version 1.62, 2002/11/21 22:45:31 |
version 1.62.2.2, 2004/03/04 18:18:15 |
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#include <openssl/md5.h> |
#include <openssl/md5.h> |
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#if OPENSSL_VERSION_NUMBER < 0x00907000L |
#if OPENSSL_VERSION_NUMBER < 0x00907000L |
#include "rijndael.h" |
extern const EVP_CIPHER *evp_rijndael(void); |
static const EVP_CIPHER *evp_rijndael(void); |
extern void ssh_rijndael_iv(EVP_CIPHER_CTX *, int, u_char *, u_int); |
#endif |
#endif |
static const EVP_CIPHER *evp_ssh1_3des(void); |
extern const EVP_CIPHER *evp_ssh1_bf(void); |
static const EVP_CIPHER *evp_ssh1_bf(void); |
extern const EVP_CIPHER *evp_ssh1_3des(void); |
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extern void ssh1_3des_iv(EVP_CIPHER_CTX *, int, u_char *, int); |
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extern const EVP_CIPHER *evp_aes_128_ctr(void); |
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extern void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, int, u_char *, u_int); |
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#define EVP_acss NULL |
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struct Cipher { |
struct Cipher { |
char *name; |
char *name; |
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{ "rijndael-cbc@lysator.liu.se", |
{ "rijndael-cbc@lysator.liu.se", |
SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, |
SSH_CIPHER_SSH2, 16, 32, EVP_aes_256_cbc }, |
#endif |
#endif |
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{ "aes128-ctr", SSH_CIPHER_SSH2, 16, 16, evp_aes_128_ctr }, |
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{ "aes192-ctr", SSH_CIPHER_SSH2, 16, 24, evp_aes_128_ctr }, |
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{ "aes256-ctr", SSH_CIPHER_SSH2, 16, 32, evp_aes_128_ctr }, |
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{ "acss@openssh.org", SSH_CIPHER_SSH2, 16, 5, EVP_acss }, |
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{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } |
{ NULL, SSH_CIPHER_ILLEGAL, 0, 0, NULL } |
}; |
}; |
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/*--*/ |
/*--*/ |
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u_int |
u_int |
cipher_blocksize(Cipher *c) |
cipher_blocksize(const Cipher *c) |
{ |
{ |
return (c->block_size); |
return (c->block_size); |
} |
} |
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u_int |
u_int |
cipher_keylen(Cipher *c) |
cipher_keylen(const Cipher *c) |
{ |
{ |
return (c->key_len); |
return (c->key_len); |
} |
} |
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u_int |
u_int |
cipher_get_number(Cipher *c) |
cipher_get_number(const Cipher *c) |
{ |
{ |
return (c->number); |
return (c->number); |
} |
} |
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memset(&md, 0, sizeof(md)); |
memset(&md, 0, sizeof(md)); |
} |
} |
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/* Implementations for other non-EVP ciphers */ |
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/* |
/* |
* This is used by SSH1: |
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* |
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* What kind of triple DES are these 2 routines? |
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* |
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* Why is there a redundant initialization vector? |
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* |
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* If only iv3 was used, then, this would till effect have been |
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* outer-cbc. However, there is also a private iv1 == iv2 which |
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* perhaps makes differential analysis easier. On the other hand, the |
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* private iv1 probably makes the CRC-32 attack ineffective. This is a |
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* result of that there is no longer any known iv1 to use when |
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* choosing the X block. |
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*/ |
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struct ssh1_3des_ctx |
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{ |
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EVP_CIPHER_CTX k1, k2, k3; |
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}; |
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static int |
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ssh1_3des_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, |
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int enc) |
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{ |
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struct ssh1_3des_ctx *c; |
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u_char *k1, *k2, *k3; |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { |
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c = xmalloc(sizeof(*c)); |
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EVP_CIPHER_CTX_set_app_data(ctx, c); |
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} |
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if (key == NULL) |
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return (1); |
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if (enc == -1) |
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enc = ctx->encrypt; |
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k1 = k2 = k3 = (u_char *) key; |
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k2 += 8; |
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if (EVP_CIPHER_CTX_key_length(ctx) >= 16+8) { |
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if (enc) |
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k3 += 16; |
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else |
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k1 += 16; |
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} |
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EVP_CIPHER_CTX_init(&c->k1); |
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EVP_CIPHER_CTX_init(&c->k2); |
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EVP_CIPHER_CTX_init(&c->k3); |
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if (EVP_CipherInit(&c->k1, EVP_des_cbc(), k1, NULL, enc) == 0 || |
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EVP_CipherInit(&c->k2, EVP_des_cbc(), k2, NULL, !enc) == 0 || |
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EVP_CipherInit(&c->k3, EVP_des_cbc(), k3, NULL, enc) == 0) { |
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memset(c, 0, sizeof(*c)); |
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xfree(c); |
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EVP_CIPHER_CTX_set_app_data(ctx, NULL); |
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return (0); |
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} |
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return (1); |
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} |
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static int |
