diff options
-rw-r--r-- | ChangeLog | 6 | ||||
-rw-r--r-- | key.c | 152 | ||||
-rw-r--r-- | key.h | 11 |
3 files changed, 147 insertions, 22 deletions
@@ -3,6 +3,10 @@ - markus@cvs.openbsd.org 2001/03/11 13:25:36 [auth2.c key.c] debug + - jakob@cvs.openbsd.org 2001/03/11 15:03:16 + [key.c key.h] + add improved fingerprint functions. based on work by Carsten + Raskgaard <cara@int.tele.dk> and modified by me. ok markus@. 20010311 - OpenBSD CVS Sync @@ -4496,4 +4500,4 @@ - Wrote replacements for strlcpy and mkdtemp - Released 1.0pre1 -$Id: ChangeLog,v 1.940 2001/03/11 20:01:55 mouring Exp $ +$Id: ChangeLog,v 1.941 2001/03/11 20:03:44 mouring Exp $ @@ -32,7 +32,7 @@ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "includes.h" -RCSID("$OpenBSD: key.c,v 1.18 2001/03/11 13:25:36 markus Exp $"); +RCSID("$OpenBSD: key.c,v 1.19 2001/03/11 15:03:15 jakob Exp $"); #include <openssl/evp.h> @@ -153,19 +153,16 @@ key_equal(Key *a, Key *b) return 0; } -/* - * Generate key fingerprint in ascii format. - * Based on ideas and code from Bjoern Groenvall <bg@sics.se> - */ -char * -key_fingerprint(Key *k) +u_char* +key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length) { - static char retval[(EVP_MAX_MD_SIZE+1)*3]; u_char *blob = NULL; + u_char *retval = NULL; int len = 0; int nlen, elen; - retval[0] = '\0'; + *dgst_raw_length = 0; + switch (k->type) { case KEY_RSA1: nlen = BN_num_bytes(k->rsa->n); @@ -183,29 +180,144 @@ key_fingerprint(Key *k) return retval; break; default: - fatal("key_fingerprint: bad key type %d", k->type); + fatal("key_fingerprint_raw: bad key type %d", k->type); break; } if (blob != NULL) { - int i; - u_char digest[EVP_MAX_MD_SIZE]; - EVP_MD *md = EVP_md5(); + EVP_MD *md = NULL; EVP_MD_CTX ctx; + + retval = xmalloc(EVP_MAX_MD_SIZE); + + switch (dgst_type) { + case SSH_FP_MD5: + md = EVP_md5(); + break; + case SSH_FP_SHA1: + md = EVP_sha1(); + break; + default: + fatal("key_fingerprint_raw: bad digest type %d", + dgst_type); + } + EVP_DigestInit(&ctx, md); EVP_DigestUpdate(&ctx, blob, len); - EVP_DigestFinal(&ctx, digest, NULL); - for(i = 0; i < md->md_size; i++) { - char hex[4]; - snprintf(hex, sizeof(hex), "%02x:", digest[i]); - strlcat(retval, hex, sizeof(retval)); - } - retval[strlen(retval) - 1] = '\0'; + EVP_DigestFinal(&ctx, retval, NULL); + *dgst_raw_length = md->md_size; memset(blob, 0, len); xfree(blob); + } else { + fatal("key_fingerprint_raw: blob is null"); } return retval; } +char* +key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) +{ + char *retval; + int i; + + retval = xmalloc(dgst_raw_len * 3); + retval[0] = '\0'; + for(i = 0; i < dgst_raw_len; i++) { + char hex[4]; + snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); + strlcat(retval, hex, dgst_raw_len * 3); + } + retval[(dgst_raw_len * 3) - 1] = '\0'; + return retval; +} + +char* +key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) +{ + char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; + char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', + 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; + u_int rounds, idx, retval_idx, seed; + char *retval; + + rounds = (dgst_raw_len / 2) + 1; + retval = xmalloc(sizeof(char) * (rounds*6)); + seed = 1; + retval_idx = 0; + retval[retval_idx++] = 'x'; + for (idx=0;idx<rounds;idx++) { + u_int idx0, idx1, idx2, idx3, idx4; + if ((idx + 1 < rounds) || (dgst_raw_len % 2 != 0)) { + idx0 = (((((u_int)(dgst_raw[2 * idx])) >> 6) & 3) + + seed) % 6; + idx1 = (((u_int)(dgst_raw[2 * idx])) >> 2) & 15; + idx2 = ((((u_int)(dgst_raw[2 * idx])) & 3) + + (seed / 6)) % 6; + retval[retval_idx++] = vowels[idx0]; + retval[retval_idx++] = consonants[idx1]; + retval[retval_idx++] = vowels[idx2]; + if ((idx + 1) < rounds) { + idx3 = (((u_int)(dgst_raw[(2 * idx) + 1])) >> 4) & 15; + idx4 = (((u_int)(dgst_raw[(2 * idx) + 1]))) & 15; + retval[retval_idx++] = consonants[idx3]; + retval[retval_idx++] = '-'; + retval[retval_idx++] = consonants[idx4]; + seed = ((seed * 5) + + ((((u_int)(dgst_raw[2 * idx])) * 7) + + ((u_int)(dgst_raw[(2 * idx) + 1])))) % 36; + } + } else { + idx0 = seed % 6; + idx1 = 16; + idx2 = seed / 6; + retval[retval_idx++] = vowels[idx0]; + retval[retval_idx++] = consonants[idx1]; + retval[retval_idx++] = vowels[idx2]; + } + } + retval[retval_idx++] = 'x'; + retval[retval_idx++] = '\0'; + return retval; +} + +char* +key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) +{ + char *retval = NULL; + u_char *dgst_raw; + size_t dgst_raw_len; + + dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); + if (!dgst_raw) + fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()"); + switch(dgst_rep) { + case SSH_FP_HEX: + retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); + break; + case SSH_FP_BUBBLEBABBLE: + retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); + break; + default: + fatal("key_fingerprint_ex: bad digest representation %d", + dgst_rep); + break; + } + memset(dgst_raw, 0, dgst_raw_len); + xfree(dgst_raw); + return retval; +} + +char * +key_fingerprint(Key *k) +{ + static char retval[(EVP_MAX_MD_SIZE + 1) * 3]; + char *digest; + + digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX); + strlcpy(retval, digest, sizeof(retval)); + xfree(digest); + return retval; +} + /* * Reads a multiple-precision integer in decimal from the buffer, and advances * the pointer. The integer must already be initialized. This function is @@ -1,4 +1,4 @@ -/* $OpenBSD: key.h,v 1.9 2001/01/29 01:58:16 niklas Exp $ */ +/* $OpenBSD: key.h,v 1.10 2001/03/11 15:03:16 jakob Exp $ */ /* * Copyright (c) 2000 Markus Friedl. All rights reserved. @@ -36,6 +36,14 @@ enum types { KEY_DSA, KEY_UNSPEC }; +enum fp_type { + SSH_FP_SHA1, + SSH_FP_MD5 +}; +enum fp_rep { + SSH_FP_HEX, + SSH_FP_BUBBLEBABBLE +}; struct Key { int type; RSA *rsa; @@ -46,6 +54,7 @@ Key *key_new(int type); Key *key_new_private(int type); void key_free(Key *k); int key_equal(Key *a, Key *b); +char *key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep); char *key_fingerprint(Key *k); char *key_type(Key *k); int key_write(Key *key, FILE *f); |