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Add "check_sha1_signature()" helper function 

And fix up header declarations.
maint
Linus Torvalds 2005-04-08 15:01:15 -07:00
parent 24778e335a
commit 2ade934026
2 changed files with 12 additions and 0 deletions
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1
cache.h
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@ -82,6 +82,7 @@ extern int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size);

/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern void * map_sha1_file(unsigned char *sha1, unsigned long *size);
extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
extern void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size);
extern int write_sha1_file(char *buf, unsigned len);
extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size);

11
read-cache.c
View File

@ -84,6 +84,17 @@ char *sha1_file_name(unsigned char *sha1)
return base;
}

int check_sha1_signature(unsigned char *sha1, void *map, unsigned long size)
{
unsigned char real_sha1[20];
SHA_CTX c;

SHA1_Init(&c);
SHA1_Update(&c, map, size);
SHA1_Final(real_sha1, &c);
return memcmp(sha1, real_sha1, 20) ? -1 : 0;
}

void *map_sha1_file(unsigned char *sha1, unsigned long *size)
{
char *filename = sha1_file_name(sha1);