mbed TLS Library
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Outline
#include "common.h"
#include "mbedtls/pem.h"
#include "mbedtls/base64.h"
#include "mbedtls/des.h"
#include "mbedtls/aes.h"
#include "mbedtls/md5.h"
#include "mbedtls/cipher.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include <string.h>
#include "mbedtls/platform.h"
mbedtls_pem_init(mbedtls_pem_context *)
pem_get_iv(const unsigned char *, unsigned char *, size_t)
pem_pbkdf1(unsigned char *, size_t, unsigned char *, const unsigned char *, size_t)
pem_aes_decrypt(unsigned char *, unsigned int, unsigned char *, size_t, const unsigned char *, size_t)
mbedtls_pem_read_buffer(mbedtls_pem_context *, const char *, const char *, const unsigned char *, const unsigned char *, size_t, size_t *)
mbedtls_pem_free(mbedtls_pem_context *)
Files
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SourceVuRaspberry Pi Pico SDK and Examplesmbed TLS Librarylibrary/pem.c
 
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/* * Privacy Enhanced Mail (PEM) decoding * * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later *//* ... */ #include "common.h" #if defined(MBEDTLS_PEM_PARSE_C) || defined(MBEDTLS_PEM_WRITE_C) #include "mbedtls/pem.h" #include "mbedtls/base64.h" #include "mbedtls/des.h" #include "mbedtls/aes.h" #include "mbedtls/md5.h" #include "mbedtls/cipher.h" #include "mbedtls/platform_util.h" #include "mbedtls/error.h" #include <string.h> #include "mbedtls/platform.h" 10 includes #if defined(MBEDTLS_PEM_PARSE_C) void mbedtls_pem_init(mbedtls_pem_context *ctx) { memset(ctx, 0, sizeof(mbedtls_pem_context)); }{ ... } #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \ (defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C)) /* * Read a 16-byte hex string and convert it to binary *//* ... */ static int pem_get_iv(const unsigned char *s, unsigned char *iv, size_t iv_len) { size_t i, j, k; memset(iv, 0, iv_len); for (i = 0; i < iv_len * 2; i++, s++) { if (*s >= '0' && *s <= '9') { j = *s - '0'; }if (*s >= '0' && *s <= '9') { ... } else if (*s >= 'A' && *s <= 'F') { j = *s - '7'; }else if (*s >= 'A' && *s <= 'F') { ... } else if (*s >= 'a' && *s <= 'f') { j = *s - 'W'; }else if (*s >= 'a' && *s <= 'f') { ... } else { return MBEDTLS_ERR_PEM_INVALID_ENC_IV; }else { ... } k = ((i & 1) != 0) ? j : j << 4; iv[i >> 1] = (unsigned char) (iv[i >> 1] | k); }for (i = 0; i < iv_len * 2; i++, s++) { ... } return 0; }{ ... } static int pem_pbkdf1(unsigned char *key, size_t keylen, unsigned char *iv, const unsigned char *pwd, size_t pwdlen) { mbedtls_md5_context md5_ctx; unsigned char md5sum[16]; size_t use_len; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_md5_init(&md5_ctx); /* * key[ 0..15] = MD5(pwd || IV) *//* ... */ if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0) { goto exit; }if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0) { ... } if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0) { goto exit; }if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0) { ... } if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0) { goto exit; }if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0) { ... } if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0) { goto exit; }if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0) { ... } if (keylen <= 16) { memcpy(key, md5sum, keylen); goto exit; }if (keylen <= 16) { ... } memcpy(key, md5sum, 16); /* * key[16..23] = MD5(key[ 0..15] || pwd || IV]) *//* ... */ if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0) { goto exit; }if ((ret = mbedtls_md5_starts_ret(&md5_ctx)) != 0) { ... } if ((ret = mbedtls_md5_update_ret(&md5_ctx, md5sum, 16)) != 0) { goto exit; }if ((ret = mbedtls_md5_update_ret(&md5_ctx, md5sum, 16)) != 0) { ... } if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0) { goto exit; }if ((ret = mbedtls_md5_update_ret(&md5_ctx, pwd, pwdlen)) != 0) { ... } if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0) { goto exit; }if ((ret = mbedtls_md5_update_ret(&md5_ctx, iv, 8)) != 0) { ... } if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0) { goto exit; }if ((ret = mbedtls_md5_finish_ret(&md5_ctx, md5sum)) != 0) { ... } use_len = 16; if (keylen < 32) { use_len = keylen - 16; }if (keylen < 32) { ... } memcpy(key + 16, md5sum, use_len); exit: mbedtls_md5_free(&md5_ctx); mbedtls_platform_zeroize(md5sum, 16); return ret; }{ ... } #if defined(MBEDTLS_DES_C) /* * Decrypt with DES-CBC, using PBKDF1 for key derivation *//* ... */ static int pem_des_decrypt(unsigned char des_iv[8], unsigned char *buf, size_t buflen, const unsigned char *pwd, size_t pwdlen) { mbedtls_des_context des_ctx; unsigned char des_key[8]; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_des_init(&des_ctx); if ((ret = pem_pbkdf1(des_key, 8, des_iv, pwd, pwdlen)) != 0) { goto exit; }if ((ret = pem_pbkdf1(des_key, 8, des_iv, pwd, pwdlen)) != 0) { ... } if ((ret = mbedtls_des_setkey_dec(&des_ctx, des_key)) != 0) { goto exit; }if ((ret = mbedtls_des_setkey_dec(&des_ctx, des_key)) != 0) { ... } ret = mbedtls_des_crypt_cbc(&des_ctx, MBEDTLS_DES_DECRYPT, buflen, des_iv, buf, buf); exit: mbedtls_des_free(&des_ctx); mbedtls_platform_zeroize(des_key, 8); return ret; }pem_des_decrypt (unsigned char des_iv[8], unsigned char *buf, size_t buflen, const unsigned char *pwd, size_t pwdlen) { ... } /* * Decrypt with 3DES-CBC, using PBKDF1 for key derivation *//* ... */ static int pem_des3_decrypt(unsigned char des3_iv[8], unsigned char *buf, size_t buflen, const unsigned char *pwd, size_t pwdlen) { mbedtls_des3_context des3_ctx; unsigned char des3_key[24]; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_des3_init(&des3_ctx); if ((ret = pem_pbkdf1(des3_key, 24, des3_iv, pwd, pwdlen)) != 0) { goto exit; }if ((ret = pem_pbkdf1(des3_key, 24, des3_iv, pwd, pwdlen)) != 0) { ... } if ((ret = mbedtls_des3_set3key_dec(&des3_ctx, des3_key)) != 0) { goto exit; }if ((ret = mbedtls_des3_set3key_dec(&des3_ctx, des3_key)) != 0) { ... } ret = mbedtls_des3_crypt_cbc(&des3_ctx, MBEDTLS_DES_DECRYPT, buflen, des3_iv, buf, buf); exit: mbedtls_des3_free(&des3_ctx); mbedtls_platform_zeroize(des3_key, 24); return ret; }pem_des3_decrypt (unsigned char des3_iv[8], unsigned char *buf, size_t buflen, const unsigned char *pwd, size_t pwdlen) { ... } /* ... */#endif /* MBEDTLS_DES_C */ #if defined(MBEDTLS_AES_C) /* * Decrypt with AES-XXX-CBC, using PBKDF1 for key derivation *//* ... */ static int pem_aes_decrypt(unsigned char aes_iv[16], unsigned int keylen, unsigned char *buf, size_t buflen, const unsigned char *pwd, size_t pwdlen) { mbedtls_aes_context aes_ctx; unsigned char