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ssh1_3des_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, u_int len) |
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{ |
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struct ssh1_3des_ctx *c; |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { |
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error("ssh1_3des_cbc: no context"); |
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return (0); |
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} |
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if (EVP_Cipher(&c->k1, dest, (u_char *)src, len) == 0 || |
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EVP_Cipher(&c->k2, dest, dest, len) == 0 || |
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EVP_Cipher(&c->k3, dest, dest, len) == 0) |
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return (0); |
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return (1); |
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} |
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static int |
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ssh1_3des_cleanup(EVP_CIPHER_CTX *ctx) |
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{ |
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struct ssh1_3des_ctx *c; |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { |
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memset(c, 0, sizeof(*c)); |
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xfree(c); |
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EVP_CIPHER_CTX_set_app_data(ctx, NULL); |
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} |
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return (1); |
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} |
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static const EVP_CIPHER * |
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evp_ssh1_3des(void) |
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{ |
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static EVP_CIPHER ssh1_3des; |
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memset(&ssh1_3des, 0, sizeof(EVP_CIPHER)); |
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ssh1_3des.nid = NID_undef; |
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ssh1_3des.block_size = 8; |
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ssh1_3des.iv_len = 0; |
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ssh1_3des.key_len = 16; |
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ssh1_3des.init = ssh1_3des_init; |
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ssh1_3des.cleanup = ssh1_3des_cleanup; |
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ssh1_3des.do_cipher = ssh1_3des_cbc; |
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ssh1_3des.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH; |
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return (&ssh1_3des); |
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} |
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/* |
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* SSH1 uses a variation on Blowfish, all bytes must be swapped before |
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* and after encryption/decryption. Thus the swap_bytes stuff (yuk). |
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*/ |
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static void |
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swap_bytes(const u_char *src, u_char *dst, int n) |
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{ |
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u_char c[4]; |
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/* Process 4 bytes every lap. */ |
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for (n = n / 4; n > 0; n--) { |
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c[3] = *src++; |
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c[2] = *src++; |
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c[1] = *src++; |
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c[0] = *src++; |
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*dst++ = c[0]; |
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*dst++ = c[1]; |
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*dst++ = c[2]; |
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*dst++ = c[3]; |
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} |
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} |
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static int (*orig_bf)(EVP_CIPHER_CTX *, u_char *, const u_char *, u_int) = NULL; |
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static int |
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bf_ssh1_cipher(EVP_CIPHER_CTX *ctx, u_char *out, const u_char *in, u_int len) |
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{ |
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int ret; |
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swap_bytes(in, out, len); |
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ret = (*orig_bf)(ctx, out, out, len); |
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swap_bytes(out, out, len); |
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return (ret); |
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} |
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static const EVP_CIPHER * |
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evp_ssh1_bf(void) |
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{ |
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static EVP_CIPHER ssh1_bf; |
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memcpy(&ssh1_bf, EVP_bf_cbc(), sizeof(EVP_CIPHER)); |
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orig_bf = ssh1_bf.do_cipher; |
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ssh1_bf.nid = NID_undef; |
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ssh1_bf.do_cipher = bf_ssh1_cipher; |
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ssh1_bf.key_len = 32; |
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return (&ssh1_bf); |
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} |
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#if OPENSSL_VERSION_NUMBER < 0x00907000L |
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/* RIJNDAEL */ |
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#define RIJNDAEL_BLOCKSIZE 16 |
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struct ssh_rijndael_ctx |
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{ |
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rijndael_ctx r_ctx; |
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u_char r_iv[RIJNDAEL_BLOCKSIZE]; |
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}; |
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static int |
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ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv, |
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int enc) |
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{ |
