 + p->num_objects * (20/4) + nr;
+       index_crc += 2 + 256 + p->num_objects * (the_hash_algo->rawsz/4) + nr;
 
        return data_crc != ntohl(*index_crc);
 }
@@ -54,7 +54,7 @@ static int verify_packfile(struct packed_git *p,
 {
        off_t index_size = p->index_size;
        const unsigned char *index_base = p->index_data;
-       git_SHA_CTX ctx;
+       git_hash_ctx ctx;
        unsigned char hash[GIT_MAX_RAWSZ], *pack_sig;
        off_t offset = 0, pack_sig_ofs = 0;
        uint32_t nr_objects, i;
@@ -64,24 +64,24 @@ static int verify_packfile(struct packed_git *p,
        if (!is_pack_valid(p))
                return error("packfile %s cannot be accessed", p->pack_name);
 
-       git_SHA1_Init(&ctx);
+       the_hash_algo->init_fn(&ctx);
        do {
                unsigned long remaining;
                unsigned char *in = use_pack(p, w_curs, offset, &remaining);
                offset += remaining;
                if (!pack_sig_ofs)
-                       pack_sig_ofs = p->pack_size - 20;
+                       pack_sig_ofs = p->pack_size - the_hash_algo->rawsz;
                if (offset > pack_sig_ofs)
                        remaining -= (unsigned int)(offset - pack_sig_ofs);
-               git_SHA1_Update(&ctx, in, remaining);
+               the_hash_algo->update_fn(&ctx, in, remaining);
        } while (offset < pack_sig_ofs);
-       git_SHA1_Final(hash, &ctx);
+       the_hash_algo->final_fn(hash, &ctx);
        pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
        if (hashcmp(hash, pack_sig))
-               err = error("%s SHA1 checksum mismatch",
+               err = error("%s pack checksum mismatch",
                            p->pack_name);
-       if (hashcmp(index_base + index_size - 40, pack_sig))
-               err = error("%s SHA1 does not match its index",
+       if (hashcmp(index_base + index_size - the_hash_algo->hexsz, pack_sig))
+               err = error("%s pack checksum does not match its index",
                            p->pack_name);
        unuse_pack(w_curs);
 
@@ -165,8 +165,8 @@ int verify_pack_index(struct packed_git *p)
 {
        off_t index_size;
        const unsigned char *index_base;
-       git_SHA_CTX ctx;
-       unsigned char sha1[20];
+       git_hash_ctx ctx;
+       unsigned char hash[GIT_MAX_RAWSZ];
        int err = 0;
 
        if (open_pack_index(p))
@@ -175,11 +175,11 @@ int verify_pack_index(struct packed_git *p)
        index_base = p->index_data;
 
        /* Verify SHA1 sum of the index file */
-       git_SHA1_Init(&ctx);
-       git_SHA1_Update(&ctx, index_base, (unsigned int)(index_size - 20));
-       git_SHA1_Final(sha1, &ctx);
-       if (hashcmp(sha1, index_base + index_size - 20))
-               err = error("Packfile index for %s SHA1 mismatch",
+       the_hash_algo->init_fn(&ctx);
+       the_hash_algo->update_fn(&ctx, index_base, (unsigned int)(index_size - 
the_hash_algo->rawsz));
+       the_hash_algo->final_fn(hash, &ctx);
+       if (hashcmp(hash, index_base + index_size - the_hash_algo->rawsz))
+               err = error("Packfile index for %s hash mismatch",
                            p->pack_name);
        return err;
 }