initial commit, 4.5 stable

thirdparty/mbedtls/library/pkcs5.c

@@ -0,0 +1,500 @@
+/**
+ * \file pkcs5.c
+ *
+ * \brief PKCS#5 functions
+ *
+ * \author Mathias Olsson <mathias@kompetensum.com>
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+/*
+ * PKCS#5 includes PBKDF2 and more
+ *
+ * http://tools.ietf.org/html/rfc2898 (Specification)
+ * http://tools.ietf.org/html/rfc6070 (Test vectors)
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_PKCS5_C)
+
+#include "mbedtls/pkcs5.h"
+#include "mbedtls/error.h"
+
+#if defined(MBEDTLS_ASN1_PARSE_C)
+#include "mbedtls/asn1.h"
+#if defined(MBEDTLS_CIPHER_C)
+#include "mbedtls/cipher.h"
+#endif /* MBEDTLS_CIPHER_C */
+#include "mbedtls/oid.h"
+#endif /* MBEDTLS_ASN1_PARSE_C */
+
+#include <string.h>
+
+#include "mbedtls/platform.h"
+
+#include "psa_util_internal.h"
+
+#if defined(MBEDTLS_ASN1_PARSE_C) && defined(MBEDTLS_CIPHER_C)
+static int pkcs5_parse_pbkdf2_params(const mbedtls_asn1_buf *params,
+                                     mbedtls_asn1_buf *salt, int *iterations,
+                                     int *keylen, mbedtls_md_type_t *md_type)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    mbedtls_asn1_buf prf_alg_oid;
+    unsigned char *p = params->p;
+    const unsigned char *end = params->p + params->len;
+
+    if (params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT,
+                                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
+    }
+    /*
+     *  PBKDF2-params ::= SEQUENCE {
+     *    salt              OCTET STRING,
+     *    iterationCount    INTEGER,
+     *    keyLength         INTEGER OPTIONAL
+     *    prf               AlgorithmIdentifier DEFAULT algid-hmacWithSHA1
+     *  }
+     *
+     */
+    if ((ret = mbedtls_asn1_get_tag(&p, end, &salt->len,
+                                    MBEDTLS_ASN1_OCTET_STRING)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+    }
+
+    salt->p = p;
+    p += salt->len;
+
+    if ((ret = mbedtls_asn1_get_int(&p, end, iterations)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+    }
+
+    if (p == end) {
+        return 0;
+    }
+
+    if ((ret = mbedtls_asn1_get_int(&p, end, keylen)) != 0) {
+        if (ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
+            return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+        }
+    }
+
+    if (p == end) {
+        return 0;
+    }
+
+    if ((ret = mbedtls_asn1_get_alg_null(&p, end, &prf_alg_oid)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+    }
+
+    if (mbedtls_oid_get_md_hmac(&prf_alg_oid, md_type) != 0) {
+        return MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE;
+    }
+
+    if (p != end) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT,
+                                 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
+    }
+
+    return 0;
+}
+
+#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
+int mbedtls_pkcs5_pbes2_ext(const mbedtls_asn1_buf *pbe_params, int mode,
+                            const unsigned char *pwd,  size_t pwdlen,
+                            const unsigned char *data, size_t datalen,
+                            unsigned char *output, size_t output_size,
+                            size_t *output_len);
+#endif
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+int mbedtls_pkcs5_pbes2(const mbedtls_asn1_buf *pbe_params, int mode,
+                        const unsigned char *pwd,  size_t pwdlen,
+                        const unsigned char *data, size_t datalen,
+                        unsigned char *output)
+{
+    size_t output_len = 0;
+
+    /* We assume caller of the function is providing a big enough output buffer
+     * so we pass output_size as SIZE_MAX to pass checks, However, no guarantees
+     * for the output size actually being correct.