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struct ssh_rijndael_ctx *c; |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { |
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c = xmalloc(sizeof(*c)); |
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EVP_CIPHER_CTX_set_app_data(ctx, c); |
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} |
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if (key != NULL) { |
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if (enc == -1) |
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enc = ctx->encrypt; |
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rijndael_set_key(&c->r_ctx, (u_char *)key, |
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8*EVP_CIPHER_CTX_key_length(ctx), enc); |
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} |
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if (iv != NULL) |
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memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE); |
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return (1); |
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} |
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static int |
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ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src, |
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u_int len) |
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{ |
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struct ssh_rijndael_ctx *c; |
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u_char buf[RIJNDAEL_BLOCKSIZE]; |
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u_char *cprev, *cnow, *plain, *ivp; |
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int i, j, blocks = len / RIJNDAEL_BLOCKSIZE; |
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if (len == 0) |
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return (1); |
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if (len % RIJNDAEL_BLOCKSIZE) |
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fatal("ssh_rijndael_cbc: bad len %d", len); |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) { |
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error("ssh_rijndael_cbc: no context"); |
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return (0); |
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} |
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if (ctx->encrypt) { |
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cnow = dest; |
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plain = (u_char *)src; |
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cprev = c->r_iv; |
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for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE, |
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cnow+=RIJNDAEL_BLOCKSIZE) { |
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for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) |
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buf[j] = plain[j] ^ cprev[j]; |
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rijndael_encrypt(&c->r_ctx, buf, cnow); |
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cprev = cnow; |
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} |
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memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE); |
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} else { |
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cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE); |
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plain = dest+len-RIJNDAEL_BLOCKSIZE; |
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memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE); |
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for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE, |
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plain-=RIJNDAEL_BLOCKSIZE) { |
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rijndael_decrypt(&c->r_ctx, cnow, plain); |
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ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE; |
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for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++) |
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plain[j] ^= ivp[j]; |
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} |
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memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE); |
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} |
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return (1); |
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} |
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static int |
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ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx) |
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{ |
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struct ssh_rijndael_ctx *c; |
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if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) { |
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memset(c, 0, sizeof(*c)); |
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xfree(c); |
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EVP_CIPHER_CTX_set_app_data(ctx, NULL); |
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} |
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return (1); |
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} |
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static const EVP_CIPHER * |
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evp_rijndael(void) |
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{ |
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static EVP_CIPHER rijndal_cbc; |
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memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER)); |
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rijndal_cbc.nid = NID_undef; |
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rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE; |
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rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE; |
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rijndal_cbc.key_len = 16; |
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rijndal_cbc.init = ssh_rijndael_init; |
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rijndal_cbc.cleanup = ssh_rijndael_cleanup; |
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rijndal_cbc.do_cipher = ssh_rijndael_cbc; |
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rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | |
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EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV; |
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return (&rijndal_cbc); |
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} |
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#endif |
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/* |
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* Exports an IV from the CipherContext required to export the key |
