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Function added to convert a hash algorithm to an HMAC integrity algorithm

This commit is contained in:
Tobias Brunner 2013-04-11 19:41:48 +02:00
parent 047fca1169
commit 199fdcadae
2 changed files with 77 additions and 0 deletions
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66
src/libstrongswan/crypto/hashers/hasher.c
View File

@ -177,6 +177,72 @@ hash_algorithm_t hasher_algorithm_from_integrity(integrity_algorithm_t alg,
return HASH_UNKNOWN;
}
/*
* Described in header.
*/
integrity_algorithm_t hasher_algorithm_to_integrity(hash_algorithm_t alg,
size_t length)
{
switch (alg)
{
case HASH_MD5:
switch (length)
{
case 12:
return AUTH_HMAC_MD5_96;
case 16:
return AUTH_HMAC_MD5_128;
}
break;
case HASH_SHA1:
case HASH_PREFERRED:
switch (length)
{
case 12:
return AUTH_HMAC_SHA1_96;
case 16:
return AUTH_HMAC_SHA1_128;
case 20:
return AUTH_HMAC_SHA1_160;
}
break;
case HASH_SHA256:
switch (length)
{
case 12:
return AUTH_HMAC_SHA2_256_96;
case 16:
return AUTH_HMAC_SHA2_256_128;
case 32:
return AUTH_HMAC_SHA2_256_256;
}
break;
case HASH_SHA384:
switch (length)
{
case 24:
return AUTH_HMAC_SHA2_384_192;
case 48:
return AUTH_HMAC_SHA2_384_384;
}
break;
case HASH_SHA512:
switch (length)
{
case 32:
return AUTH_HMAC_SHA2_512_256;
}
break;
case HASH_MD2:
case HASH_MD4:
case HASH_SHA224:
case HASH_UNKNOWN:
break;
}
return AUTH_UNDEFINED;
}
/*
* Described in header.
*/

11
src/libstrongswan/crypto/hashers/hasher.h
View File

@ -153,6 +153,17 @@ hash_algorithm_t hasher_algorithm_from_prf(pseudo_random_function_t alg);
hash_algorithm_t hasher_algorithm_from_integrity(integrity_algorithm_t alg,
size_t *length);
/**
* Conversion of hash algorithm to integrity algorithm (if based on a hash).
*
* @param alg hash algorithm
* @param length length of the signature
* @return integrity algorithm, AUTH_UNDEFINED if none is known
* based on the given hash function
*/
integrity_algorithm_t hasher_algorithm_to_integrity(hash_algorithm_t alg,
size_t length);
/**
* Conversion of hash algorithm into ASN.1 OID.
*