+     */
+    return mbedtls_pkcs5_pbes2_ext(pbe_params, mode, pwd, pwdlen, data,
+                                   datalen, output, SIZE_MAX, &output_len);
+}
+#endif
+
+int mbedtls_pkcs5_pbes2_ext(const mbedtls_asn1_buf *pbe_params, int mode,
+                            const unsigned char *pwd,  size_t pwdlen,
+                            const unsigned char *data, size_t datalen,
+                            unsigned char *output, size_t output_size,
+                            size_t *output_len)
+{
+    int ret, iterations = 0, keylen = 0;
+    unsigned char *p, *end;
+    mbedtls_asn1_buf kdf_alg_oid, enc_scheme_oid, kdf_alg_params, enc_scheme_params;
+    mbedtls_asn1_buf salt;
+    mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
+    unsigned char key[32], iv[32];
+    const mbedtls_cipher_info_t *cipher_info;
+    mbedtls_cipher_type_t cipher_alg;
+    mbedtls_cipher_context_t cipher_ctx;
+    unsigned int padlen = 0;
+
+    p = pbe_params->p;
+    end = p + pbe_params->len;
+
+    /*
+     *  PBES2-params ::= SEQUENCE {
+     *    keyDerivationFunc AlgorithmIdentifier {{PBES2-KDFs}},
+     *    encryptionScheme AlgorithmIdentifier {{PBES2-Encs}}
+     *  }
+     */
+    if (pbe_params->tag != (MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT,
+                                 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG);
+    }
+
+    if ((ret = mbedtls_asn1_get_alg(&p, end, &kdf_alg_oid,
+                                    &kdf_alg_params)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+    }
+
+    // Only PBKDF2 supported at the moment
+    //
+    if (MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS5_PBKDF2, &kdf_alg_oid) != 0) {
+        return MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE;
+    }
+
+    if ((ret = pkcs5_parse_pbkdf2_params(&kdf_alg_params,
+                                         &salt, &iterations, &keylen,
+                                         &md_type)) != 0) {
+        return ret;
+    }
+
+    if ((ret = mbedtls_asn1_get_alg(&p, end, &enc_scheme_oid,
+                                    &enc_scheme_params)) != 0) {
+        return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PKCS5_INVALID_FORMAT, ret);
+    }
+
+    if (mbedtls_oid_get_cipher_alg(&enc_scheme_oid, &cipher_alg) != 0) {
+        return MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE;
+    }
+
+    cipher_info = mbedtls_cipher_info_from_type(cipher_alg);
+    if (cipher_info == NULL) {
+        return MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE;
+    }
+
+    /*
+     * The value of keylen from pkcs5_parse_pbkdf2_params() is ignored
+     * since it is optional and we don't know if it was set or not
+     */
+    keylen = (int) mbedtls_cipher_info_get_key_bitlen(cipher_info) / 8;
+
+    if (enc_scheme_params.tag != MBEDTLS_ASN1_OCTET_STRING ||
+        enc_scheme_params.len != mbedtls_cipher_info_get_iv_size(cipher_info)) {
+        return MBEDTLS_ERR_PKCS5_INVALID_FORMAT;
+    }
+
+    if (mode == MBEDTLS_PKCS5_DECRYPT) {
+        if (output_size < datalen) {
+            return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
+        }
+    }
+
+    if (mode == MBEDTLS_PKCS5_ENCRYPT) {
+        padlen = cipher_info->block_size - (datalen % cipher_info->block_size);
+        if (output_size < (datalen + padlen)) {
+            return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
+        }
+    }
+
+    mbedtls_cipher_init(&cipher_ctx);
+
+    memcpy(iv, enc_scheme_params.p, enc_scheme_params.len);
+
+    if ((ret = mbedtls_pkcs5_pbkdf2_hmac_ext(md_type, pwd, pwdlen, salt.p,
+                                             salt.len, iterations, keylen,
+                                             key)) != 0) {
+        goto exit;
+    }
+
+    if ((ret = mbedtls_cipher_setup(&cipher_ctx, cipher_info)) != 0) {
+        goto exit;
+    }
+
+    if ((ret = mbedtls_cipher_setkey(&cipher_ctx, key, 8 * keylen,
+                                     (mbedtls_operation_t) mode)) != 0) {
+        goto exit;
+    }
+
+#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
+    {
+        /* PKCS5 uses CBC with PKCS7 padding (which is the same as
+         * "PKCS5 padding" except that it's typically only called PKCS5
+         * with 64-bit-block ciphers).
+         */
+        mbedtls_cipher_padding_t padding = MBEDTLS_PADDING_PKCS7;
+#if !defined(MBEDTLS_CIPHER_PADDING_PKCS7)
+        /* For historical reasons, when decrypting, this function works when
+         * decrypting even when support for PKCS7 padding is disabled. In this
+         * case, it ignores the padding, and so will never report a
+         * password mismatch.
