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Helper functions to perform our truncated base64 encoding on hexdigests.

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svn:r5087
This commit is contained in:
Nick Mathewson 2005-09-18 02:18:59 +00:00
parent 312af36126
commit f8a80e8d59
2 changed files with 31 additions and 0 deletions
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25
src/common/crypto.c
View File

@ -1688,6 +1688,31 @@ base64_decode(char *dest, size_t destlen, const char *src, size_t srclen)
return ret;
}
int
digest_to_base64(char *d64, const char *digest)
{
char buf[256];
base64_encode(buf, sizeof(buf), digest, DIGEST_LEN);
buf[BASE64_DIGEST_LEN] = '\0';
memcpy(d64, buf, BASE64_DIGEST_LEN+1);
return 0;
}
int
digest_from_base64(char *digest, const char *d64)
{
char buf_in[BASE64_DIGEST_LEN+3];
char buf[256];
if (strlen(d64) != BASE64_DIGEST_LEN)
return -1;
memcpy(buf_in, d64, BASE64_DIGEST_LEN);
memcpy(buf_in+BASE64_DIGEST_LEN, "=\n\0", 3);
if (base64_decode(buf, sizeof(buf), buf_in, strlen(buf_in)) != DIGEST_LEN)
return -1;
memcpy(digest, buf, DIGEST_LEN);
return 0;
}
/** Implements base32 encoding as in rfc3548. Limitation: Requires
* that srclen*8 is a multiple of 5.
*/

6
src/common/crypto.h
View File

@ -24,6 +24,9 @@
/** Length of our DH keys. */
#define DH_BYTES (1024/8)
/* DOCDOC */
#define BASE64_DIGEST_LEN 27
/** Constants used to indicate no padding for public-key encryption */
#define PK_NO_PADDING 60000
/** Constants used to indicate PKCS1 padding for public-key encryption */
@ -155,6 +158,9 @@ int base64_decode(char *dest, size_t destlen, const char *src, size_t srclen);
#define BASE32_CHARS "abcdefghijklmnopqrstuvwxyz234567"
void base32_encode(char *dest, size_t destlen, const char *src, size_t srclen);
int digest_to_base64(char *d64, const char *digest);
int digest_from_base64(char *digest, const char *d64);
#define S2K_SPECIFIER_LEN 9
void secret_to_key(char *key_out, size_t key_out_len, const char *secret,
size_t secret_len, const char *s2k_specifier);