diff --git a/arch/arm/src/lpc43xx/lpc43_aes.c b/arch/arm/src/lpc43xx/lpc43_aes.c
index 1957cb6941..04c71ea083 100644
--- a/arch/arm/src/lpc43xx/lpc43_aes.c
+++ b/arch/arm/src/lpc43xx/lpc43_aes.c
@@ -161,8 +161,8 @@ static int aes_update(const void *out,
  * Public Functions
  ****************************************************************************/
 
-int aes_cypher(void *out, const void *in, uint32_t size, const void *iv,
-               const void *key, uint32_t keysize, int mode, int encrypt)
+int aes_cypher(void *out, const void *in, size_t size, const void *iv,
+               const void *key, size_t keysize, int mode, int encrypt)
 {
   unsigned int ret = 0;
   uint32_t outl = size;
diff --git a/arch/arm/src/sam34/sam_aes.c b/arch/arm/src/sam34/sam_aes.c
index 9a8b170048..ac63145c2c 100644
--- a/arch/arm/src/sam34/sam_aes.c
+++ b/arch/arm/src/sam34/sam_aes.c
@@ -175,8 +175,8 @@ static int samaes_initialize(void)
   return OK;
 }
 
-int aes_cypher(void *out, const void *in, uint32_t size,
-               const void *iv, const void *key, uint32_t keysize,
+int aes_cypher(void *out, const void *in, size_t size,
+               const void *iv, const void *key, size_t keysize,
                int mode, int encrypt)
 {
   int ret = OK;
diff --git a/arch/arm/src/stm32/stm32_aes.c b/arch/arm/src/stm32/stm32_aes.c
index 851f213eaf..c88d8d8558 100644
--- a/arch/arm/src/stm32/stm32_aes.c
+++ b/arch/arm/src/stm32/stm32_aes.c
@@ -257,8 +257,8 @@ int stm32_aesuninitialize(void)
   return OK;
 }
 
-int aes_cypher(void *out, const void *in, uint32_t size,
-               const void *iv, const void *key, uint32_t keysize,
+int aes_cypher(void *out, const void *in, size_t size,
+               const void *iv, const void *key, size_t keysize,
                int mode, int encrypt)
 {
   int ret = OK;
diff --git a/arch/arm/src/stm32f0l0g0/stm32_aes.c b/arch/arm/src/stm32f0l0g0/stm32_aes.c
index 5b02e6553e..a711788ba6 100644
--- a/arch/arm/src/stm32f0l0g0/stm32_aes.c
+++ b/arch/arm/src/stm32f0l0g0/stm32_aes.c
@@ -257,8 +257,8 @@ int stm32_aesuninitialize(void)
   return OK;
 }
 
-int aes_cypher(void *out, const void *in, uint32_t size,
-               const void *iv, const void *key, uint32_t keysize,
+int aes_cypher(void *out, const void *in, size_t size,
+               const void *iv, const void *key, size_t keysize,
                int mode, int encrypt)
 {
   int ret = OK;
diff --git a/arch/risc-v/src/esp32c3/esp32c3_aes.c b/arch/risc-v/src/esp32c3/esp32c3_aes.c
index 699a6e854d..74558066b2 100644
--- a/arch/risc-v/src/esp32c3/esp32c3_aes.c
+++ b/arch/risc-v/src/esp32c3/esp32c3_aes.c
@@ -587,8 +587,8 @@ int esp32c3_aes_init(void)
 
 #ifdef CONFIG_CRYPTO_AES
 
-int aes_cypher(void *out, const void *in, uint32_t size,
-               const void *iv, const void *key, uint32_t keysize,
+int aes_cypher(void *out, const void *in, size_t size,
+               const void *iv, const void *key, size_t keysize,
                int mode, int encrypt)
 {
   int ret;
diff --git a/arch/xtensa/src/esp32/esp32_aes.c b/arch/xtensa/src/esp32/esp32_aes.c
index eec72c54de..3c644c7e29 100644
--- a/arch/xtensa/src/esp32/esp32_aes.c
+++ b/arch/xtensa/src/esp32/esp32_aes.c
@@ -580,8 +580,8 @@ int esp32_aes_init(void)
 
 #ifdef CONFIG_CRYPTO_AES
 
-int aes_cypher(void *out, const void *in, uint32_t size,
-               const void *iv, const void *key, uint32_t keysize,
+int aes_cypher(void *out, const void *in, size_t size,
+               const void *iv, const void *key, size_t keysize,
                int mode, int encrypt)
 {
   int ret;
diff --git a/include/nuttx/crypto/crypto.h b/include/nuttx/crypto/crypto.h
index e13a91c623..29becbf97d 100644
--- a/include/nuttx/crypto/crypto.h
+++ b/include/nuttx/crypto/crypto.h
@@ -73,8 +73,8 @@ extern "C"
 int up_cryptoinitialize(void);
 
 #if defined(CONFIG_CRYPTO_AES)
-int aes_cypher(FAR void *out, FAR const void *in, uint32_t size,
-               FAR const void *iv, FAR const void *key, uint32_t keysize,
+int aes_cypher(FAR void *out, FAR const void *in, size_t size,
+               FAR const void *iv, FAR const void *key, size_t keysize,
                int mode, int encrypt);
 #endif