+         */
+        if (mode == MBEDTLS_DECRYPT) {
+            padding = MBEDTLS_PADDING_NONE;
+        }
+#endif
+        if ((ret = mbedtls_cipher_set_padding_mode(&cipher_ctx, padding)) != 0) {
+            goto exit;
+        }
+    }
+#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
+    if ((ret = mbedtls_cipher_crypt(&cipher_ctx, iv, enc_scheme_params.len,
+                                    data, datalen, output, output_len)) != 0) {
+        ret = MBEDTLS_ERR_PKCS5_PASSWORD_MISMATCH;
+    }
+
+exit:
+    mbedtls_cipher_free(&cipher_ctx);
+
+    return ret;
+}
+#endif /* MBEDTLS_ASN1_PARSE_C && MBEDTLS_CIPHER_C */
+
+static int pkcs5_pbkdf2_hmac(mbedtls_md_context_t *ctx,
+                             const unsigned char *password,
+                             size_t plen, const unsigned char *salt, size_t slen,
+                             unsigned int iteration_count,
+                             uint32_t key_length, unsigned char *output)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    unsigned int i;
+    unsigned char md1[MBEDTLS_MD_MAX_SIZE];
+    unsigned char work[MBEDTLS_MD_MAX_SIZE];
+    unsigned char md_size = mbedtls_md_get_size(ctx->md_info);
+    size_t use_len;
+    unsigned char *out_p = output;
+    unsigned char counter[4];
+
+    memset(counter, 0, 4);
+    counter[3] = 1;
+
+#if UINT_MAX > 0xFFFFFFFF
+    if (iteration_count > 0xFFFFFFFF) {
+        return MBEDTLS_ERR_PKCS5_BAD_INPUT_DATA;
+    }
+#endif
+
+    if ((ret = mbedtls_md_hmac_starts(ctx, password, plen)) != 0) {
+        return ret;
+    }
+    while (key_length) {
+        // U1 ends up in work
+        //
+        if ((ret = mbedtls_md_hmac_update(ctx, salt, slen)) != 0) {
+            goto cleanup;
+        }
+
+        if ((ret = mbedtls_md_hmac_update(ctx, counter, 4)) != 0) {
+            goto cleanup;
+        }
+
+        if ((ret = mbedtls_md_hmac_finish(ctx, work)) != 0) {
+            goto cleanup;
+        }
+
+        if ((ret = mbedtls_md_hmac_reset(ctx)) != 0) {
+            goto cleanup;
+        }
+
+        memcpy(md1, work, md_size);
+
+        for (i = 1; i < iteration_count; i++) {
+            // U2 ends up in md1
+            //
+            if ((ret = mbedtls_md_hmac_update(ctx, md1, md_size)) != 0) {
+                goto cleanup;
+            }
+
+            if ((ret = mbedtls_md_hmac_finish(ctx, md1)) != 0) {
+                goto cleanup;
+            }
+
+            if ((ret = mbedtls_md_hmac_reset(ctx)) != 0) {
+                goto cleanup;
+            }
+
+            // U1 xor U2
+            //
+            mbedtls_xor(work, work, md1, md_size);
+        }
+
+        use_len = (key_length < md_size) ? key_length : md_size;
+        memcpy(out_p, work, use_len);
+
+        key_length -= (uint32_t) use_len;
+        out_p += use_len;
+
+        for (i = 4; i > 0; i--) {
+            if (++counter[i - 1] != 0) {
+                break;
+            }
+        }
+    }
+
+cleanup:
+    /* Zeroise buffers to clear sensitive data from memory. */
+    mbedtls_platform_zeroize(work, MBEDTLS_MD_MAX_SIZE);
+    mbedtls_platform_zeroize(md1, MBEDTLS_MD_MAX_SIZE);
+
+    return ret;
+}
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+int mbedtls_pkcs5_pbkdf2_hmac(mbedtls_md_context_t *ctx,
+                              const unsigned char *password,
+                              size_t plen, const unsigned char *salt, size_t slen,
+                              unsigned int iteration_count,
+                              uint32_t key_length, unsigned char *output)
+{
+    return pkcs5_pbkdf2_hmac(ctx, password, plen, salt, slen, iteration_count,
+                             key_length, output);
+}
+#endif
+
+int mbedtls_pkcs5_pbkdf2_hmac_ext(mbedtls_md_type_t md_alg,
