sync with OpenBSD -current
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20629a8b0d
commit
604988d5d3
GPG key ID:
F42C07F07E2E35B7
58 changed files with 592 additions and 377 deletions
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@ -1,4 +1,4 @@
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/* $OpenBSD: cmac.c,v 1.18 2023/12/18 21:15:00 tb Exp $ */
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/* $OpenBSD: cmac.c,v 1.20 2024/01/28 20:57:15 tb Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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@ -68,7 +68,7 @@
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* The temporary block tbl is a scratch buffer that holds intermediate secrets.
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*/
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struct CMAC_CTX_st {
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EVP_CIPHER_CTX cctx;
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EVP_CIPHER_CTX *cipher_ctx;
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unsigned char k1[EVP_MAX_BLOCK_LENGTH];
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unsigned char k2[EVP_MAX_BLOCK_LENGTH];
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unsigned char tbl[EVP_MAX_BLOCK_LENGTH];
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@ -112,19 +112,27 @@ CMAC_CTX_new(void)
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{
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CMAC_CTX *ctx;
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ctx = malloc(sizeof(CMAC_CTX));
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if (!ctx)
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return NULL;
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EVP_CIPHER_CTX_init(&ctx->cctx);
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if ((ctx = calloc(1, sizeof(CMAC_CTX))) == NULL)
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goto err;
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if ((ctx->cipher_ctx = EVP_CIPHER_CTX_new()) == NULL)
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goto err;
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ctx->nlast_block = -1;
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return ctx;
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err:
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CMAC_CTX_free(ctx);
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return NULL;
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}
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LCRYPTO_ALIAS(CMAC_CTX_new);
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void
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CMAC_CTX_cleanup(CMAC_CTX *ctx)
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{
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EVP_CIPHER_CTX_cleanup(&ctx->cctx);
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if (ctx->cipher_ctx != NULL)
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EVP_CIPHER_CTX_reset(ctx->cipher_ctx);
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explicit_bzero(ctx->tbl, EVP_MAX_BLOCK_LENGTH);
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explicit_bzero(ctx->k1, EVP_MAX_BLOCK_LENGTH);
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explicit_bzero(ctx->k2, EVP_MAX_BLOCK_LENGTH);
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@ -136,7 +144,7 @@ LCRYPTO_ALIAS(CMAC_CTX_cleanup);
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EVP_CIPHER_CTX *
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CMAC_CTX_get0_cipher_ctx(CMAC_CTX *ctx)
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{
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return &ctx->cctx;
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return ctx->cipher_ctx;
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}
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LCRYPTO_ALIAS(CMAC_CTX_get0_cipher_ctx);
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@ -147,7 +155,8 @@ CMAC_CTX_free(CMAC_CTX *ctx)
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return;
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CMAC_CTX_cleanup(ctx);
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free(ctx);
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EVP_CIPHER_CTX_free(ctx->cipher_ctx);
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freezero(ctx, sizeof(CMAC_CTX));
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}
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LCRYPTO_ALIAS(CMAC_CTX_free);
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@ -158,9 +167,9 @@ CMAC_CTX_copy(CMAC_CTX *out, const CMAC_CTX *in)
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if (in->nlast_block == -1)
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return 0;
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if (!EVP_CIPHER_CTX_copy(&out->cctx, &in->cctx))
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if (!EVP_CIPHER_CTX_copy(out->cipher_ctx, in->cipher_ctx))
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return 0;
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block_size = EVP_CIPHER_CTX_block_size(&in->cctx);
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block_size = EVP_CIPHER_CTX_block_size(in->cipher_ctx);
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memcpy(out->k1, in->k1, block_size);
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memcpy(out->k2, in->k2, block_size);
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memcpy(out->tbl, in->tbl, block_size);
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@ -182,7 +191,7 @@ CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
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/* Not initialised */
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if (ctx->nlast_block == -1)
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return 0;
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
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if (!EVP_EncryptInit_ex(ctx->cipher_ctx, NULL, NULL, NULL, zero_iv))
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return 0;
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explicit_bzero(ctx->tbl, sizeof(ctx->tbl));
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ctx->nlast_block = 0;
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@ -198,17 +207,17 @@ CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
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*/
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if ((cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) != 0)
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return 0;
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if (!EVP_EncryptInit_ex(&ctx->cctx, cipher, NULL, NULL, NULL))
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if (!EVP_EncryptInit_ex(ctx->cipher_ctx, cipher, NULL, NULL, NULL))
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return 0;
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}
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/* Non-NULL key means initialisation is complete. */
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if (key != NULL) {
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if (EVP_CIPHER_CTX_cipher(&ctx->cctx) == NULL)
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if (EVP_CIPHER_CTX_cipher(ctx->cipher_ctx) == NULL)
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return 0;
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/* make_kn() only supports block sizes of 8 and 16 bytes. */
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block_size = EVP_CIPHER_CTX_block_size(&ctx->cctx);
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block_size = EVP_CIPHER_CTX_block_size(ctx->cipher_ctx);
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if (block_size != 8 && block_size != 16)
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return 0;
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@ -216,11 +225,11 @@ CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
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* Section 6.1, step 1: store the intermediate secret CIPH_K(0)
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* in ctx->tbl.