aes_key[32]; int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; mbedtls_aes_init(&aes_ctx); if ((ret = pem_pbkdf1(aes_key, keylen, aes_iv, pwd, pwdlen)) != 0) { goto exit; }if ((ret = pem_pbkdf1(aes_key, keylen, aes_iv, pwd, pwdlen)) != 0) { ... } if ((ret = mbedtls_aes_setkey_dec(&aes_ctx, aes_key, keylen * 8)) != 0) { goto exit; }if ((ret = mbedtls_aes_setkey_dec(&aes_ctx, aes_key, keylen * 8)) != 0) { ... } ret = mbedtls_aes_crypt_cbc(&aes_ctx, MBEDTLS_AES_DECRYPT, buflen, aes_iv, buf, buf); exit: mbedtls_aes_free(&aes_ctx); mbedtls_platform_zeroize(aes_key, keylen); return ret; }{ ... } #endif/* ... */ /* MBEDTLS_AES_C */ /* ... */ #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) *//* ... */ int mbedtls_pem_read_buffer(mbedtls_pem_context *ctx, const char *header, const char *footer, const unsigned char *data, const unsigned char *pwd, size_t pwdlen, size_t *use_len) { int ret, enc; size_t len; unsigned char *buf; const unsigned char *s1, *s2, *end; #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \ (defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C)) unsigned char pem_iv[16]; mbedtls_cipher_type_t enc_alg = MBEDTLS_CIPHER_NONE;/* ... */ #else ((void) pwd); ((void) pwdlen);/* ... */ #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) *//* ... */ if (ctx == NULL) { return MBEDTLS_ERR_PEM_BAD_INPUT_DATA; }if (ctx == NULL) { ... } s1 = (unsigned char *) strstr((const char *) data, header); if (s1 == NULL) { return MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; }if (s1 == NULL) { ... } s2 = (unsigned char *) strstr((const char *) data, footer); if (s2 == NULL || s2 <= s1) { return MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; }if (s2 == NULL || s2 <= s1) { ... } s1 += strlen(header); if (*s1 == ' ') { s1++; }if (*s1 == ' ') { ... } if (*s1 == '\r') { s1++; }if (*s1 == '\r') { ... } if (*s1 == '\n') { s1++; }if (*s1 == '\n') { ... } else { return MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT; }else { ... } end = s2; end += strlen(footer); if (*end == ' ') { end++; }if (*end == ' ') { ... } if (*end == '\r') { end++; }if (*end == '\r') { ... } if (*end == '\n') { end++; }if (*end == '\n') { ... } *use_len = end - data; enc = 0; if (s2 - s1 >= 22 && memcmp(s1, "Proc-Type: 4,ENCRYPTED", 22) == 0) { #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \ (defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C)) enc++; s1 += 22; if (*s1 == '\r') { s1++; }if (*s1 == '\r') { ... } if (*s1 == '\n') { s1++; }if (*s1 == '\n') { ... } else { return MBEDTLS_ERR_PEM_INVALID_DATA; }else { ... } #if defined(MBEDTLS_DES_C) if (s2 - s1 >= 23 && memcmp(s1, "DEK-Info: DES-EDE3-CBC,", 23) == 0) { enc_alg = MBEDTLS_CIPHER_DES_EDE3_CBC; s1 += 23; if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0) { return MBEDTLS_ERR_PEM_INVALID_ENC_IV; }if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0) { ... } s1 += 16; }if (s2 - s1 >= 23 && memcmp(s1, "DEK-Info: DES-EDE3-CBC,", 23) == 0) { ... } else if (s2 - s1 >= 18 && memcmp(s1, "DEK-Info: DES-CBC,", 18) == 0) { enc_alg = MBEDTLS_CIPHER_DES_CBC; s1 += 18; if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0) { return MBEDTLS_ERR_PEM_INVALID_ENC_IV; }if (s2 - s1 < 16 || pem_get_iv(s1, pem_iv, 8) != 0) { ... } s1 += 16; }else if (s2 - s1 >= 18 && memcmp(s1, "DEK-Info: