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Add DES-CBC support into internal crypto implementation

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This commit is contained in:
Jouni Malinen 2009-10-17 12:05:06 +03:00
parent 8ef74414fc
commit 506b45ed22
2 changed files with 74 additions and 0 deletions
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45
src/crypto/crypto_internal.c
View File

@ -38,6 +38,10 @@ void des3_key_setup(const u8 *key, struct des3_key_s *dkey);
void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt); void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt);
void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain); void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain);
void des_key_setup(const u8 *key, u32 *ek, u32 *dk);
void des_block_encrypt(const u8 *plain, const u32 *ek, u8 *crypt);
void des_block_decrypt(const u8 *crypt, const u32 *dk, u8 *plain);
struct MD5Context { struct MD5Context {
u32 buf[4]; u32 buf[4];
@ -245,6 +249,11 @@ struct crypto_cipher {
struct des3_key_s key; struct des3_key_s key;
u8 cbc[8]; u8 cbc[8];
} des3; } des3;
struct {
u32 ek[32];
u32 dk[32];
u8 cbc[8];
} des;
} u; } u;
}; };
@ -297,6 +306,14 @@ struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
des3_key_setup(key, &ctx->u.des3.key); des3_key_setup(key, &ctx->u.des3.key);
os_memcpy(ctx->u.des3.cbc, iv, 8); os_memcpy(ctx->u.des3.cbc, iv, 8);
break; break;
case CRYPTO_CIPHER_ALG_DES:
if (key_len != 8) {
os_free(ctx);
return NULL;
}
des_key_setup(key, ctx->u.des.ek, ctx->u.des.dk);
os_memcpy(ctx->u.des.cbc, iv, 8);
break;
default: default:
os_free(ctx); os_free(ctx);
return NULL; return NULL;
@ -348,6 +365,20 @@ int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
crypt += 8; crypt += 8;
} }
break; break;
case CRYPTO_CIPHER_ALG_DES:
if (len % 8)
return -1;
blocks = len / 8;
for (i = 0; i < blocks; i++) {
for (j = 0; j < 8; j++)
ctx->u.des3.cbc[j] ^= plain[j];
des_block_encrypt(ctx->u.des.cbc, ctx->u.des.ek,
ctx->u.des.cbc);
os_memcpy(crypt, ctx->u.des.cbc, 8);
plain += 8;
crypt += 8;
}
break;
default: default:
return -1; return -1;
} }
@ -398,6 +429,20 @@ int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
crypt += 8; crypt += 8;
} }
break; break;
case CRYPTO_CIPHER_ALG_DES:
if (len % 8)
return -1;
blocks = len / 8;
for (i = 0; i < blocks; i++) {
os_memcpy(tmp, crypt, 8);
des_block_decrypt(crypt, ctx->u.des.dk, plain);
for (j = 0; j < 8; j++)
plain[j] ^= ctx->u.des.cbc[j];
os_memcpy(ctx->u.des.cbc, tmp, 8);
plain += 8;
crypt += 8;
}
break;
default: default:
return -1; return -1;
} }

29
src/crypto/des-internal.c
View File

@ -429,6 +429,35 @@ void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
} }
void des_key_setup(const u8 *key, u32 *ek, u32 *dk)
{
deskey(key, 0, ek);
deskey(key, 1, dk);
}
void des_block_encrypt(const u8 *plain, const u32 *ek, u8 *crypt)
{
u32 work[2];
work[0] = WPA_GET_BE32(plain);
work[1] = WPA_GET_BE32(plain + 4);
desfunc(work, ek);
WPA_PUT_BE32(crypt, work[0]);
WPA_PUT_BE32(crypt + 4, work[1]);
}
void des_block_decrypt(const u8 *crypt, const u32 *dk, u8 *plain)
{
u32 work[2];
work[0] = WPA_GET_BE32(crypt);
work[1] = WPA_GET_BE32(crypt + 4);
desfunc(work, dk);
WPA_PUT_BE32(plain, work[0]);
WPA_PUT_BE32(plain + 4, work[1]);
}
struct des3_key_s { struct des3_key_s {
u32 ek[3][32]; u32 ek[3][32];
u32 dk[3][32]; u32 dk[3][32];