Provide support for enctype aliases for ease of use.

This should be compatible with MIT krb5 at least from my memory.

lib/krb5/crypto-aes.c

@@ -142,6 +142,7 @@ AES_PRF(krb5_context context,
 struct _krb5_encryption_type _krb5_enctype_aes128_cts_hmac_sha1 = {
     ETYPE_AES128_CTS_HMAC_SHA1_96,
     "aes128-cts-hmac-sha1-96",
+    "aes128-cts",
     16,
     1,
     16,
@@ -157,6 +158,7 @@ struct _krb5_encryption_type _krb5_enctype_aes128_cts_hmac_sha1 = {
 struct _krb5_encryption_type _krb5_enctype_aes256_cts_hmac_sha1 = {
     ETYPE_AES256_CTS_HMAC_SHA1_96,
     "aes256-cts-hmac-sha1-96",
+    "aes256-cts",
     16,
     1,
     16,

lib/krb5/crypto-arcfour.c

@@ -312,6 +312,7 @@ ARCFOUR_encrypt(krb5_context context,
 struct _krb5_encryption_type _krb5_enctype_arcfour_hmac_md5 = {
     ETYPE_ARCFOUR_HMAC_MD5,
     "arcfour-hmac-md5",
+    "rc4-hmac",
     1,
     1,
     8,

lib/krb5/crypto-des.c

@@ -288,6 +288,7 @@ DES_PCBC_encrypt_key_ivec(krb5_context context,
 struct _krb5_encryption_type _krb5_enctype_des_cbc_crc = {
     ETYPE_DES_CBC_CRC,
     "des-cbc-crc",
+    NULL,
     8,
     8,
     8,
@@ -303,6 +304,7 @@ struct _krb5_encryption_type _krb5_enctype_des_cbc_crc = {
 struct _krb5_encryption_type _krb5_enctype_des_cbc_md4 = {
     ETYPE_DES_CBC_MD4,
     "des-cbc-md4",
+    NULL,
     8,
     8,
     8,
@@ -318,6 +320,7 @@ struct _krb5_encryption_type _krb5_enctype_des_cbc_md4 = {
 struct _krb5_encryption_type _krb5_enctype_des_cbc_md5 = {
     ETYPE_DES_CBC_MD5,
     "des-cbc-md5",
+    NULL,
     8,
     8,
     8,
@@ -333,6 +336,7 @@ struct _krb5_encryption_type _krb5_enctype_des_cbc_md5 = {
 struct _krb5_encryption_type _krb5_enctype_des_cbc_none = {
     ETYPE_DES_CBC_NONE,
     "des-cbc-none",
+    NULL,
     8,
     8,
     0,
@@ -348,6 +352,7 @@ struct _krb5_encryption_type _krb5_enctype_des_cbc_none = {
 struct _krb5_encryption_type _krb5_enctype_des_cfb64_none = {
     ETYPE_DES_CFB64_NONE,
     "des-cfb64-none",
+    NULL,
     1,
     1,
     0,
@@ -363,6 +368,7 @@ struct _krb5_encryption_type _krb5_enctype_des_cfb64_none = {
 struct _krb5_encryption_type _krb5_enctype_des_pcbc_none = {
     ETYPE_DES_PCBC_NONE,
     "des-pcbc-none",
+    NULL,
     8,
     8,
     0,

lib/krb5/crypto-des3.c

@@ -131,6 +131,7 @@ struct _krb5_checksum_type _krb5_checksum_hmac_sha1_des3 = {
 struct _krb5_encryption_type _krb5_enctype_des3_cbc_md5 = {
     ETYPE_DES3_CBC_MD5,
     "des3-cbc-md5",
+    NULL,
     8,
     8,
     8,
@@ -147,6 +148,7 @@ struct _krb5_encryption_type _krb5_enctype_des3_cbc_md5 = {
 struct _krb5_encryption_type _krb5_enctype_des3_cbc_sha1 = {
     ETYPE_DES3_CBC_SHA1,
     "des3-cbc-sha1",
+    NULL,
     8,
     8,
     8,
@@ -163,6 +165,7 @@ struct _krb5_encryption_type _krb5_enctype_des3_cbc_sha1 = {
 struct _krb5_encryption_type _krb5_enctype_old_des3_cbc_sha1 = {
     ETYPE_OLD_DES3_CBC_SHA1,
     "old-des3-cbc-sha1",
+    NULL,
     8,
     8,
     8,
@@ -179,6 +182,7 @@ struct _krb5_encryption_type _krb5_enctype_old_des3_cbc_sha1 = {
 struct _krb5_encryption_type _krb5_enctype_des3_cbc_none = {
     ETYPE_DES3_CBC_NONE,
     "des3-cbc-none",
+    NULL,
     8,
     8,
     0,

lib/krb5/crypto-null.c

@@ -87,6 +87,7 @@ NULL_encrypt(krb5_context context,
 struct _krb5_encryption_type _krb5_enctype_null = {
     ETYPE_NULL,
     "null",
+    NULL,
     1,
     1,
     0,

lib/krb5/crypto.c

@@ -679,11 +679,17 @@ krb5_string_to_enctype(krb5_context context,
 		       krb5_enctype *etype)
 {
     int i;
-    for(i = 0; i < _krb5_num_etypes; i++)
+    for(i = 0; i < _krb5_num_etypes; i++) {
 	if(strcasecmp(_krb5_etypes[i]->name, string) == 0){
 	    *etype = _krb5_etypes[i]->type;
 	    return 0;
 	}
+	if(_krb5_etypes[i]->alias != NULL &&
+	   strcasecmp(_krb5_etypes[i]->alias, string) == 0){
+	    *etype = _krb5_etypes[i]->type;
+	    return 0;
+	}
+    }
     krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
 			    N_("encryption type %s not supported", ""),
 			    string);

lib/krb5/crypto.h

@@ -103,6 +103,7 @@ struct _krb5_checksum_type {
 struct _krb5_encryption_type {
     krb5_enctype type;
     const char *name;
+    const char *alias;
     size_t blocksize;
     size_t padsize;
     size_t confoundersize;