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*/
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if (!EVP_CIPHER_CTX_set_key_length(&ctx->cctx, keylen))
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if (!EVP_CIPHER_CTX_set_key_length(ctx->cipher_ctx, keylen))
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return 0;
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, key, zero_iv))
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if (!EVP_EncryptInit_ex(ctx->cipher_ctx, NULL, NULL, key, zero_iv))
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return 0;
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, zero_iv, block_size))
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if (!EVP_Cipher(ctx->cipher_ctx, ctx->tbl, zero_iv, block_size))
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return 0;
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/* Section 6.1, step 2: compute k1 from intermediate secret. */
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@ -233,7 +242,7 @@ CMAC_Init(CMAC_CTX *ctx, const void *key, size_t keylen,
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ctx->nlast_block = 0;
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/* Reset context again to get ready for the first data block. */
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if (!EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, zero_iv))
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if (!EVP_EncryptInit_ex(ctx->cipher_ctx, NULL, NULL, NULL, zero_iv))
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return 0;
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}
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@ -251,7 +260,7 @@ CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
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return 0;
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if (dlen == 0)
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return 1;
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block_size = EVP_CIPHER_CTX_block_size(&ctx->cctx);
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block_size = EVP_CIPHER_CTX_block_size(ctx->cipher_ctx);
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/* Copy into partial block if we need to */
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if (ctx->nlast_block > 0) {
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size_t nleft;
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@ -267,13 +276,13 @@ CMAC_Update(CMAC_CTX *ctx, const void *in, size_t dlen)
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return 1;
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data += nleft;
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/* Else not final block so encrypt it */
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, ctx->last_block,
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if (!EVP_Cipher(ctx->cipher_ctx, ctx->tbl, ctx->last_block,
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block_size))
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return 0;
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}
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/* Encrypt all but one of the complete blocks left */
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while (dlen > block_size) {
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if (!EVP_Cipher(&ctx->cctx, ctx->tbl, data, block_size))
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if (!EVP_Cipher(ctx->cipher_ctx, ctx->tbl, data, block_size))
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return 0;
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dlen -= block_size;
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data += block_size;
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@ -292,7 +301,7 @@ CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
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if (ctx->nlast_block == -1)
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return 0;
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block_size = EVP_CIPHER_CTX_block_size(&ctx->cctx);
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block_size = EVP_CIPHER_CTX_block_size(ctx->cipher_ctx);
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*poutlen = (size_t)block_size;
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if (!out)
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return 1;
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@ -308,7 +317,7 @@ CMAC_Final(CMAC_CTX *ctx, unsigned char *out, size_t *poutlen)
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for (i = 0; i < block_size; i++)
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out[i] = ctx->last_block[i] ^ ctx->k2[i];
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}
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if (!EVP_Cipher(&ctx->cctx, out, out, block_size)) {
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if (!EVP_Cipher(ctx->cipher_ctx, out, out, block_size)) {
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explicit_bzero(out, block_size);
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return 0;
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}
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@ -327,6 +336,6 @@ CMAC_resume(CMAC_CTX *ctx)
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* So reinitialising using the last decrypted block will allow
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* CMAC to continue after calling CMAC_Final().
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*/
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return EVP_EncryptInit_ex(&ctx->cctx, NULL, NULL, NULL, ctx->tbl);
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return EVP_EncryptInit_ex(ctx->cipher_ctx, NULL, NULL, NULL, ctx->tbl);
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}
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LCRYPTO_ALIAS(CMAC_resume);
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