DES-CBC,", 18) == 0) { ... } /* ... */#endif /* MBEDTLS_DES_C */ #if defined(MBEDTLS_AES_C) if (s2 - s1 >= 14 && memcmp(s1, "DEK-Info: AES-", 14) == 0) { if (s2 - s1 < 22) { return MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG; }if (s2 - s1 < 22) { ... } else if (memcmp(s1, "DEK-Info: AES-128-CBC,", 22) == 0) { enc_alg = MBEDTLS_CIPHER_AES_128_CBC; }else if (memcmp(s1, "DEK-Info: AES-128-CBC,", 22) == 0) { ... } else if (memcmp(s1, "DEK-Info: AES-192-CBC,", 22) == 0) { enc_alg = MBEDTLS_CIPHER_AES_192_CBC; }else if (memcmp(s1, "DEK-Info: AES-192-CBC,", 22) == 0) { ... } else if (memcmp(s1, "DEK-Info: AES-256-CBC,", 22) == 0) { enc_alg = MBEDTLS_CIPHER_AES_256_CBC; }else if (memcmp(s1, "DEK-Info: AES-256-CBC,", 22) == 0) { ... } else { return MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG; }else { ... } s1 += 22; if (s2 - s1 < 32 || pem_get_iv(s1, pem_iv, 16) != 0) { return MBEDTLS_ERR_PEM_INVALID_ENC_IV; }if (s2 - s1 < 32 || pem_get_iv(s1, pem_iv, 16) != 0) { ... } s1 += 32; }if (s2 - s1 >= 14 && memcmp(s1, "DEK-Info: AES-", 14) == 0) { ... } /* ... */#endif /* MBEDTLS_AES_C */ if (enc_alg == MBEDTLS_CIPHER_NONE) { return MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG; }if (enc_alg == MBEDTLS_CIPHER_NONE) { ... } if (*s1 == '\r') { s1++; }if (*s1 == '\r') { ... } if (*s1 == '\n') { s1++; }if (*s1 == '\n') { ... } else { return MBEDTLS_ERR_PEM_INVALID_DATA; }else { ... } /* ... */#else return MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE; #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) *//* ... */ }if (s2 - s1 >= 22 && memcmp(s1, "Proc-Type: 4,ENCRYPTED", 22) == 0) { ... } if (s1 >= s2) { return MBEDTLS_ERR_PEM_INVALID_DATA; }if (s1 >= s2) { ... } ret = mbedtls_base64_decode(NULL, 0, &len, s1, s2 - s1); if (ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER) { return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PEM_INVALID_DATA, ret); }if (ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER) { ... } if ((buf = mbedtls_calloc(1, len)) == NULL) { return MBEDTLS_ERR_PEM_ALLOC_FAILED; }if ((buf = mbedtls_calloc(1, len)) == NULL) { ... } if ((ret = mbedtls_base64_decode(buf, len, &len, s1, s2 - s1)) != 0) { mbedtls_platform_zeroize(buf, len); mbedtls_free(buf); return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PEM_INVALID_DATA, ret); }if ((ret = mbedtls_base64_decode(buf, len, &len, s1, s2 - s1)) != 0) { ... } if (enc != 0) { #if defined(MBEDTLS_MD5_C) && defined(MBEDTLS_CIPHER_MODE_CBC) && \ (defined(MBEDTLS_DES_C) || defined(MBEDTLS_AES_C)) if (pwd == NULL) { mbedtls_platform_zeroize(buf, len); mbedtls_free(buf); return MBEDTLS_ERR_PEM_PASSWORD_REQUIRED; }if (pwd == NULL) { ... } ret = 0; #if defined(MBEDTLS_DES_C) if (enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC) { ret = pem_des3_decrypt(pem_iv, buf, len, pwd, pwdlen); }if (enc_alg == MBEDTLS_CIPHER_DES_EDE3_CBC) { ... } else if (enc_alg == MBEDTLS_CIPHER_DES_CBC) { ret = pem_des_decrypt(pem_iv, buf, len, pwd, pwdlen); }else if (enc_alg == MBEDTLS_CIPHER_DES_CBC) { ... } /* ... */#endif /* MBEDTLS_DES_C */ #if defined(MBEDTLS_AES_C) if (enc_alg == MBEDTLS_CIPHER_AES_128_CBC) { ret = pem_aes_decrypt(pem_iv, 16, buf, len, pwd, pwdlen); }if (enc_alg == MBEDTLS_CIPHER_AES_128_CBC) { ... } else if (enc_alg == MBEDTLS_CIPHER_AES_192_CBC) { ret = pem_aes_decrypt(pem_iv, 24, buf, len, pwd, pwdlen); }else if (enc_alg == MBEDTLS_CIPHER_AES_192_CBC) { ... } else if (enc_alg == MBEDTLS_CIPHER_AES_256_CBC) { ret = pem_aes_decrypt(pem_iv, 32, buf, len, pwd, pwdlen); }else if (enc_alg == MBEDTLS_CIPHER_AES_256_CBC) { ... } /* ... */#endif /* MBEDTLS_AES_C */ if (ret != 0) { mbedtls_free(buf); return ret; }if (ret != 0) { ... } /* * The result will be ASN.1 starting with a SEQUENCE tag, with 1 to 3 * length bytes (allow 4 to be sure) in all known use cases. * * Use that as a heuristic to try to detect password mismatches. *//* ... */ if (len <= 2 || buf[0] != 0x30 || buf[1] > 0x83) { mbedtls_platform_zeroize(buf, len); mbedtls_free(buf); return MBEDTLS_ERR_PEM_PASSWORD_MISMATCH; }if (len <= 2 || buf[0] != 0x30 || buf[1] > 0x83) { ... } /* ... */#else mbedtls_platform_zeroize(buf, len); mbedtls_free(buf); return MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE;/* ... */ #endif /* MBEDTLS_MD5_C && MBEDTLS_CIPHER_MODE_CBC && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) *//* ... */ }if (enc != 0) { ... } ctx->buf = buf; ctx->buflen = len; return 0; }{ ... } void mbedtls_pem_free(mbedtls_pem_context *ctx) { if (ctx->buf != NULL) { mbedtls_platform_zeroize(ctx->buf, ctx->buflen); mbedtls_free(ctx->buf); }if (ctx->buf != NULL) { ... } mbedtls_free(ctx->info); mbedtls_platform_zeroize(ctx, sizeof(mbedtls_pem_context)); }{ ... } #endif/* ... */ /* MBEDTLS_PEM_PARSE_C */ #if defined(MBEDTLS_PEM_WRITE_C) int mbedtls_pem_write_buffer(const char *header, const char *footer, const unsigned char *der_data, size_t der_len, unsigned char *buf, size_t buf_len, size_t *olen) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; unsigned char *encode_buf = NULL, *c, *p = buf; size_t len = 0, use_len, add_len = 0; mbedtls_base64_encode(NULL, 0, &use_len, der_data, der_len); add_len = strlen(header) + strlen(footer) + (use_len / 64) + 1; if (use_len + add_len > buf_len) { *olen = use_len + add_len; return MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL; }if (use_len + add_len > buf_len) { ... } if (use_len != 0 && ((encode_buf = mbedtls_calloc(1, use_len)) == NULL)) { return MBEDTLS_ERR_PEM_ALLOC_FAILED; }if (use_len != 0 && ((encode_buf = mbedtls_calloc(1, use_len)) == NULL)) { ... } if ((ret = mbedtls_base64_encode(encode_buf, use_len, &use_len, der_data, der_len)) != 0) { mbedtls_free(encode_buf); return ret; }if ((ret = mbedtls_base64_encode(encode_buf, use_len, &use_len, der_data, der_len)) != 0) { ... } memcpy(p, header, strlen(header)); p += strlen(header); c = encode_buf; while (use_len) { len = (use_len > 64) ? 64 : use_len; memcpy(p, c, len); use_len -= len; p += len; c += len; *p++ = '\n'; }while (use_len) { ... } memcpy(p, footer, strlen(footer)); p += strlen(footer); *p++ = '\0'; *olen = p - buf; /* Clean any remaining data previously written to the buffer */ memset(buf + *olen, 0, buf_len - *olen); mbedtls_free(encode_buf); return 0; }mbedtls_pem_write_buffer (const char *header, const char *footer, const unsigned char *der_data, size_t der_len, unsigned char *buf, size_t buf_len, size_t *olen) { ... } /* ... */#endif /* MBEDTLS_PEM_WRITE_C *//* ... */ #endif /* MBEDTLS_PEM_PARSE_C || MBEDTLS_PEM_WRITE_C */
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