diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/evp/evp_enc.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/evp/evp_enc.c | 642 |
1 files changed, 642 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/evp/evp_enc.c b/openssl-1.1.0h/crypto/evp/evp_enc.c new file mode 100644 index 0000000..e5807ed --- /dev/null +++ b/openssl-1.1.0h/crypto/evp/evp_enc.c @@ -0,0 +1,642 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <stdio.h> +#include <assert.h> +#include "internal/cryptlib.h" +#include <openssl/evp.h> +#include <openssl/err.h> +#include <openssl/rand.h> +#include <openssl/engine.h> +#include "internal/evp_int.h" +#include "evp_locl.h" + +int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c) +{ + if (c == NULL) + return 1; + if (c->cipher != NULL) { + if (c->cipher->cleanup && !c->cipher->cleanup(c)) + return 0; + /* Cleanse cipher context data */ + if (c->cipher_data && c->cipher->ctx_size) + OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); + } + OPENSSL_free(c->cipher_data); +#ifndef OPENSSL_NO_ENGINE + ENGINE_finish(c->engine); +#endif + memset(c, 0, sizeof(*c)); + return 1; +} + +EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) +{ + return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX)); +} + +void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) +{ + EVP_CIPHER_CTX_reset(ctx); + OPENSSL_free(ctx); +} + +int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const unsigned char *key, const unsigned char *iv, int enc) +{ + if (cipher != NULL) + EVP_CIPHER_CTX_reset(ctx); + return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); +} + +int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *impl, const unsigned char *key, + const unsigned char *iv, int enc) +{ + if (enc == -1) + enc = ctx->encrypt; + else { + if (enc) + enc = 1; + ctx->encrypt = enc; + } +#ifndef OPENSSL_NO_ENGINE + /* + * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so + * this context may already have an ENGINE! Try to avoid releasing the + * previous handle, re-querying for an ENGINE, and having a + * reinitialisation, when it may all be unnecessary. + */ + if (ctx->engine && ctx->cipher + && (cipher == NULL || cipher->nid == ctx->cipher->nid)) + goto skip_to_init; +#endif + if (cipher) { + /* + * Ensure a context left lying around from last time is cleared (the + * previous check attempted to avoid this if the same ENGINE and + * EVP_CIPHER could be used). + */ + if (ctx->cipher) { + unsigned long flags = ctx->flags; + EVP_CIPHER_CTX_reset(ctx); + /* Restore encrypt and flags */ + ctx->encrypt = enc; + ctx->flags = flags; + } +#ifndef OPENSSL_NO_ENGINE + if (impl) { + if (!ENGINE_init(impl)) { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + } else + /* Ask if an ENGINE is reserved for this job */ + impl = ENGINE_get_cipher_engine(cipher->nid); + if (impl) { + /* There's an ENGINE for this job ... (apparently) */ + const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid); + if (!c) { + /* + * One positive side-effect of US's export control history, + * is that we should at least be able to avoid using US + * misspellings of "initialisation"? + */ + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + /* We'll use the ENGINE's private cipher definition */ + cipher = c; + /* + * Store the ENGINE functional reference so we know 'cipher' came + * from an ENGINE and we need to release it when done. + */ + ctx->engine = impl; + } else + ctx->engine = NULL; +#endif + + ctx->cipher = cipher; + if (ctx->cipher->ctx_size) { + ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size); + if (ctx->cipher_data == NULL) { + ctx->cipher = NULL; + EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE); + return 0; + } + } else { + ctx->cipher_data = NULL; + } + ctx->key_len = cipher->key_len; + /* Preserve wrap enable flag, zero everything else */ + ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW; + if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { + if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { + ctx->cipher = NULL; + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR); + return 0; + } + } + } else if (!ctx->cipher) { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); + return 0; + } +#ifndef OPENSSL_NO_ENGINE + skip_to_init: +#endif + /* we assume block size is a power of 2 in *cryptUpdate */ + OPENSSL_assert(ctx->cipher->block_size == 1 + || ctx->cipher->block_size == 8 + || ctx->cipher->block_size == 16); + + if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW) + && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) { + EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED); + return 0; + } + + if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) { + switch (EVP_CIPHER_CTX_mode(ctx)) { + + case EVP_CIPH_STREAM_CIPHER: + case EVP_CIPH_ECB_MODE: + break; + + case EVP_CIPH_CFB_MODE: + case EVP_CIPH_OFB_MODE: + + ctx->num = 0; + /* fall-through */ + + case EVP_CIPH_CBC_MODE: + + OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <= + (int)sizeof(ctx->iv)); + if (iv) + memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); + memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); + break; + + case EVP_CIPH_CTR_MODE: + ctx->num = 0; + /* Don't reuse IV for CTR mode */ + if (iv) + memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); + break; + + default: + return 0; + } + } + + if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { + if (!ctx->cipher->init(ctx, key, iv, enc)) + return 0; + } + ctx->buf_len = 0; + ctx->final_used = 0; + ctx->block_mask = ctx->cipher->block_size - 1; + return 1; +} + +int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, + const unsigned char *in, int inl) +{ + if (ctx->encrypt) + return EVP_EncryptUpdate(ctx, out, outl, in, inl); + else + return EVP_DecryptUpdate(ctx, out, outl, in, inl); +} + +int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + if (ctx->encrypt) + return EVP_EncryptFinal_ex(ctx, out, outl); + else + return EVP_DecryptFinal_ex(ctx, out, outl); +} + +int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + if (ctx->encrypt) + return EVP_EncryptFinal(ctx, out, outl); + else + return EVP_DecryptFinal(ctx, out, outl); +} + +int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const unsigned char *key, const unsigned char *iv) +{ + return EVP_CipherInit(ctx, cipher, key, iv, 1); +} + +int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *impl, const unsigned char *key, + const unsigned char *iv) +{ + return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); +} + +int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const unsigned char *key, const unsigned char *iv) +{ + return EVP_CipherInit(ctx, cipher, key, iv, 0); +} + +int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *impl, const unsigned char *key, + const unsigned char *iv) +{ + return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); +} + +/* + * According to the letter of standard difference between pointers + * is specified to be valid only within same object. This makes + * it formally challenging to determine if input and output buffers + * are not partially overlapping with standard pointer arithmetic. + */ +#ifdef PTRDIFF_T +# undef PTRDIFF_T +#endif +#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64 +/* + * Then we have VMS that distinguishes itself by adhering to + * sizeof(size_t)==4 even in 64-bit builds, which means that + * difference between two pointers might be truncated to 32 bits. + * In the context one can even wonder how comparison for + * equality is implemented. To be on the safe side we adhere to + * PTRDIFF_T even for comparison for equality. + */ +# define PTRDIFF_T uint64_t +#else +# define PTRDIFF_T size_t +#endif + +int is_partially_overlapping(const void *ptr1, const void *ptr2, int len) +{ + PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2; + /* + * Check for partially overlapping buffers. [Binary logical + * operations are used instead of boolean to minimize number + * of conditional branches.] + */ + int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | + (diff > (0 - (PTRDIFF_T)len))); + + return overlapped; +} + +int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, + const unsigned char *in, int inl) +{ + int i, j, bl, cmpl = inl; + + if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) + cmpl = (cmpl + 7) / 8; + + bl = ctx->cipher->block_size; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + /* If block size > 1 then the cipher will have to do this check */ + if (bl == 1 && is_partially_overlapping(out, in, cmpl)) { + EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); + return 0; + } + + i = ctx->cipher->do_cipher(ctx, out, in, inl); + if (i < 0) + return 0; + else + *outl = i; + return 1; + } + + if (inl <= 0) { + *outl = 0; + return inl == 0; + } + if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) { + EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); + return 0; + } + + if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) { + if (ctx->cipher->do_cipher(ctx, out, in, inl)) { + *outl = inl; + return 1; + } else { + *outl = 0; + return 0; + } + } + i = ctx->buf_len; + OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); + if (i != 0) { + if (bl - i > inl) { + memcpy(&(ctx->buf[i]), in, inl); + ctx->buf_len += inl; + *outl = 0; + return 1; + } else { + j = bl - i; + memcpy(&(ctx->buf[i]), in, j); + inl -= j; + in += j; + if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) + return 0; + out += bl; + *outl = bl; + } + } else + *outl = 0; + i = inl & (bl - 1); + inl -= i; + if (inl > 0) { + if (!ctx->cipher->do_cipher(ctx, out, in, inl)) + return 0; + *outl += inl; + } + + if (i != 0) + memcpy(ctx->buf, &(in[inl]), i); + ctx->buf_len = i; + return 1; +} + +int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + int ret; + ret = EVP_EncryptFinal_ex(ctx, out, outl); + return ret; +} + +int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + int n, ret; + unsigned int i, b, bl; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + ret = ctx->cipher->do_cipher(ctx, out, NULL, 0); + if (ret < 0) + return 0; + else + *outl = ret; + return 1; + } + + b = ctx->cipher->block_size; + OPENSSL_assert(b <= sizeof(ctx->buf)); + if (b == 1) { + *outl = 0; + return 1; + } + bl = ctx->buf_len; + if (ctx->flags & EVP_CIPH_NO_PADDING) { + if (bl) { + EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, + EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); + return 0; + } + *outl = 0; + return 1; + } + + n = b - bl; + for (i = bl; i < b; i++) + ctx->buf[i] = n; + ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b); + + if (ret) + *outl = b; + + return ret; +} + +int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, + const unsigned char *in, int inl) +{ + int fix_len, cmpl = inl; + unsigned int b; + + b = ctx->cipher->block_size; + + if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS)) + cmpl = (cmpl + 7) / 8; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + if (b == 1 && is_partially_overlapping(out, in, cmpl)) { + EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); + return 0; + } + + fix_len = ctx->cipher->do_cipher(ctx, out, in, inl); + if (fix_len < 0) { + *outl = 0; + return 0; + } else + *outl = fix_len; + return 1; + } + + if (inl <= 0) { + *outl = 0; + return inl == 0; + } + + if (ctx->flags & EVP_CIPH_NO_PADDING) + return EVP_EncryptUpdate(ctx, out, outl, in, inl); + + OPENSSL_assert(b <= sizeof(ctx->final)); + + if (ctx->final_used) { + /* see comment about PTRDIFF_T comparison above */ + if (((PTRDIFF_T)out == (PTRDIFF_T)in) + || is_partially_overlapping(out, in, b)) { + EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING); + return 0; + } + memcpy(out, ctx->final, b); + out += b; + fix_len = 1; + } else + fix_len = 0; + + if (!EVP_EncryptUpdate(ctx, out, outl, in, inl)) + return 0; + + /* + * if we have 'decrypted' a multiple of block size, make sure we have a + * copy of this last block + */ + if (b > 1 && !ctx->buf_len) { + *outl -= b; + ctx->final_used = 1; + memcpy(ctx->final, &out[*outl], b); + } else + ctx->final_used = 0; + + if (fix_len) + *outl += b; + + return 1; +} + +int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + int ret; + ret = EVP_DecryptFinal_ex(ctx, out, outl); + return ret; +} + +int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) +{ + int i, n; + unsigned int b; + *outl = 0; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + i = ctx->cipher->do_cipher(ctx, out, NULL, 0); + if (i < 0) + return 0; + else + *outl = i; + return 1; + } + + b = ctx->cipher->block_size; + if (ctx->flags & EVP_CIPH_NO_PADDING) { + if (ctx->buf_len) { + EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, + EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); + return 0; + } + *outl = 0; + return 1; + } + if (b > 1) { + if (ctx->buf_len || !ctx->final_used) { + EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH); + return (0); + } + OPENSSL_assert(b <= sizeof(ctx->final)); + + /* + * The following assumes that the ciphertext has been authenticated. + * Otherwise it provides a padding oracle. + */ + n = ctx->final[b - 1]; + if (n == 0 || n > (int)b) { + EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); + return (0); + } + for (i = 0; i < n; i++) { + if (ctx->final[--b] != n) { + EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT); + return (0); + } + } + n = ctx->cipher->block_size - n; + for (i = 0; i < n; i++) + out[i] = ctx->final[i]; + *outl = n; + } else + *outl = 0; + return (1); +} + +int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen) +{ + if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH) + return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL); + if (c->key_len == keylen) + return 1; + if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { + c->key_len = keylen; + return 1; + } + EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH); + return 0; +} + +int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) +{ + if (pad) + ctx->flags &= ~EVP_CIPH_NO_PADDING; + else + ctx->flags |= EVP_CIPH_NO_PADDING; + return 1; +} + +int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) +{ + int ret; + if (!ctx->cipher) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET); + return 0; + } + + if (!ctx->cipher->ctrl) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED); + return 0; + } + + ret = ctx->cipher->ctrl(ctx, type, arg, ptr); + if (ret == -1) { + EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, + EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); + return 0; + } + return ret; +} + +int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key) +{ + if (ctx->cipher->flags & EVP_CIPH_RAND_KEY) + return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key); + if (RAND_bytes(key, ctx->key_len) <= 0) + return 0; + return 1; +} + +int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) +{ + if ((in == NULL) || (in->cipher == NULL)) { + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED); + return 0; + } +#ifndef OPENSSL_NO_ENGINE + /* Make sure it's safe to copy a cipher context using an ENGINE */ + if (in->engine && !ENGINE_init(in->engine)) { + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB); + return 0; + } +#endif + + EVP_CIPHER_CTX_reset(out); + memcpy(out, in, sizeof(*out)); + + if (in->cipher_data && in->cipher->ctx_size) { + out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); + if (out->cipher_data == NULL) { + out->cipher = NULL; + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE); + return 0; + } + memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); + } + + if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) + if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { + out->cipher = NULL; + EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR); + return 0; + } + return 1; +} |