+                                  const unsigned char *password,
+                                  size_t plen, const unsigned char *salt, size_t slen,
+                                  unsigned int iteration_count,
+                                  uint32_t key_length, unsigned char *output)
+{
+    mbedtls_md_context_t md_ctx;
+    const mbedtls_md_info_t *md_info = NULL;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    md_info = mbedtls_md_info_from_type(md_alg);
+    if (md_info == NULL) {
+        return MBEDTLS_ERR_PKCS5_FEATURE_UNAVAILABLE;
+    }
+
+    mbedtls_md_init(&md_ctx);
+
+    if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) {
+        goto exit;
+    }
+    ret = pkcs5_pbkdf2_hmac(&md_ctx, password, plen, salt, slen,
+                            iteration_count, key_length, output);
+exit:
+    mbedtls_md_free(&md_ctx);
+    return ret;
+}
+
+#if defined(MBEDTLS_SELF_TEST)
+
+#if !defined(MBEDTLS_MD_CAN_SHA1)
+int mbedtls_pkcs5_self_test(int verbose)
+{
+    if (verbose != 0) {
+        mbedtls_printf("  PBKDF2 (SHA1): skipped\n\n");
+    }
+
+    return 0;
+}
+#else
+
+#define MAX_TESTS   6
+
+static const size_t plen_test_data[MAX_TESTS] =
+{ 8, 8, 8, 24, 9 };
+
+static const unsigned char password_test_data[MAX_TESTS][32] =
+{
+    "password",
+    "password",
+    "password",
+    "passwordPASSWORDpassword",
+    "pass\0word",
+};
+
+static const size_t slen_test_data[MAX_TESTS] =
+{ 4, 4, 4, 36, 5 };
+
+static const unsigned char salt_test_data[MAX_TESTS][40] =
+{
+    "salt",
+    "salt",
+    "salt",
+    "saltSALTsaltSALTsaltSALTsaltSALTsalt",
+    "sa\0lt",
+};
+
+static const uint32_t it_cnt_test_data[MAX_TESTS] =
+{ 1, 2, 4096, 4096, 4096 };
+
+static const uint32_t key_len_test_data[MAX_TESTS] =
+{ 20, 20, 20, 25, 16 };
+
+static const unsigned char result_key_test_data[MAX_TESTS][32] =
+{
+    { 0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71,
+      0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06,
+      0x2f, 0xe0, 0x37, 0xa6 },
+    { 0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c,
+      0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0,
+      0xd8, 0xde, 0x89, 0x57 },
+    { 0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a,
+      0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0,
+      0x65, 0xa4, 0x29, 0xc1 },
+    { 0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b,
+      0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a,
+      0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70,
+      0x38 },
+    { 0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d,
+      0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3 },
+};
+
+int mbedtls_pkcs5_self_test(int verbose)
+{
+    int ret, i;
+    unsigned char key[64];
+
+    for (i = 0; i < MAX_TESTS; i++) {
+        if (verbose != 0) {
+            mbedtls_printf("  PBKDF2 (SHA1) #%d: ", i);
+        }
+
+        ret = mbedtls_pkcs5_pbkdf2_hmac_ext(MBEDTLS_MD_SHA1, password_test_data[i],
+                                            plen_test_data[i], salt_test_data[i],
+                                            slen_test_data[i], it_cnt_test_data[i],
+                                            key_len_test_data[i], key);
+        if (ret != 0 ||
+            memcmp(result_key_test_data[i], key, key_len_test_data[i]) != 0) {
+            if (verbose != 0) {
+                mbedtls_printf("failed\n");
+            }
+
+            ret = 1;
+            goto exit;
+        }
+
+        if (verbose != 0) {
+            mbedtls_printf("passed\n");
+        }
+    }
+
+    if (verbose != 0) {
+        mbedtls_printf("\n");
+    }
+
+exit:
+    return ret;
+}
+#endif /* MBEDTLS_MD_CAN_SHA1 */
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#endif /* MBEDTLS_PKCS5_C */