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md5: Add support for calculating the md5 sum of buffers incrementally

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It is now possible to calculate the md5 sum as the stream of buffers
becomes known where as previously it was only possible to calculate the
md5 sum of a pre-prepared buffer.
This commit is contained in:
Gökhan Şengün 2012-03-30 23:09:47 +03:00 committed by Steve Holme
parent 33d044a862
commit 004d7251ab
2 changed files with 79 additions and 0 deletions
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29
lib/curl_md5.h
View File

@ -25,10 +25,39 @@
#ifndef CURL_DISABLE_CRYPTO_AUTH
#include "curl_hmac.h"
#define MD5_DIGEST_LEN 16
typedef void (* Curl_MD5_init_func)(void *context);
typedef void (* Curl_MD5_update_func)(void *context,
const unsigned char *data,
unsigned int len);
typedef void (* Curl_MD5_final_func)(unsigned char *result, void *context);
typedef struct {
Curl_MD5_init_func md5_init; /* Initialize context procedure */
Curl_MD5_update_func md5_update; /* Update context with data */
Curl_MD5_final_func md5_final; /* Get final result procedure */
unsigned int md5_ctxtsize; /* Context structure size */
unsigned int md5_resultlen; /* Result length (bytes) */
} MD5_params;
typedef struct {
const MD5_params *md5_hash; /* Hash function definition */
void *md5_hashctx; /* Hash function context */
} MD5_context;
extern const MD5_params Curl_DIGEST_MD5[1];
extern const HMAC_params Curl_HMAC_MD5[1];
void Curl_md5it(unsigned char *output,
const unsigned char *input);
MD5_context * Curl_MD5_init(const MD5_params *md5params);
int Curl_MD5_update(MD5_context *context,
const unsigned char *data,
unsigned int len);
int Curl_MD5_final(MD5_context *context, unsigned char *result);
#endif
#endif /* HEADER_CURL_MD5_H */

50
lib/md5.c
View File

@ -407,6 +407,15 @@ const HMAC_params Curl_HMAC_MD5[] = {
}
};
const MD5_params Curl_DIGEST_MD5[] = {
{
(Curl_MD5_init_func) MD5_Init, /* Digest initialization function */
(Curl_MD5_update_func) MD5_Update, /* Digest update function */
(Curl_MD5_final_func) MD5_Final, /* Digest computation end function */
sizeof(MD5_CTX), /* Size of digest context struct */
16 /* Result size */
}
};
void Curl_md5it(unsigned char *outbuffer, /* 16 bytes */
const unsigned char *input)
@ -417,4 +426,45 @@ void Curl_md5it(unsigned char *outbuffer, /* 16 bytes */
MD5_Final(outbuffer, &ctx);
}
MD5_context * Curl_MD5_init(const MD5_params *md5params)
{
MD5_context* ctxt;
/* Create MD5 context */
ctxt = malloc(sizeof *ctxt);
if(!ctxt)
return ctxt;
ctxt->md5_hashctx = malloc(md5params->md5_ctxtsize);
if(!ctxt->md5_hashctx)
return ctxt->md5_hashctx;
ctxt->md5_hash = md5params;
(*md5params->md5_init)(ctxt->md5_hashctx);
return ctxt;
}
int Curl_MD5_update(MD5_context *context,
const unsigned char *data,
unsigned int len)
{
(*context->md5_hash->md5_update)(context->md5_hashctx, data, len);
return 0;
}
int Curl_MD5_final(MD5_context *context, unsigned char *result)
{
(*context->md5_hash->md5_final)(result, context->md5_hashctx);
free(context->md5_hashctx);
free(context);
return 0;
}
#endif /* CURL_DISABLE_CRYPTO_AUTH */