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Update getting_started.md

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Guy Wild 2019-09-04 09:56:51 +03:00
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docs/getting_started.md
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@ -190,11 +190,11 @@ Mbed Crypto supports encrypting and decrypting messages using various symmetric
1. Allocate an operation (`psa_cipher_operation_t`) structure to pass to the cipher functions.
1. Initialize the operation structure to zero or to `PSA_CIPHER_OPERATION_INIT`.
1. Call `psa_cipher_encrypt_setup()` to specify the algorithm and the key to be used.
1. Call either `psa_cipher_generate_iv()` or `psa_cipher_set_iv()` to generate or set the initialization vector (IV). We recommended calling `psa_cipher_generate_iv()`, unless you require a specific IV value.
1. Call either `psa_cipher_generate_iv()` or `psa_cipher_set_iv()` to generate or set the initialization vector (IV). We recommend calling `psa_cipher_generate_iv()`, unless you require a specific IV value.
1. Call `psa_cipher_update()` one or more times, passing the whole message or a fragment of the message on each call.
1. Call `psa_cipher_finish()` to end the operation and output the encrypted message.
This example shows how to encrypt data using an Advanced Encryption Standard (AES) key in Cipher Block Chaining (CBC) mode with no padding (assuming all prerequisites have been fulfilled):
This example shows how to encrypt data using an AES (Advanced Encryption Standard) key in CBC (Cipher Block Chaining)) mode with no padding (assuming all prerequisites have been fulfilled):
```c
enum {
block_size = PSA_BLOCK_CIPHER_BLOCK_SIZE(PSA_KEY_TYPE_AES),
@ -548,7 +548,7 @@ information about which inputs to pass when, and when you can obtain which outpu
(for example `PSA_ALG_HKDF(PSA_ALG_SHA_256)`).
**To derive a new AES-CTR 128-bit encryption key into a given key slot using HKDF
with a given key, salt and information:**
with a given key, salt and `info`:**
1. Set up the key derivation context using the `psa_key_derivation_setup()`
function, specifying the derivation algorithm `PSA_ALG_HKDF(PSA_ALG_SHA_256)`.
@ -563,7 +563,7 @@ function, specifying the derivation algorithm `PSA_ALG_HKDF(PSA_ALG_SHA_256)`.
1. Clean up the key derivation context.
At this point, the derived key slot holds a new 128-bit AES-CTR encryption key
derived from the key, salt and information provided:
derived from the key, salt and `info` provided:
```C
psa_status_t status;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
@ -828,9 +828,7 @@ Mbed Crypto provides a simple way to generate a key or key pair.
**To generate an ECDSA key:**
1. Set the desired key attributes for key generation by calling
`psa_set_key_algorithm()` with the chosen ECDSA algorithm (such as
`PSA_ALG_DETERMINISTIC_ECDSA(PSA_ALG_SHA_256)`). Do not set
`PSA_KEY_USAGE_EXPORT`; we only want to export the public key, not the key
pair (or private key).
`PSA_ALG_DETERMINISTIC_ECDSA(PSA_ALG_SHA_256)`). You only want to export the public key, not the key pair (or private key); therefore, do not set `PSA_KEY_USAGE_EXPORT`.
1. Generate a key by calling `psa_generate_key()`.
1. Export the generated public key by calling `psa_export_public_key()`:
```C
@ -884,4 +882,4 @@ Mbed Crypto provides a simple way to generate a key or key pair.
### More about the Mbed Crypto API
For more information about PSA Crypto, download the *PSA Cryptography API* PDF under [PSA APIs](https://developer.arm.com/architectures/security-architectures/platform-security-architecture#implement).
For more information about the PSA Crypto API, please see the [PSA Cryptography API Specification](https://armmbed.github.io/mbed-crypto/html/index.html).