* Exports an IV from the CipherContext required to export the key |
* state back from the unprivileged child to the privileged parent |
* state back from the unprivileged child to the privileged parent |
* process. |
* process. |
*/ |
*/ |
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int |
int |
cipher_get_keyiv_len(CipherContext *cc) |
cipher_get_keyiv_len(const CipherContext *cc) |
{ |
{ |
Cipher *c = cc->cipher; |
Cipher *c = cc->cipher; |
int ivlen; |
int ivlen; |
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cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) |
cipher_get_keyiv(CipherContext *cc, u_char *iv, u_int len) |
{ |
{ |
Cipher *c = cc->cipher; |
Cipher *c = cc->cipher; |
u_char *civ = NULL; |
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int evplen; |
int evplen; |
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switch (c->number) { |
switch (c->number) { |
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if (evplen != len) |
if (evplen != len) |
fatal("%s: wrong iv length %d != %d", __func__, |
fatal("%s: wrong iv length %d != %d", __func__, |
evplen, len); |
evplen, len); |
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#if OPENSSL_VERSION_NUMBER < 0x00907000L |
#if OPENSSL_VERSION_NUMBER < 0x00907000L |
if (c->evptype == evp_rijndael) { |
if (c->evptype == evp_rijndael) |
struct ssh_rijndael_ctx *aesc; |
ssh_rijndael_iv(&cc->evp, 0, iv, len); |
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else |
aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); |
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if (aesc == NULL) |
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fatal("%s: no rijndael context", __func__); |
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civ = aesc->r_iv; |
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} else |
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#endif |
#endif |
{ |
if (c->evptype == evp_aes_128_ctr) |
civ = cc->evp.iv; |
ssh_aes_ctr_iv(&cc->evp, 0, iv, len); |
} |
else |
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memcpy(iv, cc->evp.iv, len); |
break; |
break; |
case SSH_CIPHER_3DES: { |
case SSH_CIPHER_3DES: |
struct ssh1_3des_ctx *desc; |
ssh1_3des_iv(&cc->evp, 0, iv, 24); |
if (len != 24) |
break; |
fatal("%s: bad 3des iv length: %d", __func__, len); |
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desc = EVP_CIPHER_CTX_get_app_data(&cc->evp); |
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if (desc == NULL) |
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fatal("%s: no 3des context", __func__); |
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debug3("%s: Copying 3DES IV", __func__); |
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memcpy(iv, desc->k1.iv, 8); |
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memcpy(iv + 8, desc->k2.iv, 8); |
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memcpy(iv + 16, desc->k3.iv, 8); |
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return; |
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} |
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default: |
default: |
fatal("%s: bad cipher %d", __func__, c->number); |
fatal("%s: bad cipher %d", __func__, c->number); |
} |
} |
memcpy(iv, civ, len); |
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} |
} |
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void |
void |
cipher_set_keyiv(CipherContext *cc, u_char *iv) |
cipher_set_keyiv(CipherContext *cc, u_char *iv) |
{ |
{ |
Cipher *c = cc->cipher; |
Cipher *c = cc->cipher; |
u_char *div = NULL; |
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int evplen = 0; |
int evplen = 0; |
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switch (c->number) { |
switch (c->number) { |
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evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
evplen = EVP_CIPHER_CTX_iv_length(&cc->evp); |
if (evplen == 0) |
if (evplen == 0) |
return; |
return; |
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#if OPENSSL_VERSION_NUMBER < 0x00907000L |
#if OPENSSL_VERSION_NUMBER < 0x00907000L |
if (c->evptype == evp_rijndael) { |
if (c->evptype == evp_rijndael) |
struct ssh_rijndael_ctx *aesc; |
ssh_rijndael_iv(&cc->evp, 1, iv, evplen); |
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else |
aesc = EVP_CIPHER_CTX_get_app_data(&cc->evp); |
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if (aesc == NULL) |
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fatal("%s: no rijndael context", __func__); |
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div = aesc->r_iv; |
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} else |
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#endif |
#endif |
{ |
if (c->evptype == evp_aes_128_ctr) |
div = cc->evp.iv; |
ssh_aes_ctr_iv(&cc->evp, 1, iv, evplen); |
} |
else |
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memcpy(cc->evp.iv, iv, evplen); |
break; |
break; |
case SSH_CIPHER_3DES: { |
case SSH_CIPHER_3DES: |
struct ssh1_3des_ctx *desc; |
ssh1_3des_iv(&cc->evp, 1, iv, 24); |
desc = EVP_CIPHER_CTX_get_app_data(&cc->evp); |
break; |
if (desc == NULL) |
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fatal("%s: no 3des context", __func__); |
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debug3("%s: Installed 3DES IV", __func__); |
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memcpy(desc->k1.iv, iv, 8); |
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memcpy(desc->k2.iv, iv + 8, 8); |
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memcpy(desc->k3.iv, iv + 16, 8); |
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return; |
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} |
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default: |
default: |
fatal("%s: bad cipher %d", __func__, c->number); |
fatal("%s: bad cipher %d", __func__, c->number); |
} |
} |
memcpy(div, iv, evplen); |
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} |
} |
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#if OPENSSL_VERSION_NUMBER < 0x00907000L |
#if OPENSSL_VERSION_NUMBER < 0x00907000L |
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#endif |
#endif |
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int |
int |
cipher_get_keycontext(CipherContext *cc, u_char *dat) |
cipher_get_keycontext(const CipherContext *cc, u_char *dat) |
{ |
{ |
Cipher *c = cc->cipher; |
Cipher *c = cc->cipher; |
int plen = 0; |
int plen = 0; |
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if (c->evptype == EVP_rc4) { |
if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { |
plen = EVP_X_STATE_LEN(cc->evp); |
plen = EVP_X_STATE_LEN(cc->evp); |
if (dat == NULL) |
if (dat == NULL) |
return (plen); |
return (plen); |
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Cipher *c = cc->cipher; |
Cipher *c = cc->cipher; |
int plen; |
int plen; |
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if (c->evptype == EVP_rc4) { |
if (c->evptype == EVP_rc4 || c->evptype == EVP_acss) { |
plen = EVP_X_STATE_LEN(cc->evp); |
plen = EVP_X_STATE_LEN(cc->evp); |
memcpy(EVP_X_STATE(cc->evp), dat, plen); |
memcpy(EVP_X_STATE(cc->evp), dat, plen); |
} |
} |